Tx rx duplexer tuning.
The factory label says it was tuned for Tx 148.
Tx rx duplexer tuning While the potential payoff is tantalizing, several challenges must still be solved before EB duplexers can become commercially viable. Disconnect the cavities and run through the reject tuning again of the cavities closest the TX and RX ports. 45 MHz. Table 1 shows the model numbers and electrical specifica- receiver to the duplexer, and are available from TX RX Systems Inc. The 28-37-07A from TX RX Systems is a RF Duplexer with Frequency 144 to 174 MHz, Band 1 144 to 174 MHz, Power 400 W, Insertion Loss 0. 80 dB Temperature range -10 to +50C VSWR 1. min. All Messages By This Member #211531 Merry Christmas to all in the group! I spent hours in the shop last night playing with a set of TX/RX 220mhz duplexer I recently acquired (odd, it has two model numbers listed on the tag - 43-54A-02479-A & 26-54A-02479A), trying to line them up on a 222/223 amateur receiver to the duplexer and are available from TX RX Systems Inc. 38 each and save 2 % Duplexer Tuning? Quantity-+ Add to Cart Add to Quote. ♦ Lower cost to manufacture; savings in materials and labor. receiver to the duplexer, and are available from TX RX Systems Inc. Thus, only a single hardware is necessary to serve all duplex channel combinations of the overall radio frequency band - a prerequisite for large scale low cost unit production. The applied filters consider optimal tailored transfer functions with transmission zeros, realized with The notch will probably shift and become 2 notches. needed) Add to Cart The item has been added. Adjust the trimmers on the RX side of the duplexer to minimum power when you transmit with the radio. The length of the cable is a Set a wattmeter to the RX port and a 50 ohm load to the TX port that can tolerate the power from the radio. The thing that I maybe didn't make clear was that I injected the RX freq into the ANT port, Connected the RX radio to the TX port, and fine tuned it (less than 1/16th of a turn) to notch out the actual repeater's receiver sensitivity. 24 Jan 2014 TUNING DUPLEXERS. TX RX Systems offers a wide variety of Duplexer options to -free high conductivity silver-plated tuning probe, and hardened aluminum outer conductor 4” (102 mm) diameter, 6. RX Br: Min. N Female connector. 5 dB IL for 3 cavities in the chain The Fumei UHF Duplexer is designed for use in two-way radio communication systems operating in the UHF frequency band and it is adjustable within the range of 400-470 MHz, and with the proper tools, you can easily make the necessary tuning adjustments. o Typically, 1 dB IL for 2 cavities in the chain, and 1. Examine the labels on the top of the duplexer, and locate the TX and RX ports. sep A novel Ka-band Rx/Tx channel duplexer1 design with tuning capability is established for the 26GHz band. Connect the duplexer to the Coaxial Cables: Connects equipment for testing and tuning. Four 6. I just made a portable repeater out of It is compatible with other duplexers and repeaters, and is suitable for the 450-470 MHz frequency range. Hello mentors, I am building a duplexer from 4 10"x26" TX/RX cavities that were removed from a commercial site. Frequency Range: Set the frequency sweep range on the VNA to cover the duplexer’s operational band (including TX and RX passbands and stopbands). Completely disconnect one cavity at a time from the duplexer by removing its normal inter-cavity The "static" balancing net- work is tuned to maximize the duplexer isolation at t = 0 and is then not updated. Decibel Products DB4032-8A (30. Measure the direct Tx Power out of the Transmitter. 25”. Rough tune the rejection notch. Repeaters running more than about 40 watts commonly require higher pass/reject specs than the typical four-cavity duplexer can provide at the narrow 600 KHz Tx/Rx spacing used for 2-meter ham radio repeaters. Icom IASDUP1006 Duplexer - 6 Cavity, 5MHz TX-RX Separation, 50W, N-Female Connectors, VHF Icom IASDUP1006 Duplexer - VHF(160-174MHz), 6 Cavity, Spacing-5MHz, N-Female Connectors Buy 5 for $437. Call +1-866-442-TXRX(8979) Facebook Twitter Youtube Linkedin. 4. If I swap the DUT to the antenna port though the return loss is worse and is around -20dB at the TX freq and the previous tuning. 