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Subject: Re[2]: HD rotators
Author: John Evans at COR-FS5
To: <towertalk@contesting.com>
Date: 1/6/97 3:57 PM
Steve,
My rotating tower system uses an HDR 300 rotator operating
at half-speed through a chain drive. My particular "war
stories" are that it would not hold the drive shaft provided
by RTS, which is 2-inch in diameter. I had to get a collar
welded on to increase the diameter to 3 inches to solve this
particular problem. My other difficulty has been with the
small screws that attach it to a mounting plate. Wind-induced
vibration of some of the antenna elements couples into the
tower and has twice caused these bolts to unscrew leaving the
rotator hanging by its control cable! (The reason it happened
twice is because I did not understand the cause the first
time around!) When it happened the first time, the fiberboard
cover was all smashed as well as the internal electronics. I
had an aluminum box fabricated to replace the fiberboard one.
This problem seems to have been solved by "Loctiting" the
bolts into their sockets! Other problems include the control
cable fouling the brake pall when first installed (resulting
in the coax loop being shredded and the readout pot being
smashed), and having to make harder keys. I am curious,
however, to hear if you ever built someone a propitch rotator
for this application? John N3HBX.
____________________ Reply Separator _________________________________
Subject: Re: HD rotators
Author: K7LXC@aol.com at INTERNET
To: <towertalk@contesting.com>
Date: 1/6/97 12:23 PM
In a message dated 97-01-06 11:07:18 EST, W9UI@SprintMail.com (Bob Eslaire)
writes:
>It would be interesting to know the reasons for your ordering, Steve.
>What specific problems do the commercial rotors suffer from (I know all
>about the HDR-300, as I have one and have to repair it often!).
>HDR-300 The HDR-300 takes an off-the-shelve 1 RPM transmission and mates
the indicator, brake, etc. to it. It has the well-known keyway and related
problems. It's a "semi-HD" rotator.
> Yaesu G-2800 Another "semi-HD" rotor, it has reasonable rotating and
torque figures but uses a conventional-type brake (non-worm gear) and has a
weak mast clamp.
> Create RC5B3 This is a decent rotator. It has a worm gear transmission so
it doesn't need a brake, has substantial gears and a real nice control box.
It's weakness is the cast aluminum mast clamp.
> Orion 2800 Now we're getting somewhere. This rotator features a splined
output shaft (no more keyway), worm gear transmission and the best mast clamp
in the business. The new digital control box has its quirks but does have
presets and is computer ready.
> Prop pitch Search no more for the BEST rotator even made. One of these
will turn your house and last 20 years or more. Full-sized 80 meter beam?
HA! No problem. You have to either fabricate the control box and indicator
system yourself (not that tough) or buy the whole thing from Glenn, K6NA.
By mere conincidence, TOWER TECH carries the Create, Orion and prop
pitch rotators. We only handle the best.
>
73, Steve K7LXC
TOWER TECH -- professional tower supplies and services for amateurs
CLAIMER: My opinions are those of my employer. So there.
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Subject: Re: HD rotators
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