----- Original Message ----- 
From: Pierre Terrier 
To: Riccardo Ricci 
Sent: Wednesday, September 19, 2001 10:53 AM
Subject: Meteor scatter interface


Ciao Riccardo,
 
Sorry, I don't speak Italian...  (for an French is bad !)
Well my Interface is close to first stage of an frequencies meter.
He produce an modulation close to the PWM pulse.

My program integrate this pulse modulation to obtain an sufficient 
value for a display one curve under the screen of the computer. 

This Integrate fluctuating in function of the speed of the computer.
The amplitude of the curve doesn't depend of the level in input of the interface.
Only of the variations of frequencies.
If it is available for you put an low frequencies generator 
signal (50 to 1v range) in the input of interface. 
Then change the frequencies value.  

The low frequencies eg. 50Hz is displayed in one right 
line at top of the screen. 
If you change the frequencies toward hight (max 8000Hz) Meteor display an 
right line  at bottom of the screen. Is an small (and poor resolution) electronic 
spectrum analyser, without sound card and FFT transform.
 
I hope that my answer is understandable  !
 
Amitiés,
Pierre