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RE: rotor backlash



What program are you using???



Vy73,  Mike.   KD9KC    MARS: AAV6EV
kd9kc@elp.rr.com  -  kd9kc@amsat.org
Home page: http://www.qsl.net/kd9kc/
The farthest WEST ham in West Texas.
 
In America, Anyone Can Be President.
That's One of the Risks You Take.

> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of Mike West
> Sent: Tuesday, September 21, 1999 8:52 PM
> To: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] rotor backlash
> 
> 
> Greetings from Alaska,
> 
>     I just reworked my Oscar antennas and tower. I wanted to separate
> the antennas by using the M2 boom kit (11 feet over-all). I have a set
> of Cushcraft "Boomers" a 2 1/2 ft dish and a 35 el 1.2GHz antenna on
> the boom.
> 
>     Now when the AZ rotor moves and stops while tracking, the whole
> system swings back and forth several degs. Some times causing the AZ
> rotor to move back and forth trying to point at the satellite. I
> didn't have this problem with the old 7 1/2 ft cross boom.
> 
>     I am using a Rohn BAS25G, bearing/accessory shelf and TB3 thrust
> bearing and for the mast a 5 1/2 ft, 2'' fiberglass shaft.
> 
>     I was wondering if anyone has a fix for the back-lash other than
> going back to the 7 1/2 ft. "X" cross boom or smaller antennas.
> 
>     Thanks,  Mike     WL7BQM
> BP40om
> 
> ----
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