[TowerTalk] HDR-300A info
Rroger (K8RI on TowerTalk)
k8ri-on-towertalk at tm.net
Sat Jan 29 12:59:08 PST 2011
On 1/29/2011 11:53 AM, Mike & Becca Krzystyniak wrote:
> 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).
Or if the brake is released on a windy day. This array
http://www.rogerhalstead.com/ham_files/Tower29.htm would take the 300
past the limit switches unbelievably quick on a windy day. As I operate
regardless of the weather I had to go to rotators that didn't require
brakes. (double worm gear drive)
73
Roger (K8RI)
> 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 at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Daryll Webb
> Sent: Saturday, January 29, 2011 9:59 AM
> To: TowerTalk at 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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