On Sun, 11 Oct 2009, Jacob Suter wrote:
I thought the prefered poor-man's repeater antenna was a J-pole?
Single folded dipole IMO.
Out of curiosity - are the 'square dipole' (or 'gapped loop' or whatever
they want to call them) antennas usable for repeater use? Example:
Buy a commercial one and cry once.
Failing to have the funds you may want to build a colinear out of coax
sections. It don't get much cheaper than that.
http://www.repeater-builder.com/antenna/wa6svt.html
tom
[Original Message]
From: W3ML w...@arrl.net
To:
W3ML wrote:
Hi again,
We are looking to replace that used antenna after getting 100 feet of new
Andrews 1/2 donated to our club.
Now I realize that the DB type antenna is the best, but we do not have 800
bucks to buy one.
So, my question is should we just get a new G7-144 to replace the
John,
It sounds like you already have a G7? How old is it and how does it
operate? I am trying to figure out how it stood up to your WX Elements. My
two cents
.In WNY on the highest hill in Allegany County I had and still
have a G7. I had it up for about seven years at 160 until I got a used
John,
My suggestion is simple: Find the money to buy a decent antenna. Unless
your time has no value, your gasoline is free, and you enjoy tower climbing,
don't mess with cheap antennas.
The great majority of available funds should go into the antenna, feedline,
and outdoor mounting hardware-
On Sun, 11 Oct 2009, Thomas Oliver wrote:
Buy a commercial one and cry once.
What he said. Give until it hurts, but a DB-224 or a Super Stationmaster
with upper brace are a necessity in environments where ice damage is a
possible. Do it once, do it right.
Or do it every week/month/year. Are
Kris Kirby wrote:
On Sun, 11 Oct 2009, Thomas Oliver wrote:
Buy a commercial one and cry once.
What he said. Give until it hurts, but a DB-224 or a Super Stationmaster
with upper brace are a necessity in environments where ice damage is a
possible. Do it once, do it right.
Or do it
.
David
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon
Sent: Sunday, October 11, 2009 11:45 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Antenna question
John,
My suggestion
How much line loss do you have? It could simply be an open at the connector
on the antenna end. Try checking with an ohmmeter on the ground. It should
show as a short from the center pin to the connector shell.
Chuck
WB2EDV
- Original Message -
From: Ian Miller [EMAIL PROTECTED]
To:
I have seen problems with using analyzers on dipole arrays, hopefully the
bridge will give you a better report. Also might be an open connector as
mentioned.
Don Kirchner
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Ian Miller
Sent: Friday, September 05,
--- On Fri, 9/5/08, Ian Miller [EMAIL PROTECTED] wrote:
From: Ian Miller [EMAIL PROTECTED]
Subject: [Repeater-Builder] Antenna question
To: Repeater-Builder@yahoogroups.com
Date: Friday, September 5, 2008, 9:43 AM
Our group has a Sinclair 8 dipole array for UHF.
The repeater was
Ian,
As some others have pointed out, I too have seen a little odd response
from the MFJ analyzer too. I very recently used one to toy around with
several DB420 antennas. The MFJ wasn't wrong really, but it did not
give the same response that two different SWR/Wattmeters powered by
two
Impedance is impedance. The MFJ analyzer should be as accurate for that antenna
as any other.
However, the analyzer's signal is very small, and at any site where other
transmitters are nearby, the analyzer's internal SWR bridge can be fooled by
signals other than its own, leading to erroneous
For what it's worth, I'll add my two cents:
After assembling and tuning a 2 meter Ringo antenna, I wiped it down with
rubbing alcohol and then sprayed it with urethane spar (marine) varnish, which
I bought at K-mart. I used an entire can (12 ounces maybe). The antenna
performed well through
On Sun, 4 May 2008, Bruce Bagwell wrote:
OK guys, along this same line, I have a VHF all copper J-Pole and plan
on building UHF all copper J-pole. Is common clear lacquer OK to
prevent corrosion on the copper elements? I have used automotive type
black silicone under 2 wide electrical tape
At 08:44 AM 05/01/08, Ron Wright, N9EE wrote:
(big chunk cut out)
One other plus for
folded dipole antennas, the fiberglass antennas are much more prone to
become toothpicks with a lightning strike where a 224 will most likely
survive.