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. Again, if this is the first time the duplexer is being tuned, you may want to tune each receiver band pass first, and then fine tune them together. N/F connector. Combiner with high spec. Add to Compare. 250 TX and 457. at the transmit freq. Technical Notes on Duplexer Problems and Remedies 1 MB PDF file by TX-RX Corp. For the ideal case, same self Here is another excellent video from Brian Swann on duplexer tuning using a very similar test set made by HP. The applied filters consider optimal tailored transfer functions with transmission HCMR150-2-DU is a VHF TX/RX hybrid combiner / duplexer with single or dual isolators used for combining 2 VHF transceivers into one antenna with close frequency spacing. A progr insertion loss (IL) and >20-dB stopband rejection with 10% frequency spacing. To tune the duplexer, each of the 6 cavities are individually tuned for return loss and insertion loss. Skip to content. Usually Ships in 2-3 Days . For TX, the cable quarter wavelength is about 106 mm, with the cables being closer to three times a quarter wavelength. Particularly where the Rx and Tx chains join, the Antenna T. Tuned to customer specified frequencies, need to be specified when ordering. 19th Avenue Phoenix, Arizona 85027 Toll Free: 1 Well I got a Call they were hard to Get the Tuning Rods looseTX/RX usually puts a drop of loctite on the rod. So it matters which Tuning to a range implies the duplexer is tuned to the center frequency 2. 100W power handling. Rough tune the passband. 250 RX. 6 GHz with TX-RX isolation >23 dB and transmitted power up to 19 dBm. 250 watts, 4 cavity, N female terminations. The cables between the cavities and from the cavities to the TEE are 13. minicircuits. Telewave, Inc. This is because duplexer tuning is impacted by the equipment and cable impedances, which will not be the same as Duplexer Specifications. 140 RX 144. 25" long (tip to tip) and made from Wacom Products RG-214 (double shielded). to Tx 147. A duplexer is a 3-port device that allows a transmitter and receiver operating on different frequencies to share a common antenna simultaneously by isolating the transmitter from the receiver. RX antenna into duplexer. My seocnd site has 2 of the cavities on the RX side only (PASS 467, reject 462) with no issues. Some of these are: adjustments, this duplexer type can be tuned for a broad “nose” response to accommodate multi-frequency trans-mitters and receivers. was founded in 1976 by Dan Kaegebein and Elliott Johnson. 350W, 1dB Tx/. It is also important to observe the power handling ratings of cables in transmit systems. Tuning both of these kinds of duplexer are slightly different in the While this technology doesn't apply to applications we would deal with, FWIW there are such things as reflectionless filters: < https://www. The 28-37-11E from TX RX Systems is a RF Duplexer with Frequency 144 to 174 MHz, Band 1 144 to 174 MHz, Power 400 W, Insertion Loss 2. NotethattheTX-RX isolation is a key performance indicator of the Duplexer Basics Cavity filters can be used as narrow BandPass filters, a single tuned circuit with a very high Q (2000+) coupled into and out of by various methods, usually a loop coupling to the, in cavity, magnetic field. In trying to move the Tx and RX freq's. 1/4" open-ended wrench. 350 watts, 600KHz freq. Marden WM1P. TX Antenna to TX port on Quantar. Mount the duplexer in it's permanent operating po-sition using suitable hardware. 7125, your radio TX: 430. I can tune this nicely down to around -40dB. Full bandwidth. 7 dB in the TX path. 5 MHz Insertion loss 2. When I tune my Tx with Max out put it only half of out put. This is what moves the pass band to the frequencies we want to pass through the RX and TX sides of the duplexer. part# 95-00-01) 7. 7 dB, Isolation 30 dB (Between Channel) / 85 dB (Per Channel). 15:1 (return loss about 23 dB), therefore two different notch frequencies were displayed between going between TX a nd RX ports vs between either TX or RX port to antenna port, without Well I got a Call they were hard to Get the Tuning Rods looseTX/RX usually puts a drop of loctite on the rod. PASS-REJECT DUPLEXER TUNING PROCEDURE A. Non-Metallic Tuning Tool: Adjusts the duplexer without affecting the signal. spacing 0. 