[OKDXA] VU7

[Gene Lewis]

I follow what you're saying about the plotting of the gains and all but how 
exactly does that affect reception?  I'm not having a problem transmitting a 
signal to them, I'm having a problem hearing them.  How does all these 
numbers affect reception?  Or am I dense?
Gene

----- Original Message ----- 
From: "Bert Aaron" <k2ba at cox.net>
To: <n5ok at arrl.org>; "'Discussion of OKDXA'" <okdxa at mailman.qth.net>
Sent: Saturday, December 09, 2006 11:56 AM
Subject: RE: [OKDXA] VU7


> 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
>>>
>>
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>
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