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Re: [TowerTalk] TIC Potentiometer

To: "Zivney, Terry" <00tlzivney@bsu.edu>
Subject: Re: [TowerTalk] TIC Potentiometer
From: Scott Bullock <scottb@radios-online.com>
Date: Thu, 3 Apr 2014 22:31:12 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Yes you are correct this only works if the motor slippage issues are addressed. 
As long as the motor is at the same "locked in" speed it will work. A pulse 
counter is far superior in mtbf to a pot. Also hermetically sealed. 
Scott
N1CX


Salty's 
www.radios-online.com

> On Apr 3, 2014, at 10:17 PM, "Zivney, Terry" <00tlzivney@bsu.edu> wrote:
> 
> I seem to recall K1TTT said the earliest rings used a pulse counter instead 
> of the pot.  The implication being that the pulse counter approach had 
> problems and was upgraded to the pot.
> 
> A basic problem with putting the whirling magnet on the motor shaft is that 
> it only counts how many times the motor shaft turns.   But, many of he rings 
> appear to skip or slip or miss a beat (whatever you want to call it). So, the 
> ring location is computed by counting the number  of rotations of the motor, 
> not the rotations of the ring.
> 
> In my case, the pot reliably follows the motor and the spur gear that is 
> supposed to drive the ring.  The problem with inaccurate readout is not
> caused in these cases by the pot but rather by the spur gear and ring 
> gear losing contact from time to time.
> 
> It seems that is also the case with the ring in the recently posted YouTube 
> video of a  TIC ring problem.
> 
> A pulse counting technique that is counts motor revolutions is not inherently 
> superior to a precision potentiometer geared to that same motor.  The 
> selected pot is a ten-turn pot which has lots of resolution potential (sic).  
>  
> 
> Terry N4TZ
> 
> 
> 
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