Duplexer tuning procedure

06 MB PDF file. But, lot's of guys on here have. A TX/RX Systems Vari-Notch duplexer is used in this video. It is not recommended that you try this yourself with Model WP-678. The center tuning may have changed as well. Silver plating the movable brass tuning probes and hardened copper contact fingers avoids erratic tuning, high loss, and degraded selectivity which result in extra time and costs. In UHF, that would include UTAC41-43. They are usually tuned by adjusting each cavity, in combination with the recommended length of each connecting cable - which must be precise. 000. I hoping that at least one will respond to you privately and you guys can set up a schedule. Calibrate the NANOvna as usual. May 27, 2003 · If you do a lot of duplexer tuning, get a real network analyzer. The duplexer doesn't. This procedure can be used as a guideline for measuring and tuning other filter elements or an entire RF path in a Duplexer configuration. com. This process is typically carried out using specialized equipment such as a network Sep 21, 2017 · These have been the workhorse for tuning duplexers for many years. Non-Broadcast Transmitter Exhibit D Users Manual per 2 1033 c3 details for FCC ID ABZ89FC3773-D made by Motorola Solutions, Inc. PASS-REJECT DUPLEXER TUNING PROCEDURE tracking-generator. Micheal, You can only use the return loss bridge method for adjusting the pass portion of a BpBr duplexer or cavity. This will then display the pass characteristic of the duplexer. 700 MHz radios do not require duplexer tuning and duplexers should not be tuned in the 900 MHz It really depends upon whether the duplexer is a pass only or a pass notch. SLR 8000 Programming and Tuning 10. Finger stock looks good. ). Three models, each with a tuning range of approximately 25 Jul 19, 2023 · The 6-cavity Res-Lok duplexer offers a 1 MHz pass band and a reject notch for a 5 MHz frequency separation. Chapter 1 – The Mysterious Duplexer. Vari-Notch® duplexers are used to provide simulta-neous operation of a transmitter and receiver (or two transmitters) which are at different frequencies while connected to a common antenna. I've been pleasantly surprised the last few times I've tuned one and I couldn't improve it any further tuning as a complete unit. 95 + return shipping and insurance cost; 4-cavity VHF, 2 Meter, and 1. Apr 13, 2013 · Well, I'm not sure this is the correct procedure, but when I was making 902-928Mhz solid cavity duplexers, I put a reflection coefficient bridge on the input (no network analyzer available) and swept for lowest return loss and best looking sweep. Refer to Figures 1 and 2 when performing these procedures for connections and tuning This short video illustrates an important tip to remember when tuning the center frequency of a cavity type bandpass filter, often used as part of a duplexer These duplexers are frequently used in ra-dio repeater systems. The signals on inputs 1 and 2 occupy different frequency bands. To summarize: Tune the band pass adjustments 4/20/03 #29486. Tune the band pass adjustment of the high frequency cavity of the duplexer while observing the limiter reading of 13. You will need either a built in tracking generator or an external one. Finger stock cavities of the duplexer while observing the limiter read-ing of receiver #2. Duplexers UHF and Tetra Duplexer Q3330E Series Electrical Specifications Frequency Range MHz 450 to 470 Connectors N-Female Input VSWR (max) 1. connectors closest to you, or down towards the table, the LEFT side goes to the receiver (usually the higher. tenna. See full list on wa7arc. Key the transmitter and adjust the power adjustment control on the transmitter to approximately 80 percent of the desired Dec 11, 2020 · A diplexer is a passive device that combines two inputs into a common output. After re-capping them, they are once again working like new. First the pass band for both channels and then the rejection notches. Low power opera- tion of 2 Watts is also available (Dealer programmable). txt) or read online for free. This is because when you move the pass band the reject moves along with it. Chuck WB2EDV On 9/30/2012 2:24 PM, Bob - AF6D wrote: No I didn't. Depending upon the duplexer model being tuned, locate the low and high frequency cavities in Figure 2 or 3. Notice that there are four combinations. • Six-cavity provides 85 dB isolation • Res-Lok design reduces inter-cavity cabling and losses • Provides up to 85 dB isolation at frequency separation of 500 KHz. Bird® Technologies Group combines the industry leading brands of both Bird Electronic and TX RX Systems and is a global, innovative supplier of RF products, systems, services and educational solutions. bird-technologies. The duplexer is now tuned. Connect the source port (ch0) to the antenna of the duplexer and the detector port (ch1) to either the receiver or transmitter port of the duplexer. org Nov 6, 2017 · Since we install duplexers in our repeaters and sell duplexers as part of our system packages, I often get asked about them. html Steven from Buy Two Way Radios demonstrates how to properly tune a GMRS duplexer with the Rigol DSA815. This is the basic tuning procedure used for design and in the field, for individual cavities and complete duplexers. 