Hi guys,
I'm having a lot of fun reading all those RFI stories. My own experience
instead is rather drab! I run legal limit from my apartment, and don't
seem to interfere anything at all. I can run the computer to do SSTV or
RTTY with the amp, I can make a phone patch without the phone picking up
any RFI, my alarm stays quiet, I can even let the TV run (off air, not
even cable) and nothing strange happens... And there has never been any
RFI complaint from a neighbor! How boring!
I want to get my RF out of the antenna, high up on the roof, and not out
of the feedline, earth connection, AC wiring, etc. For that purpose I
installed a highly effective current mode balun on my feedline. 15 turns
on a stack of FT-240-61 toroids. It works. I get out quite well, into
ham receivers around the world, but not into local TVs nor other stuff.
An interesting experiment was when I tried to load up the tower on 80m,
against earth. That was of course without the balun, and having a lot of
RF radiated from inside the building. Even without the amp, using just
the 100W radio, I locked up the computer, made the battery charger start
a fast charge cycle on a full battery, set off the alarm, and made my
bread machine try to bake a bread out of pure air. It was fun, but then
I returned to my well balanced antenna and the balun!
Folks, you might want to check what's doing the main part of the
radiating in your stations: The antenna, or the feedline and power
wiring! The antenna sure gets out better, and is farther away from
potential RFI receivers! A dipole with coax feedline and no balun is a
sure recipe for disaster in this regard. But it can be lots of fun, sure!
Manfred.
----------------------------
Visit my hobby website!
http://ludens.cl
----------------------------
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|