Eric Lemmon WB6FLY gave the best response to my question of how
common is it to place a bandpass fillter betweeen antenna and
duplexer. Most assumed a ham repeater with tx circulator and high
rejection pass/reject duplexer which is correct.
As I read the resposes it seems the answer is: this
--- w7aor [EMAIL PROTECTED] wrote:
Eric Lemmon WB6FLY gave the best response to my
question of how
common is it to place a bandpass fillter betweeen
antenna and
duplexer. Most assumed a ham repeater with tx
circulator and high
rejection pass/reject duplexer which is correct.
About
Hi all,
This topic is very well described in an article (on Kevin's website) by
Jacques Audet VE2AZX. It is a large file but well worth the time
downloading. You will find an excellent explanation of the various types
of duplexers in which, at the end, he recommends this discussed
Ken Arck wrote:
At 05:54 PM 7/21/2005 -0700, you wrote:
I would not put a BP cavity between the duplexer and the antenna, simply
because such a cavity would diminish the function of the duplexer.
---Gotta disagree with you here, Eric. Depending on the underlying
problem, the addition
At 10:20 AM 7/22/2005 -0400, you wrote:
Sorry, Ken-look at that again. One doesn't normally put a cavity between
the output of the duplexer and the antennait would have to be broad
enough to pass both tx and rx.
---Ooops! Didn't catch the between duplexer and antenna part (that's what
I
Ken Arck wrote:
At 10:20 AM 7/22/2005 -0400, you wrote:
Sorry, Ken-look at that again. One doesn't normally put a cavity between
the output of the duplexer and the antennait would have to be broad
enough to pass both tx and rx.
---Ooops! Didn't catch the between duplexer and
DCI Makes filters for 2m/220/440 there bandwith is ONLY the amateur band. Pre-tuned they work very well for intermod rejection while passing both the TX/RX frequencies.
Andy KC2GOW
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At 08:17 PM 7/21/2005 -, you wrote:
How common is it to use a band pass filter ahead of a pass-reject
duplexer, i.e., between the duplexer and feed line to antenna. Any
reason for adding a band pass filter there on antenna input to
duplexer vs. between the preamp pre selector cavities
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED] wrote:
Without much fear of contradiction, I will state that a
bandpass/bandreject duplexer has precious little bandpass effect.
Sure,
when you look at a response plot that covers 10 MHz, it may look very
selective, but
At 05:54 PM 7/21/2005 -0700, you wrote:
I would not put a BP cavity between the duplexer and the antenna, simply
because such a cavity would diminish the function of the duplexer.
---Gotta disagree with you here, Eric. Depending on the underlying
problem, the addition of a single BP cavity can
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