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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 18th Dec 2012, 11:56 pm   #1
Phil G4SPZ
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Default Circuit sought for Test Oscillator TS-47/APR

This is a 1945 vintage US Signal Corps VHF - AM oscillator covering 40 to 500 Mc/s in two bands, made by Fairchild. I'm told they are rare in the UK.

If anyone has a manual or circuit or can suggest a (preferably free!) source, it would be much appreciated.

Many thanks,

Phil
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Last edited by Phil G4SPZ; 18th Dec 2012 at 11:57 pm. Reason: Additional info included
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Old 19th Dec 2012, 8:35 pm   #2
Paul Adams
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Phil,
That looks a bit of a beast, the only reference that I could find on the web is This.
Never really purchased anything from there, so cannot comment.
HTH,

Paul.
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Old 19th Dec 2012, 8:39 pm   #3
Paul Adams
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Phil,
Sorry just noticed that it's currently unavailable see here

Paul.
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Old 22nd Dec 2012, 12:35 am   #4
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Hello Paul, hope you're well and thanks for your help.

I've tried out this unit, and it produces a signal and the calibration is not far out according to my Hunter 2GHz frequency counter, but the 1kHz modulation is absent so it needs some work. The valves are both type 9002, and luckily I have several spares. Even without a circuit diagram it shouldn't be too difficult to restore it to full working order.

Kind regards, and nice to see your latest Avo 8 resurrection!

Phil
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Old 15th Mar 2013, 5:25 pm   #5
Chaparal
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Manual info - better than nothing ;-)

Peter
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Old 3rd Dec 2014, 7:00 pm   #6
Phil G4SPZ
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Default Re: Circuit sought for Test Oscillator TS-47/APR

I am so sorry! I completely missed your posting. Thank you very much for this information, your help is really appreciated. I am sorry I did not acknowledge your message at the time.

Thank you once again,

Phil
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Old 4th Dec 2014, 3:42 pm   #7
short wave
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Hi Phil
found some general info on your TS-47 see link ( its 362 pages long but try pages 207, 208) Regards S-W

http://www.virhistory.com/navy/manua...-testequip.pdf
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Old 4th Dec 2014, 5:27 pm   #8
M0FYA Andy
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Have you tried Robert Downs at WA5CAB@cs.com ?
He is the guru for US military manuals.
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Old 4th Dec 2014, 6:03 pm   #9
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Default Re: Circuit sought for Test Oscillator TS-47/APR

S-W, thanks for that link, I had already found it but it contains no circuit or component information.

Andy, thanks for that address, I'll give him a try.

Cheers and thanks again,

Phil
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Old 11th Dec 2014, 6:11 am   #10
WB6NVH-GEOFF
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Default Re: Circuit sought for Test Oscillator TS-47/APR

Once upon a time I had several of these along with the manual.
I think I have the manual but will have to look for it. There was an article about these in 73 Magazine circa 1961 or 1962 and I think that has the schematic. 73 is available for free viewing on the web but I do not have the URL of the site hosting them at hand.

If all that is wrong is that the modulation isn't working, these are so simple that you should be able to fix it without a schematic. Just check all the resistors (in-circuit is OK) for any that have gone high or open, and consider replacing any paper capacitors as well as suspecting the bathtub capacitor/s. Can't remember if there are any paper capacitors in there.

These were originally used during the war to check the SCR-522 and ARC-1 / ARC-4 VHF radios on the flight line before take-off.

I'll post back here if I turn up the manual. It was just a few pages stapled together as I recall.
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