[TowerTalk] Rohn 45 Question

[john at kk9a.com]

What do you call a large antenna?  What does installing one without a crane 
have to do with multiple thrust bearings?


----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: <K7LXC at aol.com>; <towertalk at contesting.com>; <john at kk9a.com>
Sent: Saturday, August 25, 2007 2:19 PM
Subject: Re: [TowerTalk] Rohn 45 Question


I take it then that you have never experienced the installation of a large
stacked array without a crane.

Old wives tales? Hmmm, most of those that I know have at least a Masters
degrees in an engineering discipline.

Plus NE Yankees are not known for spending money frivolously.

Cheers Yourself
Carl
KM1H




----- Original Message ----- 
From: <K7LXC at aol.com>
To: <km1h at jeremy.mv.com>; <towertalk at contesting.com>; <john at kk9a.com>
Sent: Saturday, August 25, 2007 1:21 PM
Subject: Re: [TowerTalk] Rohn 45 Question


>
> In a message dated 8/25/2007 10:00:45 A.M. Pacific Daylight Time,
> km1h at jeremy.mv.com writes:
>
>>  Thats strange. Numerous YCCC and other serious  contesters/DXers with
>> big
> stacked arrays have been using dual bearings for  decades with a
> significant
> reduction in rotator failures.
>
>    Reduction because of what? Reduction from what to  what?
>
>    What actual mechanical improvement does the  additional mid-bearing
> make?
> More torque reduction? No. More vertical weight  reduction? No, the
> weight's
> already on the top bearing. A psychological  improvement? Probably. More
> ham
> radio old wive's tales? Probably.
>
> Cheers,
> Steve     K7LXC
> TOWER TECH -
> Professional tower services for hams
> Cell: 206-890-4188
>
>
>
>
>
>
>
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