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DMR Trunking: Hytera PD755 Stuck in "Out of Range"


 

Hello Adrian,

my setup is still not working, but after a lot of testing, I have some insights - maybe that rings a bell?

- Sometimes, the Hytera radio is able to book into the dmrtc, but most of the time not. I have not recoginzed a pattern and it's not reproducable.

- I tried to access the 7 channels with a Tier II Anytone Radio. On channels 5-7 (below center), I can wake up the transmitter, and MMDVMhost shows a lot of received and transmitted packets. The dmrtx complains (Rejected local id ......., not registered with the site) , but on MMDVM level this is working. Also, channel 4 (the highest frequency),? _sometimes_ works. On Channel 1, no wakeup is needed, but also I see no received DMR frames in the log when I press PTT on my anytone. On Channel 2-3 and usually on 4 also, I only see that the downlink was activated, but I do not see any packes being received afterwards.

Reseach on the internet raises the suspicion that this could be related to DMRDelay. But why should a different delay be needed for the different channels?

I have DMRDelay=90 (and burst_delay_msec=100, if that's related).

As some channels work and others not, and the channel is aalways ctivated, I would non suspect rx-/txgain-Problems.

- I tried to set the control channel to 7 in dmrtc and in the mmdvmhost config file for channel 7. Magically, the registration works reliably in this setup and I could switch between talkgroups.

- When booked in with the hytera and subscribed to tg91, the radio bings and beeps all the time, but I cannot hear any voice transmissions from TG91 on the Hytera. I do see TX data on channel 1 timeslot 1 .My suspicion is that channel 1 TS1 is hardwired somewhere in dmrtc and/or qradiolink, as it's carrier is always on and I cannot disable RF channel 1/Timeslot 1 in DMRTC, even when the control channel in on RF channel 7.

- Weirdly, I can partially hear TG91 being transmitted on my Anytone on Channel 1 TS in monitor mode.

Any ideas how to make channels 1-4 receive reliably? It's unclear to me what could be the difference to channels 5-7, that do receive reliably.

Thanks

Christian DB9CR

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