[R-390] Re: R-390 Digest, Vol 54, Issue 22

[Bernard nicholson]

Re    PTO linearity .     Guday Pete & List , I think how it would have been
done in the Collins factory -  They would have used a Dummy PTO   Cover with
holes strategically placed   to make the adjustments , This way the
capacity   of the cover would be taken into account, So one needs to find a
Tin can at the  supermarket that's the same dia ,That would be my approach
to the problem !----- Original Message ----- 
From: <r-390-request at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Friday, October 24, 2008 6:04 PM
Subject: R-390 Digest, Vol 54, Issue 22


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> Today's Topics:
>
>    1. Collins PTO Linearity adjust (Pete Williams)
>    2. Re: Collins PTO Linearity adjust (ews265)
>    3. R-390A Antenna Relay Assembly (Richard W. Solomon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 23 Oct 2008 22:50:18 +1000
> From: "Pete Williams" <jupete at bigpond.net.au>
> Subject: [R-390] Collins PTO Linearity adjust
> To: <r-390 at mailman.qth.net>
> Message-ID: <94EC3F3637394F0BB711F88D37BE8A21 at redooffice>
> Content-Type: text/plain; charset="us-ascii"
>
> G'Day List...having rejuvenated a couple of  Collins 70-H2 pto,is there
info
> available as to how best adjust the internal cams for linearity.?
>
> I have read Ray Osterwalds comments ex past issue of ER but this only
> addresses the 100kHz -one  turn of the shaft-calibration points.
>
> It would seem to be  laborious process to adjust these cams as there are
in
> excess of 60 for the  complete travel of the  core, although, they are not
> all required for  adjustment for the 1 mHz  range .
>
> How the factory did it is one thing-- how one might do it now is  another
>
> My preliminary excursion into this finesse  appears to show that adjusting
> at the 100kHz points seems to take reasonable  care of what's in between,
> bit I'm sure there was a bit more to it, albeit labor intensive .
> A bit more light on this would be  appreciated.
> Tks
> Pete VK3IZ
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 23 Oct 2008 09:27:39 -0400
> From: ews265 <ews265 at rochester.rr.com>
> Subject: Re: [R-390] Collins PTO Linearity adjust
> To: r-390 at mailman.qth.net
> Message-ID: <49007BCB.1020403 at rochester.rr.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Good morning  Pete and list,
>
> I've pondered the same issues.  Came to the conclusion that for the kind
> of mechanical resetability needed to make the job manageable a stepping
> motor was needed.  Granted a complex solution but the most exact
> arrangement I could come up with.  To that end I've got all the
> mechanics of a fixture built; PTO mount, stepper, driver, etc.  It's
> very solid and should work well.  I've yet to write the software to run
> everything so I can't offer direct help now but throw the idea out to
> you or anyone interested.
>
> Regards,
> Jon Schlegel  WA3MVM
>
>
> Pete Williams wrote:
> > G'Day List...having rejuvenated a couple of  Collins 70-H2 pto,is there
info
> > available as to how best adjust the internal cams for linearity.?
> >
> > I have read Ray Osterwalds comments ex past issue of ER but this only
> > addresses the 100kHz -one  turn of the shaft-calibration points.
> >
> > It would seem to be  laborious process to adjust these cams as there are
in
> > excess of 60 for the  complete travel of the  core, although, they are
not
> > all required for  adjustment for the 1 mHz  range .
> >
> > How the factory did it is one thing-- how one might do it now is
another
> >
> > My preliminary excursion into this finesse  appears to show that
adjusting
> > at the 100kHz points seems to take reasonable  care of what's in
between,
> > bit I'm sure there was a bit more to it, albeit labor intensive .
> > A bit more light on this would be  appreciated.
> > Tks
> > Pete VK3IZ
> >
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>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 23 Oct 2008 16:35:36 -0700 (GMT-07:00)
> From: "Richard W. Solomon" <w1ksz at earthlink.net>
> Subject: [R-390] R-390A Antenna Relay Assembly
> To: r-390 at mailman.qth.net
> Message-ID:
> <20763644.1224804936488.JavaMail.root at elwamui-ovcar.atl.sa.earthlink.net>
>
> Content-Type: text/plain; charset=UTF-8
>
> I picked up a very grungy R-390A yesterday. The last one I had
> was back in the 70's !! Anyway, it is missing the Antenna Relay
> Assembly. One of the Coax Leads has a BNC adapter on it so it
> looks like I can at least put an antenna on it.
> How hard (read $$$) is it to get one of these assemblies ? Does
> anyone have one or know where I can find one ? I checked Fair Radio
> and they had none listed.
>
> Thanks, Dick, W1KSZ
>
>
> ------------------------------
>
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> End of R-390 Digest, Vol 54, Issue 22
> *************************************


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