tune notch duplexer A Band Reject duplexer is commonly referred to as a notch duplexer. We were able to tune these very quickly and easily using the new Chinese KC901H network analyser (more about that in another post). For the recieve leg, you want to notch the transmit frequency and for MODEL WP-639 is a 4-cavity BpBr Circuit® duplexer designed for use notch at the reject frequency. celwave Duplexer #633-6a 450mhz50 470 Mhz tuned on frecuencies 447. or Best Offer. You can also scale. RFI have experienced engineering services that can objectively evaluate the requirement and, where possible, offer a technically competent and cost effective solution. This discussion Connecting each notch filter to a common point with another quarterwave cable yields a cross-notch duplexer. This problem occurs because of cavity filter for notch part need adjustment at tuning coil and cavity size. Band reject filters bandstop filters notch filters are tuned circuits that prevent the passage of signals filter is normalized to a nbsp Therefore this paper describes the coaxial resonator cavity duplexer based on Duplexers. Discussion in 'Ham Equipment' started by archjeb, May 5, 2014. Your video fixed that! After watching your video I was able to re-tune a little notch duplexer set for a UHF repeater and I also FINALLY got my 900 MHz duplexer tuned up for my new 900 MHz repeater! After watching your video, it was a snap! Thanks so much! Some repeater owners attempt to tune their duplexers using the simple method of hooking a couple of radios to their duplexer, using one to transmit and one to receive, and simply tuning for the highest s-meter reading on the receiver for the pass frequency and the lowest s-meter reading for the notch frequency. Thanks to the excellent work of WB5WPA, it is possible to create a useable duplexer capable of handling a high power 500khz split six meter repeater. . Four 6. All you are doing now is adjusting for either a peak or a dip. Figure 4&n MANUAL TUNING(4) R-7. The transmitter side of the duplexer is tuned to the receiver frequency, which it notches out. The duplexer was fixed and retuned to a new channel, 1600, not 600 kHz split, partly to move the RX further from a Pager TX. It features low insertion loss, high symmetrical isolation and excellent stability - all in a small and robust package. 5 MHz min. The Jiesai duplexer is a six cavity design rated to handle up to 50 watts. Operating EMR 65316-0/MC(5G) 440-470 MHz 4. BNC/f conns. The duplexer exhibits an isolation from Tx to Rx of greater than 60dB. 00. 82 transmitter frequency. C $810. and a HT. Ironically, these same filt A duplexer is an electronic device that allows bi-directional (duplex) communication over a single path. General Overview. Got as close as I could and shocker no … Low-cost duplexer for 6m, 2m or 70cm. 00 + $395. There are multiple methods so I will give one procedure. I always find that tuning duplexers just by looking at a tracking generator (or a VNA if you will) gets you in the ball park but is never quite close enough, no matter how sharp your dips will display. GM300 is Ch 2 is 462. TUNING Vari-Notch duplexers are originally pre-tuned at the factory to the customers specification. N/female conn. Both the Tx and Rx sides of Jan 12, 2021 · 4 and 6 cavity UHF and 70 cm duplexers. In short, excessive heat buildup in the capacitor will cause the cavity and the duplexer set to fall below designed performance specifications. 550. EMR Corp ensures only the highest quality radio frequency products leave our facility, and has been designing, supporting and manufacturing high frequency radio equipment for over 34 years. Adding pass-reject cavities to one or both branches of a band pass duplexer to notch out a bothersome transmit frequency that is close to the receiver branch  Adjust the duplexer main tuning plunger for maximum RL (return loss). 83 dB. To the left of the trace is the band pass and to the right the frequency notch. 021. I see tons of these and similar mobile notch duplexers for sale. Sep 22, 2013 · The notch is controled by the length of the connecting coax to each cavity. The transmitter side of the duplexer is tuned to the receiver frequency, which it notches out. 5 dB loss. THE SOLUTION A remotely tunable filter solution is now available!With PCBMotor’s precision motor technology, your filters can be produced, deployed and (re-) adjusted faster than ever – both in the factory and remotely in the field – offering: Mar 20, 2012 · Any physical vibration of the duplexer would make it act up violently, with noise bursts as high as 40 to 50 dB! I had also noticed other changes in the duplexer. 5 dB loss. Although not obvious from the picture, they are mounted in the ceiling, laying on their sides. The center frequency, the pass band, and the stop band are each tunable to meet system requirements. 95. - 132-174 MHz Pass Notch Duplexer - Q2220E SINCLAIR 132-174 MHz Duplexer. Tuning a Duplexer. Jan 24, 2012 · Just tune the two screw for each path onto the desired frequency. DB Products vhf Duplexer SP-3506 8 Cavity Notch Duplexer-high Isolation. 350W. The two receiver cavities are exactly the same except that they have their pass band tuned to 144. 2020-05-29 Telewave TPRD-1556 VHF Duplexer, S/N: 23378 Tune and test duplexer. sep. The double notch occurs because the notch tuning on the two cavities don’t match. 550 and 467. General. Then the individual cavities are re-connected and each channel is fine tuned to peak it's overall response. Cavity filters are the basic circuitry behind a Duplexer and are sharply tuned resonant circuit that allow only certain frequencies to pass. SYSTEMS. I figured my numbers as. Jun 19, 2019 · Larger cavities generally have a better efficiency - ie: less loss through the duplexer for equivalent isolation achieved. gen. Frequency Range: 144-155 | 150-165 | 160-174 MHz. This duplexer will reduce the amount of RF energy from the transmitter passing into the receiver by around 180dB and vice versa, but it does not prevent RF energy, at other frequencies, from entering either the transmitter or receiver. N/female conn. Notch (reject) type. INC. On the low side of the duplexer I get a great notch at 467. 550 and 467. TM. Physically a cavity filter is a resonator inside a conducting “box” with coupling loops at the input and output, as follows: Aug 07, 2020 · Tuning the other side of the duplexer is of course the reverse, procedure permitting the transmission of the higher frequency and notching out the 430. The duplexers options vary from band pass to psuedo-band pass to notch frequency responses and product range. The typical performance is shown below. edu is a platform for academics to share research papers. 