In a message dated 11/07/06, jmhannon@......... writes:

> Each radio signal can transmit up to 8 channels of data. Each channel is 
> assigned a center frequency per the chart below. To send data a tone either 125 
> Hz above the center frequency or 125 Hz below the center frequency is 
> transmitted. A logic one or zero is signified by the tone being above or below the 
> center frequency.

Hi Jim,

http://www.geotool.com/geoseis.htm

> This exciting new computer program uses any good quality scanner radio to 
> demodulate standard and non-standard telemetry frequencies. The sound card in 
> your computer converts the telemetry tone to digital information. The program 
> runs under Windows 98, and is anticipated to provide 12 to 16 bit data from 
> the telemetry signal. We are truly excited about the breakthrough sound card 
> programming technology provided by Silicon Pixels. 
    
       Some links were narrow band modulation using the actual seismic signal 
and FM modulation, not a digital signal with FSK tones. Hence the 20 ppm 
stability of the XR2206. Which critter are we talking about?

       Regards,

       Chris Chapman

In a me=
ssage dated 11/07/06, jmhannon@......... writes:



Each radio signal can transmit=20=
up to 8 channels of data. Each channel is assigned a center frequency per th=
e chart below. To send data a tone either 125 Hz above the center frequency=20=
or 125 Hz below the center frequency is transmitted. A logic one or zero is=20=
signified by the tone being above or below the center frequency.



Hi Jim,



http://www.geotool.com/geoseis.htm



This exciting new computer prog=
ram uses any good quality scanner radio to demodulate standard and non-stand=
ard telemetry frequencies. The sound card in your computer converts the t=
elemetry tone to digital information. The program runs under Windows 98,=
 and is anticipated to provide 12 to 16 bit data from the telemetry signal.=20=
We are truly excited about the breakthrough sound card programming technolog=
y provided by Silicon Pixels. 


    

       Some links were narrow band modulation=20=
using the actual seismic signal and FM modulation, not a digital signal with=
 FSK tones. Hence the 20 ppm stability of the XR2206. Which critter are we t=
alking about?



       Regards,



       Chris Chapman