[Antennas] Repeater Antenna

2002年5月03日 15:15:45 -0400

At 08:53 AM 5/3/2002 -0700, [email protected] wrote:
>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?

Well, the best is a commercial Station Master, but they are very expensive, 
and wear out too, due to wind blown salt (in RI) and sand which etch the 
outer coating of the radome. We had one but it wore out after about 20 
years, so we replaced it with Diamond, repeater type, dual bander. We had 
two at our site, and both flooded and were unuseable after about 3 
years. So we replaced the 2 meter one with a Hustler repeater 
antenna. Cost is reasonable, and it has been up for three years without a 
hitch. It's not as high gain as the Diamond, but it is more rugged and 
doesn't have internal phasing cables and doesn't have a fiberglass radome 
like the Station Master or Diamond that can be etched with salt or 
sand. All is on the outside, so there is nothing to flood. It is on a 80' 
water tank, ground elevation 220' and it sees a lot of wind and some salt 
spray as it is about 2 miles from Narragansett Bay in Portsmouth RI, on the 
windy side of the island.
73, Chas, W1CG