67 MHz by 40 dB, yet 53. Model #28-37-06C, Frequency Band 144-174 MHz . if i put the notches way A Duplexer is a 3-port device most commonly used to allow including Vari-notch, Bandpass, and -free high conductivity silver-plated tuning probe, and hardened duplexers are frequently used in radio repeater systems. At this point, to tune you'd just adjust the duplexer until the notch was where you wanted it, then repeat for the second output. Mar 20, 2020 · I recently acquired a Decibel Products duplexer, model DB-4072. The band pass is wider than the reject notch so after first tuning band pass, then tuning reject, you could fine tune the reject with the pass knobs. BpBr Circuit® duplexer should be tuned. Excellent tuning stability is therefore maintained across the guaranteed extended temperature range. . Adjust the trimmers on the RX side of the duplexer to minimum power when you transmit with the radio. The rejection notch is  With their independently tuneable pass and notch frequencies, these duplexers are easy to tune in the field over a broad frequency range. The following scans were obatined from my HP8920A service monitor. May 23, 2020 · The double notch on the right is supposed to be a single notch tuned to the 146. Hopefully, the readings can serve as your reference. It really depends upon whether the duplexer is a pass only or a pass notch. EMR CORPORATION's 65544/SNC/440–470 440 – 512 MHz 4 cavity pass notch duplexer. 7" l Notch attenuation: 86 dB (at rcv freq) l Insertion loss: 2 dB View the EESOF Touchstone Circuit file Mar 01, 2021 · The Retevis RT97 is an exciting new UHF repeater certified by the FCC for use on GMRS! The Retevis RT97 has FCC ID 2ASNSRT97. A calibration circuit TXRX 100W Mobile Style UHF Duplexer. notch so that it is on the TX frequency, but on this part a notch curve is not appear. Connect the receive side of the duplexer to your service monitor using the cable you intend to use on the repeater. Working when removed from service. 1. In radar and radio communications There are two predominant types of duplexer in use - "notch duplexers", which exhibit 2019年8月8日 TC Electronic 《TCエレクトロニック》 POLYTUNE 3 Mini ※国内正規品TC Electronicの定番チューナー、Polytuneシリーズに新たなモデルが登場です。「 TC Electronic Polytune 3 Mini」。ミニサイズポリチューンの第3世代  2017年9月7日 ヒップショット・フィクスドは、チューン・マティックよりも弦高を低く設定 できるため、ネックの仕込み角をボディ・トップと平行にして、ボディと弦との 間隔をなるべく狭くしたいギタリストに最適なブリッジと言える。. When it was tuned on our original 145. 550 it cant be that fare off what can I do to use it . Just make sure you aren't fully open or tightened on the notch cap or else you cannot fine tune the notch later. This one is tuned for 152,5 and 157, 5MHz - in this case the repeater transmit and receive frequencies. $1,655. coupled cavities with rotatable coupling loops to optimize VSWR (Return Loss) without removal or replacement of the loops. TX RX Systems indicates the pass band will be 15 dB or more. I found that approximately 0. The duplexer is tunable within the operating frequency range. If you are not using it at a repeater site, maybe for a garage repeater, a $150 six-cavity notch-only duplexer works great. The duplexer has 2 cans for high frequency and 2 for low frequency for excellent rejection on both sides. $795. Construction isn't terribly hard, and neither is tuning. The notch can be placed either above or below the resonant frequency of the cavity, as needed. Typically, this model is small [see adjacient photo], with low insertion loss, and the isolation is typically 70 or 80 dB. 3 PL Ch 8 is 467. Duplexer assembly being put through final tuning and performance testing and verification. The loop also couples energy into the cavity at the desired coupling factor, producing a relatively broad pass band selectivity. Author admin Posted on November 20, 2017 November 20, 2017 Categories Repair Services , Tuning Services , Uncategorized Tags Duplexer , Florida , repair , service , tuning Hi, So I made a post here a few weeks back about tuning my duplexer with just a sig. 5 – 10 MHz separation. Features compact size, low loss and temperature compensation over the range of -40ºC to +60ºC. The receiver side tuned to notch out the transmitt cavity duplexer, and to do so as simply and as non-technically as possible. This video shows how to tune a notch-type duplexer using a spectrum analyzer with a tracking generator, as well as with a vector network analyzer (VNA). The duplexer is tunable within the operating frequency range. 3. Calibrate the NANOvna as usual. 00 shipping. Get the best deals on duplexer when you shop the TX RX Systems 4 Cavity Vari Notch Duplexer 28-37-06C 144-174MHz VHF 50W UHF 6 Cavity Duplexer N Connector Get the best deals on vhf duplexer when you shop the largest TUNING Service Wacom TXRX, etc Free shipping. 6 db pass loss yielded about a 40 db notch at 1. Tracking generator is the easiest way to go about it. SIX-RESONATOR NOTCH DUPLEXER 50W 154 – 174 MHz T06210215. Pre-Owned. RFI have experienced engineering services that can objectively evaluate the requirement and, where possible, offer a technically competent and cost effective solution. 002 W (2mW) There are units that have greater rejection, The one I use has 60dB this 0. When tuning the duplexer, you will want to adjust each loop individually to set the insertion loss. Notch depth is variable from 15-25 dB. org for any questions or to schedule an Inspection 3 Nov 2017 This video shows how to tune a notch-type duplexer using a spectrum analyzer with a tracking generator, as well as with a vector network  Series Notch Duplexer. com. General. Please note that what Dan builds for sale differs physically from what is shown here but electrically is identical. Academia. 25 Meter / 220 MHz Band There are a lot of Wacom VHF duplexers available on the surplus market, but, unless they were built originally for 2M, they likely have the wrong notch stub geometry to work correctly in the 2M ham band. Prepare the tools: * three-port network analyzer * 30W dummy load with N male connector * 2 x RF cable from duplexer to the network analyzer (From N Female to N/M/BNC connector base on your network analyzer connector type ) * slotted screwdriver * spanner 2. Switch the wattmeter and load and set the radio to the RX frequency and transmit with the radio and adjust the TX side to minimum power. Archived. Extruded aluminum cavities and solid- shield copper-jacketed inter-cabling that ensures excellent mechanical and electrical stability. Four cavity. Refurbished. 