Jerry Flanders wrote:
for SWL. Only downside (a minor one, IMO) is that you might get response
from images 30 KHz away. How much weaker is a signal when you tune to
its image 30 KHz up/down?
Less than 30kHz. The whole point of the exercise is to use wide
filters, so, assuming that the interference is from a carrier and
appears in the demodulated audio, the image can be 25 (5kHz audio) to
20kHz (10kHz audio) away from the carrier (20 and 10kHz from the
passband edge). If the interference is from an audio component at the
extreme of the bandwidth and the transmit is the same as the receive
bandwidth, the carrier can be 20 to 10kHz away (although in the latter
case would have other problems). In practice, I would expect the
carrier to get past a weak filter better than an extreme sideband frequency.
Note this means that if the signals are trying to reproduce audio up to
10kHz, the adjacent channel will be an issue.
--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
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