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Strange noise
Posted: 21 Apr 2022, 20:33
by ve2rn
At this freq. 14.287Mhz ,with or without antenna, lsb or usb, with differents headset, differents power source including batteries this is happening only on the (tr)uSDX and not on my other rig.
https://youtu.be/qU0QAskdshU
It is not critical as everything else is working perfectly but if i have a way of diagnose it
could help understanding the device.
Re: Strange noise
Posted: 22 Apr 2022, 00:51
by AC9YY
ve2rn wrote: ↑21 Apr 2022, 20:33
At this freq. 14.287Mhz ,with or without antenna, lsb or usb, with differents headset, differents power source including batteries this is happening only on the (tr)uSDX and not on my other rig.
https://youtu.be/qU0QAskdshU
It is not critical as everything else is working perfectly but if i have a way of diagnose it
could help understanding the device.
I have the same thing at 14.288 MHz and shows S7-8 or -80bBm with a dummy load.
Re: Strange noise
Posted: 24 Apr 2022, 23:42
by ve2rn
No body have an idea of the problem? My hometown friend have the same issue at 14.288Mhz ,still it is not critical but i found the same sound at 3.704Mhz . It maybe not curable for now but if somebody have a theory on that, i am enough healthy to ear it.
Re: Strange noise
Posted: 25 Apr 2022, 00:05
by AC9YY
Both my kit and assembled unit have the symptom.
Re: Strange noise
Posted: 25 Apr 2022, 23:13
by Faraaz VK4JJ
Probably a harmonic of one of the local oscillators, at a guess. It is electronic noise - nothing can be done about it, I'd assume. Unless you designed and installed a notch filter for that specific frequency.
Re: Strange noise
Posted: 27 Apr 2022, 21:53
by Colinsk
Oleds are known to be noisy. Have you tried without it?
Re: Strange noise
Posted: 27 Apr 2022, 23:47
by ve2rn
Colinsk wrote: ↑27 Apr 2022, 21:53
Oleds are known to be noisy. Have you tried without it?
I will not go that far for a minor problem and risk of damage by removing the oled on the board.And the noisy problem is addressed i think by Manuel modif on the oled.Thanks anyway for the suggestions for oled or filter but somebody more professionnal than me can find the cause some day. I keep my ears open on this case.
Re: Strange noise
Posted: 03 May 2022, 06:39
by Luca66
Same signal at 14,288, much more audible in USB, S6, without antenna.
Re: Strange noise
Posted: 03 May 2022, 07:46
by Faraaz VK4JJ
This is known, and a consequence of some form of electrical noise within the circuitry.