Sounds like the Alfa Spid
On the road
Sent from my iPad
On Apr 4, 2014, at 6:52 AM, "David Robbins" <k1ttt@arrl.net> wrote:
> Yes, the early 1032 ring I had used a pulse counter but it was just a
> microswitch that counted gear teeth. It also had limit switches that used
> plastic ramp things on the inside of the ring to stop it.
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Zivney, Terry
> Sent: Friday, April 04, 2014 02:18
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] TIC Potentiometer
>
> 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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