Search found 225 matches

by G4EML
Tue Jan 19, 2021 10:13 am
Forum: General discussions
Topic: FYI. Battery power saving
Replies: 18
Views: 422

Re: FYI. Battery power saving

I think that probably rules out the display as a way of saving power.
by G4EML
Mon Jan 18, 2021 11:25 am
Forum: General discussions
Topic: FYI. Battery power saving
Replies: 18
Views: 422

Re: FYI. Battery power saving

Roger,

Don’t forget the display on OpenGD77 is permanently selected with chip select held low all the time. I don’t know if that increases the power consumption but it might. It is pretty easy to modify the code to only set chip select low when sending data to the display.

Colin.
by G4EML
Fri Jan 15, 2021 1:48 pm
Forum: General discussions
Topic: DMR Scanning, Private Calls and Talkgroups
Replies: 4
Views: 190

Re: DMR Scanning, Private Calls and Talkgroups

Many commercial systems use text messaging and data in addition to voice. If the system is used by multiple companies some of the voice traffic might be encrypted. OpenGD77 only decodes un-encrypted voice calls.
by G4EML
Fri Jan 08, 2021 7:21 pm
Forum: General discussions
Topic: Documentation for the AT1846S
Replies: 4
Views: 215

Re: Documentation for the AT1846S

As far as I am aware the only documents we have are in the docs folder on GitHub. As with many of the Chinese chips there is not a lot of detail.
by G4EML
Mon Jan 04, 2021 12:14 am
Forum: General discussions
Topic: Slight ticking sound
Replies: 37
Views: 1115

Re: Slight ticking sound

Roger,

I also have not heard the problem on my radios so it’s difficult to diagnose.

One possible cause could be the screen update. The microphone signal shares the same ribbon cable as the screen and keyboard.
Have you tried a version which doesn’t write to the screen during Tx?

Colin.
by G4EML
Fri Jan 01, 2021 4:26 pm
Forum: Bug reports
Topic: Memory channel Scan
Replies: 7
Views: 340

Re: Memory channel Scan

Hi Roger,

I may have a fix for this, I will send you and email.

Colin.
by G4EML
Fri Jan 01, 2021 12:48 am
Forum: Bug reports
Topic: Memory channel Scan
Replies: 7
Views: 340

Re: Memory channel Scan

This is probably due to the same bug you previously reported about the audio amp remaining enabled when changing to an unused timeslot.

The scan hold is controlled by the state of the audio amp. If the audio amp remains enabled then the scanning software will see that as an active channel.
by G4EML
Thu Dec 31, 2020 6:44 pm
Forum: General discussions
Topic: Synchronizing 2 radios to make duplex repeater ?
Replies: 2
Views: 140

Re: Synchronizing 2 radios to make duplex repeater ?

Transmitting both timeslots using a GD77 is theoretically possible but it is not as simple as just supplying it with a full frame of data. To implement the hotspot mode Roger has been very clever and is actually taking the encoded data from the host and decoding it back to the source data which is t...
by G4EML
Wed Dec 30, 2020 11:36 pm
Forum: General discussions
Topic: DTMF Contacts
Replies: 6
Views: 185

Re: DTMF Contacts

Just a thought.... are we muting the microphone input while generating DTMF Tones?
If not then that might explain why the volume control has an unexpected effect.