Search found 176 matches

by G4EML
Thu Feb 27, 2020 12:01 am
Forum: CPS
Topic: COM Port problem
Replies: 2
Views: 20

Re: COM Port problem

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

Colin.
by G4EML
Tue Feb 25, 2020 1:31 pm
Forum: Developer discussions
Topic: serial data with internal mic and speaker
Replies: 14
Views: 171

Re: serial data with internal mic and speaker

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...
by G4EML
Tue Feb 25, 2020 11:01 am
Forum: Developer discussions
Topic: serial data with internal mic and speaker
Replies: 14
Views: 171

Re: serial data with internal mic and speaker

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.
by G4EML
Tue Feb 25, 2020 12:16 am
Forum: Developer discussions
Topic: serial data with internal mic and speaker
Replies: 14
Views: 171

Re: serial data with internal mic and speaker

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...
by G4EML
Sun Feb 23, 2020 5:52 pm
Forum: Development updates
Topic: Experimental version with option to disable CC filtering
Replies: 59
Views: 1156

Re: Experimental version with option to disable CC filtering

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.
by G4EML
Wed Feb 19, 2020 9:51 pm
Forum: General discussions
Topic: Port this firmware to Md380 and others...
Replies: 18
Views: 326

Re: Port this firmware to Md380 and others...

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...
by G4EML
Wed Feb 19, 2020 9:39 pm
Forum: Development updates
Topic: Experimental version to help DMR breakup
Replies: 43
Views: 1236

Re: Experimental version to help DMR breakup

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...
by G4EML
Wed Feb 19, 2020 9:15 pm
Forum: General discussions
Topic: Port this firmware to Md380 and others...
Replies: 18
Views: 326

Re: Port this firmware to Md380 and others...

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...
by G4EML
Wed Feb 19, 2020 11:59 am
Forum: Development updates
Topic: Experimental version to help DMR breakup
Replies: 43
Views: 1236

Re: Experimental version to help DMR breakup

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...
by G4EML
Tue Feb 18, 2020 1:00 am
Forum: Bug reports
Topic: [Normal operation of the hardware] White noise at no volume
Replies: 3
Views: 116

Re: [Normal operation of the hardware] White noise at no volume

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.