Topband: Magnetic Loops

[Tom W8JI]

> 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.