WSJT-X/lib/77bit/todo.txt

			  To Do for FT8++
			  ---------------
			  
The following list is for informtion and general guidance.  Everything
is subject to change, and not all ideas are necessarily good ones!

1. Nomenclature and parameters for message types
   - Old-style = classic 72-bit JT-style source-encoding
        FT8:    (174,87) code: 72-bit info, i3bit, CRC12, isync=1
    MSK144: (128,80) code: 72-bit info, CRC8
   - New-style
        FT8:    (174,91) code: 74+3+14, sync uses isync=2
        MSK144: (128,90) code: 74+3+13

2. (K1JT) For backward compatibility (good for, say, 6 months only?),
by default we'll generate old-style messages where possible, new-style
messages where they are needed.  We'll decode both old and new types.

3. (K1JT -- DONE) Two new checkboxes on Advanced tab to enable 77-bit
messages:
  - "Always generate new-style (77-bit) messages."
  - "Decode only 77-bit messages

4. (K9AN -- MOSTLY DONE) New-style messages can be as long as 37
characters.  We'll need to allow for that in a number of places.

5. (K9AN -- DONE) Subroutine genft8() will need to parse the message to be
transmitted, determine the effective message type i3 and possibly
subtype, n3.  It will then generate itone, calling genft8_174_91(() if
needed.

6. (K1JT) Code to generate the user-readable messages for each
specialized type of operating, e.g., NA VHF contest, EU VHF contest,
ARRL Field Day, ARRL RTTY Roundup, use of nonstandard calls.

7. (??) Code to do the necessary auto-sequencing for each specialized
type of operating.

8. (K9AN -- MOSTLY DONE) What's needed for MSK144 with LDPC(128,90) ?
Still need to work  on Sh messages. How will genmsk_128_90 know when to
generate a Sh message? 

9. (K9AN) Work on the implementation of AP decoding. For which message types
should AP be implemented? For each message type/QSO state that will use 
AP decoding, need to create an AP decoding table that defines the number and 
type of AP decoding passes. 

==========================================================================
The following are just ideas:

- Options to sort/filter decoded signals

- New Fox message type using constant-envelope waveform and higher
  symbol rate to accommodate multiple simultaneous QSOs.  RR73 sent to
  0-5 calls, report sent to 0-5 calls.  Decoding uses AP for missing
  calls, thereby effectively making lower-rate codes when not all
  slots are used.

- Hound should send spots of Fox to PSK Reporter.