1 This procedure does not address trimming tuning stub type duplexer although this method can be used for the band pass adjustment. It should be noted here that the tracking generator is also tuning with power but it is a very low power. ) 5. 30303 Aurora Rd. Duplexers UHF and Tetra Duplexer Q3330E Series Q3330E-3 Also referred as: Q3330E*3 Duplexer, Q-Circuit, Res-Lok, 6 cavity, rack mount, 450-470 MHz • Six cavity Res-Lok duplexer • Provide 1 MHz passband and reject notch where frequency separation is 5 MHz • Typical minimum isolation of 85 dB with maximum insertion loss of 1. Jan 9, 2019 · The Bp cavities are adjacent to the antenna input. Ex: 450. This instruction manual (part# 7-9176-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers con­ structed from 4" diameter cavities. (Turn the tuning screw clockwise to decrease the resonant frequency of the cavity. FIELD TUNING INSTRUCTIONS FOR 4-CAVITY BpBr CIRCUIT DUPLEXER HIGHLIGHTS (1) The duplexer is factory-tuned to the exact frequencies appearing on the decal with use of a spectrum analyzer/tracking generator and no further tuning or "touching up" is required. You can also buy duplexers from Tessco, and have them tuned before delivery for a fee. It is also known as a cross band combiner. The duplexer may have one or more damaged notch tuning capacitors. 6 Tx Audio Level Set: Tuning Procedure 10. 00. Then the output from the TG is connected to the input of the duplexer, the output of the duplexer is connected to the input of the spectrum analyzer. To rough tune, use the s21 measurement. 14. Exciting action - screen shots. PASS-REJECT DUPLEXER TUNING PROCEDURE<br />. 25 Meter / 220 MHz Band Tuning a TXRX cavity with tracking generator / spectrum analyzer and return loss bridge. Tune the Reject (Notch) Frequency (The reject is an offset from the pass) Star Junc Combiner Tuning: Star Junc Combiner Tuning: This guide provides an overview of Telewave. These duplexers are frequently used in ra­ dio repeater systems. Field Tuning Procedure: The following outlines the steps for field-tuning the DB4030 and DB4032 duplexers. I have a question on tuning notch style duplexers. Disconnect receiver #2 and connect receiver Mar 30, 2021 · On your next 526 try the attenuators on the end of the test cables and tune each can individually. 5: Now connect a receiver that is set to your transmit frequency to your duplexer receiver output and use the sliders on the body of the receiver side duplexer cavities and set dips for your transmit frequency. Sep 11, 2017 · How to tune a duplexer, featuring the Telewave TPRD-1554 Pass/Reject Cavity Duplexer. Multiple adjustments will be required to achieve the best performance. Tune each low pass cavity notching adjustment for a minimum signal into receiver #1. UHF and 70cm / 440 MHz Service includes documentation of final tuning & performance Typical turnaround time: 2 business days (but not guaranteed) $89. IMPORTANT: All cavities are factory tuned to the exact frequency indicated on the label. Adjust first one cavity, then the other, while reducing the signal generator output to prevent receiver limiter satu-ration. Page 27: Duplexer Tuning Guide • In the case of the Tornado duplexer, the Low Noise Amplifier for the Receive path has been integrated onto the duplexer printed circuit board. 4569 :: www. The manual for your sweeper should show the setup & procedure. Our 6. 2. na5rc Nov 28, 2018 Page 1 of 6 Apr 1, 2024 · tuning a duplexer This forum is for discussions regarding System Infrastructure and Related Equipment. Jun 30, 2023 · I'm in the process of building portable repeaters for use on the national interoperability channels. and REJECT-TX. In 700/800/900 MHz bands, where there are large Note: This duplexer was an option for MTR2000, Quantar, and Quantro stations. PASS-REJECT CAVITY AND DUPLEXER TUNING. It consists of four 4” OD copper cavities interconnected with double shielded cable in a bandpass-reject configu-ration. 