No TX PL on GM300
Posted: Wed Aug 23, 2017 6:36 pm
Hello -
I have an old Motorola GM300, model number M43GMC29CsAA which I'm trying to use on amateur 2m frequencies. I've searched far and wide and can't seem to figure out what's going on.
I programmed it using RSS and / or Radio Doctor for some simplex frequencies and a few local repeaters. On simplex, it works beautifully, but on the repeaters, it only keys at the end of the transmission.
What confuses me further is that when I use a known good HT configured to require a PL tone to receive, it works fine.
Repeater Scenario:
While monitoring a repeater on a separate radio, I begin a transmission. I key the mic and begin to talk. Nothing is heard on the radio monitoring the repeater. I finish saying something and unkey and then the repeater gives me a roger beep heard both on the monitoring radio and the GM300, so perhaps the PL is being engaged too late? I reverse the split on the monitoring radio and transmit from the GM300 and hear myself just fine, eliminating the repeater essentially. I've tried this on two different repeaters with the same net result.
HT Scenario:
I program an HT to require a PL tone of 131.8 and program a mode on the GM300 to transmit on a simplex frequency with a TX PL of 131.8. I transmit from the GM300 to the HT and hear my voice.
Now I program the HT to require a PL tone of 88.5 and keep the GM300 using 131.8. I transmit from my GM300 to the HT. The RX light lights up and no audio is heard, as expected.
I revert the HT to require a PL tone of 131.8 and all is well again.
I've gone through RSS fairly exhaustively and I don't have any kind of PL inhibit enabled. As seen in the HT scenario, *some* kind of tone is being generated or I wouldn't be able to hear myself on the HT.
I'm sorry if the solution is obvious, but this one has me stumped. Thank you very much for any suggestions...
Matt
I have an old Motorola GM300, model number M43GMC29CsAA which I'm trying to use on amateur 2m frequencies. I've searched far and wide and can't seem to figure out what's going on.
I programmed it using RSS and / or Radio Doctor for some simplex frequencies and a few local repeaters. On simplex, it works beautifully, but on the repeaters, it only keys at the end of the transmission.
What confuses me further is that when I use a known good HT configured to require a PL tone to receive, it works fine.
Repeater Scenario:
While monitoring a repeater on a separate radio, I begin a transmission. I key the mic and begin to talk. Nothing is heard on the radio monitoring the repeater. I finish saying something and unkey and then the repeater gives me a roger beep heard both on the monitoring radio and the GM300, so perhaps the PL is being engaged too late? I reverse the split on the monitoring radio and transmit from the GM300 and hear myself just fine, eliminating the repeater essentially. I've tried this on two different repeaters with the same net result.
HT Scenario:
I program an HT to require a PL tone of 131.8 and program a mode on the GM300 to transmit on a simplex frequency with a TX PL of 131.8. I transmit from the GM300 to the HT and hear my voice.
Now I program the HT to require a PL tone of 88.5 and keep the GM300 using 131.8. I transmit from my GM300 to the HT. The RX light lights up and no audio is heard, as expected.
I revert the HT to require a PL tone of 131.8 and all is well again.
I've gone through RSS fairly exhaustively and I don't have any kind of PL inhibit enabled. As seen in the HT scenario, *some* kind of tone is being generated or I wouldn't be able to hear myself on the HT.
I'm sorry if the solution is obvious, but this one has me stumped. Thank you very much for any suggestions...
Matt