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TOPIC: Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX

Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 22 Jan 2020 12:47 #1

I have a new SunSDR2DX purchased last Friday from Gigaparts. I am getting Noise - Static - humming while using MIC 1 on the radio. I have tried 3 PC microphones. 1 being a Steel Series Computer Gaming headset and the other 2 just standard computer microphones with Pink - 3 pin TRS connectors. The Gaming headset also has a 3-ping TRS connections. This is what the manual suggest for mic1. The noise I hear is obviously coming through the monitor circuit but most disturbing it is showing up on my transmit signal - the noise is there even with the Mic gain down to 0 - crackly and static. I know all 3 of the microphones are working properly when connected directly to my computer and I have no noise or humming - works as expected. I decided to see how these 3 microphones work when using Mic PC in ExperSDR2 software - They work fine - I do not experience the humming - buzzing noise when the mics are connected to the computer then the signal goes to the radio via Mic PC connection - The signal is clean. So there must be an issue with the mic 1 input on the radio to give this noise. It is unusable.

Has anyone else experienced this? Does anyone use the Mic 1 input with a computer headset or microphone and have a clean signal?
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 23 Jan 2020 14:14 #2

  • 2E0GKG
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Hi
I am experiencing exactly the same issue with the SunSDR2DX . I managed to isolate the issue to the +voltage that is being fed back into the condenser mic on one of the pins. I resolved this by connecting a capacitor in parallel of around 100uF / 16V in an external jack that has filtered the noise out.

It is something that needs to be addressed though as it appears to be a hardware issue as I did not have this issue with the SunSDR PRO2 which worked without the workaround

Thanks

Nicholas - 2E0GKG
Last Edit: 23 Jan 2020 14:17 by 2E0GKG.
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 24 Jan 2020 19:41 #3

Thanks for the info. Expert has a mod. I will let Roman advise of this.

K4JKB
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 19 Feb 2020 07:59 #4

  • e72x
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Same problem here What is the solution?


73,
Gordan,
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 19 Feb 2020 08:12 #5

  • Rome
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Hi, Gordan.
There is a mod for the Mic1, I'll send it to you via email.
Роман, Roman
Expert Electronics
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 19 Feb 2020 09:06 #6

  • e72x
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Thanks,
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 19 Feb 2020 19:14 #7

  • EI9HEB
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Roman,
Can I get the details too?
This email address is being protected from spambots. You need JavaScript enabled to view it.
Regards
Pawel
How do you VooDoo?
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 21 Feb 2020 09:45 #8

Hello,
i have the selm problem with my Mic1 Connector on the 2DX radio.
Have the radio now sines 1 week, it is a nice toy but in the moment are not so happy with the NOISE Hum and crackly TX Audio on mic1.

Please Roman can you send me also the MOD for this problem via Email????? E-Adress is: This email address is being protected from spambots. You need JavaScript enabled to view it.
best 73 Guenter
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 21 Feb 2020 15:34 #9

  • ik2xde
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Can you please share the solution with all...??
Thanks.

73 de IK2XDE Andrea.
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 21 Feb 2020 16:05 #10

  • DL9NBJ
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Yes, share it with all, and what is exactly the problem, thank you .
vy 73 de Thilo DL9NBJ

Problems with my SunSDR2DX:

VOX - works only on 2m, not on HF
TUNE - does not work, reduces power when tuning if SWR is bad
Displayed supply voltage has incorrect values
Crosstalk betwen antenna ports A2 <-> A1
Solved: ... ;-(
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 17 Mar 2020 07:33 #11

hello Roman
can you please send it to me too. This email address is being protected from spambots. You need JavaScript enabled to view it.
thank you
73 Petr
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Noise - Hum - Static - crackly TX audio - on MIC 1 - SunSDR2DX 17 Mar 2020 08:43 #12

  • ik2xde
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Why not share the solution with all....??
Thanks in advance.

73 de IK2XDE Andrea.
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