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Author Topic: Need help with this RFI sample  (Read 2920 times)
KE0CU
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Posts: 150




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« on: May 26, 2016, 12:57:20 PM »

Out of the blue yesterday, WSJT-X started showing some regularly spaced interference on the waterfall screen. See https://goo.gl/photos/uSBeEAQZhUxVso7LA. It is predominant on 40 and 20 meters. The spacing is a little irregular but averages about 56 Hz.

I've been able to disconnect all wall warts, etc. except for the power supply which runs the rig, and the power supply which runs the PC. I can't really hear it so I can't shut off the PC! The antenna has been disconnected. Does anyone have thoughts as to what the source of this might be?

Thanks!

Hank/ke0cu

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WB4SPT
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Posts: 729




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« Reply #1 on: May 26, 2016, 02:14:38 PM »

If the antenna is out of the picture,  I'd be thinking the power supply now has a noisy diode.  Explains the near 60Hz effect. 
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KE0CU
Member

Posts: 150




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« Reply #2 on: May 27, 2016, 08:01:16 AM »

Yes, it looks like the power supply (a Jetstream S28M). I cycled it off, then on and the interference went away. I'll prepare to get a new one.
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