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
This painting of antennas seems to be on many of our minds.
Wonder what the antenna manufactures would recommend or what they use if any???
After you get beyond the sales person who swears their products are rock solid
and don't need painting or additional protection then you might get someone
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
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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