1. N Female connector. Adjust the duplexer main tuning plunger for maximum RL (return loss). UHF and 70cm / 440 MHz Service includes documentation of final tuning & performance Typical turnaround time: 2 business days (but not guaranteed) $89. This notch level wou Duplexers. Pass- Notch type. May 28, 2020 · $100 - UHF mobile duplexer (notch filter) via eBay, some will tune it as well $100 - UHF antenna I cut/tuned to my TX freq $??? - LDF4-50A coax Plus, some N patch cables between the repeater and duplexer, and another from the duplexer to the LDF4-50A coax as it is rather rigid. 5 and 446. *tessco or field tune Learn More. *TESSCO or field tune Below is a comprehensive list of downloadable instructional manuals to help tune and understand your products. Most are about $1900 new. A tunable duplexer using voltage-controlled varactors is presented. If you need your bandpass / band reject / cavity notch duplexer tuned, please do not hesitate to contact us or call 888-684-6248. To re- tune the duplexer, each resonant cavity must be separated from the group and adjusted individu- ally. Featuring 8 GMRS repeater channels, 5W of output power, and a built-in notch duplexer, all you need to do is add an antenna and feedline to get on the air. 550 how hard would it be to put on 462. 4625 MHz. Our vector network analyzer and signal generator are calibrated semi-annually to NIST traceable standards with calibration certificates provided at time of duplexer tuning. 22 Sep 2013 First most of the small duplexers are a Pass/ Notch type. Plus the Chinese are selling knock offs on e-bay, without any discussion other than the seller offering to tune to your frequencies. $195. TUNING Vari-Notch duplexers are originally pre-tuned at the factory to the customers specification. 6750 it was to be on 462. The resonators are constructed from extruded hardened aluminium that is not easily deformed. 25 Meter Duplexers. 01. series-resonant, notch/bandpass duplexer. Bottom: The rack containing the 70cm and 6 meter repeaters. 2) Terminate the TX port with a 50ohm terminator. 1. Lower cost "notch" style duplexers are usually limited to 65 to 75 dB of isolation between transmit & receive. 015. 16 I have used some of the 8 cavity notch duplexers for on-site repeaters running at 10 watts or less, and I've found them to be a good option. 6 MHz separation. The Duplexer in Fig 2 shows a rejection figure of 40 dB, using the same power level of 20 Watts, the unwanted frequency power is attenuated to 0. The following scans were obatined from my HP8920A service monitor. ICOM IASDUP1035. After tuning the cavity resonance on each side you would adjust the notch with the capacitors, tuning for as deep a notch as posible. TUNE COST IS $75. Get info of suppliers, manufacturers, exporters, traders of Duplexer for buying in fabricate UHF Notch Duplexer, we use extremely advanced technologies and  Duplexers. 11. Jan 07, 2020 · These capacitors are used in the duplexer cavities to tune the rejection notch; therefore, if the capacitance changes, the notch tuning changes. For complete information of the T-1500 Series Cavities and Duplexers, NOTE: The change in tuning of both the pass and the notch on a cavity after adding the  You tune the notch cavities to the freq of the other freq to keep it out of each other, passing everything else. You can tune a notch type duplexer with only a signal generator and some type of RF signal meter but it is a pain in the rear. Mar 21, 2015 · Jiesai Duplexer SGQ-450 N Connectors. TX/RX 144-174 MHz Vari-Notch Duplexer. This was due to the pressure of the finger stock on the tuning plunger. Aug 05, 2010 · Tuning Instructions Number 025791 Rev: 1 Date: August 5, 2010 "FP", "FR", "FQ" Series Bandpass Filters Description The tuning instructions described on the following pages apply to all 7, 8. 2 dB insertion loss, 150 W, N Female connector TESSCO tune. This video shows how to tune a notch-type duplexer using a spectrum analyzer with a tracking generator, as well as with a vect 23 Dec 2012 Due to the needed high Q of the notch filters, the tuning elements, and often the entire resonance chamber, are silver plated to reduce resistive loss. What's got me stumped is that there are also 3 additional slugs on the connection end that I can't figure out. > > Any UHF duplexer experts out there? > > I connected a spectrum analyzer input to the receive port of my duplexer > > (around 449 MHz). VHF Duplexer 1501-C6 utilize six high-Q notch-type coaxial resonators with 1”-cross-section that results in small geometry advantages without compromising duplex isolation. Sinclair Technologies Inc. Tuning across the notch is critical because it is narrow. The analyses and tuning of these circuits are a skilled task that requires highly accurate RF measurement equipment in the hands of a skilled professional. A wide range of duplexer options are available, ranging from compact notch duplexers for mobile applications, larger cavity duplexers in various configurations and sizes to compact milled aluminum duplexers supporting medium a The level of experience and expertise required to accurately tune coupled- resonator cavity filters, cross-coupled filters, and duplexers effectively precludes these devices from mass produc- tion at high speed. *TESSCO tune Notch Filter; Tubular Filter; Suspended Substrate Stripline Filter; Duplexer; Fixed Attenuator (Coaxial) Manual Attenuator (Coaxial) RF Load (Coaxial) Mis-Matched Termination; Single Directional Coupler; Dual Directional Coupler; 90°,180°,SMD Hybrid; Circulator (Coaxial/Drop-In) Isolator (Coaxial/Drop-In) Coaxial to Coaxial Adapter; Power DB Products vhf Duplexer SP-3506 8 Cavity Notch Duplexer-high Isolation. 300 Mhz Single Cavity Notch - 222. Like notch the transmit freq out of the receive chain  I have begun to construct the second generation 6 Meter Duplexer based upon the This duplexer will have a more solid construction and should be easier to tune. duplexers consist of 3 or 4” square Res-Lok. The duplexers options vary from band pass to psuedo-band pass to notch frequency responses and product range. TX RX Systems 4 Cavity Vari Notch R8000 Duplexer Tuning Application Note Page 3 of 6 An overview of testing a Duplexer using the R8000 is as follows: RF power from the Generator side of the R8000 is applied to one port of the Duplexer filter element or RF path under test. Generically, filter of this kind is known as notch filters. rotatable, typical notch depths from 10 to 45 dB may be secured with most TEM1 mode cavities. On more expensive duplexers there is another adjustment, a variable capacitor near the coax end of each cavity. Range (MHz) 440-512 MHz $1,499. 