[R-1051] R-1051 Motor Problem

[Tony Snider]

Larry,
many of these motorized tuning circuits use a relay to supply power to the 
drive motor and when the target position is met the relay removes 28vdc from 
the motor and grounds the motor's 28vdc terminal to brake the motor, I 
cannot remember for certain if this is the case for that module but a know 
that the rf amp works that way, anyway if you loose the relay it will go 
around, you will hear the relay click and it goes around again
just a thought
Tony



----- Original Message ----- 
From: "Larry Kirkland" <lkirkland at sc.rr.com>
To: "R-1051 Discussion Group" <r-1051 at mailman.qth.net>
Sent: Wednesday, June 14, 2006 10:07 AM
Subject: Re: [R-1051] R-1051 Motor Problem


> Cecil and group;
>
> Here's where I am with getting the R-1051 running.  I cleaned up the stuck 
> motor that selects the crystal position in the MCS Synthesizer module. 
> Now it runs fine, maybe too well.  When I select a new MC, the motor runs 
> to the correct switch position, 28 vdc is shut off the motor, but the 
> motor coasts past the correct point as it is spinning down and touches 
> onto the next switch position where 28 vdc is supplied again.  the motor 
> starts up again, the switch makes another 360 degrees and the process 
> repeats itself.  It's like the motor is not dynamically braking or there 
> is not enough friction to stop the motor fast enough. Have you ever seen 
> this happen?
>
> Larry W4LK
> _______________________________________________
> R-1051 mailing list
> R-1051 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-1051