At 10/3/2008 00:10, you wrote:
Here is the latest. I terminated the cable at the antenna with a dummy
load and no desense. I hooked back up to the antenna and if listen to the
receiver with the squelch
open I hear a buzz in the background of the receiver white noise audio in
addition to desense
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] LMR-400 Cable
At 10/2/2008 05:41, you wrote:
Hello Tom,
I think that the clue here is that you had desense with both the RG-213
and the LMR-400. My guess would be that there is some mismatch between
the antenna
To: Repeater-Builder@yahoogroups.com
Sent: Friday, October 03, 2008 12:10 AM
Subject: RE: [Repeater-Builder] LMR-400 Cable
Here is the latest. I terminated the cable at the antenna with a dummy
load and no desense. I hooked back up to the antenna and if listen to the
receiver
At 10/2/2008 16:06, you wrote:
Hi Tom,
As others have said, try the dummy load at the antenna end of the cable
and see if there is any desense.
Then try disconnecting the antenna input to the receiver from the duplexer
and place a dummy load on the receiver. Turn on the transmitter and
I suspect you my need hardline for that distance.
I have an interesting theory...
What if the length of coax actually were actually long enough for the tx signal
to remain on the wire while in RX mode? Probably need to be a mile long ;)
Another thought; anyone ever run seperate long cables
Tom, I don't think it is Your Coax , I use 75 Ft of LMR-400 on a 220
Repeater 130 Watt Amp G-7 I have this set up at the site and at home
for testing and Never have had a problem , I do intend to up grade to a
Better low loss Coax , But at 6 Meter 60 Ft would be fine I think
You will get
The next step in your troubleshooting would be to move that dummy load to the
other end of the coax and repeat the desense test; that checks your coax and
duplexer. If everything checks OK then move on to substituting a different
antenna. I would suggest that you construct a basic ground
There has been example after example of people replacing foil/braid cable with
heliax and the end result was elimination of the problem that you are
experiencing. Yes, there are isolated examples of people getting away with
using the foil/braid coax, but they are far and few between.
You
Hello Tom,
I think that the clue here is that you had desense with both the RG-213
and the LMR-400. My guess would be that there is some mismatch between
the antenna and the duplexer. The duplexer may be tuned for a 50
resistive ohm load, but the antenna system is presenting some other
At 10/1/2008 10:06, you wrote:
I recently put a six meter repeater (52.810/51.110) on the air here in
Anchorage, Alaska. I am feeding it with about 60 feet of LMR-400 cable
and am experiencing quite a bit of desense. I did a search for LMR-400 in
duplex operation and came across several posts
Hi Tom,
As others have said, try the dummy load at the antenna end of the cable and
see if there is any desense.
Then try disconnecting the antenna input to the receiver from the duplexer
and place a dummy load on the receiver. Turn on the transmitter and see if
you still have desense. If
: Thursday, October 02, 2008 7:14 PM
Subject: Re: [Repeater-Builder] LMR-400 Cable
Tom,
With 65 feet of cable, your feed line is very close to a resonant length at
6 m. Actually
about 3 wavelengths. If you have enough extra coax length, try winding some
of it into
a coil and see
Subject: Re: [Repeater-Builder] LMR-400 Cable
I suspect that he has notch cavity resonators. Each can is about two feet
tall, more or less. So, while eight of them take up some space, they are
not
likely as large as you envision.
Chuck
WB2EDV
- Original Message -
From: [EMAIL
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] LMR-400 Cable
I suspect that he has notch cavity resonators. Each can is about two feet
tall, more or less. So, while eight of them take up some space, they are not
likely as large as you envision.
Chuck
WB2EDV
- Original
At 10/2/2008 05:41, you wrote:
Hello Tom,
I think that the clue here is that you had desense with both the RG-213
and the LMR-400. My guess would be that there is some mismatch between
the antenna and the duplexer. The duplexer may be tuned for a 50
resistive ohm load, but the antenna system is
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