[Amps] Question about Marconi amp filter board

[Steve Thompson]

Web Williams wrote:
snip
> My question is this- in the group's opinion, would the RF
> follow the path of least resistance if I just tie all the filter
> inputs and outputs together (sort of like installing multiple
> Hustler loading coils on a mobile antenna), or must the
> various filter combinations be switched in and out as band
> changes occur?

It's not a question of the path the rf will take, but the possible/likely
damage to the amplifier modules, not to mention the possibility of
oscillation.

> I guess I -could- run it without the filter
> board, but it probably would no longer meet spectral purity
> requirements

Please don't do that.

Sorry, but there's no alternative to sorting out a switching arrangement of
some form so that the correct harmonic filter is in place for each band.
It's possible that the filters were developed specifically in conjunction
with the amplifier modules so that not using them (or using some commercial
autoswitching unit instead) will affect the operation of the amplifier.

Steve
, which is why the engineer put the filter
> board there to start with. I want to use it if I can.