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Re: re:Alliance Rotator Question



Gene,
Having a pot with good resolution is important, and I have found that a 
second speed is helpfull in stoping at a given point. I have  used a diode 
in one of the three motor wires to cause the rotator to creep slowly, 
shorting it out the diode with a switch alows the rotator to move at full 
speed. You loose torque but having a way to achieve a presision stop at a 
given elevation is a plus on 2.4 GHz systems.

Art,
KC6UQH

----- Original Message ----- 
From: "Prathap Kumar" <vu2pop@gmail.com>
To: <amsat-bb@amsat.org>
Sent: Saturday, March 11, 2006 7:50 PM
Subject: Re: [amsat-bb] re:Alliance Rotator Question


> Dear Gene
>
> There an article on the web which I have seen and built one similar , you 
> can google search for this title   "Adding a Position-Feedback 
> Potentiometer to a TV Antenna Rotator"
> Good luck
> Best 73
> Pop
> VU2POP
> Secy Amsat India
>
> ----- Original Message ----- 
> From: "Gene Marks WB2LLP" <wb2llp@optonline.net>
> To: "Paul Proefrock" <paul@proefrock.net>; <amsat-bb@amsat.org>
> Sent: Sunday, March 12, 2006 6:11 AM
> Subject: [amsat-bb] re:Alliance Rotator Question
>
>
>> Paul,
>>
>> A friend gave me a rotator that looks just like an Alliance 100 until you
>> discover that there are 5 screws on the phenolic plate.  I took it apart 
>> and
>> there was a wire wound pot on the inside connected to the mechanism. 
>> The unit
>> appears to have been made this way, not an after the fact addition. 
>> There was
>> no identification on the case other than the name Alliance.   I do not 
>> remember
>> if I got a control unit with it or not, but I can not find one at the 
>> moment.
>> The layout of the screws on the phenolic plate looked as if it was 
>> designed to
>> have 5 wires not 4.
>>
>> The gentleman that gave it to me was from Canada which made me wonder if 
>> it was
>> a unit made for the non-US market.
>>
>> I kept it intending to do what you want to do,  but have not had the 
>> time.
>> Hopefully your query will find someone who knows more about this rotator. 
>> Was
>> it a commercial unit, or the work of a ham who did quality work?
>>
>> 73 de WB2LLP
>> Gene Marks  FN31bt
>> ----
>> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
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----
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