[Milsurplus] Viz radiosonde ?

[David I. Emery]

On Sun, Mar 19, 2017 at 12:17:45AM -0400, Al Klase wrote:
> Gang,
> 
> A couple of points RE AMT-3:
> 
> 1)  The raised sector of the record covers 90 degrees.  So, the output 
> is three 2-letter Morse groups followed by a long space.

	I defer to this description.

	If I had to guess when I had one it was in HS in 1964... and
probably last looked at one in 1965 or 1966 so my memory is a BIT foggy.

	Your description sounds better than mine... 




> 2)  No special receiver is needed.  Just an HF RX and someone to copy 
> the code.  I'm not sure if it's CW or MCW.

	I do remember a relay keying the transmitter... so I think CW.

> 3)  Each unit came with a calibration sheet to translate the code groups 
> into pressure, temperature, and relative humidity.

	Yes, as I remember it was a chart which required use of a couple
of the telemetered values to get the primary ones.


> 4)  An interesting characteristic of these things is that the styli make 
> an audible buzz as they contact the raised sector.  So if you just apply 
> 3 volts to the motor, you can read the code.
> 
> I think I have one in storage.  I'll see if I can get it going and post 
> a video.


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."