Rx or Tx?
Slight ticking sound
Re: Slight ticking sound
Tx FM and DMR ?
Re: Slight ticking sound
It seems that this problem is indeed linked with the open firmware. I installed the open firmware on a brand new Baofeng RD-5R and I have the same sound. I looked at the bug reports, the closest that can find is the bug about "motorboarding".
Re: Slight ticking sound
This is a known problem.
Which has been reported many times.
However none of my radios have this problem , and I have all radios supported by the firmware, so I have no way to analyse the cause of the problem
Which has been reported many times.
However none of my radios have this problem , and I have all radios supported by the firmware, so I have no way to analyse the cause of the problem
Re: Slight ticking sound
I would be happy to lend out a radio if that could help. I am based in Germany.
Re: Slight ticking sound
Its not practical for me to borrow radios from people, because I could damage them whilst analyzing the problem etc.
I disassemble all my radios and solder wires inside them, and sometimes its not possible to re-assemble them.
Re: Slight ticking sound
hI!
I have 2 GD-77s both are fine, they don't generate any "motorboarding" sound.
However, I have a hypothesis - it might be caused by insufficient filtering of analog circuitry power lines and penetrating the ripple generated by CPU running the program (periodical patterns caused by main loop cycling, periodical interrupts etc) to its power lines. The original software may have different power consumption profile during its run and the generated ripple may have different spectrum (higher frequencies, which are filtered better)...
It's possible that some production batches contain different components, or some of them may be totally missing (to cut the costs)... It's Chinese ...
Re: Slight ticking sound
At least some of the noise is coming in via the audio Analogue to Digital Converter.
There is no noise, even from radio which have "motorboating" if clear the incoming data to 0x00
So the noise is not the result of something else in the firmware, or the way the Tx audio is generated and output.
However, I have no idea why some radios seem to have noise on their audio input, yet the official firmware does not have the noise.
My only guess, is that the engineers know where the noise is coming from and perhaps have something in the official firmware to mask that there is noise.
It could be something as simple as one sample of audio with a spike of noise on it, every 30mS, because by the time the audio has been through the AMBE codec, what comes out the other end, is radically different from what went in.
There is no noise, even from radio which have "motorboating" if clear the incoming data to 0x00
So the noise is not the result of something else in the firmware, or the way the Tx audio is generated and output.
However, I have no idea why some radios seem to have noise on their audio input, yet the official firmware does not have the noise.
My only guess, is that the engineers know where the noise is coming from and perhaps have something in the official firmware to mask that there is noise.
It could be something as simple as one sample of audio with a spike of noise on it, every 30mS, because by the time the audio has been through the AMBE codec, what comes out the other end, is radically different from what went in.