Well I just got off the phone with TX-RX and learned a few things.
The setof cavities that I have is rated for four cans, which has an
insertion loss of 1.5 DB, so with the third can, that takes it to 2.2
DB insertion loss, so with my 200 watts in, it would be about 120 out
and that is where I am at. So I am not far from being where I should
be. Thanks for all the input.
Mathew
> >Well Mostly correct there, I've got the power back up, still not
full bore,
> >but did find out why the power was coming up slowly, it was the
exciter, one
> >of the coils was loose, fixed it and power back up, but still
missing some.
> >200 in for 120 out, so not quite there yet.
>
> Time for a Z-matcher or isolator.
>
> Bob NO6B
>
> > Might see about the cables, I
> >think they were originally cut for 147 Mhz, might need to be
changed to get
> >a better match.
>
> A 2 MHz move will not make a difference w.r.t. duplexer cavity
> intercabling. If you don't have a Z-matcher or isolator, try
changing the
> length of the cable between the amp & duplexer. Also remember that
when
> you insert the wattmeter in line with that cable, you're changing
the
> length of that cable & hence the impedance the amp sees. IMO these
kinds
> of loss measurements can only be properly done with an isolator on
the amp
> output.
>
> Bob NO6B
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