Mark,
Bandpass/Bandreject, also known by the short name "BpBr" is the same as a
Bandpass/Notch duplexer.
The names are somewhat misleading, because the bandpass effect is
relatively modest, although the notch is quite sharp. It is a good idea to
have a pure bandpass cavity or two between the duplexer and the receiver,
especially if you have a preamplifier.
Gee- do you really need 150 watts? If your duplexer is rated at 100
watts, why abuse it with more than its rating? Even with an isolator after
the PA, you are definitely looking at grief down the road- maybe in the next
block! With so much power, your repeater will likely "talk" much farther
than than it "hears." I'd suggest running the PA at 80 watts or so, and
make sure that the first load on the isolator is rated at 75 watts or
more.
Remember, the range of a repeater is *usually* limited by its ability to
hear the stations in the field, not by its output power.
73, Eric Lemmon WB6FLY
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of N9WYS
Sent: Tuesday, February 07, 2006 10:03 PM
To: [email protected]
Subject: [Repeater-Builder] Duplexer questions
Can someone please
explain what the difference is between a BandPass/BandReject duplexer and a
BandPass/Notch duplexer?
Is one more
desirable that the other and if so, why?
Also - I just put a
new PA online today on my 444.550 machine. The duplexer I have is rated at
100W, and the PA is putting about 150W into it -- I was running about 50W with
the old PA. (BTW - There is an isolator between the duplexer and the
PA.) Will this cause me any grief either now or down the road and if so,
in what way?? I'm finally getting the bugs tuned out of this system and I
want it to be top-shelf. (Of course!)
Thanks in
advance!
Mark -
N9WYS
Repeater Trustee -
WW9AE repeater (444.550 + PL114.8)
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