Search found 218 matches

by G4EML
Wed May 13, 2020 9:26 am
Forum: Feature requests
Topic: Port to TYT UV380/UV390
Replies: 61
Views: 2927

Re: Port to TYT UV380/UV390

Another problem with colour screens, as demonstrated by the Anytone 868 is that they tend to generate more RF noise than simple monochrome ones. The Anytone suffers with Low sensitivity on VHF because the screen interferes with reception.
by G4EML
Tue May 12, 2020 3:29 pm
Forum: Feature requests
Topic: Port to TYT UV380/UV390
Replies: 61
Views: 2927

Re: Port to TYT UV380/UV390

The MD-9600 problem only affects the first two hardware variants, the latest models have been fixed with a re-design of the PA power control circuit. The problem is the opposite to your description. It works fine in high power but at mid or low power the PA takes too long to turn on so the first par...
by G4EML
Wed May 06, 2020 8:20 pm
Forum: Bug reports
Topic: [Not currently supported] Admit criteria not honoured
Replies: 10
Views: 409

Re: [Not currently supported] Admit criteria not honoured

Admit criteria doesn’t tell you you are accessing a repeater. It just stops you transmitting if the repeater is busy to prevent you keying up on top of another user.
by G4EML
Mon May 04, 2020 9:09 pm
Forum: Development updates
Topic: Release 3rd May
Replies: 61
Views: 3303

Re: Release 3rd May

I have no idea. However DStar and YSF are not TDMA modes so it may be. Even without AFC a constant transmission is easier to demodulate as the detector can filter and average out the signal to determine a good threshold point. DMR is difficult to decode because the noise bursts in the unused timeslo...
by G4EML
Mon May 04, 2020 6:49 pm
Forum: Development updates
Topic: Release 3rd May
Replies: 61
Views: 3303

Re: Release 3rd May

The ADF7021 AFC only works with constant carrier transmissions. It is not able to cope with TDMA pulsing transmissions as used by DMR. The bursts of noise in the unused timeslot cause it to loose lock.
by G4EML
Sun Apr 26, 2020 6:29 pm
Forum: Bug reports
Topic: [Fixed] RX CTCSS does not work...
Replies: 36
Views: 1709

Re: [Fixed] RX CTCSS does not work...

That sounds like a very weak signal. I agree that a longer squelch tail will always help in that situation. Your mod seems to work. It might need to be tested with a stronger signal to make sure that it doesn’t cause any unwanted side effects. An automatically adjusted delay as mentioned before migh...
by G4EML
Sun Apr 26, 2020 4:02 pm
Forum: Bug reports
Topic: [Fixed] RX CTCSS does not work...
Replies: 36
Views: 1709

Re: [Fixed] RX CTCSS does not work...

Yes, a delay on just the CTCSS detection is a better way to do this. The normal squelch will then still suppress the squelch tail. 100 cycles sounds a little long. I would suggest reducing this as much as possible. I have implemented similar adaptive squelch logic on repeater controllers in the past...
by G4EML
Sun Apr 26, 2020 10:09 am
Forum: Bug reports
Topic: [Fixed] RX CTCSS does not work...
Replies: 36
Views: 1709

Re: [Fixed] RX CTCSS does not work...

If the squelch is closing in speech peaks as you describe then the most likely cause is trying to listen to a 25KHz wide deviation signal with the radio set to 12.5KHz. If your radio is already set to 25KHz and the squelch is still closing on speech peaks then it sounds like either your squelch sett...
by G4EML
Sun Apr 26, 2020 9:55 am
Forum: New members post here first
Topic: VE2XPM - How to get started with development?
Replies: 14
Views: 466

Re: VE2XPM - How to get started with development?

You can actually do a lot of development work without needing the debugging hardware. I have never needed it and have done several updates. You can always temporarily add the usbprint function to output variables or progress flags to check your code.
by G4EML
Mon Apr 20, 2020 2:34 pm
Forum: General discussions
Topic: Question on Zone function
Replies: 9
Views: 271

Re: Question on Zone function

That’s correct. The RX list is also used for selecting the transmit Talkgroup in OpenGD77 Press the left and right arrows to move through the list. Your radio will transmit on the selected Talkgroup. Unlike other DMR radios this means you only need one channel per repeater or hotspot. First you sele...