[R-390] Collins R 389 PTO

[Gary Pewitt]

Pardon the possibly off topic question but wouldn't it be at least as 
important to develop a way to -prevent- the PTO from self distructing 
in the first place.  A better stop, some kind of microswitch 
controlling a relay to cut the motor, a slip clutch, etc. ?  Then you 
could at least make the still good ones last longer.
My 2 cents worth.   73  Gary N9ZSV


At 07:17 PM 5/5/2009, Cecil Acuff wrote:
>Well if I can find a 389 in reasonable shape with a munched PTO and maybe a
>2nd munched PTO that all was also reasonably priced I would be happy to make
>an attempt to develop a method to rehabilitate the original PTO's.
>
>But it appears only functioning 389's are offered for sale...or ones with no
>PTO included at all which is no help!
>
>Cecil Acuff
>K5DL
>----- Original Message -----
>From: <Flowertime01 at wmconnect.com>
>To: <R-390 at mailman.qth.net>
>Sent: Tuesday, May 05, 2009 4:40 PM
>Subject: Re: [R-390] Collins R 389 PTO
>
>
> > Bill,
> >
> > R389 did run into a to least a couple 1000 built.
> > We think there may be 25 units at current time that need a VFO.
> >
> > Down the other path, what are the chances of mixing core stuff and epoxy
> > to
> > make a new core?
> >
> > We could do a cold glue core and machine it to size and thread that would
> > fit the shaft.
> >
> > Then we would have to do a new coil form and wind a coil.
> >
> > We could select the new core outside diameter to fit a stock core form.
> >
> > I cannot imagine how many test coils would need to be wound to get the
> > inductance and linearity close enough to be usable.
> >
> > Roger AI4NI
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Gary Pewitt  N9ZSV   garypewitt at centurytel.net  479 675 4376
1500 French Prairie Rd. Booneville, Arkansas  72927
Sturgeon's Law "Ninety percent of everything is crap."
Pewitt's Law: But it's that other 10% that makes life worth living."