Plus in windy areas they need a top support to prevent
At 5/3/2008 11:44, you wrote:
At 08:44 AM 05/01/08, Ron Wright, N9EE wrote:
(big chunk cut out)
One other plus for
folded dipole antennas, the fiberglass antennas are much more prone to
become toothpicks with a lightning strike where a 224 will most likely
survive.
Plus in windy areas
hi all,
I am about to replace a DB224 side mounted at 1175 ft above ground. The
antenna is close to the Gulf, 0.5 mi, and think the salt air got to it. It has
been up about 12 years and now has an SWR of 2:1. The coverage is very
noticeably less.
I am thinking of a Super Station Master
] On Behalf Of Ron Wright
Sent: Thursday, May 01, 2008 9:39 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] antenna question
hi all,
I am about to replace a DB224 side mounted at 1175 ft above ground. The
antenna is close to the Gulf, 0.5 mi, and think the salt air got
for
install. All of what you did was done, but not sure about this antenna.
73, ron, n9ee/r
From: Paul Finch [EMAIL PROTECTED]
Date: 2008/05/01 Thu AM 10:44:37 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] antenna question
Ron,
I am a big proponent of the DB line
Paul Finch wrote:
I have posted this several times on R/B and will do it again. When you get
Maybe it should be an article? :-)
Nate WY0X
to think on the DB224 or Station Master. I like
both, but lean toward the Station Master.
73, ron, n9ee/r
From: Paul Finch [EMAIL PROTECTED]
Date: 2008/05/01 Thu AM 10:44:37 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] antenna question
Ron,
I am a big proponent
: RE: [Repeater-Builder] antenna question
Ron,
I am a big proponent of the DB line of antennas but I also add that they
must be set up correctly before they are installed, especially in a high
humidity/salt air environment like you are talking about. The following is
what I learned form the two
Ron Wright wrote:
I'm giving myself about a week to think on the DB224 or Station Master. I
like both, but lean toward the Station Master.
Heh, my usual comment... everyone will be expecting this one...
Have you considered a Sinclair with the harness internal to the antenna?
I still think
Subject: Re: RE: [Repeater-Builder] antenna question
Paul,
I talked with my friend about the DB224. He said as you did. When you get
it you have to tighten the hardware. Some was more than finger loose. This
is for all antennas, but more for DB Products.
He has used the Scotchkote. He likes
Nate,
My problem is not the harness, but the exposed dipoles.
73, ron, n9ee/r
From: Nate Duehr [EMAIL PROTECTED]
Date: 2008/05/01 Thu PM 07:00:56 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] antenna question
Ron Wright wrote:
I'm giving myself
: [Repeater-Builder] Antenna Question
It depends on band, split, power, and antenna gain.
On Tue, 22 Apr 2008 02:00:23 -
Christopher Hodgdon HYPERLINK
mailto:chris.hodgdon%40kaufman-ares.org[EMAIL PROTECTED]
wrote:
We are looking at setting up a basic (I know there is no
such thing
At 07:00 PM 04/21/08, you wrote:
We are looking at setting up a basic (I know there is no such thing)
repeater. What I need to know, if you do not have a duplexer to run
your antenna through, but have two antennas, with one on the TX and
one on the RX how far apart do they have to be to be able
It depends on band, split, power, and antenna gain.
On Tue, 22 Apr 2008 02:00:23 -
Christopher Hodgdon [EMAIL PROTECTED]
wrote:
We are looking at setting up a basic (I know there is no
such thing)
repeater. What I need to know, if you do not have a
duplexer to run
your antenna
Christopher,
According to my CommShop program, a 144 MHz repeater with a 50 watt
transmitter and a receiver having 0.3 uV sensitivity will require around 90
dB of isolation to avoid desense with a typical receiver. That isolation
can be achieved with about 220 feet of vertical separation or
There is a DB224 with internal harness. Not made for Ham band, but for
150-160, etc.
73, ron, n9ee/r
From: Larry Wagoner [EMAIL PROTECTED]
Date: 2008/03/24 Mon PM 05:41:52 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Antenna question
At 05:37 PM
7:57 AM
Subject: Re: Re: [Repeater-Builder] Antenna question
There is a DB224 with internal harness. Not made for Ham band, but for
150-160, etc.
73, ron, n9ee/r
From: Larry Wagoner [EMAIL PROTECTED]
Date: 2008/03/24 Mon PM 05:41:52 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re
At 10:07 AM 3/25/2008, you wrote:
Maybe that's what he has, even though he said it wasn't a DB products. But
he said antenna rod, not tubing. Was that particular model made with rod?
