[Antennas] Cushcraft R8

[Robert Lay (W9DMK)]

Dear Adam,

Nice pictures.
My R7 looks similar and is mounted on an 8' pole.

73 de W9DMK - Bob Lay, Dahlgren, VA
http://www.zaffora.com/W9DMK/W9dmk.html
w9dmk at crosslink.net
----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "Antennas Reflector" <antennas at mailman.qth.net>
Sent: Thursday, May 11, 2006 2:50 PM
Subject: RE: [Antennas] Cushcraft R8


> Kurosaki-san, Bob,
>
> I have an R8 attached to the side of my house. You can see some pictures
> here:
>
> http://www.ab4oj.com/house/main.html
>
> The R8 covers 40 ~ 6m, including 30, 17 and 12m. It differs from the R7 in
> that it has only two traps; 30m and 20/17m. The traps are cylindrical
> helical resonators. The main radiator is tuned to 40m, and tuning stubs
> cover the other bands.
>
> I have my R8 mounted on a 6m mast, and the bottom of the antenna is 3m 
> above
> the roof-line of the house. Elevated mounting (3m minimum) is strongly
> recommended, to prevent detuning. As the launch angle is very low 
> (approx.16
> degrees), extreme elevation will not make much difference to overall
> performance.
>
> In general, a vertical antenna will not outperform a directional antenna, 
> as
> it has no azimuthal directivity. Its horizontal radiation pattern is
> circular.
>
> I have had my R8 since 2000, and am very happy with it. I feed it with 
> 1kW,
> and it tolerates that power level without distress.
>
> http://www.cushcraft.com/amateur/r8.htm
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
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