So how do you know your antenna is not performing as it should? When an
antenna has a corrosion problem, can it still have good VSWR? I think it
can. A resistor can have good VSWR. So what should I do to find out
whether I need a new antenna?
I'd like to benefit from your experience. Thanks for an
found anything better in the Texas sun.
Paul
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of John Transue
Sent: Saturday, May 03, 2008 8:52 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: antenna question
So how do you
Nitto make a very good roll of malable self sealing rubber tape which works
very well and is moderately priced .
To: Repeater-Builder@yahoogroups.com
From: [EMAIL PROTECTED]
Date: Sat, 3 May 2008 21:54:05 +
Subject: [Repeater-Builder] Re: antenna question
D] On Behalf Of Paul Finch
Sent: Saturday, May 03, 2008 11:31 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: antenna question
John,
By all means it can, I have seen a good dummy load DB224 antenna several
times. It had fairly good reflected reading but like I
John Transue wrote:
> I'm afraid there is no easy way to evaluate an antenna except from
> signal reports. Even if you have a field strength meter, which I do not
> have, the reading would only be relative except on a calibrated test
> range.
>
> Thanks for sharing your experience with me.
>
d8chl
Sent: Thursday, May 08, 2008 3:59 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: antenna question
John Transue wrote:
> I'm afraid there is no easy way to evaluate an antenna except from
> signal reports. Even if you have a field strength meter
No, this is VERY typical. The antenna is bad.
Chuck
WB2EDV
- Original Message -
From: "W3ML"
To:
Sent: Sunday, October 11, 2009 1:15 PM
Subject: [Repeater-Builder] Re: Antenna question
It still wobbles and I believe there is something wrong inside the
fiber-glassed section and tha
Agreed. This is a classic sign of an antenna that's gone bad, and unless
you've got a good isolator with sufficient load you're probably doing
bad things to your transmitter... not to mention all the noise you're
likely generating for other site users when you're transmitting.
Needs to be repla
At this point, you've got a the smoking gun. It's as good as DNA ;-)
Chuck
WB2EDV
- Original Message -
From: "W3ML"
To:
Sent: Sunday, October 11, 2009 2:33 PM
Subject: [Repeater-Builder] Re: Antenna question
> That is the conclusion that I have come to as everybody has said that GE
After installing some Hustler Spirit HD antennas in snow and ice conditions,
and visiting the site to see several inches of radial ice everywhere, I
became a dealer for them.
They are built after the order to frequency. I ordered a 420 9 dB HD Omni,
and a 440 9 dB Omni, and the 420 antenna w
You all (well, everyone who's been here a while) know my general
loathing for fiberglass stick antennas, since our lightning here
turns them into pretty white bits of fiberglass blowing around
the top of the mountain by the time you realize something's wrong
with the repeater...
But... after all t
and
keep em running—let someone else use them!
Andy W6AMS
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Nate Duehr
Sent: Monday, October 12, 2009 4:12 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Antenna question
I’d like to chime in here as well…
I also agree that your first venture into repeaters should be as an assistant
Trustee (or something similar) for your local ham club. Doing this will help
you gain necessary experience and knowledge before you try to venture on your
own. It will also allo
eater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Antenna question
You all (well, everyone who's been here a while) know my general loathing
for fiberglass stick antennas, since our lightning here turns them into
pretty white bits of fiberglass blowing around the top of th
G7-144 top-mounted at 60 feet for four years.
I would watch the wobble when the wind blew and
heard the crackling. I thought the lower phasing
coil had worked loose at the studs. Not so.
When I brought it down I discovered the four pins
at the both the top and bottom of the lower phasing
coil
Boy, you took a gamble. I'd have been afraid that this action could have
either messed up the VSWR or shifted the resonant point of the antenna. Then
again, maybe it did and either you don't know that or it wasn't significant.
Chuck
WB2EDV
- Original Message -
From: "skipp025" <[EMAIL
Paint a polythene cup with your favourite antenna covering. Let it dry and put
it into the microwave oven along with a cup of water (to act as a dummy load)
Cook for 1 min on max power.
