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Re: [TowerTalk] HDR-300A info

To: "'Mike & Becca Krzystyniak'" <>, "'Daryll Webb'" <>,, "'Rroger (K8RI on TowerTalk)'" <>,, "'James Wolf'" <>
Subject: Re: [TowerTalk] HDR-300A info
From: Doug <>
Date: Sat, 29 Jan 2011 16:25:12 -0600
List-post: <">>
IMO the over rotation system (limit switches, etc.) on this
rotor has little benefit with the stock controller.  I remove
it from my HDR-300s.  One benefit in removing the over
rotation is that the range of rotation can be increased beyond
360 degrees.  Plus you don't have the problem when the
antennas turn beyond the limits.  Just make sure you have
enough coax looped around the mast to cover the new range.  

6P plastic paddle arm and push out
6Q plastic limit switch actuator w/Allen setscrew


I'll run the race and I will never be the same again. 

-----Original Message-----

Hi Daryll,

    I have a HRD-300 here and been using it steady for nearly
30 years.  The
rotor itself has been 100% reliable, but the 4 turn pot and
the limit
switches, a.k.a. the "micro switches" are prone to become
flakey or fail.  I
have had to replace one or more of these every 3-4 years for

   On the 1K-4T POT, just take a ohm meter and check the
resistance from
wiper to each end.  Either the wire to the wiper has opened up
or one end of
the POT has failed.  If the POT is okay the issue is probably
one of the
chips inside the display.

   On the turning issue, it sounds like maybe one of two
things. Where I
live it is not uncoommon for the limit switches get some dust
in them and
they start sticking.  Some contact cleaner or WD-40 works well
to free them
up.  The other possibility is that you have somehow slipped
past the stop
(this can heppen when a limit switch sticks).  Otherwise you
need to verify
the limit switches with respect to the trip cam, and if
necessary reset

   Best of luck.

73's  Mike  K9MK

-----Original Message-----

Hello to all name hr Daryll kg9nd

I have the hy gain hdr300a    it has been setting for about
one year.
The potentiometer will not change readings on the dig box. Has
anyone else
this happen the them?

The other thing is if I turn cw to the limit I must turn ccw
half way around

before I can turn cw again.
Same thing if I turn ccw to the limit I must turn cw half way
around before
can turn ccw again.

If anyone has had this happen to them some info would be nice.

                         Thanks Daryll kg9nd


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