[CQ-Contest] Bandpass filter
w8ji at w8ji.com
Tue Jul 3 11:28:09 PDT 2012
> Correct for fully functioning and tuned amplifier.
40 milliwatts or so is a correct worse case for any amp, in or reasonably
out-of-tune, unless someone homebrewed something terrible.
Very few radios are damaged by 200 milliwatts, or 23 dBm.
The damage problem is always fundamental energy damage of a receiver.
The only harmonic issue is interference.
> Regarding a far-away receiver, correct.
> An immediate next property neighbor might get a frying shot into the front
>From fundamental, which takes a receiver filter at his end to stop, but
never from a transmitter harmonic. It may help sell transmitter filters to
worry about harmonic damage to a receiver, but it is an imaginary worry, not
a reality. A transmitter filter is really only to lessen interference
problems operating near harmonic frequencies, not at all required to prevent
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