If it gets even slightly warm its no good for antennas.
er.. can I please have an award for the first cooking
The problem with high loss tangent is that you'd never see it as reflected
power. You could lose 3 dB or more & never know it.
Bob NO6B
At 5/4/2008 04:53, you wrote:
>Boy, you took a gamble. I'd have been afraid that this action could have
>either messed up the VSWR or shifted the resonant poi
At 5/4/2008 07:44, you wrote:
>Paint a polythene cup with your favourite antenna covering. Let it dry and
>put it into the microwave oven along with a cup of water (to act as a
>dummy load)
>Cook for 1 min on max power.
>If it gets even slightly warm its no good for antennas.
>
>er.. can I plea
Fine except for one problem. Water is an excellant absorber of the
microwaves used in the microwave ovens (2.45 GHz) So your water will
heat up quickly irregardless of the coating. The only substances that
are better absorbers of that frequency are animal or vegetable fats
because they conta
@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote
Paint a polythene cup with your favourite antenna covering. Let it dry and
put it into the microwave oven along with a cup of water (to act as a dummy
load)
Cook for 1 min on max power.
If it gets even slightly
But if it passed at 2.4 GHz it would probably be great for VHF.
Paul
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of skipp025
Sent: Sunday, May 04, 2008 10:05 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re:
You don't care if the cup of water heats up - you are looking to see if
the painted cup heats up. The water is only there to prevent burning out
the microwave.
Joe M.
Burt Lang wrote:
> Fine except for one problem. Water is an excellant absorber of the
> microwaves used in the microwave ovens
Think about it. If you expect the water to act as a heatsink, it would
require the cup to transfer heat thru its material. Heat can go both
ways and you will never know if heat generated on the outside is heating
the water or vice versa, the water is passing thru the cup to the
outside. Put
Sorry Joe, I misunderstood the original procedure. I can see the
purpose of the water now although I still don't believe that an empty
oven will burn out easily. If that was true, most of the ovens in the
country would now be dead because most everyone is guilty of turning on
one with little
al Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, May 04, 2008 10:29 AM
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
The problem with high loss tangent is that you'd never see it as reflected
power. You
Uh...Burt, I think he meant water in a separate cup. Faked me out at first, too!
- Original Message -
From: Burt Lang
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, May 04, 2008 1:58 PM
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
Fine
>Cook for 1 min on max power.
>If it gets even slightly warm its no good for
>antennas.
Hi all. Here in Yakima Washington, I have supplied
Hams with pcs. of corean (counter top material) to
use as an insulator in their antenna projects. We have
done the same test in the microwave. It stays coo
At 5/4/2008 12:58, you wrote:
>Fine except for one problem. Water is an excellant absorber of the
>microwaves used in the microwave ovens (2.45 GHz) So your water will
>heat up quickly irregardless of the coating.
Yes, but the idea is that the cup of water (load to keep the magnetron
happy) is s
No need to be sorry.
As for not operating it without a 'load', I would prefer to not take the
chance. Think of it as cheap insurance.
I'm sure a lot of people have put metal in them, too, but that too is
not a good idea.
Joe M.
Burt Lang wrote:
> Sorry Joe, I misunderstood the original proced
So what color(s) did you use to camouflage them?
Joe M.
Scott Overstreet wrote:
>
> Hello All
>
> A couple of years ago I needed to camoflodge several new fiberglass
> antennas. I investigated spray can paints at the local home store and
> came up with Rustolum's specialty "Paint For Plasti
Lite and dark green purposely splotchy.
- Original Message -
From: MCH
To: Repeater-Builder@yahoogroups.com
Sent: Monday, May 05, 2008 11:20 AM
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
So what color(s) did you use to camouflage
<[EMAIL PROTECTED]>
>Date: 2008/05/04 Sun AM 06:53:49 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>
>Boy, you took a gamble. I'd have been afraid that this action could have
>eit
9 AM
Subject: Re: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote
> Coating, painting, etc of antenna elements has always been in question.
