Your forgetting that the front end is still broadband and wide open and
being blasted into intermod many times. These days not everyone is blessed
by the latest gigabuck rig which still is wide open until it hits the
roofing filter which wouldnt be there if there werent problems.....
My first experience was with a modified R4C in the early 80's which at least
had a front end tuneable preselector. Ive since used it with the various
xcvrs here and easily hear the difference plus it can be tuned either side
of the wanted signal. Does wonders for BCB rejection also.
Carl
KM1H
Actually a properly designed purpose built loop can offer a reduction in
noise from the high Q selectivity offered.
That would only be true if the receiver system noise bandwidth was wider
than the loop's bandwidth. If you had a SkyBuddy with 30 kHz noise BW and
put a 5 kHz wide loop in front, then you would have a noise BW limited by
the loop.
The only way antenna BW reduces noise is if the receiver is overloading
from out-of-band signals, or the receiver's ulitmate selectivity is wider
than the loop antenna.
While an SX99 or something that terrible might benefit with a high Q loop,
even an SX101 would not.
All good topband ops know how to put up a beverage at night.
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Topband Reflector
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All good topband ops know how to put up a beverage at night.
_________________
Topband Reflector
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