Well Tim, that is going to be real close to 3/4 wave length at your
freq. assuming a .66 prop facter like RG214. Still It would never
hurt to have a matching device between the Tx and the duplexer.
Normally it would be in the form of a pi network for the band in
question. They are easy to
As I stated a few times here I have a duplexer that has been giving me
desense. To get rid of the desense I turned down the TX power until it went
away because the duplexer is rusty and hasn't been messed with in 20+ years.
I came across another duplexer in a base station cabinet we had and
Tim, a couple of questions come to mind.
1.) Are you trying to tune a T-band Duplexer down to
440? Not reccomended.
2.) Are you running a circulator between the duplexer
and the antenna?
3.) Are you using the same cables out of the repeater
to connect to the duplexer (either one) and seeing a
On Thursday 30 September 2004 02:16 am, Tim S. wrote:
However, I put the service monitor on the PA output and
read 42 watts. Hooked the cabling up to the duplexer and
then checked the output of the duplexer and only read 22
watts. That's like a -2.8db loss.
What is the SWR looking into the
it
would be to replace that connector, I am guessing it was riveted in during
production.
MH
- Original Message -
From: Tim S. [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, September 30, 2004 2:16 AM
Subject: [Repeater-Builder] The duplexer story...
As I stated
At 12:09 AM 9/30/2004 -0700, you wrote:
Tim, a couple of questions come to mind.
2.) Are you running a circulator between the duplexer
and the antenna?
--???
Ken
--
President and CTO - Arcom
Comments within...
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Tim, a couple of questions come to mind.
1.) Are you trying to tune a T-band Duplexer down to
440? Not reccomended.
No I am not trying to make it go to ham band. I maintain a private tband
-Original Message-
From: Paul Kelley [mailto:[EMAIL PROTECTED]
What is the SWR looking into the duplexer?
Did not check that. What should it be? I assume 10% or less reflected.
Have you tried
different length cables from the transmitter to the
duplexer and looked to see if the power
Tim S. wrote:
-Original Message-
From: Paul Kelley [mailto:[EMAIL PROTECTED]
What is the SWR looking into the duplexer?
Did not check that. What should it be? I assume 10% or less reflected.
4% is 1.5:1 (100W out - 4W back OR 50W out - 2W back)
It should be no more at the TX
Thanks Joe.
I'll check that out.
-Tim
-Original Message-
From: mch [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 30, 2004 10:44 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] The duplexer story...
Tim S. wrote:
-Original Message-
From: Paul
What is the SWR looking into the duplexer?
Did not check that. What should it be? I assume 10% or
less reflected.
Ideally it should be not much higher than the antenna SWR,
but even if SWR into the duplexer is low, duplexers can
look reactive and cause some PAs to act up. And even a
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