[RFI] Persistence Pays Off in eliminating a Nasty RFI Source
k8tb at bosscher.org
Sat Dec 12 05:46:56 PST 2009
I once traced interference to a 2 meter repeater to one of those
preamps in the loft of the garage. Six miles away! The owner was only
so-so to deal with. They had switched to cable, and this was a 300 ohm
in/out preamp, so the output cable was simply tossed back by the preamp,
which caused the oscillator to form. He kinda figured out what it was,
pulled the AC plug and the interference went away. Then it came. "What
incentive is there for me to keep this unplugged?" While one might be
tempted to thump ones chest and spout off FCC regs, his wife was
standing there. I simply stated, "Well, an unused TV preamp consumes
electricity, for no reason, and it is now a fire hazard." "Herbert, you
take and throw that thing in the trash right now!". He went back up and
grabbed it and handed it to me.
Finding the interference is only half the battle. Neighborhood
diplomacy can be the real effort.
Dennis Vernacchia wrote:
> This from Bruce KQ6B in Valley Center ( rural ) CA
> BRAVO !
> Bruce writes:
> As you may know, I've had a noise problem here for years. ....
> It turns out that up in the attic of my neighbor's house the previous owner
> had a TV antenna and an amp (either a pre-amp or a distribution amp). When
> the owner finally located it and unplugged it and the coax, the noise
> problem essentially went away.
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