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58 lines
2.3 KiB
Plaintext
58 lines
2.3 KiB
Plaintext
To Do for FT8++
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---------------
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The following list is for informtion and general guidance. Everything
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is subject to change, and not all ideas are necessarily good ones!
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1. Nomenclature and parameters for message types
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- Old-style = classic 72-bit JT-style source-encoding
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FT8: (174,87) code: 72-bit info, i3bit, CRC12, isync=1
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MSK144: (128,80) code: 72-bit info, CRC8
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- New-style
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FT8: (174,91) code: 74+3+14, sync uses isync=2
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MSK144: (128,90) code: 74+3+13
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2. (K1JT) For backward compatibility (good for, say, 6 months only?),
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by default we'll generate old-style messages where possible, new-style
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messages where they are needed. We'll decode both old and new types.
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3. (K1JT -- DONE) Two new checkboxes on Advanced tab to enable 77-bit
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messages:
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- "Always generate new-style (77-bit) messages."
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- "Decode only 77-bit messages
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4. (K9AN -- MOSTLY DONE) New-style messages can be as long as 37 characters. We'll
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need to allow for that in a number of places.
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5. (K9AN -- DONE) Subroutine genft8() will need to parse the message to be
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transmitted, determine the effective message type i3 and possibly
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subtype, n3. It will then generate itone, calling genft8_174_91(() if
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needed.
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6. (K1JT) Code to generate the user-readable messages for each
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specialized type of operating, e.g., NA VHF contest, EU VHF contest,
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ARRL Field Day, ARRL RTTY Roundup, use of nonstandard calls.
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7. (??) Code to do the necessary auto-sequencing for each specialized
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type of operating.
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8. (K9AN) What's needed for MSK144 with LDPC(128,90) ?
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9. (K9AN) Work on the implementation of AP decoding. For which message types
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should AP be implemented? For each message type/QSO state that will use
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AP decoding, need to create an AP decoding table that defines the number and
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type of AP decoding passes.
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==========================================================================
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The following are just ideas:
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- Options to sort/filter decoded signals
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- New Fox message type using constant-envelope waveform and higher
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symbol rate to accommodate multiple simultaneous QSOs. RR73 sent to
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0-5 calls, report sent to 0-5 calls. Decoding uses AP for missing
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calls, thereby effectively making lower-rate codes when not all
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slots are used.
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- Hound should send spots of Fox to PSK Reporter.
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