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As stated Air/Ground vhf/uhf is AM and
simplex working. I have also noticed a well modulated AM transmitter
is more potent than a FM transmitter when working at max range. On AM the RX
bandwidth can be opened up to receive several stations simultaneously then
select the one of interest by closing down the selectivity, the same applies on
CW. On FM if you tried this the transmission would fall into a black
hole, in other words the FM rx has to be tailored to the
exact bandwidth of the transmission (same deviation value)
g3kev
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