5% copper solder. Understanding, Maintaining & Re-Tuning Antenna Duplexers A band pass duplexer using six band pass type cavity resonators is shown in schematic form in Figure 1. Despite the disposition of the cavities, the tune-up procedure will be similar. number of other sites. Lock the tuning screw shaft nut after tuning each cavity. repeater-builder. By tuning an RF path the effects of hookup cable length and attached elements can be accommodated for best Duplexer performance. No other tools are needed. frequency), and the RIGHT side goes to the transmitter. Remember you are tuning the duplexer to eliminate power or signal, not pass them. Sep 30, 2012 · an HP and have never done the procedure. width (in) 19. (usually the lower frequency). C Series Multicouplers. is one of the least expensive ways Re: MSR2000 - Duplexer Tuning (and rubber chickens) "wb5nfc" <wb5nfc@> wrote: Yes, that's the procedure I'm following. If you don't have the manual, try BAMA or other internet sites. Connect two pairs to Tee and verify performance. VHF Cavity Duplexers 30-250 MHz A Duplexer is a 3-port device most commonly used to allow a transmitter and receiver, operating on different frequencies, to share a common antenna while operating simultaneously. In fact that's the procedure called out in the Motorola instructions for a 526 series on a Quantar repeater. 15. 5 MHz separation. The basic equipment needed for tuning a notch type duplexer is a spectrum analyzer with a tracking generator, some good double shielded cables and a known good 50 ohm load. Mike the engineer also gives sugges Nov 29, 2012 · 4. One interesting q Apr 13, 2013 · Well, I'm not sure this is the correct procedure, but when I was making 902-928Mhz solid cavity duplexers, I put a reflection coefficient bridge on the input (no network analyzer available) and swept for lowest return loss and best looking sweep. This includes but is not limited to repeaters, base stations, consoles, voters, Voice over IP, system design and implementation, and other related topics. Table 1 shows the model numbers and electrical specifica-tions of the duplexers covered by this manual. Those frequencies range from TX 453. Installation Manuals & Tuning Instructions. Peak and peak again. At least a 100W or larger soldering iron will be required. 4 Base Station/Repeater Tuning Setup 10. The toys can get you close, but most people ignore the RX match to 50 ohms. You’re heard, loud and clear. 3: Move your receiver to the connector previously terminated in step two. Tune the Pass Frequency. One of the problems experienced with the original execution of this duplexer design is that the builders did not provide adequate mechanical support of the tuning rod lock-nut. Below is a comprehensive list of downloadable instructional manuals to help tune and understand your products. 25 Meter Duplexers. 13. The filters that make up the duplexer isolate the transmitter from the receiver by filtering out CHAPTER 10. 000 and the receiver side is tuned to 444. The adjustment for the reject side will move the reject point in relation to the pass band. kHz to 300 GHz, IEEE C95. F-Series Hybrid Ring Duplexer. The cavity set for RX will be PASS-RX<br />. There should be additional dash numbers after "PD-526" that define the. 3 Impedance Ω 50 Average Input Power (max) W 350 Frequency separation (min) MHz 5 Isolation (min) dB 85 Mechanical Here's a complete procedure right here on the group's web site. X182AC is 0185417U04, same as Celwave PD526-WB-SR-1 X182AD is 0185417U05, same as Celwave PD526-4-2 X182AE is 0185417U06, same as Celwave PD526-5-1 X182AF is 0185417U07, same as Celwave PD526-5-2. Consequently, the signals on inputs 1 and 2 can coexist on the output without interfering with each other. The RG-400/U and the RG-141/U are identical uses Teflon dielectric except for the center conductors. Tuning procedure for Mobile Duplexer TFE6030A. I just can't find a respectable notch. What's the procedure on tuning them and what equipment is needed. 2 Customer Programming Software Setup 10. The duplexer is factory tuned to the exact operating frequencies and shipped ready for immediate instab lation. Dec 19, 2019 · Here's a photo showing, from top to bottom, a tape measure, a genuine TXRX Vari-Notch loop for 6 meters, one completed homemade loop, the two original band-pass loops, and a blank loop plate. When you tune a duplexer, did you MUST present a 50 ohm load on ALL 3 ports. io’s Star Junction Combiner Tuning Procedure, as well as instructions on how to tune them with the appropriate equipment. Connect the NANOvna to the duplexer TX port and set the NANAvna to using pop rivets. 1. 4625-453. Here are a few articles that explain the process pretty well. You will need an RF detector probe or preferably a detector such as the HP 423A or 423B crystal detectors. This means that when you adjust the capacitor, the insertion loss will change and the loop position may have to be readjusted. On a typical two-way hilltop, cavity duplexers are as common as the forest of antennas that bristle from the towers. duplexer's specific band and tuning range. 