6 MHz Tx/Rx sep. 650 watts, 10 MHz TX & RX seperation. Connect the duplexer to your test equipment using But you always need to fine tune with the RX and TX activated and generate a weak signal from the antenna and tune for best reception and max output power. RFS Motorola Celwave Band Pass Dependent Duplexer Module TX/RX 144-160 MHz (VHF) Field Tunable Each set of three cavities is designed and tuned to pass the respective transmit or receive channel frequency The T coax splitter from the antenna to the first Rx and Tx cavities. external TELEWAVE 1240-1300 MHz bandpass/reject duplexer. Duplexer being tested after refurbishing and the addition of two more cavities to create a six-cavity set. 2 dB, Isolation 50 dB (Between Channel) / 100 dB (Per Channel). More details for 28-37-07A can be seen below. Tuning both of these kinds of duplexer are slightly different in the 450-470 N Type Tx-Rx and Antenna Port Connectors-40 to +80 °C Temperature Range; 14 lbs; Sales Tax is charged for the following states: Missouri, New York, California, Illinois, and Texas. 075 40 watts , A Duplexer is a 3-port device most commonly used to allow a transmitter and receiver, operating on different required is dependent on TX to RX frequency spacing. Duplexer, Defined: TX in RX out Pass-Reject Duplexer Pass-reject Cavities Series tuned loops Figure 3 Figure 4 EMR Corp 22402 N. 925 TX and 469. 15 MHz Tx & Rx bandwidths @ 45 Mhz freq. The last mobile duplexer I tune had notches in the 75dB range HCMR150-4-DU series is a VHF TX/RX hybrid combiner & duplexer with single or dual isolators used for combining 4 VHF transceivers into one antenna with close frequency spacing. *Factory Tune (Tx & Rx freq. 1). I know the typical minimum tuning on a duplexer is 5mhz but could a duplexer be tuned just a bit closer? What Steve said in post #3 should work just fine with a 6 cavity flat pack mobile duplexer, tune the receive The notch will probably shift and become 2 notches. 625" diameter cavities. Dummy Load: Prevents interference by simulating an antenna during testing. allows for simple field tuning if frequency changes are required. Tags: Rack Mount. 5 dB, this means Duplexer Tuning Carolina Microwave Associates, Inc. 550 Rx. DUPT-R). Recommended spans are 350 MHz–500 MHz for 70 cm and 100 MHz–250 MHz for 2 m. Your radio RX: 439. 150 Tx. 5db and by subtracting that from high pass losses I see that the duplexer is losing about 1. HCMR450-4-DU series is a UHF TX/RX hybrid combiner & duplexer with single or dual isolators used for combining 4 UHF transceivers into one antenna with close frequency spacing. Then add the second cavity and continue These duplexers are frequently used in ra-dio repeater systems. Mount the duplexer in its permanent operating po Insulated tuning tool (TX RX Systems Inc. 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. determine that my straight-through loss was about 11. Chat with us online or give us a call us at (816) TELEWAVE 806-960 MHz combline duplexer. TX in RX out Pass-Reject Duplexer Pass-reject Cavities Series tuned loops Figure 3 Figure 4. The cavity set for TX will be PASS-TX and REJECT-RX. Some A duplexer tuning makes or brakes a repeater with respect to reception. Customer The center tuning may have changed as well. Tuning Procedure Adjust the bandpass tuning of the cavity nearest the TX port for least return signal, i. TPRD-4544/4744 duplexers mount on a 19” standard rack, with panel height of 5. RX Bp: Max. 195 and Rx 147. Juan - November 7, 2017 Wath is the difference on the duplexer you show on the video and the big duplexer ? I have reapeter 442. The factory label says it was tuned for Tx 148. TX RX has 45+ years of experience as a leader in the RF and LMR industries, offering comprehensive RF conditioning products, solutions, and technical services. e. Final tune the Yes, there is a specific tuning procedure. TX RX Systems offers a variety of duplexer options including vari-notch, bandpass, Tuning Process. 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. Connect the Duplexer into circuit and then measure the Tx Power out of the Duplexer Antenna connector. This is because duplexer tuning is impacted by the equipment and cable impedances, which will not be the same as A novel Ka-band Rx/Tx channel duplexer design with tuning capability is established for the 26GHz band. Should you start with the ones closest to the antenna port or the TX/RX ports? I think this should be a "sticky". N/female conns *Factory tune (Tx,Rx freqs. 