"Dave Platt" wrote in message
...
In article .com,
wrote:

yes, that is what i meant. i didn't even know amplitude shift keying
existed.

am i correct about afsk being audio tones transmitted over FM, while
fsk is just alternating between two non-modulating frequencies?

That's pretty close, but not exactly on target.

AFSK can be used on top of either AM or FM. In amateur systems it's
most commonly used with FM.

That is not correct either. AFSK is used extensively with Amateur Radio
digital systems, such as PSK-31, RTTY, even CW can be and is generated
using AFSK. And the modulation METHOD is not important. It can be either
Amplitude or Frequency Modulation.

Dan/W4NTI


FSK shifts the carrier frequency... a process which counts as a
modulation. The amount of frequency shift (in Hz) and the rate at
which you shift it (also in Hz) vary a lot from one usage to another.
There are both narrow-band and wide-band FSK modulations in use.

--
Dave Platt AE6EO
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