445 Mhz and receive on 154. The major objective of this project is to develop the band pass duplexer system for frequency range 130 - 170 MHz VHF . The S27-XX-06 is a Series Notch style duplexer which offers notch isolation characteristics at the  A Band Reject duplexer is commonly referred to as a notch duplexer. Jan 02, 2007 · For tuning the notch of the duplexer you adjust it's length by moving it in and out of the center conductor of the heliax and solder it where when the notch is tuned. Vari-Notch® provides a low-loss pseudo-bandpass characteristic that can exist very close to a deep notch. Jun 01, 2012 · For duplexer cavities, we want a very high Q, because the distance between a cavity’s notch and passband is very small (only 1 MHz in our case). The loop has a series capacitor, which is adjustable to resonate the loop itself, providing a reject notch when adjusted to a desired frequency. 00 + $395. Posted by 1 year ago. Excellent tuning stability is therefore maintained across the guaranteed extended temperature range. Vari-Notch duplexers are But I struggled with NOTCH duplexers, I just couldn't figure it out. 625" diameter cavities) Tuning Procedure. Note: Please inspect items prior to placing a bid. 010 Your local Two Way Radio dealer can tune this duplexer to your systems needs. If you need your bandpass / band reject / cavity notch duplexer tuned, please do not hesitate to contact us or call 888-684-6248. Each cavity filter is only a 50 Ohm device at the pass frequency. Nov 06, 2017 · I have a duplexer that was tune 467. Tune and test duplexer, with more in-depth Smith Chart impedance testing and testing under transmitter power. These are all in the "Receive" side of the duplexer. 5 SINCLAIR's MR456B-1-1 806 – 960 MHz mobile duplexer. 18/jul/2015 - Mobile Duplexer tuned on a HP-8920A 80db notch. Pass- Notch type. pdf May 2018, their 1/4 wave inter cavity cables are not correct!! And, neither are the line lengths to the antenna Tee. C Series Multicouplers CM-221 R-312 R-313 R-314 R-401 EXCAL 121T-B FP Series FP,FR,FQ Series F-Series Hybrid Ring Duplexer Rx Multicouplers MR Mobile Duplexers P and Q Series May 12, 2019 · Set the radio to the TX frequency and connect to the duplexers antenna connector. Set the service monitor for the transmit frequency. It is very similar to a bandpass/ band reject type duplexer in operation and tuning. Diplexer for Car Radio 0 - 108 MHz and Mobile Telephone bands with 3 options: The notch filter resonators can also be Sinclair Technologies Inc. 5:1. Re-calibrate the vna from  A duplexer is an electronic device that allows bi-directional (duplex) communication over a In the simplest arrangement, the switch consists of a gas -discharge tube There are two predominant types of duplexer in use - "notch 9 Jul 2019 The above plot is that of a notch duplexer. It comes with “N” connectors which is great considering that SO-239 connectors are horrible for UHF. You tune the notch cavities to the freq of the other freq to keep it out of each other, passing everything else. High Pass Pass - 224. Many other models are available with customised tx-rx frequency Sep 26, 2016 · The duplexer is a typical mobile device available on eBay for about A$100 delivered, taking a week or so to Australia. Read honest and unbiased product reviews from our users. Tuning of the filter requires adjustment of the pass band and the rejection notch. Seller 99. Qorvo's duplexer portfolio includes surface acoustic wave (SAW), bulk acoustic wave (BAW) and advanced  7 Aug 2020 The tuning of Duplexers and cavities filters is not an experience to be The spectrum analyser with some sketches of successful notch filtering. Applicable to Filters, Duplexers, or Multicouplers  tuning it is no problem compared to a normal notch duplexer and seems good at first but if you move or even tap it the tuning is completely lost (notch moves  A Duplexer, preselector or similar tuned circuit is a critical part in any RF provided); Notch depth data at the reject bands; Markers verify your exact frequency. Their tuning screws are replaced to given them a lower frequency range. The resonators are constructed from extruded hardened aluminium that is not easily deformed. (if present). At the time of this writing, I have built three such duplexers and they do indeed work 'as advertised'. 95 shipping. $795. Is there any physical or Apr 23, 2012 · The first avenue I explored was building a notch duplexer using scraps of 1-7/8″ rigid copper coax, pieces that I saved when our analog TV transmitter was removed. Jan 19, 2015 · A pass-notch/pass-reject duplexer (usually referred to as cavity duplexers) has the same notch between the input and output frequencies, but it notches a much larger range of frequencies and only passes the 30 or so kHz of bandwidth needed for the two signals to make it through. The sides are where you will  A wide variety of duplexers to suit your needs: Vari-notch (pseudo-bandpass), - free high conductivity silver-plated tuning probe, and hardened aluminum outer. After assembly and before final tuning all of the tabs on the desired notch frequency and tune -2 for minimum indication of RF on theC scope. The threaded tuning shaft generally shifts the frequencies of the pass band peak and the reject notch simultaneously. 0. ) Jan 07, 2020 · If the notch tuning changes, the pass/reject performance of the cavity changes. 350 W. This approach appealed to me at first because I thought it would be possible to build it using only a hacksaw and drill press, and very few additional parts (read: cheap!). Inc. New Listing 50W VHF 6 Cavity Duplexer N Connector FREE tune radio repeat New 136-180Mhz New. 3 – 10 MHz spacing. Note that each cavity has only one coupling loop. I've also seen a great variation in the tuning ability of different Chinese suppliers for their duplexers. Notch depth is variable from 15-25 dB. for example instead of 440/445 a The analyser was able to tune each cavity, but the overall response, while good for separation was compromised, possibly by incorrect inter-connecting cable lengths. 550 467. Thus, the band reject filters allow for simultaneous tuning of the band reject This has an obvious advantage, at the notch frequency it is a predictable high Z, making the line to the antenna "T" a 1/2 wave. is adjusted while observing the return loss response and the rejection notch is adjusted by. Tune up. archjeb Active Member. The duplexer operates within specification between ö20 deg and +70 deg C and at the following power levels--5 kwatts PIP and 2. The range of notch characteristics will depend on the relationship between the pass and notch frequencies for a given cavity size and operating band. The resonators are  6 Nov 2017 I've tuned a lot of duplexers over the years. That is how I did it and they worked well. Six cavity. 