Why not bring all your coaxes to the ground....and install the coax switch
there...
Why?
In case of failure of the switch it is a piece of cake to diagnose and fix
it....
Initially this is a bigger coax expense and yes there is a small tower
loading increase but the first time you replace/rework the switch at ground
level you can mail me your thank you check!
Did you know that no voltage on an RCS8V means nothing is selceted and all
are grounded? FLASH a sudden burst of activity - a regional contest...its
in Floirda...you turn the beamsSouth for the floirda QSO Party but - your
coax switch is hosed...what do you do - if your coax switch is he ground its
no biggee...you walk outside with with a barrel connector and voila you are
back on the air!
Which reminds me - 15 days til FQP 2K2!
73,
Jim, K4OJ
----- Original Message -----
From: <blueis@sprintmail.com>
To: <Towertalk@contesting.com>
Sent: Friday, April 12, 2002 1:22 PM
Subject: [Towertalk] Any glaring discrepancies?
> After the fourth iteration I have made the 'final' decisions. The Spring
> (?) antenna/tower project will consist of 70' AN Wireless tower (*massive*
> windloading spec!), TH7 at 5' above top of tower, Cushcraft A3WS w/30m
> add-on at 80', and 40m rotatable dipole at 85'. All of this will be
> (hopefully!) turned by a HAM IV rotor using a <fill-in-the-type> 20' mast.
> (five feet of mast 'nested' in tower) I will be making one 100' run of
> LMR-400 to an Ameritron remote coax switch at the top of the tower. (Two
> 'spare' coax runs will be installed on the tower.)
>
> After reading the TT mail for about a year, I belive I have adherred to
the
> basic tenents and good practices espoused on TT. I have no capability of
> 'modeling', so I am asking if anyone sees any major problems with this
> arrangement. I have the *written* authorization/building permit of
> zoning/codes officer to install a tower (et al) to a max height of 85'.
>
> Is there anything I should -- nay, MUST -- change? What type of mast will
> *reliably* keep all this aluminum in the air for the next ten years? Is
my
> plan to make all booms parallel wise? Or should I make the 40m dipole
> perpendicular to the TH7/A3WS booms. I'm not sure if the spacing between
> the TH7 and the A3WS is 'optimal', but have little latitude because of the
> structure's height restriction.
>
> I am as concerned about what I may have forgotten as I am about my plans.
> Has anyone developed a 'checklist' for antenna/tower projects? I DO plan
to
> install a SPG system and use grounding/lightning protection as my
pocketbook
> allows.
>
> I have not found a used 40m rotatable dipole yet. Do you know of one
> available? From what I have read on TT, a rotatable dipole at 75' to 85'
> should play well in 'normal' situations. Is there a particular model you
> would recommend??
>
> Lastly, I ask if you know of anyone who could act as contractor/installer
> for this project in southcentral Pennsylvania? I cannot/do not climb, so
I
> need a recommendation of someone to do the tower work. (I will hire a
local
> excavator to put in the tower base and will probably bring a crane in to
set
> the tower.) [See, Steve... your list of installers IS needed!]
>
> Emails back-channel are perhaps more appropriate... unless you can use my
> info above to point out discrepancies for everyone's benefit.
>
> Thanks
>
> gary b
> k3gb
> RVN BTO
>
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