Re: [TCML] freau phase anjuster

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Bob,

My SRSG uses a Teletype motor so I can't suggest what cap value might be
appropriate for your motor.

I never bothered to look at voltage rise, and attempting to gauge the shift
with a FL light was always difficult, and subjective at best.  Rather, I
monitored the actual phase shift by taping a small magnet to the motor
shaft, and scoping a pickup coil held beside the rotating magnet (Scope set
to LINE sync).

Regards, Gary Lau
MA, USA

On Sat, Jan 14, 2012 at 12:58 PM, robert massa <massahbob@xxxxxxxxxxxxx>wrote:

>    Have fabricated a mechanically sound srsg.
> Used a 1/3 hp 1750rpm 120v motor and milled 4 flats and it runs 1800 dead
> on. Can see it with flourescent and LED light.
>  Figured that the phase shifter would be a snap as the schematic looked
> simple. Have a propeller type rotating 1/4" tungsten rod and 4 stationary
> contacts,120bps.  Hooked it to smaller TC and through trial and error got
> the prop indexed on shaft close. Due to the motor available there is no
> cradle to rotate in so will be slotting bolt holes in mounting to
> accomodate 1/8 of rotation.
>   Have been adding run caps 25uF to 250uF in various combo's 5 to 7.5uF at
> a time. I have white mark and can tell when in sync.
>   1) I'm not sure where the resonant V rise is measured and compared to
> what ?
>   2)  Should I be able to see the phase moving using fl. lighting or led ?
>  3)  Any suggestions on the amount of capacitance needed to make it shift ?
>  Am using a 120/140v 5a variac in circuit.
>                                         Thank you, Bob
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