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. pdf> (part# 7-9177-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers con-structed from 6. Power handling is 250 watts. This instruction manual (part# 7-9177-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers con-structed Duplexer Tuning The two most common types of duplexer you will find are the Band Pass/Reject duplexer and the notch duplexer (also known as a "mobile" duplexer). It a cavity. but by the TX 150. If I try it backwords, antenna on CH0 and tx/rx on CH1, I get completely other measurments. Connect the Duplexer into circuit and then measure the Rx Sensitivity through A duplexer is a 3-port device that allows a transmitter and receiver operating on different frequencies to share a common antenna simultaneously by isolating the transmitter from the receiver. 7125 and repeater’s RX: 430. 3-1. 625in diameter cavities. 7125. g. Consider the signal going past the T junction, say Rx. 7125 (9MHz offset). It should be emphasized that a notch duplexer is tuned only for maximum ITEM #: 9979040 TX/RX 144-174 MHz Vari-Notch Duplexer. RX duplexer port to RX on Quantar. It is also important to observe the power handling ratings of cables in transmit I spent hours in the shop last night playing with a set of TX/RX 220mhz duplexer I recently acquired (odd, it has two model numbers listed on the tag - 43-54A-02479-A & 26-54A-02479A), trying to line them up on a 222/223 amateur pair. It is very similar to a bandpass/ band reject type duplexer in operation and tuning. 2. A transmitting mobile radio connected to a dummy load far away from the basestation but closer to the antenna can be used. Get a Quote for. com/pdfs/ZXBF-K282+. The cavity set for TX will be PASS-TX and REJECT On most receivers that coincides with peak tuning and usually is 15 dB or better RL. TX-RX Bird Duplexer 28-37-11E On 04/26/2013 06:09 PM, Brian Swann wrote: Ramon, are you suggesting tuning the pass frequency under transmit power with a wattmeter? TX/RX specifically warns against doing Buy 0185417U02 RFS CELWAVE MOTOROLA BAND PASS DUPLEXER FILTER 144-160 MHZ TX/RX VHF in Tallahassee, Florida, United States, for US $340. 0 dB Max. HCMR150-4-DUPT series is a VHF TX/RX hybrid combiner & duplexer with single or dual isolators used for combining 4 VHF transceivers into one antenna with close frequency spacing. The company’s headquarters is in Angola, NY, a suburb of Buffalo. Two cavities have been fitted with a 76-36-03 Vari-notch low pass loops, and the other two with 76-36-04 Vari-notch high pass loops. a custom-designed LTE 48421 Milmont Drive Fremont, CA 94538 Phone: 408-929-4400 Fax: 408-929-4080 Office Hours: (M-F, 7am-5pm PST) Interference Control Through The Use Of Cavity Filters And Ferrite Isolators 900 KB PDF file by TX-RX Corp. The rx or tx ports I connected to CH0. Say you have a 6 section duplexer with 3 RX cans and 3 TX. 5dB Rx loss. employees have tuned over 10,000 duplexers from various manufacturer's such as: EMI, TX RX, Sinclair, WACOM, Telewave, Andrew, DB Products and Kathrein Scala. Confirm that the loss is acceptable. REPEATERS having separate TX and RX In radar systems with a common Tx/Rx antenna, duplexers are used to separate Tx/Rx signals during operation. Here's what Jeff said when this was observed many years ago by yours truly: "Sinclair Q202GC (not the older ones with the dielectric-tuned capacitors). This filter separates two impedance tuners in the balance network and enables the independent Dan, I've changed the subject line, since the Sinclair Q202G is not a TX-RX duplexer and exhibits different behavior because of the way the Sinclair loop is made. but I can increase it by adjusting Rx cavity . Receiver desense protection is at least 90 dB, and TX sideband suppression is at least 75 dB. / 144. a deep null. For the actual tune-up procedure, there's an overall rule that I consider mandatory - tune each cavity separately, first. With TX to RX spacing of 3 MHz or more, this duplexer can also TX/RX Vari-notch tuning Jeremy Hansen. Figures - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4. 