[amsat-bb] Re: Pendulum type elevation measurement

Joe nss at mwt.net
Sun Feb 24 06:05:43 PST 2013

I see no problems at all.  I have done it with that method in the past. 
The only thing I noticed that was a problem was if the pendulum is 
exposed to the elements. As in weather not antenna elements. Gusty winds 
would move the pendulum and cause a not steady reading..

but not that much of a problem did not happen all that often.

The Original Rolling Ball Clock
Idle Tyme
On 2/24/2013 5:45 AM, Richard Ferryman wrote:
> For some time I have wanted a more accurate antenna elevation measurement system.  Shaft encoders are beyond my budget.  It seems sensible to use a pendulum operated system.  Digging through my 'junk' box I find I have a new Spectrol  precision potentiometer still sealed in it's package.  This pot is 21mm diameter, has a servo type mount,, ball race bearing, 340 degree track (continuous rotation possible)  and specification is 0.5% linearity.and is very low torque.   Does anyone know if there are any drawbacks to using this method of position measurement.
> 73 de Dick G4BBH
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