Hi Don,
I had a noise of this type show up locally... the cause was a new VCR...
everything I tried failed to remove the crude generated by this device...
on or off... I ended up throwing it in the trash and replaced it with a
DVD player
It had to be because most of the circuits were 'on' all of the time... the
only way to stop it was to cut off the power totally... i.e. 'pull the
plug'...
For the 'fun of it', I did radiation checks and the VCR had greater
'coverage' in area than my 100mw AM BCB (tube type) 'phono oscillator'.
And I did do all of the sheilding and by-passing of this device humanly
possible... to no avail...
73
vince
ka1iic
-.--.
On Sat, 12 Apr 2003, Donald Chester wrote:
>
>
> A few days ago, a new interference appeared on 80m. It consists of rough,
> 60kHz modulated carriers, spaced at 15.7325 kHz intervals. At first I
> thought it might be a touch lamp, but the carrier frequencies are extremely
> stable, despite the rough sounding modulation. The strongest carrier
> appears to be at 3579.55 kHz. Carriers are clearly audible from 3406.48 kHz
> to 3736.9 kHz, with vestiges detected above 4 mHz. The sound of the
> modulation changes every few seconds, and the signal strength varies as the
> modulation changes. At its strongest point it is about 10 dB above S9. I
> get the strongest signal on the 160m. beverage, but it is audible on the
> 10m. ground plane and indoor loop. The signal is weakest on the
> transmitting dipole.
>
> I measured the frequencies using a DDS vfo with 1 Hz resolution. Individual
> frequencies may be inaccurate due to the difficulty in finding zero-beat in
> the presence of the rough 60Hz modulation, but the spacing of the signals
> was determined by averaging the difference in measured frequency between
> adjacent carriers throughout the band. At the time, the DDS vfo was
> zero-beat with WWV at 10 mHz.
>
> Readings were taken at the following frequencies:
>
> 3500.88
> 3516.662
> 3532.25
> 3548.15
> 3563.69
> 3579.55
> 3595.29
> 3611.02
> 3626.74
> 3642 (approx)
> 3698 (approx)
> 3674 (approx)
> 3690 (approx)
> 3706 (approx)
> 3721 (approx)
> 3736.9
>
>
> I am hoping someone might save me from having to re-invent the wheel in
> chasing down this interference, by identifying a probable source based on
> the above data.
>
> 73 de K4KYV
>
>
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