OpenGD77

The Com port is part of the openGD77 firmware. So it won’t be available if you have not updated the firmware.

Colin.

I looked at this for another reason, I would like to add a remote control option. Unfortunately I don’t think there are any unused interfaces. There appears to be an I2C port connected to the encryption chip which we are not currently using. It might be possible to use that. But I think the I2C is u...

Yes you are correct, the schematic wrongly shows the USB connection is on the rings.
So it probably can’t be done as I thought.

You would either have to modify the radio by shorting out the socket switch contacts or connect a separate usb cable directly to the board.

I think, in theory it would be possible to make a cable that did not disconnect the microphone and speaker. Both Mic and Speaker are on the tip connections of the jack plugs. The USB connections are on the rings with the ground on the body of the earphone. So if you could make jack plugs with no tip...

I think that goes to show how poor the signals from some hotspots really are. They rely pretty heavily on the radios to clean things up.
Disabling colour code detection is not really relevant to hotspot use anyway as you are always going to know what it should be set to.

The MD380 is quite an old radio now, if someone was to go to all the effort I would think it would make more sense to target one of the newer ones like the MD-UV380 or the MD-2017. Alternatively the Anytone radios are a good candidate as the firmware doesnt appear to be encrypted, however the baseba...

I am currently running with a timeout of 13. No issues so far. It is still only a third of a second. Fading and flutter can easily cause dropouts of that sort of duration. I would expect some audio artifacts in that situation but it would recover instantly the signal returns. The AMBE Codec is prett...

This question has been asked before. Whilst it might be technically possible to port the openGD77 firmware to the MD380 and other radios it is a massive task. The Processor and hardware are completely different so the whole firmware structure would have to be ported over to another development envir...

Hi Roger, I had a read of the ETSI spec looking for clues. It looks like the timer involved here is called T_ChSyncTo in the spec. This is defined as the channel sync timeout timer and is used to determine how long to wait before moving from the in sync state to the out of sync state in the event of...

That is normal operation and not a bug.
The audio amp will always generate low level noise when powered on. Even if the volume is set to minimum.