[AMRadio] Motor revisited


Bill Smith hbco2 at sbcglobal.net
Mon Apr 2 15:29:57 EDT 2007


Make that BT-20-A

----- Original Message ----- 
From: "Bill Smith" <hbco2 at sbcglobal.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Monday, April 02, 2007 12:29 PM
Subject: Re: [AMRadio] Motor revisited


>
> ----- Original Message ----- 
> From: "Rick Brashear" <rickbras at airmail.net>
> To: "'Discussion of AM Radio in the Amateur Service'"
> <amradio at mailman.qth.net>
>
> > I have been unable to find a 2 RPM Synchron motor for the timing delay
on
> > the old GE BT-20-A I am bringing back to life.  I can find plenty 1 RPM,
> > however.  Other than taking a full minute to allow B+ to be activated
> > instead of 30 seconds, I can see no reason why it wouldn't serve the
same
> > purpose.   I sometimes overlook the obvious, can any of you guys see
> reason
> > why this would not work?
> >
> > Thanks,
> > Rick/K5IZ
>
> The manual states a delay of 30 seconds delay due to the operation of 1K1.
> Perhaps the motor has been changed in the BA-10A here, but the measured
> delay is 1 minute.  The motor looks original (can't read the speed without
> disassembling the unit).
>
> Never noticed the additional delay here, other than normal impatience.
>
> If you replace the motor, make sure it has either the correct gearing or
an
> extended shaft.  It doesn't look like a generic motor to me.
>
> Bill
>
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