73, Dick http://www. A network analyzer is what is normally required. No further tuning or optimization is necessary. What's got me stumped is that there are also 3 additional slugs on the connection end that I can't figure out. You can often find on-line instructions for the tuning procedure, or contact the manufacturer for assistance. 8625 and RX 458. A “tee” junction and two more cables connects the two branches with the antenna feed line. 3 Using an Allen wrench, loosen the tuning rod locking screws (6). 1 Introduction 10. pdf), Text File (. Select “Start Frequency” and set to the lower end of the test frequency range. Dec 16, 2023 · 12/16/23 #13957. 5:1 Insertion loss (max) Tx to Ant dB 1. 5% tin, 3% silver, and 0. I picked up a UHF mobile duplexer at a hamfest several years ago and now have a project I'd like to use it with. One pair applies to the transmit side, the other to the receive side. That's about all I can do to help. On each cavity, loosen the hex nut that locks the threaded tuning rod. 11621) is available as an optional item. Examine the labels on the top of the duplexer, and locate the TX and RX ports. If you don't get a good match, 20 Db min , then the low level signal will be reflected back out the antenna. If you orient the unit with the notch screws and. 695. Connect the duplexer Rx port on a 50 ohm load. tuned. If the pass or reject frequency must be changed, Telewave recom-mends that the cavity or duplexer be returned to the factory to ensure optimum performance. 4625-458. Add to Cart. Joe Burkleo. The following procedures must be used to tune the duplexer to the transmit and receive operating frequencies. com/ge/duptuning. Since yours is showing excessive loss and bad VSWR, my bet is you left the 3rd port unterminated and didn't use pads on at least the Port to which the radio was connected. I commonly hook my signal generator to the antenna port and send one of the frequencies into the duplexer. The coupling. 7 Modulation Limit Alignment: Tuning Procedure, Verification 12x16x37. These duplexers are frequently used in radio repeater systems. Once all of the individual filters have been tuned, each of the channels as a whole must be fine. 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. Designed for frequency combining, these filters also serve as efficient pre-selectors. The original design showed a bushing from under the lock-nut to the top flange of the cavity which would transfer the locking force directly to the flange. As I vaguely recall, it was 5 sections, with a total of 9 adjustments for tuning and coupling: May 21, 2018 · Pass/Reject duplexers are passive, mechanical devices with no electronic components. Mar 30, 2012 · Thought I would share how I figured out how to tune repeater duplexers -- those things that allow one antenna to both receive and transmit signals simultaneo . One of the options from Motorola for the VHF, UHF and 800/900 MHz Quantar units is an in-cabinet duplexer. Six cavity. The cavity duplexer is a very familiar part of both amateur and commercial two-way radio. Set the R8000 configuration as follows: Press the blue “Instrument” hard key and select “Tracking Generator”. Document Includes User Manual User Manual :. Notch (reject) type. This instruction manual (part# 7-9176-1) covers the installation, tuning, and maintenance of When tuning a Pass/Reject filter, typically you tune the pass band first and then tune the reject. Make sure to watch our video on how to tune the TPRC-1505 prior to viewi NOTE: All tuning adjustments are mutually dependent. Sign In or Register for preferred pricing! $790. One requirement of tuning a duplexer is the ability to set the transmitter reject to about 100 dB down at the receive port; it would be very difficult for a spectrum analyzer to offer such a wide dynamic range. care - it'll handle 350 watts either way. invar. - John AC4JK load impedance (antenna, duplexer, isolator, etc. Table 1 shows the model numbers and electrical specifications of the duplexers covered by this manual. Aug 16, 2000 · In this example the transmit side of the duplexer is tuned to 449. Operating in the 406-512 MHz frequency band, it provides typical minimum isolation of 85 dB at maximum insertion loss of 1. The DRC-200 is a state-of-the-art Desktop Repeater for operation in the Land Mobile UHF (450-470 MHz) fre- quency band. We would like to show you a description here but the site won’t allow us. The term “repeating link” repeater describes a repeater that transmits and receives simultaneously, just like a “drop” repeater, but unlike a “drop” it is an inexpensive method of linking to. Jan 9, 2019 · See Figure 2-5. 3. 3 Reference Oscillator Alignment: Tuning Procedure 10. Getting the most from your repeater system. 