Is there an equivalent of Squelch-line on DMR ?

Use this section to discuss Digital Amateur Radio operations, such as D-Star and other digitally-encoded traffic
Rob Johnson
Posts: 10
Joined: 06 Jan 2016, 00:06
Location: South-East England.

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.


User avatar
Super Member
Super Member
Posts: 439
Joined: 04 Oct 2009, 20:39
Call Sign: Sunray20Alph
Location: GBR/Overseas

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.


Super Member
Super Member
Posts: 477
Joined: 10 Jun 2007, 22:41
Call Sign: G4RMT
Location: North East Suffolk

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!

Return to “Amateur Radio - Digital voice and data”

Who is online

Users browsing this forum: No registered users and 1 guest