Dave wrote:

"starman" wrote in message


If you don't hear that background noise with the whip antenna, the
problem is almost certainly too much signal (overloading) from the
external antenna. That's why I recommended a passive preselector.

Okay, that I can understand. If I leave the radio switched to DX while
listening to BBC etc, the background noise is still there, but like the
desired signal is at least twice the strength it would be with the whip
alone. Therefore I switch to Local, which blanks out the noise. WithVOK to
Central and South America I can't do that without losing the desired
broadcast as well. Will a preselector still help (at least somewhat?) or is
this just the way it is?

Thanks,

Dave


Your describing (above) the classic symptom of overloading. Make the
noise comparison using just the receiver's whip antenna first, then
connect the external antenna. You can leave it set to DX for both
antennas. If you hear the noise *only* when using the external antenna,
the problem is overloading. The noise you're hearing is coming from many
intermodulation products caused by insufficient dynamic range when using
an external antenna. A passive preselector will allow you to use the
external antenna without the noise.


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