cocoaModem MFSK Interface
Kok Chen, W7AY
[w7ay (at) arrl
(dot) net]
Last updated: July 18, 2007
Index (User's Manual - MFSK Interface)
General Information
Aural Monitor
Accessibility (Incremental Speak and Voice Assist)
Macros
RTTY Interfaces
PSK Interface
MFSK Interface
Hellschreiber Interface
CW Interface
ASCII Interface
SITOR-B Receiver
HF-FAX Receiver
Synchronous AM Receiver
Versions
Part II
MFSK Interface
Amateur RTTY is transmitted using Frequency Shift Keyed (FSK) modulation. With FSK, two tones are alternately turned on and off to encode a bit stream. With 45.45 baud RTTY, the shortest duration of a tone is 22 ms and the two tones are separated in the spectrum by 170 Hz.
With Multiple Frequency Shift Keying (MFSK, also known as M-ary FSK in the literature), the signal can have more than two tones. DominoEX consists of 18 tones and MFSK16 has 16 tones. Like RTTY, both DominoEX and MFSK16 have 100% duty cycle; at all times one and only one tone is present.
DominoEX Interface
For details on the DominoEX interface go to the DominoEX Interface page.
MFSK16 Interface
For details on the MFSK16 interface go to the MFSK16 Interface page.
Configuration
The MFSK interface's configuration follows the general
procedures shown here. As usual, the Configuration panel
can be opend by selecting the Config item under the
Window menu in the main menu bar. DominoEX and MFSK16
specific preferences are discussed in the pages above.
Next (Hellschreiber Interface)