Starting to remove ISCAT references from the User Guide

Note that remaining QRA64 references need updating to mention Q65.

doc/user_guide/en/controls-functions-center.adoc

@@ -42,7 +42,7 @@ control.  The *Sync* control sets a minimum threshold for establishing
 time and frequency synchronization with a received signal.
 
 * Spinner control *T/R xx s* sets sequence lengths for transmission
-and reception in ISCAT, MSK144, and the fast JT9 modes.
+and reception in Q65, MSK144, and the fast JT9 modes.
 
 * With *Split operation* activated on the *File -> Settings -> Radio* tab, in
 MSK144 and the fast JT9 submodes you can activate the spinner control

doc/user_guide/en/decoder_notes.adoc

@@ -118,9 +118,7 @@ summarized in the following Table:
 |JT9     | @            |      |
 |JT65    | #            |      |
 |JT65 VHF| #            | *, # | f, fN, dCN
-|QRA64   | :            | *    | R:w
+|QRA65   | :            |      | qP
-
-|ISCAT   |              | *    | M  N  C  T
 |MSK144  | &            |      |
 |===========================================
 Sync character::
@@ -130,14 +128,11 @@ Sync character::
 End of line information::
  `?` - Decoded with lower confidence +
  `a` - Decoded with aid of some _a priori_ (AP) information +
- `C` - Confidence indicator [ISCAT and Deep Search; (0-9,*)] +
+ `C` - Confidence indicator [Deep Search; (0-9,*)] +
  `d` - Deep Search algorithm +
  `f` - Franke-Taylor or Fano algorithm +
- `M` - Message length (characters) +
  `N` - Number of Rx intervals or frames averaged +
  `P` - Number indicating type of AP information (Table 1, above) +
- `R` - Return code from QRA64 decoder +
- `T` - Length of analyzed region (s)
 
 Table 6 below shows the meaning of the return codes R in QRA64 mode.
 

doc/user_guide/en/introduction.adoc

@@ -8,9 +8,9 @@ as an extended branch of an earlier program, _WSJT_, first released in
 2001.  Bill Somerville, G4WJS, and Steve Franke, K9AN, have been major
 contributors to development of _WSJT-X_ since 2013 and 2015, respectively.
 
-_WSJT-X_ Version {VERSION_MAJOR}.{VERSION_MINOR} offers twelve
+_WSJT-X_ Version {VERSION_MAJOR}.{VERSION_MINOR} offers eleven
 different protocols or modes: *FST4*, *FT4*, *FT8*, *JT4*, *JT9*,
-*JT65*, *QRA64*, *ISCAT*, *MSK144*, *WSPR*, *FST4W*, and *Echo*.  The
+*JT65*, *QRA65*, *MSK144*, *WSPR*, *FST4W*, and *Echo*.  The
 first seven are designed for making reliable QSOs under weak-signal
 conditions. They use nearly identical message structure and source
 encoding.  JT65 and QRA64 were designed for EME ("`moonbounce`") on
@@ -39,14 +39,13 @@ On VHF bands and higher, QSOs are possible (by EME and other
 propagation types) at signal levels 10 to 15 dB below those required
 for CW.
 
-*ISCAT*, *MSK144*, and optionally submodes *JT9E-H* are "`fast`"
+*MSK144*, and optionally submodes *JT9E-H* are "`fast`"
 protocols designed to take advantage of brief signal enhancements from
 ionized meteor trails, aircraft scatter, and other types of scatter
 propagation. These modes use timed sequences of 5, 10, 15, or 30 s
 duration.  User messages are transmitted repeatedly at high rate (up
 to 250 characters per second for MSK144) to make good use of the
-shortest meteor-trail reflections or "`pings`".  ISCAT uses free-form
+shortest meteor-trail reflections or "`pings`".  MSK144 uses the same
-messages up to 28 characters long, while MSK144 uses the same
 structured messages as the slow modes and optionally an abbreviated
 format with hashed callsigns.  
 

doc/user_guide/en/protocols.adoc

@@ -3,9 +3,9 @@
 [[PROTOCOL_OVERVIEW]]
 === Overview
 
-All QSO modes except ISCAT use structured messages that compress
+All QSO modes use structured messages that compress
-user-readable information into fixed-length packets.  JT4, JT9, JT65,
+user-readable information into fixed-length packets.  JT4, JT9, and JT65
-and QRA64 use 72-bit payloads.  Standard messages consist of two
+use 72-bit payloads.  Standard messages consist of two
 28-bit fields normally used for callsigns and a 15-bit field for a
 grid locator, report, acknowledgment, or 73.  An additional bit flags
 a message containing arbitrary free text, up to 13 characters.
@@ -14,7 +14,7 @@ Special cases allow other information such as add-on callsign prefixes
 aim is to compress the most common messages used for minimally valid
 QSOs into a fixed 72-bit length.
 
