Is there an equivalent of Squelch-line on DMR ?

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Rob Johnson
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Is there an equivalent of Squelch-line on DMR ?

Postby Rob Johnson » 12 Jul 2016, 03:27

Hello All,

Is there a way of "picking-out" the equivalent of the squelch-line on a DMR radio, thinking of something like an MD785 here. It would be very useful for "cross-banding" (cross-technology-ing) between an analogue-mobile and a DMR-mobile radio. Could see nothing obviously marked when looking at a circuit-diagram of a DMR mobile earlier-on today. I did notice that there are "mode" and some other possible trigger-lines going to the audio-amplifier, if that's what they are. Do these lines carry-out "opening" the audio-amp up when a valid signal is received ?

Any information greatfully received. Thank you.

Rob.

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Scott_93
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Re: Is there an equivalent of Squelch-line on DMR ?

Postby Scott_93 » 27 Feb 2017, 03:03

I think it's in the Hytera service manual. Yes there is such a thing. In fact you can wire a Hytera cross pins and use it as a cross-band repeater just off the bat and if you put it through a cavity filter as an in-band repeater too.

Scott.

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Re: Is there an equivalent of Squelch-line on DMR ?

Postby paulears » 23 Apr 2017, 20:31

I've been experimenting with an optometrist controlled relay I bought from aliexpress - little pcb, with a sensor on the end of a short cable - I blutacked this to the RX LED on a radio and it closes the relay. My idea was a dPMR repeater with a couple of hand held, but the two cycles of codec travel mean that the usual digital latency gets doubled, and the vocoder quality is slightly worse. I didn't want to have to open the up to do it properly - and the relay switch proved to be the simple bit!

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Re: Is there an equivalent of Squelch-line on DMR ?

Postby Freddie » 03 May 2017, 22:03

paulears wrote:I've been experimenting with an optometrist controlled relay I bought from aliexpress


Why does your eye-doctor decide when the relay closes? :D

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Re: Is there an equivalent of Squelch-line on DMR ?

Postby paulears » 05 May 2017, 07:57

Never noticed that auto-correct - optometrist????? Letting the numpties at vision express run radios would be fun - took 3 optometrists to get my glasses prescription right!

Opto-isolated!

Rob Johnson
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Re: Is there an equivalent of Squelch-line on DMR ?

Postby Rob Johnson » 01 Jun 2017, 03:01

Hello All,

Sorry I have been away from here for a while and not replied to these informative posts. I will have a play with the MD785 that I have. I have now got the pin-out info for the 26 pin (why don't they use a NORMAL DB25 ?) on the back. Looks like the pin that does "speaker-enable" is the one to go for. I will report back. Thank you.

Rob.


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