Dave, the problem with the diplexer that burned up is that its power rating
was given in PEP and not CW.  You need to find one rated for your total
power in CW.  As you know, PEP is a low duty cycle mode in SSB.  I think
your Comet unit was faulgty going in because it shouldn't have failed at
those power levels.

Have a look at the Diamnd MX72D  100 W CW UHF; 150 W CW VHF
Note that its power rating is fotr CW and not PEP.

73,

Dick

----- Original Message ----- 
From: Dave VanHorn 
To: [email protected] 
Sent: 24 April, 2006 13:32
Subject: [Repeater-Builder] Two bands, one antenna, many problems?



While I wait to see if the "horrible noise" has been eradicated, I'd 
like to see thoughts on the next thing I'll be turning my attention to:

I can't change my antenna, other than to replace it with an identical 
one.  What's up there now, is similar to a Comet GP-9 dual band 
antenna.

We're running the VHF pair now 146.85- at 30W, without any issues.
We're coordinated for another pair at 441.9+ and 50W

I had a comet bandsplit unit (they call them duplexers, but I'm not 
going to for obvious reasons) which suffered an internal meltdown at 
this relatively modest power level, despite a nameplate rating of 800W 
pep. 

So I'm looking for feedback on bandsplit units, and basically anything 
that I can do to make this work as well as possible.  We are still 
looking for another site, but that has proven very difficult.




 
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