[Milsurplus] AN/AMT-3

[Michael Bittner]

I don't have an AMT-3 but I have the schematic and two of the code records (See photos).  

https://photos.app.goo.gl/7oEGRkZmZZnSDyK2A

The codes are in concentric grooves located in a 90-degree raised sector (speed bump) of the disc that is in the upper right in the photo.

https://photos.app.goo.gl/dxqk4sbxab37cEXG7

Mike, W6MAB


  ----- Original Message ----- 
  From: Hubert Miller 
  To: milsurplus at mailman.qth.net 
  Sent: Sunday, September 23, 2018 10:50
  Subject: [Milsurplus] AN/AMT-3


  I was looking thru the Tele-Tech magazine for November and December 1951, at a 2-part series on the AMT-3 radiosonde.

  ( BTW, I do not know if these magazine numbers are available online. ) 

  This is the set that uses the single tube 3A4 transmitter with a 3035 kHz crystal, and untuned output. 

  I recall there used to be a pile of the transmitter section, alone, at a surplus store.

  I didn't know this radiosonde send a 2-letter Morse code signal. Isn't that kind of cute ? 

  Article says signal was picked up and decoded, using look-up table, by radio operator using BC-348-R, which means the 

  dropping aircraft, apparently. Altho a photo with the article shows a BC-342.

  I wonder if any complete AMT-3 radiosondes with the 'record disk' survived ? 
  That would be one interesting device to look inside !

  -Hue 



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