> Some don't like using insulated wire for HF dipoles although think this
> has long been resolved and is no prob
yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>
>Think about it. If you expect the water to act as a heatsink, it would
>require the cup to transfer heat thru its material. Heat can go both
>ways and you will never
Funny you should mention Krylon... although I haven't done so in recent
years, I used to Krylon (clear) all antennas and never had a problem. I
forgot all about that until your mention of it. And they were mostly UHF
antennas - beams and folded dipoles. Go figure.
Chuck
WB2EDV
- Original
-Builder] Re: antenna question - Dip It and Scotch
Kote and Krylon
Funny you should mention Krylon... although I haven't done so in recent
years, I used to Krylon (clear) all antennas and never had a problem. I
forgot all about that until your mention of it. And they were mostly UHF
antennas -
I painted a refurbished, retuned UHF StationMaster with white Krylon spray
paint. Checked VSWR & signal strengths before & after: no change.
Bob NO6B
At 5/4/2008 06:52, you wrote:
>Funny you should mention Krylon... although I haven't done so in recent
>years, I used to Krylon (clear) all ante
Skip,
The last time I was in Ontario, CA, about 50 miles east of LA, much of the time
we could not see a 5000 ft mountain 2 miles away. Was there with fellow
engineer and he was looking for something to take a picture of so he could show
his wife. We told him about the mountain and he had not
This topic reminds me, a friend said he painted his copper J Pole, and it
never worked after that.
The type of paint, and other factors determine what is and what is not
safe to use on an antenna.
The only thing I have done is used a tad of NoAlox in joints on antennas.
Years ago, I did
Dick,
This discussion of weather proofing an antenna was started in part because I am
replacing a 4 bay DB224 up high and near the Gulf of Mexico. We think the salt
air got to it. We have had similar problems in the past. The antenna has been
up for about 12 years.
I was looking for a solut
I haven't had as many problems with lightning and the fiberglass
antennas as I have with wind causing fractures in the connections
between the elements. In the case of the coasts, you have to deal with
that AND salt, so I doubt there is any good solution.
The above said, I do believe the 224 ty
stance from the tower is non-resonant at your operating frequency.
Hope this helps.
Dick W1NMZ
Manager (Retired)
Electromagnetic Engineering and Test
Lockheed Skunk Works
- Original Message -
From: Ron Wright
To: Repeater-Builder@yahoogroups.com
Sent: 07 May, 2008 11:10
Subject: Re: [Rep
ocwarren2000 wrote:
> Er.. uh... Excuse me, but why all this commotion about painting
> and preserving antennas???
>
> If everyone used limited range, low gain, stacked folded dipoles,
> then maybe so, but stacked folded dipoles are a low gain limited
> range item.
A 4-bay stacked dipole
: Repeater-Builder@yahoogroups.com
Sent: Thursday, May 08, 2008 1:53 PM
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
and Kry
ocwarren2000 wrote:
> Er.. uh... Excuse me, but why all this commotion about painting
> and preserving antennas???
>
t: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote and Kry
ocwarren2000 wrote:
> Er.. uh... Excuse me, but why all this commotion about painting
> and preserving antennas???
>
> If everyone used limited range, low gain, stacked folded dipoles,
> then maybe so, but st
--- On Fri, 5/9/08, Laryn Lohman <[EMAIL PROTECTED]> wrote:
> From: Laryn Lohman <[EMAIL PROTECTED]>
> Subject: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote and
> Kry
> To: Repeater-Builder@yahoogroups.com
> Date: Friday, May 9, 2008, 12:09 AM
> --- In Repeater-Builder@yaho
Paul Finch wrote:
> Actually I looked up the Super Stationmaster and and they have one
> that's rated at 9 DB at VHF.
dBi or dBd? Very important. "DB" is a useless number without that
third letter when rating antennas. (GRIN)
I'd say generally that what you're describing is not physically
p
ilder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote and Kry
Paul Finch wrote:
> Actually I looked up the Super Stationmaster and and they have one
> that's rated at 9 DB at VHF.
dBi or dBd? Very important. "DB" is a useless
On May 9, 2008, at 9:13 PM, Laryn Lohman wrote:
> --- In Repeater-Builder@yahoogroups.com, "Paul Finch" <[EMAIL PROTECTED]>
> wrote:
>>
>> Do a Google search for yourself, it's the first result that comes
> up. The
>> DB-228 is the same way, it about 44 feet long overall.