3. The Monitor side is hooked to the other port. It's the usual layout of 4 notch cavities that seem to tune as I'd expect with rods at the end opposite the input/output connections. (It will also notch frequencies that are extremely close to the frequency to which it is tuned, but most of the time, additional repeaters are on frequencies that do not meet the criteria. I found that approximately 0. Jan 07, 2020 · It is indeed a pleasure to be of service to all of you and to provide you with top-notch repairs, tuning, and customer service. Since Duplexer #2 is going to be 462. This obviously is not what we want happening. They will have a Lo side and a Hi side and Antenna port. This one is tuned for 152,5 and 157,5MHz - in this case the repeater transmit and receive frequencies. It has a voltage gain of 24. 550 TX/RX 141. Modifying 6" VHF cavity filters to 2 metre notch filters It could be that as the center tuning element lengthens pushing the cavity filter lower in frequency. 400 Mhz Steps to tune the frequency 1. Our vector network analyzer and signal generator are calibrated semi-annually to NIST traceable standards with calibration certificates provided at time of duplexer tuning. It is a 6 cavity notch only duplexer. The final step for tuning the notch was to replace the TX signal from the VNWA with a TX signal from a handheld radio tuned to the notch frequency. 02mW) One When tuning the duplexer, you will want to adjust each loop individually to set the insertion loss. 2020-05-29 Celwave 0185417U05 UHF Duplexer, S/N: M152974-009 Tune and test duplexer. If the response curve doesn’t match the Duplex manufacturer’s specification then tuning adjustments are used to align the filter. Band Reject Duplexer. Each cavity filter is only a 50 Ohm device at the pass frequency. Below are the tuning readings of my home UHF repeater system using nanoVNA. Notch (reject) type. 700 Mhz The duplexer with the notch-filtered LNA was fabricated in a 65-nm CMOS process. In a 3 port configuration Find helpful customer reviews and review ratings for Fumei UHF 400-470MHz 30W Duplexer for Radio Repeater with Preseted Low Frequency 462MHz & High Frequency 467MHz & N Female connectors at Amazon. With it you'll find the Br notch at maximum SWR, the Bp peak at minimum SWR. Watch. TX/RX vari-notch VHF duplexer Home duplexer / notch filter tuning. Their notch or Band Reject frequency  8 Apr 2016 hi, im trying to tune a notch duplexer the high side is tuned just fine (the higher frequency notch on the high side of the duplexer right?) the low  21 May 2006 I've done everything I know to try to tune a Phelps-Dodge 6 cavity UHF Notch/ Notch mini duplexer. Jan 03, 2020 · A notch filter duplexer will notch only one frequency, so it is tuned to notch the receiver frequency from the transmitter and the transmit frequency from the receiver. ? Thompson Olorede - September 18, 2019 Nov 19, 2019 · To see the full notch depths in "good" duplexers, it takes a VNA with a >110 dB dynamic range. 4" l Notch attenuation: 80 dB (at xmit freq) l Insertion loss: 1. 50W VHF 6 Cavity Duplexer N Connector FREE tune radio repeat New 136-180Mhz. [email protected] Notch Cavity (Figure 5) – The band-reject cavity filter, or notch filter, is a high Q resonant circuit designed to attenuate a narrow band of frequencies while allowing all other frequencies to pass through with only slight attenuation. TUNE COST IS $75. It notch when adjusted to a desired frequency. 000 Mhz High Pass Notch - 222. The notches are provided by six (6) rectangular resonators. 2. The place to talk about specific amateur radio equipment and all types of accessories, fixes, repairs and modification. TX RX 28-37-81227A VHF Vari Notch Duplexer. R-6X 110 Q – UHF PASS REJECT 6 RESONATORS DUPLEXER 380 – 430 MHz R-7. When reconnecting the assembly, it is A duplexer is a 50 Ohm in out system but at the notch frequencies this no longer applies. VARI-NOTCH FILTER TUNING PROCEDURE. 625in diameter cavities. 00 shipping. hi, im trying to tune a notch duplexer the high side is tuned just fine (the higher frequency notch on the high side of the duplexer right?) the low side on the other and, the cavity on the antenna side of the stack is no problem but the cavity on the low port side is giving me trouble, it acts like a low cut (like 5 mhz wide) when i bring it close to the other notch. Connect the duplexer Rx port on a 50 ohm load. 95 + return shipping and insurance cost; 4-cavity VHF, 2 Meter, and 1. 95 Duplexer Tuning Guide (Easy Guide of how to tune various types of duplexers) This Guide is a great reference for the Two-Way technician in a shop or the Ham tech at home. The Monitor side is hooked to the other port. *Factory tuned The duplexer is currently tuned to transmit on 154. I want to get the notch The above plot is that of a notch duplexer. Band Pass Curve - During tuning section of all the duplexer, the sections of cavity filter for pass band at first not show If too deep or shallow a notch, less than -40 or more than -50dBm, rotate coupling loop slightly and retune pass and adjust notch cap until you find notch maximized at about 45dB on rejection frequency. > pseudo-pass/notch duplexer was ineffective at attenuating the noise. A single BNC connector with an external T is used for the feed line connec-tions. It has a frequency range of 380-485 MHz and a bandwidth of ±500kHz. I can get a GREAT notch. That’s a rough one. If you're buying one that is supposed to be tuned, you better have a way to verify it. Qorvo's duplexer portfolio includes surface acoustic wave (SAW), bulk acoustic wave (BAW) and advanced  1 Jun 2016 A tunable transformer duplexer having two notches has been proposed and demonstrated for a broadband operation. The specification for this duplexer is 80 dB. NanoVNA for tuning notch duplexer. Jun 20, 2011 · Cable lengths between cavity 3 and cavity 6 to "T" are tuned lengths. pass-Notch type. 0. 4 cavity. 550 TX/RX NO PL Ch 6 is 467. 550 RX 141. The analyzer noise floor doesn't show the bottom of the notch very well. I am proposing a conceptual design for a low-cost, home-made duplexer for 6m, 2m, or 70 cm. TUNE UP: Set the notch to your highest frequency to be used and then pull up the tubing 1/16 inch more, then tac-solder the two pieces of tubing together. 02. Cavities covering 132- 960 MHz. Connect the duplexer antenna port on a good 50 ohm load. The pass band. The mobile station 204 is provided at step 702 with new transmit and/or receive frequencies. 5 inch diameter circuit board mounted generates a transmission notch below the bandpass an inductor will set the notch above the bandpass notch tuning interacts somewhat with center frequency the capacitor may be replaced by a series l-c that can give l or c behaviour notch tuning cap (or inductor) output equivalent circuit bandpass tune coupling loop coupling A Duplexer, preselector or similar tuned circuit is a critical part in any RF communications network. VHF / 2-Meter / 1. Note that the connecting jumpers are made of RG-8x coaxial cable and should be approximately one quarter wave in length. 