[Milsurplus] AN/AMT-3

[Michael Bittner]

The altitude part is easy, a bellows (aneroid barometer), that expands or 
contracts with changing pressure, moves a lever arm across the different 
grooves on the disk.  Note that the un-raised 3/4 ths of the disk allows the 
lever arm to freely disengage from one groove and move to another.

But darned if I know how temperature and humidity were done.  In other 
radiosondes, separate resistive elements that change resistance with 
temperature and humidity are switched into a blocking oscillator to change 
its frequency and then modulate the transmitter.  Similarly, the altitude 
lever arm functions as the arm of a potentiometer.  But that doesn't seem to 
be the case with this AMT-3.

Mike, W6MAB

----- Original Message ----- 
From: "David Stinson" <arc5 at ix.netcom.com>
To: <milsurplus at mailman.qth.net>
Sent: Monday, September 24, 2018 04:05
Subject: Re: [Milsurplus] AN/AMT-3


>I looked at the diagram for this transmitter.
> https://photos.app.goo.gl/7oEGRkZmZZnSDyK2A
> Y'all have probably said, but I missed it, sorry.
> Where is the "data element," the transducer or
> other part that does the "changing" to provide
> the data the users sought?


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