OpenGD77

FYI

We currently have a small problem where if the radio is in DMR mode, occasionally there is a buzz sound from the speaker.

This can often occur when a repeater carrier stops transmitting, but also seems to be triggered by random QRM.

We tried to fix this by filling the DMR audio buffer with silence when the DMR Rx signal ends, however this seemed to cause clicking during DMR Rx on some radios.

So I had to remove this buffer clearing, and the next private alpha will have the noises again, until we can find another solution to the problem, because removing the clicking from the DMR Rx audio is more important than the occasional buzz noise

Sometimes the audio it's like distorting, and it creeps into modulation... don't have any reason, sometimes distort and some not...

EA5SW wrote: ↑

Mon Jan 03, 2022 12:58 pm

Sometimes the audio it's like distorting, and it creeps into modulation... don't have any reason, sometimes distort and some not...

OK

We are fixing the I2S audio bus problems, but I dont know if the distortion is the on the I2S or whether its perhaps some errors in the DMR audio data.

We do not have a method to detect Rx BER in either the GD77 or MD9600 firmware, so its difficuoit to know where the problem is occurring

We think we have a fix for the DMR Rx clicking problem

It was being caused by the I2S buffer being emptied by the C6000 under some conditions

VK3KYY wrote: ↑

Thu Jan 06, 2022 4:05 am

We think we have a fix for the DMR Rx clicking problem

It was being caused by the I2S buffer being emptied by the C6000 under some conditions

Very nice, I hear no longer clicks on DMR RX.

You don’t have this problem, it was specific to the firmware during development and is not something a user can change.

Colin

Hello, my Md9600 makes these clicks on the speaker at the end of the analog RX and dmr even with volume at zero, is there a solution?

This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML

G4EML wrote: ↑

Fri Sep 30, 2022 2:36 pm

This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML

There is also a click suppression option in the Sound Options screen

VK3KYY wrote: ↑

Fri Sep 30, 2022 8:38 pm

G4EML wrote: ↑

Fri Sep 30, 2022 2:36 pm

This is a design flaw with some versions of these radios.
It needs a hardware mod to fix it.

https://www.pc5e.nl/downloads/rt82/manu ... bridge.pdf


Colin G4EML

There is also a click suppression option in the Sound Options screen

Many thanks to all of you, super solved here, the clicks are gone.