0. Rejection is specified as 70 dB minimum at 500 kHz separation! SINCLAIR TECHNOLOGIES' MR2222B-2-2 150 – 174 MHz mini-duplexer. The changes he made are for producability and Figure 1: Block diagram of a typical four-cavity Vari-Notch Duplexer (6. The TX RX Vari-Notch (c) type Duplexer: The Vari-Notch type duplexer is a very popular, low cost and small size duplexer that is only available from TX RX Systems. While the pass-band cavities will generally tune to the 2M band by winding down the threaded rods, many of these surplus VHF duplexers were built for splits greater than 600 kHz. VHF PASS REJECT DOUBLE CAVITY FILTER DUPLEXER 66 – 88 M Duplexers are tuned at the factory using Vector Network Analyzers (VNA) that have a high dynamic range (hdr) that exceed 120 dB According to the calculations, the transmit cavities need a notch level of 82. I usually pay about $350 for a good Telewave or Sinclair bandpass/band-reject (BPBR) duplexer with 80-90 dB of TX to RX isolation. Table 1 shows the model numbers and electrical specifications of the duplexers covered by this manual. Then the individual cavities are re-connected and each channel is fine tuned to peak it's overall response. 6% positive. Please contact Pam Kitto at 919-249-3371 or pam. 00 TO YOUR FREQ 1HR 1501-C6 VHF Compact Band-Reject Duplexer. So therefore practically speaking, we do not tune up the RX from the duplexer antenna port for best sensitivity or especially best return loss with the TX off, because with the TX off that port is most likely not 50 ohms when tuning, a 50 ohm load is placed on the TX port, then tune. 550 RX NO PL The SM50 will be setup as Ch 1 467. I get GREAT notches but LOUSY loss. Since we install duplexers in our repeaters and sell duplexers as part of our system to note in your video that when using a notch cavity duplexers you can't use rec 24 Apr 2020 Adjust the Tx notch for the desired frequency. Free Tuning Included with Purchase Used TX RX Systems Vari-Notch Duplexer. Get the best deal for vhf duplexer from the TX RX Systems 4 Cavity Vari Notch Duplexer 28-37-06C 144-174MHz VHF 50W VHF 6 Cavity Duplexer N Connector FREE The least expensive is the notch duplexer, which simply notches the transmit frequency from the receiver line and notches the receive frequency from the transmit line. 350W. 5 MHz to keep them happy. Add to Cart. To re-tune the duplexer, each resonant cavity must be separated from the group and adjusted individu-ally. Duplexers aren’t "black magic" You really need only a handful of basic principles to build, modify and tune one from a base of sound knowledge. If the duplexer has not been tuned before for your frequency, you may want to tune each cavity first by disconnecting them, getting it close, and then tune them together. SINCLAIR 132- 174 MHz Duplexer. This auction includes the duplexer and steel cabinet (Tuning not included). Like notch the transmit freq out of the receive chain and notch the receive freq out of the transmit chain. A really > difficult problem to diagnose. At the notch frequency each cavity filter is almost an open circuit and hence no longer presents a 50 Ohm impedance to this frequency. At the notch frequency each cavity filter is almost an open circuit and hence no longer presents a 50 Ohm impedance to this frequency. The repeater uses a notch-type duplexer and a band-pass filter on its receiver. At high-band VHF and UHF, the TX RX Vari-Notch® design is the most commonly used. 550 RX NO PL and is TX 462. If the notch tuning changes, the pass/reject performance of the cavity changes. 550 NO PL. Buy Duplexer Tuning Guide (Easy Guide of how to tune various duplexers VHF UHF) from only $29. In VHF and UHF bands, the Vari-Notch® design is the most commonly used, with a low-loss pseudo-bandpass characteristic that can exist very close to a deep notch. "Good" spectrum analysers with tracking generators could, at least in theory, measure notch depths at or above these ranges. build you a duplexer to the tune of $500 US. This book and how to change this cavity into a notch (Br) cavity later. Tune up. 4. 8 dB, and IIP3 FD of 52. 110 frequency in 1997, it made a scraping noise as the knobs were turned. Connect your Watt meter between the signal output of the band pass cavity and the load (antenna or dummy load) and adjust for maximum RF power. In a 3 port configuration Watch. … to combine filters to perform duplex operation such as band-pass duplexers, band-reject or notch duplexers. These figures are the same for the TX and RX sides of the duplexer. It came with notches at those frequencies, but had not been well tuned. Other models and 536-90 6-Cavity Mobile Duplexer. Description . 4 cavity. In short, excessive heat buildup in the capacitor will cause the cavity and the duplexer set to fall below designed performance specifications. The tunable band reject filter on the receiver side can be tuned to reject the transmit signal frequency, and the tunable band reject filter on the transmitter side can be tuned to reject the receive signal frequency. I also upgraded the repeater N panel connectors to silver. Set a wattmeter to the RX port and a 50 ohm load to the TX port that can tolerate the power from the radio. Single Cavity Pass - 224. The transmitter side is tuned to notch out the receiver frequency. 0dB, and a VSWR of equal to, or less than 1. See tx-rx-instruction-manual-vari-notch-duplexers-with-6-inch-cavities. 4 dBm. All of Dan's units are fabricated using only 1 5/8" Heliax and are Plug and Play (no external tuning required) units. 6750 462. 1. Minimum separation 9,24 and 45 Mhz. For 4" Dia. 6 MHz separation. . TX RX Systems indicates the pass band will be 15 dB or more. Connect the cables Apr 24 #12851. +$13. 5 MHz min. Notch only duplexers are readily available in the used / surplus market and eBay is also a good source. Bandwidth of the pass band can be widened by offsetting each cavity slightly from it's partner. iii) Signal and Troubleshoot. 4 cavity duplexers are more common, with 6 cavity being used for the high power repeater systems. in 70cm band do you need a different duplexer, factory set for negative offset? I cant imagine that your standard cavity and notch duplexers would be able to be tuned in reverse . 625 mhz ham. 4 cavity. N Female connector. Often they are tuned down in the 406 govt band or 470 to 512 t band. 5 dB loss. Joined: Jan 26, 2014 Messages: 80 Likes Notch Duplexer. You can also go to our Video Library page to see video tuning instructions. 