[R-390] PTO Connector

[Jon Schlegel]

John,

The one I got from Fair came from the link below.  I still have it (a 
Progresstron) and installed a new power connector I found here in the 
junk bin to replace the smashed connector that came with the 
unit.  Inside, the PTO looks physically perfect.  How similar a unit 
you might get from Fair is anybody's guess.

I have yet to actually try it but I initially suspected it was 
removed from service because of excessive backlash.  If you put the 
Oldham coupler plate on and turned the shaft, you could see it spring 
backwards a little upon letting go.  Since talking with Bob Camp in 
some depth I find out that many of these PTOs had problems with 
endpoint adjustment and now I have to consider that as a possible 
reason as to why it was pulled.

I'll know more when I get the radio up and running.  Endpoints will 
probably be the first thing I scrutinize...

Regards,
Jon



At 03:30 AM 11/23/2007 +0000, you wrote:
>Jon,
>
>Did you send your PTO back to Fair radio or is the one in the URL 
>another unit like yours?
>
>Thanks for notifying me.
>
>John
>
>
>
>-------------- Original message --------------
>From: Jon Schlegel <ews265 at rochester.rr.com>
>John,
>
>This is it.  $26.50.  Expect the connector to be broken.  Guess they 
>did that so removed units wouldn't make it back into radios.
>
>http://www.fairradio.com/catalog.php?mode=search&query=VARIABLE+FREQUENCY+OSCILLATOR+from+R-390A&submit.x=9&submit.y=13 
>
>
>I'm guessing it's the O ring because when you turn the shaft and let 
>go, you can actually see the shaft rotate backwards a little 
>bit.  BTW, there is an O ring in there, isn't there???
>
>Good luck with the rx on 80.
>
>Regards,
>Jon  WA3MVM
>
>
>
>At 02:55 AM 11/13/2007 +0000, you wrote:
>>Jon,
>>
>>Thanks for the response.  I called Fair Radio a while back and 
>>asked if they had any scrap PTOs and they said "no".  They are too 
>>expensive on eBay.
>>
>>No pressure.  I am actually looking to build a capacitor tuned 
>>oscillator with a fixed coil.  I have a very nice HP310 wavemeter 
>>linear variable capacitor and I plan to build an 80 meter receiver 
>>with the VFO and an R390nonA IF strip.  I have a really rusted out 
>>R390A chassis with T208 that I will use to feed the IF deck with.
>>
>>Best of luck on the O ring.    I have torn several PTOs down and 
>>usually the back lash is caused by not having the slug pushed up 
>>against the threads tight enough.
>>
>>John
>>
>>-------------- Original message --------------
>>From: Jon Schlegel <ews265 at rochester.rr.com>
>>John,
>>I plan on keeping it for now but the one I got as scrap is from 
>>Fair Radio.  It was $26 and some change.  I think there's an O ring 
>>around the shaft that may have swollen some causing the 
>>backlash.  I'll probably just remove it and see if that 
>>helps.  Other than that it's perfect inside.  That was the one I 
>>ended up with, at least.  Be prepared for a broken connector, though.
>>Regards,
>>Jon
>>At 02:01 AM 11/13/2007 +0000, you wrote:
>>>Jon,
>>>
>>>I am looking for a scrap R390 or R390A PTO.  If you wind up 
>>>getting rid of your Presstron I would be happy to buy it.  The 
>>>backlash may be a simple adjustment of the pressue on the threads.
>>>
>>>Thanks,
>>>
>>>John Zimmerman
>>>
>>>-------------- Original message --------------
>>>From: Jon Schlegel <ews265 at rochester.rr.com>
>>> > Hi All,
>>> >
>>> > I'm looking for a source for the round, blue Amphenol connector
>>> > that's part of the PTO assembly. It's the male connector, 9 pins
>>> > that's mounted to the triangular bracket attached to the back end of
>>> > the PTO. An Amphenol part number for this connector would also 
>>> be a help.
>>> >
>>> > I got a scrap PTO from Fair Radio (appears to be a Progresstron)
>>> > expecting to use it for parts. The condition of the unit inside is
>>> > picture perfect. I'm not able to check it's electrical functionality
>>> > yet but the shaft has observable rotational backlash and I suspect
>>> > that was why it was pulled from service.
>>> >
>>> > I'm almost finished rebuilding the original PTO from my 390A but
>>> > would like to get this Fair Radio PTO running also. For Our
>>> > convenience however, the blue Amphenol connector has been smashed
>>> > beyond repair, no doubt to make sure the bad unit didn't get 
>>> back into service.
>>> >
>>> > Anyway, if anyone has a line on a source of these connectors or their
>>> > Amphenol part number, I would certainly appreciate it.
>>> >
>>> > Regards,
>>> > Jon
>>> >
>>> >
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