Search found 241 matches

by G4EML
Sun Sep 27, 2020 10:56 am
Forum: General discussions
Topic: PTT latch external mic audio GD-77
Replies: 8
Views: 63

Re: PTT latch external mic audio GD-77

Many external mikes are wired with the microphone ground connection connected to the PTT pin (Outer of the 3.5mm Jack). The PTT pin is connected to ground (outer of 2.5mm jack) when either the external or internal PTT is pressed. So the external microphone is only connected when the PTT is pressed. ...
by G4EML
Fri Sep 25, 2020 1:12 pm
Forum: General discussions
Topic: Ability to open the squelch of CTCSS or DCS is enabled??
Replies: 16
Views: 148

Re: Ability to open the squelch of CTCSS or DCS is enabled??

Reducing the squelch to zero would work but would be ‘non standard’ compared to most other radios. It would also be more fiddly to use if all that was wanted was to quickly check for activity. The project has probably got to the point where it is not possible to add extra features like this without ...
by G4EML
Fri Sep 25, 2020 10:28 am
Forum: General discussions
Topic: GD77 Book of Hacks
Replies: 3
Views: 95

Re: GD77 Book of Hacks

That nebula.wsimg URL seems to be some sort of web site copying robot. There are lots of comments about it online. I doubt there is a human involved. It does actually credit the source at the bottom of each page. However I agree it only makes sense to publish Jason’s original web address as that wil...
by G4EML
Fri Sep 25, 2020 10:18 am
Forum: General discussions
Topic: Ability to open the squelch of CTCSS or DCS is enabled??
Replies: 16
Views: 148

Re: Ability to open the squelch of CTCSS or DCS is enabled??

I can see why it may be being requested. Most commercial radios have a ‘monitor’ button that opens the squelch while pressed. That works regardless of CTCSS setting. It’s main use is for shared channels where different users have different CTCSS tones. On those systems the user is expected to press ...
by G4EML
Sun Sep 20, 2020 11:36 pm
Forum: Feature requests
Topic: Simplex dmr repeater?
Replies: 11
Views: 435

Re: Simplex dmr repeater?

Yes, the DMR spec defines the mode and what is required but unfortunately the problem is that we do not know how to control the hardware chip in the radio to achieve that. The documentation for the chip is very poor and we do not have any good examples to follow. It took a lot of trial and error exp...
by G4EML
Fri Sep 18, 2020 1:21 pm
Forum: New members post here first
Topic: GD-77 user says Hi
Replies: 2
Views: 44

Re: GD-77 user says Hi

OpenGD77 does not use scan lists.
Scanning is similar to most amateur rigs.
All channels in a zone will be scanned by default. Individual channels can be excluded from the scan by setting the skip flag in the channel details menu.
The special ‘all channels’ zone has its own all skip flags.
by G4EML
Fri Sep 18, 2020 1:14 pm
Forum: Feature requests
Topic: Simplex dmr repeater?
Replies: 11
Views: 435

Re: Simplex dmr repeater?

See the previous reply. OpenGD77 does not support DCDM and will not do so without significant development. Whilst the CPS may have a timeslot selection entry this has no effect on Simplex transmissions which contain no timeslot information. Support for single frequency repeat needs DCDM on both the ...
by G4EML
Wed Sep 16, 2020 10:26 am
Forum: Bug reports
Topic: DCS audio cuts out
Replies: 16
Views: 618

Re: DCS audio cuts out

Increasing the hang time for loss of tone decode will not normally cause an increase in the length of the squelch tail on a clear channel because the carrier squelch will still mute the radio on loss of signal. It will however be noticeable on a channel where the carrier squelch does not work, such ...
by G4EML
Sun Sep 13, 2020 9:58 am
Forum: General discussions
Topic: Building doc for OpenGD77 way of doing Talkgroups etc
Replies: 19
Views: 401

Re: Building doc for OpenGD77 way of doing Talkgroups etc

Roaming still works without the beacons but the radio will revert to scanning mode when there is no network activity. When you first press the PTT there is a longer delay while it try’s to access each repeater in the roam list to find one that responds. It really is only useful in a coordinated syst...
by G4EML
Sat Sep 12, 2020 11:38 pm
Forum: General discussions
Topic: Building doc for OpenGD77 way of doing Talkgroups etc
Replies: 19
Views: 401

Re: Building doc for OpenGD77 way of doing Talkgroups etc

I know that is is off topic but Motorola roaming doesn’t actual work that way. It is much dumber than you would think. Basically a radio just scans a roam list until it finds a repeater that is strong enough to use and than hangs onto that repeater until it gets too weak to use. Then it scans for an...