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From:         Richard Graziano <rgrazia1@ROCHESTER.RR.COM>
Subject: Re: [EE:] [AR] Altimeter
To:           PICLIST@MITVMA.MIT.EDU
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The old Radio Sende weather balloons used a small double aneroid barometer
with an arm that swept out a variable resistor (linear taper).  Depending on
the altitude, my guess is that a similar device could be easily constructed.
The variable resistance could be used to drive a VCO for an FM transmitter,
sending altitude signals back to the ground station.


----- Original Message -----
From: "Russell McMahon" <apptech@PARADISE.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, February 01, 2004 9:58 PM
Subject: Re: [EE:] [AR] Altimeter


> > Do you have any specifications, such as accuracy you need to assure,
size,
> > weight, etc.?
>
> This was actually a response to a question on another list (Arocket). The
> aim will be to go in as small as possible a rocket body tube, accuracy in
> the few percent range and low cost. (I base these assumed answers on the
> original list and the fact that commercial altimeters are available at
$US50
> up  with accuracies of as bad as 10% (unacceptable for almost any
> application IMO) down to better than 0.1% or so. The latter are calibrated
> in barometric chambers and are cost typically several hundred dollars US.
>
>
>         RM
>
> --
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