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- Problem with 60KHz
Re: Problem with 60KHz
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Cracked it Sigi
A few weeks ago I fitted a new Ethernet switch
to give me more ports and I used a spare old one using a non-standard coaxial
power supply lead.
The PSU was obviously failing and although
it produced 12 volts it was extremely noisy.
Because it was a network switch the noise
was getting into all the CAT5 cables including the one used for my remote SDR.
I also found my charger for my electric
drill battery was very noisy. It was permanently on so the PSU was in poor
Attached the 60KHz signal is now in the
clear. An amazing difference!
main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Siegfried Jackstien
Sent: 22 October 2020 11:37
Subject: Re: [SDR-Radio] Problem
such noise is coming from switching psu or power inverters
charger ... or other small switching thingy ...
direction could be found with a directional antenna
Am 22.10.2020 um 08:54 schrieb Pete Ferrand:
Yes, those things happen, happened to me almost 20 years ago.
I was living in a rural area of New Hampshire and heard a broad noise
that prevented the clocks from working, had to drive them some miles away to
get them to work. It was around 55-58 kHz.
I called the local electric utility and they sent their interference
specialist, who was a ham, around with some very expensive gear and it heard it
as well. He drove around and said it could be heard for a couple miles around
but didn't peak up anywhere. His conclusion was that it was not coming from nor
was it propagated by the utility's wiring or equipment, and so he had no
further authority to investigate. There was no industry in the area.
So I had to live with it until I moved a year or two later.
From: Allan Isaacs
Sent: Oct 22, 2020 3:11 AM
Subject: [SDR-Radio] Problem with 60KHz
For the last few weeks I've had trouble with our radio clocks and the reason is
a very strong signal around 58KHz which has evaded attempts to find its source.
I assume that it's local interference. Picture attached.
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