550 RX 141. In the amateur radio world I noticed repeaters with negative offsets -5 mhz . On combined Duplex pass-reject filters these adjustments interact with each other. The rejection notch is tuned after the pass notch. New (Other) The final measurements show a 1. 5 db pass loss yielded about a 40 db notch at 1. By measuring the relative amplitude of the RF at the R8000 Duplexer Tuning Application Note Page 3 of 6 An overview of testing a Duplexer using the R8000 is as follows: RF power from the Generator side of the R8000 is applied to one port of the Duplexer filter element or RF path under test. 00 EMR Corporation 64534/ENC 144-190 MHz VHF 4-Cav Pass/Notch Base Duplexer Jul 01, 2020 · Qorvo's family of RF filters includes duplexers, diplexers, triplexers, quadplexers and discrete RF filters, giving designers the flexibility to choose between discrete single-band building blocks and integrated multiband filtering. Feb 01, 2007 · A duplexer for bidirectional communication systems includes tunable band reject filters. 75db insertion loss through the 3 stubs and approximately 73db of notch depth. Mar 21, 2018 · 2m Duplexer design repair tune pager-reject Introduction My local radio club's main 2m duplexer had an intermittent fault. Connect a 50 ohm load to the antenna port. 5, and 10” Bandpass, Notch, and Q circuit filters. Complex multiple pass band and reject designs Compact duplexer, triplexer It is equivalent to a series-tuned circuit. 550/ 467. 6-6 MHz Spacing, Mobile Duplexer 50 Watt, N-Female $399. If the optional  Although a primary building block for duplexers, multicouplers and preselectors, these cavities filters can be used It is equivalent to a series-tuned circuit. The client gets a complete report of the testing, including the network analyzer graphs showing proof of performance. Adjust the low Pass side of the duplexer on the higher frequency for the deepest notch on these two cavities. 00. 400 Mhz Low Pass Pass - 222. Aug 05, 2010 · Tuning Instructions Number 025793 Rev: 1 Date: August 5, 2010 Q-Series Res-LokTM Duplexers. The high Q means that a single cavity can attenuate 52. Rejection per side on these sets is said to exceed 100dBm! The pass tuning is on the front and uses a flathead screwdriver. *Factory Tune to Series Notch Duplexer Tuning Instructions General Overview The S27-XX-06 is a Series Notch style duplexer which offers notch isolation characteristics at the appropriate Tx-Rx split for the specific band. Sinclair Q circuit Res-Lok. Here an MFJ-259, or similar, is easier to use than the simple transceiver method. The best duplexers are made with full size 1/4-wave cavities, but at 1 Two Way Radio - Micro Magic Co. To tune this duplexer, connect the Tx port to the return loss bridge DUT (device under test) Port. 550 141. So I have no intention to write a definitive treatise on duplexers here. This is a trace of the receive and transmit legs of the duplexer. Quite few have this. TM. So you can use it right away in your repeater application! Please specify high and low frequency after you win this item. Inspections are by appointment only. This video goes over the process of tuning a duplexer, make sure you know how Learn how to setup and tune our notch cavity filters, using a TWNC-1505 for  The common assumption is that once a set of duplexers have been tuned and put the pass frequency and the lowest s-meter reading for the notch frequency. Tunable duplexer with common node notch filter KR100975587B1 (en) * 2005-04-08: 2010-08-13: 퀄컴 인코포레이티드: Tunable duplexer with common node notch filter US20060229030A1 (en) * 2005-04-08: 2006-10-12: Simon Harris S: Tunable duplexer with common node notch filter EP1755230A3 (en) * 2005-08-17 Tune the frequency Power on your network analyzer, according the guidance on frequency network, using it to monitor the frequency, adjust the six screw poles on duplexer with slotted screwdriver to the frequency you want. 3 PL Ch 2 467. With their independently tuneable pass and notch frequencies, these duplexers are easy to tune in the field over a broad frequency range. Set your cavity to the opposite frequency you want it to pass and adjust the screw for the deepest notch, this pre-tunes this cavity. 1 Aug 1999 Notch cavities have one coaxial connection to remove energy at the tuned frequency. 6% positive. Big Selection of Digital Radios in Stock (718) 998-6646. Each major graticule division is 10 dB, so the two notches are only about 66 dB down. 2020-05-14 Telewave TPRD-1556 VHF Duplexer, S/N: 23197 Tune and test duplexer desired notch-bandpass characteristic Œ allows notch tuning! series capacitor tuning sensitivity: ~ - 20 % per 100 khz (146 mhz) (reducing c moves the notch up in frequency)! bandpass loss ~ unchanged Œ compared to standard bandpass standard bandpass qu = 5000 q notch_cap = 1000 q loop = 400 response in db notch-bandpass only one Please allow 14-21 Days For Delivery Product Description 440-512 MHz Duplexer Type Pass Notch Freq. As Berkinet mentioned, the higher quality duplexers involve a combination of bandpass and reject technology. Seller 99. 77 the re- ceive frequency. These capacitors are used in the duplexer cavities to tune the rejection notch; therefore, if the capacitance changes, the notch tuning changes. A couple of old cavity resonators were discovered in the back shed. Pass/Reject Duplexer Response Curves Here's what I've been doing: (using the duplex generation function of a Motorola 2001C Station Analyzer in "Spec AN" mode) 1) Inject the TX frequency to the "common" or antenna port". 00 TO YOUR FREQ 1HR TUNING to your desired frequencies is INCLUDED in the sale. I connected the tracking generator output to the antenna > > port of the duplexer. 5 MHz minimum separation 1. 14 watching. I have not built one to this design but it combines ideas from duplexers I have made or from commercial duplexers. 3 PL Ch 4 is 462. 4 dB, TX insertion loss of 3. 5. Jan 07, 2020 · Another 6-cavity 4062-WOC-B set we recently converted, overhauled, and built, reassembled and ready for final tuning and testing. SINCLAIR's Q2220E 132 – 174 MHz duplexer. Notch This duplexer is a compact high performance notch-only style duplexer, ideally suited to installations at uncongested communications sites. The factory tunes every duplexer cavity port to perform properly when Apr 23, 2012 · The first avenue I explored was building a notch duplexer using scraps of 1-7/8″ rigid copper coax, pieces that I saved when our analog TV transmitter was removed. Duplexers: TX RX duplexers provide the transmitter and noise suppression characteristics you need while minimizing the loss to your carriers. With two loads you could also do it with a Return Loss bridge (still a bit of a pain). Pass and notch frequencies must be The car radio is tuned for optimum reception on the MW-band by means of the antenna tuning screw. If the notch tuning changes, the pass/reject performance of the cavity changes. 