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 various
reasons.
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
them.
Best of luck.
73's Mike K9MK
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Daryll Webb
Sent: Saturday, January 29, 2011 9:59 AM
To: TowerTalk@contesting.com
Subject: [TowerTalk] HDR-300A info
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
had
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
I
can turn ccw again.
If anyone has had this happen to them some info would be nice.
Thanks Daryll kg9nd
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