[TowerTalk] steppir v. lpda

[Gene Fuller]

For the umpteenth time,ehy not make up 200 ohm  line,using 1/4" copper 
tubing, on standoffs to keep aay from the boom, placing the balun back at 
the mast, where it is accessible.
----- Original Message ----- 
From: "jim Jarvis" <jimjarvis at optonline.net>
To: <towertalk at contesting.com>
Sent: Saturday, January 23, 2010 3:24 PM
Subject: Re: [TowerTalk] steppir v. lpda


> This topic is like eating potato chips.
>
> Private communication from N2TK reveals that SteppIR had a supply problem 
> with
> Fernco boots, and used Mission for a while.   The Mission boots have a UV 
> degradation
> problem.    My Fernco boots, now.... 10 years old... are just fine.
>
> On the topic of stepper motor fails,  I would tend to believe that the 
> wiring TO the motor
> was at fault, and not the motor.   The weak spot in this antenna is the 
> termination barrier
> strips for the control cable, in my view.    It's subject to variability 
> in installation technique.
> Statistically, that's much more likely than having a stepper motor fail.
>
> -0-
>
> On the topic of 200 ohm feedline,  the Tennadyne design uses a 200 ohm 
> feedline BOOM,
> fabricated from square tube and spacers.   If there is a weak spot in the 
> design, it lies in
> locating the balun at the nose of the boom, and routing the coax cable 
> back along the lower
> limb of that feedline, unbalancing it, and coupling rf into the coax 
> shield.
>
> I fixed that with ferrite chokes at the mast-boom plate on mine.
>
> -0-
>
> n2ea
>
>
>
>
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