550 tuned. in NYC will keep you in Touch with your Staff and Family. After entering your required tuning center and choosing your other requirements, you can generate a data sheet with a valid model number, price, mechanical drawings and a summary of all your specifications. 2. Our state-of-the-art RF filters lead the industry for size, performance, cost and time to market. When pre tuning only bend 3 tabs on the lid. BNC Female connectors. From the top down is the 70cm repeater, 6 meter repeater, 70cm duplexer, and power supply for both. This design is by WB3AYW, Leonard Shick. Typical models and electrical specifications are shown for reference only. Put your repeater in transmit and adjust the notch on the receive cans for minimum signal on the service monitor, (best notch). Assuming you mean tune the frequency notch, the way I checked a diplexer with with mine is to set the frequency of interest range, calibrate, hook the input to S11 and the output to S21, set display to logmag S21. FIG. The notch will probably shift and become 2 notches. The store insisted I supply some tuning data, even though I was immediately going to change it. Jun 18, 2019 · negative offset repeater -dupolexer tuning - posted in Technical Discussion: Point of curiosity . 6-Cavity Duplexer for the 160 MHz Band This duplexer is delivered in a low band version type DPF 2/6 L, tunable within 138 - 156 MHz and a high band version type Tx-Noise Suppression on Rx-Frequency, Single-channel tuned: > 80 Fix or calculate L. The notch filter can be considered the opposite of the band pass filter. Adjust the High Pass side of the duplexer on the lower frequency side for the deepest notch on these two cavities. As Alan said don’t forget to terminate with 50 ohms dummy load the unused port during tuning. Tuning a Motorola T1500 Duplexer with an IFR FM/AM 1200S Service MonitorNote: Subsequent to publishing this video, I discovered the cabling is wrong, and the NanoVNA for tuning notch duplexer. The power dividing ratio, r, between the Tx path and Rx path in with tuning capability two notch duplexer&n 8 Dec 2020 Tuning Range 4 - 6 GHz is recognized by top-tier defense contractors and wireless infrastructure providers as a world leader in the design and manufacture of RF and microwave filters, duplexers, and integrated assemblie When I asked an amateur radio buddy how he tuned his repeater duplexer, he responded, `By signal strength. Tuning Instructions. The receiver port is tuned to the transmitter frequency, which it notches out. 7 dB l Xmt Leg stub length: 44. Close. This approach appealed to me at first because I thought it would be possible to build it using only a hacksaw and drill press, and very few additional parts (read: cheap!). 67 MHz escapes virtually unscathed. A duplexer is a 50 Ohm in out system but at the notch frequencies this no longer applies. Here is a list of our Standard Manually Tunable Band Reject / Notch Filters in cavity design, with guaranteed specifications and prices. Written for the layman and using bare minimum equipment that the home tech should have on their bench! Check A Duplexer is a 3-port device most commonly used to including Vari-notch, Bandpass, and -free high conductivity silver-plated tuning probe, and hardened With their independently tuneable pass and notch frequencies, these duplexers are easy to tune in the field over a broad frequency range. 550, at somewhere around -80 db, and great insertion loss numbers. Each of the four cavities is tuned with a 1. 3 PL and TX is 462. I specified 440. The issue arises when this gimic cap moves around inside the center conductor from mechanical movement, such as transporting it to the repeater site. herein are universal to duplexer construction, modification and tuning. 2 dB from the antenna to the LNA output with 28-dB notch filtering, cascaded noise figure of 6. Repeat for each When tuning a duplexer, it is not necessary to make graphs as we did during the design phase of the cavities. Special cavity types are used for such Methods of Tuning Cavity Resonators - According to Application This is a Pass/Notch(BpBr) set as you can see the tuning screws on the top of both sides of the 4-cavity duplexer. sep. Notch type Duplexers are usually 3mhz or better frequency split for optimum operation. This design, shown in Figure 2, uses only one loop and a series capacitor to adjust the notch frequency above or below the passband. Duplexers are tuned at the factory using Vector Network Analyzers (VNA) that have a high dynamic range (hdr) that exceed 120 dB and cost $40 K to $60 K. 6 is a flow diagram of one embodiment of a method for tuning a duplexer 600 using a common node notch filter in a mobile station. - 132-174 MHz Pass Notch Duplexer. We won’t be able to avoid some simple mathematics. Aug 15, 2014 · Homebrew cavity resonator/duplexer for 2m repeater There has been some interest in the club establishing another 2m repeater, but lacked a duplexer. 00002 W (0. 5 kwatts PEP Aug 13, 2015 · The duplexer is band pass with reject notch filters. I am tuning this for a gmrs repeater I put together with the frequencies 462. 3) Tune the RX side cans to notch out the TX freq. The duplexers I have modified for 23cm are ex 1500MHz units. Once the tuning is complete the a throughput test can be performed, 19. Apr 03, 2008 · Top: The four bandpass cavities (and notch stubs) that make up the repeaters duplexer. 11. 1 One-Half MHz split Duplexer Specs,€ 3 stubs/leg,€ 1 5/8" Heliax stubs l Rcv Leg stub length: 44. Duplexer MICRO-4201-C6 utilize six high-Q notch-type coaxial resonators with 1”-cross-section that results in small geometry advantages without compromising duplex isolation. Most duplexers found in land mobile wireless service are pass-reject or pass/notch types, shown schematically in Figure 3. The insertion loss is equal to, or less than 1. Northcomm Technologies has both the experience and the alignment facility to precisely tune, align, and verify these critical communications components. This instruction manual (part# 7-9176-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers constructed from 4” diameter cavities. Tuning the duplexer The duplexer is a band-pass type, with six cavities, three each for RX and TX with a "T" combiner. I cannot tune damaged duplexers due to input power above rated spec being fed, physical damage, burned up tuning capacitors, etc. *Specify frequency needed or field tune** Tuning Method Specify frequency or Field Tune Frequency Range 132-174 MHz Minimum Separation 0. tune notch duplexer