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CROSS BAND REPEATER WITH 2 BTECH MOBILES
WHAT’S NEEDED:
RJ-45 CABLE (Diagram on Page 4)
2 BTECH MOBILES
The frequencies used in this guide are for illustrative purposes only. It is the responsibility of the user to program frequencies that he(she) has been granted the authority to use.
This Illustration Example Uses:
136.025MHz to 465.025MHz – PL (CTCSS) 74.4Hz
On the other radio select the upper display (with the A/B Button). Set the frequency to 136.025MHz (or your own VHF frequency)
2: On both BTECH mobile radios set the PL Tones with MENUS 11 and 13. In this example set R-CTCS (Menu 11) to 74.4Hz and T-CTCS (Menu 13) to 74.4Hz
3: Enter MENU 43 REP-M and select CTDCS for two mobiles – this will require the repeater forwarding (X-Band Repeat) to activate once the confirmed PL signal (CTCSS or DCS) is received will transmit it on.
4: Exit the Menus and connect the radios with a RJ-45 cable (diagram on page 4). Insure your external antennas are not in close proximity to avoid interference.
5: If the radio receives the carrier frequency with the required CTCSS or DCS tone (depending on your configuration) the radios will now pass along and transmit the signal from VHF-UHF or vice versa as a cross-band repeater[/vc_column_text]
THIS IS ONLY RECOMMENDED TO SUPPORT CROSS–BAND REPEATING – DO
NOT USE 2 VHF OR 2 UHF FREQUENCIES
MAKE SURE THE TWO ANTENNAS ARE FAR AWAY IN ORDER TO PREVENT
THE INTERFERENCE BETWEEN THE TWO BTECH MOBILES
Comments (11)
Hi all, I recently tried the CROSS BAND REPEATER WITH 2 BTECH MOBILES. I have 2 Btech UV25x2. I made sure to follow the instructions and to make a RJ-45 cable. Also have a tester to make sure the Cable was configured correctly. It did not work and when plugging back the 2 microphones like it was, the lights and the buttons don’t work anymore on both of them. But the PTT and modulation is ok. Tried to do a reset and reprogram the radio with chirp did not fix it. Did something burn out in the radio’s ?? Please help!
Can this cable be used if we will be using the in SAME band like the UHF band? Or any modification with the pin assignments on the UTP Cable? Anyone…?
You obviously didn’t read this, did you?
Does this REP-M mode exist on any of your current radios in your stable? It seems the model at the time of this article is no longer around.
What would be really cool is if you could do this with two different models. A 50w for the VHF and low watt for the UHF.
All BTECH mobiles (excluding the UV-50X3) support the REP-M menu
So….
If I add an external duplexer, if there any reason I can’t build a UHF/UHF GMRS repeater using the REP-M feature and cable?
Would this work for 2 50v2 as a gmrs repeater with full duplexer setup.
Bump, I would also like to know if this method has been confirmed on the 50v2. Manual doesn’t specify how to accomplish this. Or what cable to use if any.
fyi tunned duplexer with single antenna
In the wire diagram are pins 7 and 1 intended to be left blank? That is to say, DO NOT CONNECT, 7 to 7 and 1 to 1? The reason I ask is because is 6 to 6 and 4 to 4 are stated. In other words, only use 6 wires?
Also, is the recommendation to only use for cross band repeat based on concerns of desense in poorly designed builds that are too close together on TX RX?
If a duplexer is used and separation is within recommended specs, say 600Khz VHF or 5Mhz UHF, is there a reason for concern?
I can confirm the cable works as expected when pinned as diagramed. I have a BTECH UV-50X2 (Second Generation) configured for transmit and BTECH UV-25X2 (Second Generation) configured for receive. Not sure if it makes a difference but I have the end of the cable with brown on pin 8 connected to transmit and the end with blue on pin 8 connected to receive. Pin 7 and 1 are blank. I’m in the UHF band with a 5Mhz offset and a duplexer with 1 antenna. So far so good. No issues. I will update here if any problems arise. I will say that my noise level is a bit high. That could be for a number of reasons. But, the system is performing as expected. What I did to mitigate the noise as best I could is lower the volume on the receive radio as low as possible while still passing audio. The transmit radio has the volume nob all the way down. I have both radios set to EAR on menu 61. I am also using a large clamp on ferrite bead on the control cable since I used UTP CAT5 cable. I have ferrite toroids on the power cables of both radios. I have the radios on separate shelves approximately 2.5 feet apart.