Dave, the retuning of the cavities after putting the harness on the
cavities is normal when the harness/cable lengths are not optimum.
These Q style duplexers should always use a lightning protector at the
antenna port to protect the centre conductor to shield voltage levels
from exceeding the
6 can duplexor won't tune smoothly, generates RX noise...
Lightning hit, Yep, its probably flashed over on one of the first cans
from the ant, you might have carbon tracks and a twisted/melted cap. Also
inspect your connectors, Ts and the coax itsself as a possible source of
noise after a
Yeah Thor is never nice. But then again we hardly ever get lightning
here in the Vancouver area. None of my systems have been struck yet.
The frequencies are:
146.800 TX / 146.200 RX amateur system
I suspect the harness though because if I tune each cavity
individually, and then place them
I'd probably ask a few different questions... but here's some
answers to the ones you did ask. You didn't say if the capacitor
was an air variable, plastic/teflon type piston rod or a small
size piston cap like a Johansen type.
Here are my questions:
1) Besides the weird behaviour, is
ve7ltd [EMAIL PROTECTED] wrote:
I suspect the harness though because if I tune each cavity
individually, and then place them all together, I have to
fiddle with the cavities to get them all to line up again
on the spectrum analyzer.
Normally placing cavities in series will move the
HI Dave,
Those small piston caps are known to fail mechanically as well as
electrically. Usually you can tell because they don't feel as smooth
and don't tune as 'linear' as good ones.
Sometimes it seems like they have a 'bad spot'.
When they are bad like that, you can still get them to appear
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