kc4ih [EMAIL PROTECTED] wrote:
After much head scratching I believe that the
difference in frequency of the pager transmitter
of 600 khz is the problem
Head scratching doesn't provide real answers. Are
the paging transmitters running circulators? Are
they licensed for the rated power
and see if it helps any.
- Original Message -
From: mch [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, October 03, 2004 7:11 PM
Subject: Re: [Repeater-Builder] Intermod problem? Yes!
By that statement, you are saying that the 146.670 repeater is
coordinated
Q,
I had a IM problem several years ago with our 146.940
repeater. The repeater was a GE MastrII station with a
dual isolator on the transmitter and a bandpass
bandreject duplexer. The antenna was a Sinclair SRL229
mounted to a 40 Ft wood pole. The other transmitters
found in the IM mix were AM
if it helps any.
- Original Message -
From: mch [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, October 03, 2004 7:11 PM
Subject: Re: [Repeater-Builder] Intermod problem? Yes!
By that statement, you are saying that the 146.670 repeater is
coordinated? If so, what
Trying to troubleshoot an intermod??? problem between two repeaters. The
146.10/.70 repeater's receiver gets blasted by the 147.90/.30 transmitter
but only when they are both transmitting. Yes,the transit freqs are 600khz
apart and they are only 5 miles apart. Would a circulator help this
I would try one or two bandpass cavities between the duplexer and the
receiver of the victim repeater. The symptom you describe is that of
poor selectivity and possibly receiver IM. A ferrite isolator on either
transmitter won't have much effect on signals that mix in the receiver
front end.
The isolator might fix the problem. The second
harmonic of the 146.7 is 293.4. If you subtract 147.3,
it comes up right on your input, 146.1.(Classic 2A-B
intermod) Same thing is going on with the other freqs.
Could also be mixing in your RX, or about any other
non-linear spot between the two
They are all GE MastrII base stations so I dont think its a receiver
problem...
- Original Message -
From: Eric Lemmon [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, October 03, 2004 2:07 AM
Subject: Re: [Repeater-Builder] Intermod problem?
I would try one or two
I agree. We have had similar problems with 146.745 and 147.345,
146.67, and 147.27, 146.625, and 147.225 here locally. All of these
were traced to mixing in the PA stage of the repeaters. In some
instances, isolators were needed on both repeaters to eliminate the
problem totally.
Kevin
Maybe not the answer you want to hear, but have the uncoordinated
repeater (147.300 or 146.670) solve the problem. If that means moving
location farther away, so be it. ;-
As for the technical side, it may help, but it all depends on where the
mixing is happening.
Joe M.
Q wrote:
Trying to
By that statement, you are saying that the 146.670 repeater is
coordinated? If so, what is the callsign and location? eMail me
privately if you wish.
Joe M.
Q wrote:
Unfortunately,only the 147.30 is un-coordinated. Now for the
politics of the hobby...
- Original Message -
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