[TowerTalk] Rohn Info

[Michael Tope]

Hi Stan,

I just noticed the Rohn drawings for TVRO 
applications with EPA of 49 sqft last night
while purusing my new Rohn consumer catalog.
This is interesting in light of discussion 
I have had recently on the reflector regarding
the strength of the BAS25G accessory shelf 
top section. If you look at these drawings,
you will notice that in the TVRO application,
the antenna is mounted on a top plate which 
goes directly on top of a 25G section. Thus
it has Z bracing all the way to the top, 
unlike the BAS25G which leaves out Z bracing 
on the top 2' of the tower. Notice also, that 
this installation is guyed at the top plate 
with a torque arm assembly. 

Mr. Tower2sell is making a believer out of me.

Mike, W4EF...................................


********************************************
Michael C. Tope, W4EF

email: W4EF@pacbell.net
  web: www.dellroy.com
********************************************



----- Original Message ----- 
From: "Stan or Patricia Griffiths" <w7ni@teleport.com>
To: <towertalk@contesting.com>
Sent: Thursday, August 10, 2000 5:57 PM
Subject: [TowerTalk] Rohn Info


> 
> I have investigated how I can distribute small bits of
> interesting Rohn information and stay out of trouble with
> everyone at the same time.  Rohn has copyrighted all of the
> drawings and catalog pages and will not give me permission
> to publish any of them.  They will, however, allow me to
> copy individual sheets from Rohn Catalogs and mail them to
> individuals who ask.
> 
> I consulted an attorney who told me that emailing an
> individual scanned copy to an individual person who requests
> one is really the same as sending a hard copy through snail
> mail.
> 
> So here is what I am willing to do, until I get swamped with
> too many requests, anyway.  Below is a list of Rohn Catalog
> pages that have some information on them that may be of
> interest to some of you.  If you want me to scan the page
> and send you a copy, just request it via email and I will do
> it.
> 
> 1.  There was discussion about whether or not it was
> appropriate to wrap a guy wire around a tower leg or whether
> you must always use guy attachment hardware.  I have a page
> from a 1977 Rohn catalog showing the proper way to wrap a
> guy wire around a tower leg.  Request document 2536.
> 
> 2.  There was some discussion about whether Rohn recommends
> the use of Preform Guy Grips.  Of course, they do.  There
> was also some question about Rohn's position on using End
> Sleeves with Big Grips.  They say End Sleeves MUST be used
> with all guy grips.  This information can be found on Page
> HA-2 of the very latest Rohn Consumer Catalog.  Request
> document 2537.
> 
> 3.  There is some very interesting new information about the
> use of 25, 45, and 55 towers in TVRO (Television Receive
> Only) applications in the latest Rohn Consumer Catalog.  The
> guying digrams show guys at a much steeper angle than any I
> have seen before on any Rohn diagram and with a much larger
> Effective Projected Area on the top than I have seen
> before.  (48.9 square feet at 70 mph on 25G, for example).
> This is a TVRO application, remember, and the load is
> expected to be a 6 foot diameter dish and not a long boom
> Yagi.  Still, the information is interesting because it is
> so different than any I have seen before from Rohn.  Use
> caution when applying this to ham antennas.  Better yet, use
> a PE to apply it for you.  For 25G TVRO Guying Diagram and
> Parts List, order documents 2538a and 2538b.
> 
> 4.  For 45G TVRO Guying Diagram and Parts List, order
> documents 2539a and 2539b.  (87 square feet at 70 mph, 8
> foot dish)
> 
> 5.  For 55G TVRO Guying Diagram and Parts List, order
> documents 2540a and 2540b.  (94 square feet at 70 mph, 10
> foot dish)
> 
> Are there any other Rohn documents or drawings you would
> find useful that I can scan and send you?  I hope I can
> handle the volume . . .
> 
> Stan  w7ni@teleport.com
> 
> 
> 
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