Burst timing being outside the acceptance window of the repeater

Some handhelds appeared to work but the repeater didn't see the voice packets. It was due to the burst timing of the handheld being outside the acceptance window of the repeater. There was quite a variation between radios.

If that is your problem you could try the following...

in the MMDVM firmware DMRSlotRX.cpp module you will find the following lines:-

const uint16_t SCAN_START = 400U; const uint16_t SCAN_END = 490U;

These define the acceptance window. You could try decreasing SCAN_START to 390 and increasing SCAN_END to 500.

Having a wider window puts more load on the DUE so don't make it too large.

Of course this may not be your problem but its worth a try.

Colin G4EML