[GreenKeys] RATTS

[Eugene Hertz]

Can one or can one not use "CW" mode in a receiver and apply a BFO against the shifting carrier? Shouldnt this work too? That to me (very very novice understanding of stuff) would really explain whats going on, making discussion of USB and LSB moot, no?

Here's a questions I have had for some time and now have the nerve to ask...

If someone were to use a spectrum analyzer to look at a "rtty" signal coming in off the air, would they be able to tell if the signal was generated through ASFK or FSK? In other words, if person A were to apply an audio shifted signal to a transmitter in (say) LSB mode, and another person "B" keyed an fsk mode in a transmitter, do the signals they produce differ in any way? Could person C tell which sender is using which mode?

Thanks

> 
>Low band fsk rtty is neither usb or lsb. It is two frequencies, one for the 
>mark and one for the space tone. Ham rtty is usually sent so the space tone 
>is lower than the mark tone. The comercial rtty was so the space was the 
>higher tone. When using audio demodulators and the switch (if it has one) 
>set for normal then you receive in the lsb mode for hams on all bands and 
>usb for the comercial. YOu can use either sideband if you switch the audio 
>tones to the "reverse" position. 
>Even the 2125 and 2295 tones do not mater. Without getting in the the very 
>technical reasons, any tone pair 170hz apart can be used and the person on 
>the other end will never know the differance. 
> 
>de KU4PT 
> 
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