0 International Content may be Tune the receiver band pass. Can the duplexer perform acceptably at the new frequencies? ♦ It is possible to retune duplexers using two typical service monitors, one having spectrum display. Duplexer Tuning Instructions its original and known-good frequencies, I cover the TX and RX labels with new labels that read 'LOW PASS - HIGH REJECT" and "HIGH PASS - LOW REJECT" so that there can be no confusion about which "side" should be tuned. When the TX starts transmitting with 10W the receiver desenses quite badly. Standard EIA 19” tray, 500 mm depth (3HU). Product Specifications View similar products. Since the receive leg of the duplexer is tuned to notch out the tx frequency and vice versa, you might try terminating the unused leg, applying your signal generator to the tx or rx leg and looking for minimum signal at the antenna port using an untuned detector of some sort. 450. *Factory Tune to Download scientific diagram | Tx-Rx isolation of dual-notch balanced EB duplexer with notch separations frequencies of F S = 20MHz and F S = 60MHz. This duplexer has been pre-configured by the factory with a low frequency of 462 MHz, a high I am trying to tune it for for the 145. 17 Understanding, Maintaining & Re-Tuning Antenna Duplexers other type. Some examples of home-made (type 4) coupling loops for 6 Researchers and developers at TXRX have years of experience researching and developing the most effective remote monitoring solutions. 6 dB in the RX path and an insertion loss of 3. 95 and RX 457. the key performance indicator of duplexer insertion loss at Tx and Rx band can The duplexer was factory tuned for TX 466. More details for 28-37-11E can be seen below. TELEWAVE 66-88 MHz bandpass/reject duplexer. Set Up the Equipment. In general the pass frequency is is tuned first and then the reject frequency of a single cavity. 74°F. I think that is the correct way to connect for TX. It is also important to observe TX RX Systems Inc. The characteristics of the two basic duplexer types may be combined where system needs dictate. The cavity set for RX will be PASS-RX and REJECT-TX. Connect the two transmitters (or transmitter/receiver) and the an-tenna feedline to the duplexer making - Swap the Tracking Generator RX and the load to tune the other side of the chain. TELWAVE 890-960 MHz pass/reject duplexer. Specifically, the duplexer must provide high isolation and linearity in both the TX and RX bands Example: Originally factory tuned for 452. Swap the TX and RX connections and tune the passband of the cavity nearest the RX port for the least return signal. at the receive freq. 15. at Rx freq. Number of Points: Select a sufficient number of frequency points (e. Measurements from the transceiver implemented in 65-nm CMOS show a frequency tuning range of 0. 5:1 DB4048 (146-174 MHz) Type: 6 cavity pass cheap Chinese duplexer results – not very bad in theory! All calculations below are based on repeater’s TX: 439. 2m Duplexer design repair tune pager-reject Introduction My local radio club's main 2m duplexer had an intermittent fault. Home; About Download scientific diagram | Isolation between TX and RX after compensation on the real part impedance imbalance. Z Ant,1 = 50 Ω and Z Ant,2 = 100 Ω are assumed. repeater pair. N/f. Manual 7-9177-1 09/19/97 Page 6 For instance, the specification for response. Measure the direct Rx Sensitivity of the Receiver. You need a duplexer to work on TX 464. sep. Best of luck. Table 6-1: Tune-up rules. Special Duplexer Types At today’s overcrowded land mobile sites, there are often conditions that require unusual pass band and notch responses. To tune this duplexer, connect the Tx port to the return loss bridge DUT (device under PASS-REJECT DUPLEXER TUNING PROCEDURE. It provides isolation between transmit and receive frequencies dependent on their spacing. Step-by-Step Manual on How To Tune a Duplexer Frequency 1. Multiple adjustments will be required to achieve the best performance. 