[CQ-Contest] A3S or TH3JR or....a QUAD!

[David Pruett]

K9TM and I used a GemQuad kit for the 20-15-10 antenna at the little 
station we've assembled down on St. Croix, and we have been very pleased 
with it's performance.  However, we found through computer modeling that 
GemQuad's element lengths are not correct.  We modified GemQuad's 
lengths in K6STI's NEC-for-Wires program to get the F/B and SWR centered 
on the band, then we built the quad with those lengths and the SWR curve 
is very, very close to the model prediction.  The antenna has been up 
now for almost two years and has produced two world top 10s in the 
multi-single category of WPX SSB and the #2 SOHP score in SS phone.  Not 
bad for an antenna with an 8' boom.

The GemQuad hardware (spreaders and mounting spiders) appear substantial 
and of good quality.  Like any quad, wire flexing at the corners had to 
be addressed, but so far we've been very happy with the antenna.

Dave/K8CC


Dan Violette wrote:
> Looks like GemQuad is still available out of Canada:
> http://www.gemquad.com/ 
> Boomless Quad and an excellent performer, I used for many years in the 80's.
> Each band more optimally spaced in this arrangement.
>
> Dan KI6X
>
> -----Original Message-----
> From: cq-contest-bounces at contesting.com
> [mailto:cq-contest-bounces at contesting.com] On Behalf Of N7MAL
> Sent: Saturday, August 25, 2007 3:54 PM
> To: Dale Putnam; kr2q at optonline.net; cq-contest at contesting.com
> Subject: Re: [CQ-Contest] A3S or TH3JR or....a QUAD!
>
> Dale have you looked at Cubex.?.?.?. Since lightening bolt went out of
> business Cubex is the only mfr left...
> again my -2cents worth
> 73
>
>
> MAL
> N7MAL
> BULLHEAD CITY, AZ
> http://www.n7mal.com
>
>   ----- Original Message ----- 
>   From: Dale Putnam
>   To: kr2q at optonline.net ; cq-contest at contesting.com
>   Sent: Saturday, August 25, 2007 13:37
>   Subject: Re: [CQ-Contest] A3S or TH3JR or....a QUAD!
>
>
>
>   Now you're talking... the best 20-10 mtr antenna had here has been a 2 el.
>
> Hy-gain 244 quad,
>   have been looking for another for a long time... since the tower came down
>
> after a guy line failure, in near 100 mph wind. Have new tower, need 244 for
>
> top. The quad out performed the three ele yagi, almost every time, only 
> exception is when working close in. and not backscatter.
>   That was better with the quad.
>   --... ...--Dale - WC7S in Wy
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