16. Of these three types of filter Band Reject and Band Pass/Band Reject are most adjustment of the duplexer's high frequency cavities. Connect the equipment as shown in Figure 3a. at a time, making certain that the between-cavity jumpers are not mixed up; they are carefully selected for each position to result in an optimum match. 1. io’s Power Monitor TPRD-series Duplexer Tuning Instructions 46 kB PDF file Generic tuning instructions for their pass/reject duplexers. R80000 Dec 16, 2019 · 12/15/19 #175575. The TX match will follow the path lose through the devise. You can also go to our Video Library page to see video tuning instructions. Disconnect receiver #2 and connect receiver #1. Click on any photo for a larger view. 5. Select “Stop Frequency” and set to the upper end of the test frequency range. suitable duplexer interconnecting cable kit (No. The duplexer may have been modified by its previous owner. Turn the tuning rod slowly (left/right) till the pass is centered at the target frequency. . 2 dB Yes, that's the procedure I'm following. 625" diameter cavities. Tune for a maximum limiter reading. 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. The detailed tuning procedure for a duplexer Nov 10, 2004 · That was an excellent description for Tuning Duplexers! The only thing I can add to the subject is use high grade double shielded 50 Ohm coaxial cables such as RG-400/U (stranded center conductor), RG-141/U (solid center conductor) or equivalent. There are multiple methods so I will give one procedure. 66Vf cable and the factory way of Jan 12, 2021 · 4 and 6 cavity UHF and 70 cm duplexers. (See Figures 1 and 2) 3. The<br />. Duplexer Tuning/Performance. temperature range (°C) -40 to 60. Most repeaters have one. Figure 2-3 represents two repeaters linked together (two linked repeaters). When I go to tune it though I find that it has some slugs that I don't know the purpose of. Since the Celwave PD526-4-2 is a high-performance duplexer that is usually used in Quantar and MTR2000 repeater installations, I always wonder why MN003286A01-E Chapter 5: GTR 8000 Base Radio Optimization Figure 61: VHF Duplexer Tuning Setup 5. 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. 5 Rx Audio Level Set: Tuning Procedure 10. It's the usual layout of 4 notch cavities that seem to tune as I'd expect with rods at the end UHF Cavity Duplexers 380-512 MHz A Duplexer is a 3-port device most commonly used to allow a transmitter and receiver, operating on different frequencies, to share a common antenna while operating simultaneously. The duplexer may have jumper cables that are incorrect lengths. Rough tuning can be done with the NanoVNA but fine tuning the notches is best done with the actual repeater receiver. Tune each high The notch will probably shift and become 2 notches. As I vaguely recall, it was 5 sections, with a total of 9 adjustments for tuning and coupling: MFG PART #: MR356N-2. 3 Insertion loss (max) Rx to Ant dB 1. Dec 3, 2010 · The proper (and recommended) way to tune the PD-526 duplexer is one cavity. 9/10/16 #158301. These are all in the "Receive" side of the duplexer. Box 1331, Piscattaway, NJ 08855-1331. Connect the equipment as shown in Figure 1. The duplexer must be retuned any time the frequencies change or whenever the unit has been repaired or any module (duplexer, etc. TX RX duplexers provide the transmitter and noise suppression characteristics you need while minimizing the loss to your carriers. No further field tuning or adjustment is normally required. 000 MHz. The repeater operates in the UHF band with a 25 watt (without duplexer connected) RF output. The tuning screw shown in Figure 2-3 is only for fine-tuning. Ad-just first one cavity, then the other, while reducing the sig-nal generator output to prevent receiver limiter satura-tion. Note that each branch has three cavities connected together with cables. 18. The following is a step by step procedure for fine tuning the channels and completes the re-tuning of the duplexer. 1-1991, Publication Sales, 445 Hoes Lane, P. The following outlines the tuning procedure for the Z-Matcher. 4. TPRD-0354, TPRD-0454, and TPRD-0554 Duplexers 143 kB PDF file These are 4 cavity 5 inch low-band pass-reject duplexers good for 350 watts and covering 30-60 in three 10 MHz ranges. 4 cavity duplexers are more common, with 6 cavity being used for the high power repeater systems. 17. tuning rod material. Re: MSR2000 - Duplexer Tuning (and rubber chickens) "wb5nfc" <wb5nfc@> wrote: Yes, that's the procedure I'm following. The filters that make up the duplexer isolate the transmitter from the receiver by filtering out FINE TUNING THE CHANNELS . 6. If TX and RX are not marked, then you must determine which port<br />. Test Procedure. This manual covers internal duplexer tuning for 400 – 470 MHz radios. Tune the signal generator to the desired higher frequency. Tune-up Procedure: Table 6-1 lists the basic rules for tuning a duplexer. FP, FR, FQ Series. 