-Information payloads for FST4, FT4, FT8, and MSK144 contain 77 bits.
+Information payloads for FST4, FT4, FT8, Q65, and MSK144 contain 77 bits.
 The 5 additional bits are used to flag special message types used for
 nonstandard callsigns, contest exchanges, FT8 DXpedition Mode, and a
 few other possibilities.  Full details have been published in QEX, see
@@ -325,46 +325,6 @@ comparable to tone spacing.
 [[FAST_MODES]]
 === Fast Modes
 
-==== ISCAT
-
-ISCAT messages are free-form, up to 28 characters in length.
-Modulation is 42-tone frequency-shift keying at 11025 / 512 = 21.533
-baud (ISCAT-A), or 11025 / 256 = 43.066 baud (ISCAT-B).  Tone
-frequencies are spaced by an amount in Hz equal to the baud rate.  The
-available character set is:
-
-----
- 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ /.?@-
-----
-
-Transmissions consist of sequences of 24 symbols: a synchronizing
-pattern of four symbols at tone numbers 0, 1, 3, and 2, followed by
-two symbols with tone number corresponding to (message length) and
-(message length + 5), and, finally, 18 symbols conveying the user's
-message, sent repeatedly character by character.  The message always
-starts with `@`, the beginning-of-message symbol, which is not
-displayed to the user.  The sync pattern and message-length indicator
-have a fixed repetition period, recurring every 24 symbols.  Message
-information occurs periodically within the 18 symbol positions set
-aside for its use, repeating at its own natural length.
-
-For example, consider the user message `CQ WA9XYZ`.  Including the
-beginning-of-message symbol `@`, the message is 10 characters long.
-Using the character sequence displayed above to indicate tone numbers,
-the transmitted message will therefore start out as shown in the first
-line below:
-
-----
- 0132AF@CQ WA9XYZ@CQ WA9X0132AFYZ@CQ WA9XYZ@CQ W0132AFA9X ...
- sync##                  sync##                 sync##
-----
-
-Note that the first six symbols (four for sync, two for message
-length) repeat every 24 symbols.  Within the 18 information-carrying
-symbols in each 24, the user message `@CQ WA9XYZ` repeats at its own
-natural length, 10 characters.  The resulting sequence is extended as
-many times as will fit into a Tx sequence.
-
 ==== JT9
 
 The JT9 slow modes all use keying rate 12000/6912 = 1.736 baud.  By contrast, with
@@ -419,8 +379,6 @@ and your QSO partner ± 200 Hz.
 |=====================================================================
 |Mode     |FEC Type   |(n,k)   | Q|Modulation Type|Keying rate (Baud)
 |Bandwidth (Hz)|Sync Energy|Tx Duration (s)
-|ISCAT-A  |   -       |  -     |42|42-FSK| 21.5 |  905  | 0.17| 1.176 
-|ISCAT-B  |   -       |  -     |42|42-FSK| 43.1 | 1809  | 0.17| 0.588 
 |JT9E     |K=32, r=1/2|(206,72)| 8| 9-FSK| 25.0 |  225  | 0.19| 3.400 
 |JT9F     |K=32, r=1/2|(206,72)| 8| 9-FSK| 50.0 |  450  | 0.19| 1.700 
 |JT9G     |K=32, r=1/2|(206,72)| 8| 9-FSK|100.0 |  900  | 0.19| 0.850 

doc/user_guide/en/vhf-features.adoc

@@ -11,7 +11,8 @@ higher bands.  These features include:
 
 - *JT65*, widely used for EME on VHF and higher bands
 
-- *QRA64*, another mode for EME
+- *QRA65*, another mode for EME, also used for tropo-, and
+   iono-scatter propagation on VHF and higher bands
 
 - *MSK144*, for meteor scatter
 
@@ -216,14 +217,6 @@ waterfall.
 
 TIP: G3WDG has prepared a more detailed tutorial on using {QRA64_EME}. 
 
-=== ISCAT
-
-ISCAT is a useful mode for signals that are weak but more or less
-steady in amplitude over several seconds or longer.  Aircraft scatter
-at 10 GHz is a good example.  ISCAT messages are free-format and may
-have any length from 1 to 28 characters.  This protocol includes no
-error-correction facility.
-
 === MSK144
 
 Meteor scatter QSOs can be made any time on the VHF bands at distances