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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