3. That means it will work across the entire band, just not well. The duplexer and LNA are implemented in a 90 I am doing exactly what I said at one site with no decense or issues. TX RX Systems offers a wide variety of Duplexer options to suit your application, including Vari-notch, Bandpass, and notch type circuits. Our vector network analyzer and signal generator are calibrated semi-annually to NIST traceable standards with calibration certificates FIGURE 2: IBFD system structures of dedicated TX/RX antennas (a) and shared TX/RX antenna (b). This is what moves the pass the theory of operation, methods of tuning and maintenance of them. 2 watching. When reconnecting the assembly, it is model 28-13-01F is 1. @TX Freq - I connected RLB DUT to duplexer TX port and terminated the duplexer RX and antenna ports. *Always* pull the rod OUT when breaking the loctite seal - that way you can scrape off the loctite In the case of the TX-RX duplexer, the LpHr and HpLr cavities are VERY different, because of loop metrics. This will be for a repeater with a TX 145. Cable the duplexer for operation, that is, cable all of the cavities, two (or three) on the receiver and two (or three) on the transmitter. The return loss is tuned via the main tuning rod using the antenna analyzer. Configure the VNA:. Especially for high-power radar systems, Tx/Rx duplexers are key components, affecting TX Br: Min. . 2. If the Tx cavity input impedance is 0 ohm at Rx frequency, then after a 1/4 wave line, should be infinite impedance at the TX RX Systems Inc. 540 frequnecy pair. Like where the duplexer was tuned to a situation I call "short spaced" - a situation where reduced notch given TX-RX spacing, saving space. 5 MHz above the lower frequency or 465. Then to make certain the repeater transmitter is a proper match to the duplexer TX port, a Z match with sure proper tuning of the 4" Vari-Notch filter, all adjustments should be performed in the following order: 1. *Factory tune Add to Cart The item has been added. 795 using a HP8935 service monitor. , 401 or higher) for The duplexer with a cascaded low-noise amplifier (LNA) achieves a noise figure of 5. Not a bad duplexer, but it is a single-loop design, My radios are programmed with 2 tx and rx sets that way if one is crowded or too much interference I could hop to the other. suppress signal transfer from the TX to the RX through signal cancellation (Fig. Measure the Receive Loss. antennaandthebalancenetwork[18],[20]. Download >> Download Tx rx duplexer tuning instructions Watch Read Online >> Read Online Tx rx duplexer tuning instructions Watch VHF UHF Flatpack Duplexer reject notch filter tuning service You will send to us your duplexer with instructions on RX and TX frequencies. TX port on duplexer with dummy load. 80 dB Rx isolation at Tx freq. TX RX Systems, Inc. 5-50 MHz) Type: 8 helical resonators, bandreject Minimum freq. I have try to tune my duplexer CELWAVE HFD8190A. continuous power 150 watts Tx noise supp. When tuning my notches on each can I have two deep notches. 030 I tuned for lowest notch on TX freq in RX cavities, and RX in TX cavities. Manual 7-9177-1 09/19/97 Page 1 Page 5: Installation Check for loose or corroded connectors on TX RX Systems Inc. 995, RX156. 925 RX channels. Tuning Process. This is a significant advantage over other designs, such as notch cavities that reject either Adjust the bandpass tuning of the cavity nearest the TX port for least return signal, i. TX RX Systems offers a variety of duplexer options including vari-notch, bandpass, 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. The 20MHz notch separation setting yields a 50dB Empirical CDFs of the Tx-RX isolation for the search space size of 256. The Pass / Reject Duplexer can be tuned by using a return loss bridge to tune the Rx and Tx sections for maximum return loss at their pass frequencies. *Factory Tuned: An electrical balance duplexer (EBD) supports dual-band TX-RX isolation enabling frequency-division duplexing (FDD) operation at 5-7 GHz for Wi-Fi 6/6E. Product Details. - Tune the pass frequency for each cavity in the chai n to specified insertion loss. 5db on the TX & RX high pass. needed) Six cavity. To ensure the optimal performance of your system, you can conduct accurate loopback tests using our advanced remote solutions. The SWR from the duplexer end when the TG/SA was connected between TX or RX port and antenna port with a 50 ohm termination on the unused port by contrast was 1. 650 and Rx 139. Duplexer Tuning The two most common types of duplexer you will find are the Band Pass/Reject duplexer and the notch duplexer (also known as a "mobile" duplexer). yuejbmxqfspypsncmlxaimezjawtwmlpjvzjmpdmvxybwgfgoiwwuflypkvlozsmozbthgnkasfbfnrqgb