[Milsurplus] Viz radiosonde ?

[Michael Bittner]

The modulator had a 6-inch vinyl disc turned by a 3-Volt DC motor.  The grooves in this disc were not spiral but concentric, and each had different dot/dash code on a 90-degree sector of the disc.  This sector was raised above the regular top surface of the disc a small amount, apparently by pressing the disc onto a die with this distorted surface.  As the pressure bellows in the modulator moved a stylus across the disc with changing altitude, much like the tone arm moves on a record player, the stylus would pick up the code for the particular grove that is happened to be over when the raised sector of the disc passed under it. 

IMHO this is one very Rube Goldberg way of sending altitude.  I don't remember why there were three stylie.  I hope this explains it.

Mike, W6MAB
  ----- Original Message ----- 
  From: arc5 at ix.netcom.com 
  To: mmab at cox.net ; Kargo_cult at msn.com ; tetrode at googlegroups.com ; Milsurplus at mailman.qth.net 
  Sent: Saturday, March 18, 2017 4:29 PM
  Subject: Re: [Milsurplus] Viz radiosonde ?


  What is the "record motor" and stylie all about?




  Sent from my Ain't Smart Phone.





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