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Thread: Icom 2720 cross and repeat

  1. #1

    Default Icom 2720 cross and repeat

    I'm pretty new to ham radio, so please excuse my naivety.

    I have an icom 2720 in my car, and I have a baofeng UV-82wp. I decided to try and get a little creative and test out crossband repeat.

    I'm not sure if I chose a good test frequency to try out though.... I wanted to test it in my own before trying to reach out to anyone else.

    The only other radio I have working at the moment is a pair of Motorola FRS walkie talkies. My plan was to try and set up the baofeng to transmit through the 2720, and pick it up on the Motorola.

    My first step was to set all three radios to the same FRS frequency, and set the 2720 and Baofeng to frequency mode, and see if I could get each radio to transmit to each other simplex.

    I tried a few different FRS frequencies with the same results:

    Baofeng tx - 2720 rx good, Motorola rx good
    Motorola tx - 2720 rx good, Baofeng rx good
    2720 tx - did not work. The display of the 2720 says "OFF" whenever I press the PTT on any FRS frequency i try. I tried setting tx power to medium and low, with same results.

    Anyone know why it would do this? I was wondering if perhaps the 2720 knows the FRS/GMRS frequencies and won't allow it to tx because its overpowered for those frequencies?

    Any help for a newbie is much appreciated.

    Sent from my SM-N950U using Tapatalk

  2. #2

    Default

    Well, this should show what a newbie I am....

    I should have checked the 2720 capabilities before asking a question. From Icom website:
    Frequency coverage Transmit (USA Version)

    VHF: 144-148 MHz

    UHF: 440-450 MHz

    Frequency coverage Receive (USA Version)

    Left Side: 118-550 MHz

    Right Side: 118-174, 375-850, 810-999.99 MHz (less cellular)

    That explains why I could rx but not tx on the 2720.

    So, on to my next attempt at testing this out...

    I will still be using the 2720 and the UV-82wp, but instead of the Motorola handheld, I will be using an rtl-sdr dongle connected to Kyocera Duroforce II with android operating system, running SDR touch, with SDR key.

    This morning I was able to get the 2720 into crossband repeat mode, but I wasnt able to recieve anything via SDR touch. I first tried to tx using the Baofeng on 146.550, and had the 2720 set to rx on 146.550 and tx on 146.820. I was able to see the left and right side of the 2720 rx'ing and tx'ing but I wasnt able to rx anything on SDR touch. I did read somewhere that the 2720 needs to be programmed with one side on VHF and the other on UHF (I'm not sure if that is the definition of crossband repeat, or if this functionality will work on separate frequencies withing VHF or UHF - newbie, still a newbie).

    Perhaps at lunch or after work I will try setting the left side of the 2720 to 146.550 and the right side of the 2720 to a UHF frequency and see if SDR touch gets anything on UHF rx.

    Sent from my SM-N950U using Tapatalk

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