[Elecraft] Band pass filters

[David Hachadorian]

You need a filter on the TX radio to prevent its phase noise from being 
heard on other bands.  Just pressing PTT on the TX radio, even without 
putting out any measurable power, will raise the noise floor on multiple 
bands. With suitable band decoders driving filter selection, 
fast-switching between bands is possible.

Dave Hachadorian, K6LL
Yuma, AZ


On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
> Given the improved performance of modern transceivers, is there still a call for high specification W3NQN band pass filters in a 2-transmitter station?  For example on a Multi-2 contest environment.  For instance K3S + KPA + KAT. The filter fitted between radio and amplifier.
>
> I have the *feeling* that a receive-only filter (with tx bypass) might be all that is needed.  This is much easier to implement than a full transmitter-rated set making fast switching between bands (eg for a quick look around) very quick and easy from the keyboard, etc.
>
> David G3UNA
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-- 
Dave Hachadorian, K6LL
Big Bear Lake, AZ