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GD77 Bad RX-audio with fully charged battery
Posted: Mon Mar 27, 2023 2:43 pm
by oe7abh
Hello Colin and GD77 team,
with a fully charged battery (>90%) the RX-AUDIO is not so good....
Is it possible to fix the RX-audio problem with a hardware modification on the GD77? I would be willing to solder a little too.
73 Alfred OE7ABH
http://tyrofly.at/funk.htm
Re: GD77-RX Audio
Posted: Mon Mar 27, 2023 8:04 pm
by G4EML
Jason VK7ZJA developed a fix for the audio amp.
It is near the bottom of this document
https://nq4t.com/anytone/GD77mods.htm
Colin G4EML
Re: GD77-RX Audio
Posted: Tue Mar 28, 2023 2:34 pm
by oe7abh
Hello Colin,
Thanks for the link.
Fixed bad RX audio today. (Battery charge over >90%). RX audio now works UFB!
There is a little more space for the SMD resistor than in the instructions, an SMD soldering pad is free directly behind it!
10k resistor replaced with 15k!
73 Alfred OE7ABH
http://tyrofly.at/funk.htm
Re: GD77 Bad RX-audio with fully charged battery
Posted: Wed Mar 29, 2023 7:25 am
by oe7abh
Hi david,
in our club are many GD77 devices from the bad RX audio at 100% charged battery.
My modification has fixed the error. I am thrilled...
Whether the own device is affected, one can recognize fast. Charge the battery to 100% and listen to a QSO....
But the soldering is not suitable for beginners....
73 from Austria, Alfred OE7ABH
Re: GD77 Bad RX-audio with fully charged battery
Posted: Wed Mar 29, 2023 11:02 am
by G4EML
The problem didn't affect all radios. It may be that the factory made a change or it may just be down to luck with different batches of amplifier chips.