how much?
--- On Tue, 9/30/08, Jed Barton [EMAIL PROTECTED] wrote:
From: Jed Barton [EMAIL PROTECTED]
Subject: [Repeater-Builder] goodies for sale
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, September 30, 2008, 6:14 AM
Hey guys,
I've got an older 220 repeater
Len
Try orienting the yagi horizontally. That should increase side rejection of
the offending signal.
Jeff - - NJ5R
--- On Sun, 9/28/08, n2len [EMAIL PROTECTED] wrote:
From: n2len [EMAIL PROTECTED]
Subject: [Repeater-Builder] UHF LINK ANTENNA QUESTION HELP NEEDED!
To:
On Wed, 1 Oct 2008 12:21:41 Repeater-Builder@yahoogroups.com wrote:
Re: Radio Over Internet Protocol (ROIP) Interface
Posted by: Nate Duehr [EMAIL PROTECTED] wy0x
Tue Sep 30, 2008 4:46 pm (PDT)
Rodney Baker wrote:
Have a look at http://www.omnitronics.com.au/RadiooverIP.html
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 from users of this list and
1) yes, to everyone that suggested, UHF would be better and simpler in this
situation! Back to the original post! I DO NOT have any spare UHF units
laying around, and no budget to purchase any! The goal was to try and come up
with a solution with the parts that I have on hand!
2) 900 mhz -
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
Tom,
My first question is what is the reflected power on the antenna?
With duplexer loss I am guessing that you would have about 70 watts
out of the duplexer, anything more than a couple watts reflected could
cause problems.
Yes, the LMR series of cable is really that bad for duplexer use.
Worse
Ok since we made it back to the original question. Here are my thoughts on it.
1st. Ham rigs are a bad choice for any type of repeater, I would look hard for
used commercial rigs, especially if you want to transmit from the recieve site.
You can find some really cheap commercial gear and some
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
i was thinking a few hundred. You give me some ideas, 2 hamtronics
modules in a box, plus an scom 5K controller and an RF concepts amp.
On Sep 30, 2008, at 6:47 PM, Gilberto Del wrote:
how much?
--- On Tue, 9/30/08, Jed Barton [EMAIL PROTECTED] wrote:
From: Jed Barton [EMAIL PROTECTED]
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
[EMAIL PROTECTED] wrote:
At 10/1/2008 07:20, you wrote:
I have had good luck with 222 MHz Ringo Ranger. It is a little heavier
construction and has a reasonably flat pattern.
I don't recommend the Ringo Ranger for any duplex application. The gain is
overstated they have feedline
I also added radials to a Ringo Ranger and found it to improve the operation on
an old Progress Line tube type 2 M repeater I built back in the '70s. I built
them from aluminum ground wire and clamped them to the base of the antenna. I
found that it improved the operation of the repeater
Use an odd multiple of a 1/4 wave. Remember to take into account the length
of the loops in the cavity.
Robert / KD4PBC
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of n9wys
Sent: Wednesday, October 01, 2008 8:09 PM
To:
Robert Pease wrote:
Ok since we made it back to the original question. Here are my
thoughts on it. 1st. Ham rigs are a bad choice for any type of
repeater, I would look hard for used commercial rigs, especially if
you want to transmit from the recieve site.
That's what I said, but he took
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
1) yes, to everyone that suggested, UHF would be better and
simpler in this situation! Back to the original post! I DO
NOT have any spare UHF units laying around, and no budget to
purchase any! The goal was to try and come up with a
solution with the parts that I have on hand!
Have
I have a user's guide, if anyone wants it?
also afew Motorola SYN9760A (some type of little box with
spkr/mic/phone/pwr plugs on the back...Smooth Talker LJV171...
Nokia type HFU-2...
Don't ask me what this stuff is, if you want any of it or all,
You pay postage...I Don't want nothing for this
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
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 PROTECTED]
To: Repeater-Builder@yahoogroups.com
I have a Repeater antenna. Radio Frequency Systems,
#220-3AN Freq: 150.5-158.
New is about $3000.00 ... I'll take 1/2 plus shipping
for anyone that wants it.
.
.
http://www.rfsworld.com/dataxpress/DataSheets/?q=220-3AN
Decibel made a low band duplexer that used notches made from helical
resonators and passes made from lengths of coax. The whole thing measured
maybe 3.5 ft Hi x 2.5 ft wide x 8-10 deep and could mount on a wall. I
suspect his Sinclair is the same sort of thing. I recall talking to an
Right you are, Chuck! I have one of those Sinclair R-106G, six-cavity
low-band duplexers in my garage. Both it and its similar, eight-cavity
version are in a heavy steel cabinet that measures 18 deep, 22 wide, and
67 tall. The performance of the Sinclair six-cavity duplexer is about the
same as
Hi All,
My club has some 3-year-old VHF and UHF Vertex repeaters at a high-RF site.
A possible deal would move them to a much quieter site, and if that happens
we'll need replacements.
Members of this list have consistently shown a preference for Kenwoods, and
it appears both brands are
I'm still trying to comprehend why you would need replacements just
because a site is more quiet. If they work at the crowded site, they
should work fine at the quiet one.
Joe M.
[EMAIL PROTECTED] wrote:
Hi All,
My club has some 3-year-old VHF and UHF Vertex repeaters at a high-RF
site.
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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