CloseCall and DMR

[pb_lonny]

I didn't think this was possible due to short TX bursts. I logged this today via CloseCall while walking around the CBD.

https://lh3.googleusercontent.com/-B-HcM7PWPuw/Y4BDb9CXOAI/AAAAAAAARPg/Kn30o9irTEoGRTGz69fq5KyFLbZ4ggV6ACNcBGAsYHQ/s1600/20221125_151841.jpg

 

[Reconrider]

As long as the feature is paid for, of course it will work

 

[pb_lonny]

My understanding was that CloseCall can't pick up DMR transmissions, due to the short TX time. If that is not the case and it can pick up DMR (which it looks like it can), that is good for me.

 

[Ubbe]

Close Call can pick up continuous transmissions. If it's a carrier that only transmit in a few millisecond bursts it cannot do it. I can't remember the minimum time but something longer than a 1/2 second carrier are needed.

I can catch DMR and Tetra from base stations if there are no other strong transmitters in the frequency band at that time.

/Ubbe

 

[wtp]

IF i got it right, it can't pick up the transmission from the input.

 

[pb_lonny]

Thanks. So it will trigger on the base TX but not the handheld TX. That makes sense.

 

[GTR8000]

This was just covered in another thread: BCD325P2: - BCD325P2 Close Call Not Working on UHF DMR

It was clarified that DMR transmissions from a base station/repeater are no issue, as they are a continuous carrier. The issue is with subscribers, which transmit in 30ms on/off bursts, as DMR is TDMA modulation.

 

[ka3jjz]

Another good question for the FAQ...Mike