lowfer/ham QRM (was Re: [Lowfer] Medfer TX Loop Question(s)??)

[Ed Phillips]

> It may not be as much of a problem as you think.  After all, if an
> antenna is any good at these frequencies, its Q will be high enough so
> as to pretty well eliminate any out of channel garbage by itself.  

	I guess the question is to whether "pretty well" will be good enough? 
The stronger the original signal the stronger will be the "out of
channel garbage>

> And
> since the antenna would present a high reactance off frequency, a TX
> that is putting out serious spurs and trash would quickly find itself in
> trouble - it might even let the magic smoke escape! 

	The antenna can be a better radiatior at harmonic frequencies,
partially negating the effect of the bandpass characteristics of the
antenna coupling network.  Again, it's a matter of degree.  The services
I'd worry about include the navigation band and the BC band itself,
where there a lot of receivers and probably quite a few people who
listen to some of the weaker stations.

> I also suspect that
> for the most part, only a few serious operators will get on the band,
> and probably use narrow band, weak signal modes.  Just as with PSK31 and
> the like, you can easily work around a strong but clean signal if you
> have reasonably good RX gear.

	I'm not worried about interference between stations in the band, but of
problems with interference to other services.  As for what guys might
do, I'm not worried about the current experimenters either.  However,
consider the case of the "long-path" bunch on 3800 Khz -.  Some of them
are running a lot more than the legal limit, and some of the signals are
pretty lousy.  If and when something happens I hope it will turn out
that I'm just being a dismal gloomy  pessimist, but in my experience
with a number of different hobbies with potential public exposure, when
the "big boys" move in they can screw it up for everyone.

Ed