>
> Dave,
>
The typical HAMIV and T2X rotators have 3 separate systems inside them. A
500 ohm potentiometer to determine position, a motor and gear box to turn
the thing, and a brake solenoid that pulls a brake wedge out of cogs in the
housing sides to allow the rotator to turn. You only mention that the
brake is repaired each time you send it out so I am assuming that the motor
and potentiometer are still good.
Due to the way the brake wedge is designed they tend to hang up if the
antenna is twisting in the breeze and puts any pressure on the brake wedge
pushing it against the cogs and making it hard to retract and free the
rotator to spin. If you suspect that the brake is hanging you can listen
for it as it makes a distinct clank when the solenoid pulls it in.
If it hangs up, sometimes you can free it up by telegraphing the brake
lever while rocking the CCW and CW levers in an attempt to hammer the
brake out of the cog if it stuck.
One thing you might want to check is the size of your rotor cable to make
sure you have the right size conductors for the length of run you have out
to and up the tower. If the wire is too small, it will limit current to
the motor and brake making it turn slower or making the brake harder to
retract.
Earl
N8SS
------------------------------
>
> Message: 2
> Date: Sat, 18 Feb 2017 10:50:13 -0800
> From: "Jim Thomson" <jim.thom@telus.net>
> To: <towertalk@contesting.com>
> Subject: [TowerTalk] T2X Multiple failures, fix?
> Message-ID: <A1323F6172D34042908079FD7717EF14@JimPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Date: Sat, 18 Feb 2017 17:57:09 +0000 (UTC)
> From: DAVE WRIGHT <kanives@yahoo.com>
> To: "TowerTalk@contesting.com" <TowerTalk@contesting.com>
> Subject: [TowerTalk] T2X Multiple failures, fix?
>
> ?Greetings all,
> I've been having a continuous problemw/my tower setup since installed in
> 1993'. I just can't figure it out. I've mentioned this online in the past,
> & received much helpf/hams/clubs & groups (K6EAG/TT/& NCCC) both local &
> abroad,thank you! However the system is still having the same problem;
> itseems incurable. :(
> The system is: Tri-Ex LM-354 tower (54'HD crank-up, w/tilt-over base),
> that keeps eating rotors. The Yagi isa Mosley ?Pro-57b,? mounted on various
> mast lengths/strengths(both short & long), 2? OD/1/4" ID f/aluminum. Have
> also tried differingmaterials (both steel & thick-wall aluminum), w/a
> thrust bearing(used 3 in 23 years/both stainless-steel sealed bearings,
> &?open? bearings using marine grease (local salt-air/SF, CAbay-side.) I've
> been using T2X rotors mounted IN tower f/the start; & they eitherdon't last
> long, or quit immediately (last 2), ?right after? arebuild.
> Originally purchased the 1strotor new, & have had the last 2
> rebuilt/exchanged several timesvia the two popular repair/rebuild shops
> here in the US. The onlypossible problem I can see from the ground is the
> Yagi ?swings? abit back & forth after done turning/brake initialization.
> (looks like the swing is too much?)
> Other than that, nothing seen exceptwhen it starts to fail, it will not
> turn up on tower; even though itturns fine on the ground. That is, until it
> becomes ?stuck? forgood/then I send it off f/a rebuild. The repairs
> typically mention?brake failure.? I have since purchased the
> ?brake-delay?PCB, & the next rotor will have it installed in box.
> At this point I'm -almost- positiveit's an ?alignment? issue(?), but I'm
> not clear how proceed. Ihad assumed perhaps wrongly that once everything
> was bolted together,it's functional/should work. I have now been advised
> that assumptionmight be incorrect. If someone could point me to a link/site
> w/theironclad alignment procedure in writing/illustration/or video,
> thatwould be perfect.
> When functional, the system worksgreat! =304 worked/277 confirmed. Most
> w/this system, & a fewwires/dipoles/ smaller Yagi's prior to this large
> Yagi. Problem is,it's been down more than 60% since installation. Never had
> theseproblems w/a small tri-bander; this just sucks! :( I'veabout given up;
> & haven't been on much at all. (99% HF.)
> This record of failure is justintolerable, & now that my age is getting up
> there w/healthissues, I won't be able to work on it much. Need help as
> itis. Any suggestions/troubleshooting discussion? I would be reallyhappy to
> get on air & try f/the last few ?rare ones,? &do a few more of the popular
> contests before kicking da bucket. :)
> Thank you all,
> Dave K6JOX 73
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