[TowerTalk] Heathkit SA-7010/Hy-Gain TH-4

Joe Subich, W4TV lists at subich.com
Fri Jul 5 20:31:24 EDT 2019


 >> Anybody got any idea if the 5.8 sq. ft. "Surface Area" listed in the
 >> Heathkit manual is a good number to use for wind load?

The surface area listed in the Hy-Gain TH4-190 manual on BAMA
<http://bama.edebris.com/manuals/hygain/th4-190/> is 7.5 ft^2.

Since surface area computations for antennas of that vintage are
notoriously low, I would use *at least* they Hy-Gain specifications.

73,

    ... Joe, W4TV


On 2019-07-05 8:11 PM, John Kemker wrote:
> Anybody have any ideas?
> 
> If you reply, please do so on the list, not in a private email.  I'd like
> to tap into the collective wisdom of the group, not just one person's
> opinion.
> 
> --73 de W5NNH
> 
> On Mon, Jul 1, 2019 at 6:01 PM John Kemker <kemkerj3 at gmail.com> wrote:
> 
>> I've purchased a used Heathkit SA-7010 from another ham and am in the
>> process of restoring it to usable condition.  MFJ's Tech Support told me
>> that it's basically a TH-4 from Hy-Gain, marketed by Heath back in the day.
>>
>> Anybody got any idea if the 5.8 sq. ft. "Surface Area" listed in the
>> Heathkit manual is a good number to use for wind load?  I'd like to figure
>> out if the CD45 that I've got will be sturdy enough to turn this antenna.
>>
>> --73 de W5NNH
>>
>> --
>> --John E Kemker III
>>
> 
> 


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