4. (2) To maintain maximum isolation, use double- shieled type cable (RG-142 or RG-214) to Sep 2, 2009 · Part 12 Duplexers 3. N Female connectors. This instruction manual (part# 7-9177-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers con-structed from 6. 2 For each cavity, unscrew and remove trimmer screw dust covers (9). To tune a notch cavity or the notch adjustments on a BpBr cavity or duplexer you do that with just the tracking generator as you normally have been doing. Environmental. Ex: 440. After wrestling with this problem for awhile, someone suggested that there might be an internal problem in the cans, so I drilled out all of the rivets on the end caps. VHF / 2-Meter / 1. Connect the duplexer antenna port on a good 50 ohm load. O. A duplexer is a passive device that allows bi OR you could just go to the RB website and read up or copy the T-1500 series duplexer tuning instructions from the manual on file which tells you how to set the notch loops for your freq offset and has a table that gives you all the factory lengths for each of the four interconnecting cables using RG-142 /. Jan 19, 2024 · Tuning a duplexer to a specific repeater frequency pair involves precise adjustments to the bandpass filters. 1 Setting Up for VHF Duplexer Tuning Procedure: 1 Disconnect the six N-type connectors from each cavity. R8000 Duplexer Tuning With the R8000 - Free download as PDF File (. How do they work? What are they used for? And how are duplexers tuned? To answer these questions, W2AEW, just put out a great video where he answers. Tune whichever port to get the passband FIELD TUNING PROCEDURE 1. The procedure used to tune the duplexer is as follows: Tune individual cavity (Bp & BpBr) Connect pair of cavities and verify performance. No corrosion or arcing. 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. 2 dB when aligned. Nov 27, 2015 · In this how to video, a Sinclair Technologies engineer demonstrates step by step how to properly tune a duplexer filter. Tighten the locking nut, just enough to hold the rod on frequency. Jul 5, 2021 · This video shows how to tune a 1. 10. ) has been replaced. I've assumed that I'll need three duplexers and will have to swap them out depending on which frequency pair I want to use. In this procedure, always use the lowest discernible power. I recommend 96. Lock tuning screw shaft nut after tuning each cavity. Worked for a company that had a dozen of these, and they all started to burn up power capacitors. A. 625" diameter Duplexer cavities have both coarse and fine tuning controls as well as calibrated, easily adjustable loops to speed tuning time. A Hoffman model A-30-24-16LP weather proof door cabinet is offered as an option. *TESSCO tuned or field tuned. An Agilent E5071B series network analyzer was used to tune and measure the duplexer. :: Solon, OH 44139 :: 866. Thanks Chuck! Now I need to find duplexer tuning. Loosen the locking nut on the center tuning shaft. SINCLAIR's MR356N-2 440 – 480 MHz mobile duplexer. 8625. If the graph shows that the cavity is quite a bit off frequency, you will now need to lengthen or shorten the center conductor. The factory tunes every duplexer cavity port to perform properly when 2: Using the plungers, set the passes for each side of the duplexer by terminating the unused side and put your signal source on the antenna connection and a receiver/spectrum analyzer on the unterminated side. MODEL WP-678 is a 4-cavity BpBr Circuit® duplexer designed for use with duplex systems operating at 3 MHz or more separation in the 440-512 MHz band. Each section includes a description, an adjustments procedure, performance specifications, rack mounting informaiton, and a field tuning procedure. Tune the signal generator to the desired lower frequency. 2GHz repeater duplexer using a NanoVNA V2plus4. This typically means using 3 (or 6) dB pads on all ports during tuning. Using a 50-ohm coaxial cable, connect the transmitter to a wattmeter and a load as shown in Figure 1. cavity set for TX will be PASS-TX and REJECT-RX. Power Monitor Calibration: Power Monitor Calibration: This guide provides an overview of Telewave. Finger stock You can use a sweep generator and scope for swept alignment of filters and duplexers. First, keep in mind that a repeater's performance is usually limited by its ability to hear the users, not by its power output. Inside of cans is bright and shiny. Go back and reset your peaks in steps 2 and 3. RX match is VERY important. Minimizing the attenuation of the received signal by improved receiver performance, minimizing feedline loss, optimal duplexer tuning, etc. ro ky mi dh cg md ng mn qf hp