[Antennas] Repeater Antenna

[Milt Jensen]

Randy,

I have installed in excess of 20 Amateur 2 Meter repeaters, 15 Amateur 440
mHz repeaters, and untold quantity of commercial 150-17- mHz and 420-470 mHz
repeaters over the last 30+ years.  Without doubt, the superior series of
base station type antennas are the Celwave fiberglass enclosed colinears.
For your environment with ice and wind loading, I recommend the model PD-620
(Storm Master).  This is a VERY heavy duty fiberglass stick that weighs
about 50 lbs besides being 21-22 feet long.  At amateur frequencies (144-148
mHz.) the antenna is conservatively rated at 4.8 dB of gain and can be
special ordered with down tilt in the radiation pattern.

Here is a URL where you can look at the product.
http://www.wiscointl.com/celwave/antennas/index.htm

Click on the Omnidirectional Fibergalss selection, then click on the
PD-200, -220, or -620 to see the three different models; regular duty, heavy
duty, and SUPER heavy duty.

If the -620 is TOO heavy duty for you, then the model PD-220 is an excellent
choice.  The model -200 is a far superior antenna compared to any "Amateur
grade" antenna but I would only use it in areas where there is no snow or
ice loading.  I have had a model -200 built by ComProdCo (see below) in
service at my company headquarters since 1966.  Still perfect except I had
to refinish the fiberglass a few years ago.

The PD in the prefix of the model numbers comes from Phelps Dodge, the
copper mining company.  The company was originally ComProdCo for
"Communications Products Company" back in the 1960s.  Phelps Dodge bought
the company and ran it for many years until the mid 1980s and that is why
all their products use good solid copper in the construction, rather than
aluminum etc.  PD sold out to Celwave but the product line still retains the
PD prefix.

Good luck.

Milt Jensen, N5IA


----- Original Message -----
From: <ac7nj@bentonrea.com>
To: <antennas@mailman.qth.net>
Sent: Friday, May 03, 2002 8:53 AM
Subject: [Antennas] Repeater Antenna


> Gentlemen:  After a little testing of our two meter repeater antenna, it
> became obvious that it had gone south.  No obvious burns or any
> indication of structural failure, but SWR had gone way high.  Therefore,
> we need to select a replacement.
>
>
>
> which antenna would you choose and why?  We have severe winds at the
> site, with modest ice loading.  The support is about 50' above ground
> (metal windmill tower) and the ground rolls off gently in the 270 degree
> area of intended coverage.  We run a GE MastrII transceiver, running
> about 30 watts out of a 4 cavity duplexer.  The previous stacked
> collinear antenna covered the area adequately, but we are looking for
> the best commercial antenna (within reason price wise) for the site.
> You may reply to me directly, or thru the reflector, as you see fit.
>
>
>
> YOUR IDEAS AND RECOMMENDATIONS, PLEASE?
>
>
>
>
>
> Randy
>
> AC7NJ
>
>
>
>
>
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