There can be good reasons for including a window filter with
a duplexer. Reduction of high powered signals, which are IF
Images would be one such appplication. Sometimes a plain jane
duplexer just isn't enough. Sometimes a duplexer doesn't provide
a DC return to ground, which is nice to
@yahoogroups.com
Subject: [Repeater-Builder] Re: Desense Problem on 222 MHz Repeater
This question has initiated an interesting exchange of ideas. Many
good suggestions have been provided.
The fact that the desensitization exists when operating duplex on
either of two antennas, or when using split
-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Richard Sharp, KQ4KX
Sent: Wednesday, January 30, 2008 9:06 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Desense Problem on 222 MHz Repeater
Yeah, of course you'd want to order any filter optimized
I can't imagine why you would want to put a window filter
between your duplexer and antenna line. There is much more
to be gained by putting separate band pass filters on the
tx and rx ports.
There can be good reasons for including a window filter with
a duplexer. Reduction of high
[EMAIL PROTECTED] On Behalf Of skipp025
(window filter cannon fodder)
I can't imagine why you would want to put a window filter
between your duplexer and antenna line. There is much more
to be gained by putting separate band pass filters on the
tx and rx ports.
There can be good
I can't imagine why you would want to put a window filter
between your duplexer and antenna line. There is much more
to be gained by putting separate band pass filters on the
tx and rx ports.
There can be good reasons for including a window filter with
a duplexer. Reduction of high
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Daron Wilson
Sent: Thursday, January 31, 2008 9:37 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Desense Problem on 222 MHz Repeater
(window filter cannon fodder)
I
] On Behalf Of Daron Wilson
Sent: Thursday, January 31, 2008 9:37 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Desense Problem on 222 MHz Repeater
(window filter cannon fodder)
I can't imagine why you would want to put a window filter
between your duplexer and antenna
Yeah, of course you'd want to order any filter optimized for your
application. Yes, DCI markets products for the Amateur market but they also
have a lot of products for commercial markets. I have indeed used some of
their products (HAM commercial) and have had very good results. Hi-Q
bandpass
nj902 wrote:
The industry is beginning to develop practices to deal with PIM.
Andrew has published some information regarding PIM in transmission
lines as has Amphenol with respect to PIM in connectors. See
also Intermodulation in Coaxial Connectors, RF Design, September
1996.
Doesn't
Richard Sharp, KQ4KX wrote:
which will reduce and/or eliminate any IMD issues from those sources.
DCI is one manufacturer of window filters for HAM bands (www.dci.ca
http://www.dci.ca).
Careful. I've looked over their product line and their stock filters
have published SWR numbers that
At 1/29/2008 14:43, you wrote:
nj902 wrote:
The industry is beginning to develop practices to deal with PIM.
Andrew has published some information regarding PIM in transmission
lines as has Amphenol with respect to PIM in connectors. See
also Intermodulation in Coaxial Connectors, RF
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED]
wrote:
I think you may have overlooked the fact that desense was observed
even when a dummy load was connected directly to the output of the
duplexer. That pretty much eliminates anything external to the
repeater itself,
This question has initiated an interesting exchange of ideas. Many
good suggestions have been provided.
The fact that the desensitization exists when operating duplex on
either of two antennas, or when using split antennas, combined with
the results of the other tests [minimal desensitization
-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of nj902
Sent: Friday, January 25, 2008 8:48 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Desense Problem on 222 MHz Repeater
This question has initiated an interesting exchange of ideas. Many
good suggestions
One issue may very well be the insufficient isolation considering the TX
power level. If you really want to run that much power I'd highly recommend
having bandpass filter(s) between the PA and the duplexer - this will help
reduce broadband noise from the PA. Bandpass filter(s) between the
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