[Boatanchors] interference

Wed, 27 Aug 2003 20:47:34 -0700

Makes some sense..If it ran at 50kHz and had odd harmonics, like a 
nice square pulse. then 100kHz spaced stuff makes sense.

WBob

[email protected] wrote:

> One thing to check is any switching power supply. Although some operate in 
> the 40 KHz region, during a recent analysis of several modes, I found the 
> strongest harmonic (on one unit I had) right on 7.040 MHz. Yep, I was trying to use 
> it to power my QRP rig.......RIGHT on the CW calling frequency! Interesting to 
> watch these harmonics on a spectrum analyzer. Especially during power on and 
> off. Talk about a sweep generator......
> Some are MUCH worse than others.
> 
> Regards,
> 
> ron
> N4UE
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