OpenGD77

Yes, it is called Single Frequency Repeat and is available on high end DMR radios from the likes of Motorola and Hytera. As Daniel says it also needs DCDM support on the handhelds to differentiate the timeslots. It doesn't need a duplexer as it is single frequency. However it does need radio hardwar...

You are correct.

The original firmware does not enumerate as a com port.

OpenGD77 does enumerate as a com port in normal use.

Both radios enumerate as an STM DFU device when set to download firmware. (This is defined in the radios bootloader which remains untouched by OpenGD77. )

Colin G4EML

Yes, as mentioned before we know the the radio can do DCDM but we don't know how to do it! As Roger said, DCDM seems to be a vendor specific feature and as such is not well documented in the ETSI DMR spec. Likewise the limited HRC6000 documentation barely mentions it. It might be possible to generat...

In theory it would be possible to have flat audio option for the radio, at least as far as the actual RF chip is concerned. However there is no control over the additional audio components in the microphone and speaker paths. So the end result may not have a flat response, especially at the low freq...

Making a recording probably wouldn't help. The tones won't be recorded. It is not unusual for CTCSS to sometimes be affected by individual voices. The transmitting radio should filter out any low frequencies in the voice before adding the CTCSS tone and likewise the receiving radio should filter out...

Your description indicates that you are accessing the repeater OK but the content of your transmission is not being accepted. You have checked the talkgroup settings, timeslot and colour code, that only really leaves your user ID. Have you entered it correctly? Some Repeaters will only pass traffic ...

From your description it sounds like you are accessing the repeater OK but possibly with the wrong Talkgroup set. Or maybe you have programmed a private call instead of a group call. I would check your talkgroup programming.

I think you have Latitude and Longitude confused.
Latitude can't be more than +- 90 degrees.

That looks like what we refer to as the V5 board.

Your main problem may be internal PCB damage. The PCB is an 8 layer board with the 12V supply running on one of the internal layers. The place you can see the burning is where the internal layer links to the bottom layer. If it has got hot enough to damage the insulation between layers then it might...