>>
>
>> Paul Finch wrot
Paul
___
From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-
[EMAIL PROTECTED] ups.com] On Behalf Of Nate Duehr
Sent: Friday, May 09, 2008 12:26 PM
To: Repeater-Builder@ yahoogroups. com
Subject: Re: [Repeater-Builder] Re: antenna question - Dip I
At 5/10/2008 04:36, you wrote:
>Paul,
>
>This length always leads me to telling Hams that the 17 ft Comet does not
>have the 8+ dbd gain the package says.
I don't recall the package saying dBd, but their website clearly indicates
8.5 dBi @ 146 MHz.
BTW, I measured the gain of the GP9 @ 440 MHz
Dang, must have misread something. Was in a hurry, link below
Paul
HYPERLINK
"http://www.ke3ht.org/14691/specsheet_220-2n.pdf"http://www.ke3ht.org/14691/
specsheet_220-2n.pdf
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Laryn Lohman
Sent:
@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote and Kry
Dang, must have misread something. Was in a hurry, link below
Paul
HYPERLINK
"http://www.ke3ht.org/14691/specsheet_220-2n.pdf"http://www.ke3ht.-org/14691
/-specsheet_-
Paul Plack wrote:
> Actually, in theory, a fiberglas-enclosed colinear array fed from one
> end requires more elements and length to equal the gain of an
> otherwise comparable colinear array fed at each element. The upper
> elements of a Stationmaster are seeing less RF current than the ones
> clo
;Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>and Krylon
>
>Funny you should mention Krylon... although I haven't done so in recent
>years, I used to Krylon (clear) all antennas and never had a problem. I
>forgot all about that unt
;From: Ron Wright <[EMAIL PROTECTED]>
>Date: 2008/05/04 Sun PM 02:30:13 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
>Kote and Kry
>
>This painting of antennas seems to be on many of our min
hi all,
I've been looking at the Telewave ANT150F6-2, 144-151 MHz fiberglass collinear
antenna for Ham repeater at 1175 ft above ground. I think Telewave's version
of the Super Station Master. Spec sheet at
http://www.telewave.com/pdf/TWDS-7020.pdf
The spec says it is 6 db gain and it is 256
Hello All
A couple of years ago I needed to camoflodge several new fiberglass antennas. I
investigated spray can paints at the local home store and came up with
Rustolum's specialty "Paint For Plastic"---that's what it says in headline form
on the can and it also says "Direct--To--Plastic--Pain
8:38 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>and Kry
>
>Ron and gang:
>
>As Dick W7TIO noted, the antenna should be selected based on the desired
>coverage range of
>the rptr.
ld be preferred.
Thanks for you input.
73, ron, n9ee/r
>From: MCH <[EMAIL PROTECTED]>
>Date: 2008/05/07 Wed PM 02:12:33 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>and Kry
>
&g
amage.
Paul
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Thursday, May 08, 2008 7:03 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote and Kry
Joe,
I agre
om
>Subject: RE: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
>Kote and Kry
>
>Ron, Remember that lightning not only hits the top of the tower but can come
>back off the tower and hit something else in it's way, I think I heard in
>aroun
eater-Builder@yahoogroups.com
Subject: RE: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch
Kote and Kry
Ron,
Remember that lightning not only hits the top of the tower but can come back
off the tower and hit something else in it's way, I think I heard in around
150 foot
TED]>
>Date: 2008/05/09 Fri PM 12:26:26 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and Scotch Kote
>and Kry
>
>Paul Finch wrote:
>> Actually I looked up the Super Stationmaster and and they ha
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