[amsat-bb] AO-7 CW FSK shift measurements

[Dquagliana@xxxxxxx]

Larry Kayser VA3LK asks:
>It would be interesting if someone would get a good measurement on the 
>actual FSK shift on the AO7 435.1 beacon now.  
>[snip]
>It is of  interest to me to find out what the FSK value has become 
>after all these years.

Hi Larry,

Short answer : very close to  800 Hertz between the two tones.

Slightly longer answer:
Based on a section of a WAVE file recording of the FSK beacon
(provided to me by Jim Walls, thanks again Jim!) the two tones
appear to be very close to 800 Hertz apart.  However, the high tone
gains a little bit during its transmission and the low tone is losing 
a little bit during its transmission.  Each tone quickly stabilizes.
Nominally about 800 Hertz apart based on the stable sections.
  
Your milage probably will vary.

Larry: What *WAS* the value of the FSK shift you determined
years ago ?

Douglas KA2UPW
"Hey, has anyone got a recording of the BAUDOT TTY ?"
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