Certainly this is an issue with solid-state radios
hooked directly to an antenna ("low-power" operation),
but for guys running high power, does not the out-of-
band TX crap get significantly attenuated through the
amp?
Mike N2MG
--- k6xx@juno.com wrote:
> Someone commented that one need only use
> the filters on receive, not transmit. This
> is NOT true with many (most?)solid-state
> transceivers. Their output low-pass
> filtering passes lower frequency broadband
> hash (phase noise, etc.) right to the
> antenna. Sure, its low-level, but this low
> level is still strong QRM to a co-located
> receiver. You must use the filters on the
> transmitter output to remove the hash
> generated in the transmitter -- a receive
> -only filter cannot discriminate between
> in-band hash and in-band signals. This
> condition affects the situation where a
> higher-band unfiltered transmitter is run
> with a lower-band filtered
> receiver, but not the opposite.
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