[Towertalk] Any glaring discrepancies?

[kk9a@arrl.net]

I would not recommend the HDR300.  I owned two of
them for several years and they needed servicing many
times.  The biggest problem was that the shaft keyway would
elongate and become very sloppy.  The antenna would then
free spin 30 degrees.  I  tried making my own shafts out
of hardened tool steel and even this didn't cure the problem. 

John 

-----Original Message-----
From: WYsixK
To: towertalk@contesting.com
Sent: 4/12/2002 3:25 PM
Subject: [Towertalk] Any glaring discrepancies?

I also would suggest a different rotator.  I have an HDR300 that has
been seriously overloaded for 20 years and it has been nearly flawless.


--- k6ll@despammed.com wrote:
> > 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.)
> 
> A few thoughts:
> 
> I don't like Ham-IV's. The top and
> bottom halves are held together by
> self-tapping screws that are a weak
> link. It's very
> embarrassing to come home and find the
> bottom half of the rotor sitting stationary on
> the rotor plate, four screws lying in
> the grass at the base of the tower,
> and the antennas and top half of the rotor freewheeling in the wind!
> 
> I'd swap the Ham-IV for a Tailtwister.
> 
> I would feel better with about 1/3 of
> the mast inside the tower.
> 
> I'd put the TH-7 at 70' instead of
> 75. The extra 5 feet wouldn't do anything for you, and you need more
> separation from the WARC antenna.
> 
> I'd put that little A3 at the top of the
> mast, with the 40 dipole right below or above it, at a 90 degree
> angle. That's your best bet for avoiding interaction on all the
> bands.
> 
> Let us know how you make out with the AN
> Wireless tower. Not much customer
> feedback on here yet.
> 
> Dave, K6LL
> K6LL@despammed.com
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


__________________________________________________
Do You Yahoo!?
Yahoo! Tax Center - online filing with TurboTax
http://taxes.yahoo.com/
_______________________________________________
Towertalk mailing list
Towertalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk