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Author Topic: help needed...........  (Read 3052 times)
K5BDJ
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Posts: 18




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« on: February 07, 2013, 08:39:40 PM »

Years back, I got hold of and still have a neat vacuum variable condser driven by what looks to be a Collins auto-tune thing for something or other.   Has some logic in it for stop-starts, and a neat motor drive.   I would like to use it.   Fair Radio sold a bunch years back.   

I know way back there were some schematics of this floating around.   Like a ninny, I didn't capture one.

If anyone has the schematic for it, please post or send to my email of rbig at cox dot net.
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KE3WD
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Posts: 5694




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« Reply #1 on: February 08, 2013, 06:40:03 AM »

Any ID, numbers, model, mfr. etc. actually on the thing? 

If so, including whatever you find there may be a big help to yourself. 


73
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K5BDJ
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Posts: 18




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« Reply #2 on: February 08, 2013, 06:50:22 AM »

Yes.   That's a nice way of telling me I forgot to add those in.   

Not much, but here's some:

UCSL-1000 3d345

Could be a P/N:  506 0943 003 03

I have no idea what these may be:   73905    and    7049

No other marks.   I have googled all these, and nothing so far.   It doesn't say so on it, but I'm sure this from a Collins module. 
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KC4MOP
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Posts: 731




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« Reply #3 on: February 08, 2013, 07:09:21 AM »

A picture of the unit would help if you could. Do you have a PhotoBucket account?

Fred
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K5BDJ
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Posts: 18




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« Reply #4 on: February 08, 2013, 07:15:40 AM »

Things are piling up, here.  It will take me several days before I put a photo up.   
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K5BDJ
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Posts: 18




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« Reply #5 on: February 08, 2013, 09:59:48 AM »

Well, would't ya know it:  just got a break. 

It's nice unit, and I'd like to use it as-is.   

I've snapped a couple of pics of it, and put 'em on photobucket.   I don't know what to do next.    Advice appreciated.

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K5BDJ
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Posts: 18




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« Reply #6 on: February 09, 2013, 09:30:40 AM »

I think I finally figured out how to do it.   Hopefully, these are the pics:

http://i659.photobucket.com/albums/uu313/rbigg/auto%20tune/misc013-1.jpg

http://i659.photobucket.com/albums/uu313/rbigg/auto%20tune/misc014.jpg


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KE3WD
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Posts: 5694




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« Reply #7 on: February 09, 2013, 12:21:08 PM »

Did you ever try contacting Fair Radio directly, just in case they might still be able to suppl a reprint of whatever documentation they had for the thing? 

If it was me, I'd try a telephone call and break out the gift of gab skills, never know what you can get with a kind word. 


73
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KE3WD
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« Reply #8 on: February 09, 2013, 12:25:20 PM »

BTW all I can detect from the two pics are the electromechanicals.  

That would be basic motor drives and limit switches, possibly some position feedback (which was often done with a simple potentiometer and a DC voltage, but not always.   

Use of the D connector was rather common but does not necessarily mean there is any ttl logic or the likes in the thing.  

See if Fair can supply whatever they had for documentation, likely would be some clues on voltages and pinout.  


73
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G3RZP
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Posts: 4447




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« Reply #9 on: February 10, 2013, 12:40:11 AM »

It is out of the antenna tuner for the Collins 618T airborne HF transceiver. More precisely, the 180L tuner. The autotune  was done by phase detectors.

John, G6RAV, has done some work on  this equipment and published descriptions in the Vintage and Military Amateur Radio Society journal 'Signal'. An email to honsec(at)vmars.org.uk  - with @ instead of (at), of course - and he may be able to help.

73

Peter G3RZP
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K5BDJ
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Posts: 18




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« Reply #10 on: February 10, 2013, 08:07:20 AM »

G3RZP has identified it for me.    THANKS!   

I should be able to come up with the schematics, now, no problem.

Thanks to all who responded.   
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G3RZP
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« Reply #11 on: February 10, 2013, 11:48:09 AM »

Glad to be able to help!

73

Peter G3RZP
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