Chuck - have been told by someone else that it is a Sinclair. I can
find no tag or ID on it that tells me that
You may have something else. The SRL-224 has an external harness.
Chuck
WB2EDV
- Original Message -
From: Larry Wagoner [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, March 24, 2008 6:09 PM
Subject: [Repeater-Builder] Antenna question
I have what may see to
At 05:37 PM 3/24/2008, you wrote:
You may have something else. The SRL-224 has an external harness.
Hmmm - this thing has a harness interior to the mast and which runs
through the center of the arms which hold the bays.
Ideas?
Larry
N5WLW
Sent: Monday, March 24, 2008 6:41 PM
Subject: Re: [Repeater-Builder] Antenna question
At 05:37 PM 3/24/2008, you wrote:
You may have something else. The SRL-224 has an external harness.
Hmmm - this thing has a harness interior to the mast and which runs
through the center of the arms which
At 05:48 PM 3/24/2008, you wrote:
Is there a blob of heat-shrink tubing at the middle of the element -
furthest away from the mast?
Nope - just aluminum rod
Larry
N5WLW
At 05:48 PM 3/24/2008, you wrote:
Is there a blob of heat-shrink tubing at the middle of the element -
furthest away from the mast?
One other thing ... the arms holding the dipole away from the mast is
only about 8 inches long - and extends to both the inside and outside
of the dipole.
Not
Subject: Re: [Repeater-Builder] Antenna question
At 05:48 PM 3/24/2008, you wrote:
Is there a blob of heat-shrink tubing at the middle of the element -
furthest away from the mast?
Nope - just aluminum rod
Larry
N5WLW
Than it's not a SRL-224. On those, the element attaches directly to the mast
(and the harness is external).
Chuck
WB2EDV
- Original Message -
From: Larry Wagoner [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, March 24, 2008 7:36 PM
Subject: Re: [Repeater-Builder
Hi Steve,
First, avoid using LMR-400 for duplex use. This and 9913 are not good
for duplex. Aluminum shield and tinned copper braid rubbing together
and setting up corrosion causing noise. This is not a very long run,
try and get some 1/2 hardline, you will not be disappointed. Spend
At 02:24 PM 2/1/2008, you wrote:
Hi Steve,
The Diamond and Comet antennas will probably only last one or two
seasons in your weather! I could write two pages of faults in
construction on these brands. Just not build sturdy enough. They don't
last long here in Michigan. I am in the Detroit
If either takes a lightning strike the fiberglass will explode. I have had
that happen with both.
Check into Tram antennas. they seem electrically and mechanically similar to
the diamond but are a lot cheaper!
WB5OXQ
- Original Message -
From: w2sxk
To:
: Saturday, January 26, 2008 2:59 PM
Subject: Re: [Repeater-Builder] Antenna question for the forum.
If either takes a lightning strike the fiberglass will explode. I have had
that happen with both.
Check into Tram antennas. they seem electrically and mechanically similar to
the diamond
You'll hear this from others -- DO NOT use the LMR-400 cable in duplex
situations.
This subject comes up about every other week here.
Chuck
WB2EDV
- Original Message -
From: w2sxk [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, January 25, 2008 4:43 PM
Subject:
Hi Rod,
That antenna we started using for our Passport system here in Oregon and had
many problems with the antenna. It will eventually fail you. We use
exclusively the Telewave ANT150D antenna have had NO problems.
Mike
Oregon Repeater Linking Group
Mike Mullarkey
-Original Message-
If you have your wind averages sticking a Big ole stick in the sky I found
this web site useful in planning wind loads.
try http://www.championradio.com/tn-topten-mistakes.html
Good place for anyone to start.
I searched MSN and used the words Radio + Antenna + Wind + Load
there is some stuff
Sinclair makes excellent dipoles. We switched to them several years ago
and never looked back.
http://www.sinctech.com/
Mike
K6MJU
OK.
One of the repeaters I help maintain (145.170 located in
Connellsville, PA on the mountain) recently lost an antenna in the
wind storms that hit us
Yes they do.
Chuck
WB2EDV
- Original Message -
From: mike [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, December 21, 2004 3:42 PM
Subject: Re: [Repeater-Builder] antenna question for 2M ham. . .
Sinclair makes excellent dipoles. We switched to them
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