On Tue, 9 Sep 2003 14:24:43 -0700, "Caveat Lector"
wrote:

Ok lets simplifies it

No need I've been sending and receiving RTTY for years so I know what
FSK and AFSK is and what it sounds like.
The question was..
Which frequency is the carrier frequency as regards HF and VHF
Beacons, and I suppose A/FSK data, in the Amateur service.
The Mark, the Space or in the middle for Amateur usage ( the frequency
you log in your logbook ).
Keying can be normal or inverted making the space either higher or
lower than the mark so saying that the mark is the carrier frequency..
occasionally.. is'nt much use is it ?.

Does this URL help
http://www.ref-union.org/thf/9aa2.pdf

--
73 From The Signal In The Noise
Caveat Lector Ya All
"Mike W" wrote in message
...
On Tue, 9 Sep 2003 14:24:43 -0700, "Caveat Lector"
wrote:

Ok lets simplifies it

No need I've been sending and receiving RTTY for years so I know what
FSK and AFSK is and what it sounds like.
The question was..
Which frequency is the carrier frequency as regards HF and VHF
Beacons, and I suppose A/FSK data, in the Amateur service.
The Mark, the Space or in the middle for Amateur usage ( the frequency
you log in your logbook ).
Keying can be normal or inverted making the space either higher or
lower than the mark so saying that the mark is the carrier frequency..
occasionally.. is'nt much use is it ?.

I believe it is pretty much standard that the Mark is the lower RF
frequency. For AFSK using a SSB transmitter that means that the audio
Mark tone is the higher frequency and the transmitter is set to LSB
which inverts it to the lower RF frequency.

For amateur and most commercial operation, the RF Mark frequency is
generally given as the assigned frequency. The military uses the
center, half way between Mark and Space as the assigned frequency.
Because they assign channel frequencies as the center of the assigned
bandwidth, this always puts the FSK signal in the center of the
channel.

Does this URL help
http://www.ref-union.org/thf/9aa2.pdf

--
73 From The Signal In The Noise
Caveat Lector Ya All
"Mike W" wrote in message
...
On Tue, 9 Sep 2003 14:24:43 -0700, "Caveat Lector"
wrote:

Ok lets simplifies it

No need I've been sending and receiving RTTY for years so I know what
FSK and AFSK is and what it sounds like.
The question was..
Which frequency is the carrier frequency as regards HF and VHF
Beacons, and I suppose A/FSK data, in the Amateur service.
The Mark, the Space or in the middle for Amateur usage ( the frequency
you log in your logbook ).
Keying can be normal or inverted making the space either higher or
lower than the mark so saying that the mark is the carrier frequency..
occasionally.. is'nt much use is it ?.

I believe it is pretty much standard that the Mark is the lower RF
frequency. For AFSK using a SSB transmitter that means that the audio
Mark tone is the higher frequency and the transmitter is set to LSB
which inverts it to the lower RF frequency.

For amateur and most commercial operation, the RF Mark frequency is
generally given as the assigned frequency. The military uses the
center, half way between Mark and Space as the assigned frequency.
Because they assign channel frequencies as the center of the assigned
bandwidth, this always puts the FSK signal in the center of the
channel.