Strange noise

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ve2rn
 

Posts: 55
Joined: 13 Jan 2022, 20:45

Strange noise

Post 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.
Sylvain Naud
VE2RN
AC9YY
 

Posts: 133
Joined: 21 Mar 2022, 00:04
Location: Illinois, USA

Re: Strange noise

Post 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.
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ve2rn
 

Posts: 55
Joined: 13 Jan 2022, 20:45

Re: Strange noise

Post 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.
Sylvain Naud
VE2RN
AC9YY
 

Posts: 133
Joined: 21 Mar 2022, 00:04
Location: Illinois, USA

Re: Strange noise

Post by AC9YY »

Both my kit and assembled unit have the symptom.
Faraaz VK4JJ
 

Posts: 215
Joined: 30 Dec 2021, 21:56

Re: Strange noise

Post 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.
Colinsk
 

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Joined: 21 Feb 2022, 23:57

Re: Strange noise

Post by Colinsk »

Oleds are known to be noisy. Have you tried without it?
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ve2rn
 

Posts: 55
Joined: 13 Jan 2022, 20:45

Re: Strange noise

Post 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.
Sylvain Naud
VE2RN
Luca66
 

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Joined: 16 Apr 2022, 13:02

Re: Strange noise

Post by Luca66 »

Same signal at 14,288, much more audible in USB, S6, without antenna.
Faraaz VK4JJ
 

Posts: 215
Joined: 30 Dec 2021, 21:56

Re: Strange noise

Post by Faraaz VK4JJ »

This is known, and a consequence of some form of electrical noise within the circuitry.
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