[OKDXA] VU7

[Bert Aaron]

Coy,

At 75 feet the gain is 15.25 dBi at 13 degrees and 3.0 dBi at 2 degrees.

Bert  K2BA

-----Original Message-----
From: okdxa-bounces at mailman.qth.net [mailto:okdxa-bounces at mailman.qth.net]
On Behalf Of Coy Day
Sent: Saturday, December 09, 2006 11:49 AM
To: Discussion of OKDXA
Subject: RE: [OKDXA] VU7

Bert,

Did you happen to check it at 75ft?  A lot of city dwelling hams use that
as the optimum height for 20 meters.  Just curious what another 20ft would
do.

Coy
-- 
Coy Day, N5OK
20685 SW 29
Union City, OK 73090
405-483-5632

Bert Aaron wrote:
> Gene,
>
> Just ran a plot of two 5 element Yagi's, over flat terrain, one at 151
> feet
> and the other at 55 feet. According to HFTA the antenna at 55 feet has a
> gain of 15.0 dBi at 17 degrees and a gain of -0.5 dBi at 2 degrees. The
> same
> antenna at 151 feet has a gain of 15.5 dBi at 7 degrees and a gain of 7.5
> dBi at 2 degrees. That is a difference of 8.0 dB due to the change in
> height, at 2 degrees, and probably explains the problem.
>
> 73,
>
> Bert  K2BA
>
> -----Original Message-----
> From: okdxa-bounces at mailman.qth.net [mailto:okdxa-bounces at mailman.qth.net]
> On Behalf Of Gene Lewis
> Sent: Saturday, December 09, 2006 9:53 AM
> To: n5ok at arrl.org; Discussion of OKDXA
> Subject: Re: [OKDXA] VU7
>
> Roger that, Coy,
> Sure wish I could run the antenna on up a ways but don't have that
> option...heavy sigh 8-<
> ----- Original Message -----
> From: "Coy Day" <n5ok at arrl.org>
> To: "OKDXA" <okdxa at mailman.qth.net>
> Sent: Saturday, December 09, 2006 9:48 AM
> Subject: [OKDXA] VU7
>
>
>> Gene,
>>
>> Bert is absolutely correct in that the take off angle for that part of
>> the
>> world is absolutely critical.  On 20 meters with the antenna at 55ft
>> your
>> take off angle is way too high.  You would have a better chance on 15 if
>> the band would open.  :-(
>>
>> Coy
>> --
>> Coy Day, N5OK
>> 20685 SW 29
>> Union City, OK 73090
>> 405-483-5632
>>
>>
>> _______________________________________________
>> OKDXA mailing list
>> OKDXA at mailman.qth.net
>> http://mailman.qth.net/mailman/listinfo/okdxa
>>
>
> _______________________________________________
> OKDXA mailing list
> OKDXA at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/okdxa
>
>
> _______________________________________________
> OKDXA mailing list
> OKDXA at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/okdxa
>
>

_______________________________________________
OKDXA mailing list
OKDXA at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/okdxa