[amsat-bb] Re: RFI identification

Nate Duehr nate at natetech.com
Tue Jan 22 20:57:44 PST 2008

On Jan 20, 2008, at 5:59 PM, Tony wrote:

> I have an RFI problem that I'm trying to identify. It's a continuous
> pulse noise that pops on every 1/2 second. The timing between each  
> pulse
> is perfect (about 0.533 seconds) and doesn't seem to change.
> The noise is spread accross all HF bands and on some days it seems to
> creep up into the 100MHz range; it's also stronger on the lower
> frequencies. The signal is directional and goes from almost nothing to
> S-8 with the antennas pointed south.
> The noise appeard suddenly in December and has not stopped. I have a
> recording and would appreciate any suggestions.

One initial thought.

First... make sure it's not in your own "backyard".  Run the receiver  
affected off of battery power and kill the main to your house.  (Don't  
forget to turn off anything on a UPS.)

If it disappears, you know where to start hunting, at least, and it's  
an easy test.

Consumer electronic gear is getting consistently noisier (is this  
stuff passing any RF testing at all?) and often-times your own "toys"  
are making the RF racket.

Nate Duehr, WY0X
nate at natetech.com

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