A switching power supply could be the cause and it could be ina any number
of devices. Computer monitors are one example.
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----- Original Message -----
From: "Kurszewski Chad-WCK005" <Chad.Kurszewski@motorola.com>
To: <rfi@contesting.com>
Sent: Tuesday, November 21, 2000 6:09 AM
Subject: [RFI] 7 kHz birdies in 160M band
>
> I'm experiencing a new problem this 160M season. (I don't
> listen to top band at all during the summer, so I don't know
> when this problem started, other than it wasn't here last year.)
>
> I have STRONG buzzing birdies (not a single tone, but a raspy
> buzz) that occurs every 7 kHz, starting around 1700+ kHz and
> goes up to about 2700 kHz. It's loudest right in the 160M
> band, 1800-2000kHz. (Not because of a resonant antenna
> measurement, but as observed on my beverage antenna.)
>
> In band, on my TX antenna (shunt fed 110' tower), the buzz
> is S9+10dB. It's S7 on my beverage.
>
> I've shut power down to the majority of the house and almost
> all items in the shack, so I think it's outside my property.
>
> Any ideas?
>
> Thanks,
>
> Chad WE9V
>
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>
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