--- In [email protected], "Jeff DePolo" <[EMAIL PROTECTED]>
wrote:
>
> > Now the new cable is in place, and that power that was getting
turned
> > into heat is getting delivered to the cans. But, something smells
> > funny, and the interconnect cables between the cans are noticably
> > warm.
>
> How much power are you running into the cavities?
Just over 100W, according to the bird.
> I can't think of anything inside the cans that would "smell funny"
with
> power applied unless there was really something very wrong with
them (like a
> shorted capacitor).
At the end, i measured 100W in and nothing out. Not even budging the
needle on a 5W slug.
As a longshot, is there any chance that your PA is
> going spurious, which could a) cause excessive heat/loss in the
cabling to
> the off-channel spurs creating high VSWR, and b) the "smell" could
be a
> component failing in the PA, which could either be a victim of the
> oscillation, or the cause of the oscillation.
Hmm.. This is a motorola TLE amplifier, it worked fine here on the
bench, and I didn't see anything on the SA at all, but I did not have
it connected with exactly the same cables.
> Or, the difference in cable length between the old conglomeration
and the
> new patch cable has made the PA unhappy resulting in the spurious
condition
> (again, this is a bit of a longshot, but a plausible explanation).
Well, I'm going to pull both and bring them back here for diagnostics.
The band-splitter unit (comet) is one that is rated for a kW, and
seems ok, other than it had one internal short before that stopped my
VHF output, but I don't think there's anything wrong with it now.
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