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More tweaks to user Guide.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7067 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Joe Taylor 2016-09-08 20:30:12 +00:00
parent e7c42fc9a2
commit 8b54221889
2 changed files with 26 additions and 26 deletions
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2
doc/common/links.adoc
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@ -112,7 +112,7 @@ d). Edit lines as needed. Keeping them in alphabetic order help see dupes.
:bill_somerville: mailto:g4wjs -at- c l a s s d e s i g n -dot- com [G4WJS]
:dev_mail_list: http://sourceforge.net/mailarchive/forum.php?forum_name=wsjt-devel[WSJT Developers Email List]
:dev_mail_svn: https://sourceforge.net/auth/subscriptions/[WSJT SVN Archives]
:devmail: mailto:wsjt-devel@lists.sourceforge.net[wsjt-devel]
:devmail: mailto:wsjt-devel@lists.sourceforge.net[wsjt-devel@lists.sourceforge.net]
:devmail1: mailto:wsjt-devel@lists.sourceforge.net[Post Message]
:wsjtgroup_mail: mailto:wsjtgroup@yahoogroups.com[Post Message]
:greg_beam: mailto:ki7mt@yahoo.com[KI7MT]

50
doc/user_guide/en/introduction.adoc
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@ -2,9 +2,9 @@
_WSJT-X_ is a computer program designed to facilitate basic amateur
radio communication using very weak signals. The first four letters in
the program name stand for "`Weak Signal communication by K1JT,`" while
the suffix "`-X`" indicates that _WSJT-X_ started as an extended (and
experimental) branch of the program _WSJT_.
the program name stand for "`Weak Signal communication by K1JT,`"
while the suffix "`-X`" indicates that _WSJT-X_ started as an extended
(and originally experimental) branch of the program _WSJT_.
_WSJT-X_ Version 1.7 offers eight protocols or "`modes`": *JT4*,
*JT9*, *JT65*, *QRA64*, *WSPR*, *Echo*, *ISCAT*, and *MSK144*. The
@ -15,29 +15,29 @@ and source encoding. JT65 and QRA64 were designed for EME
effective for worldwide QRP communication on the HF bands. QRA64 has
a number of advantages over JT65, including better performance on the
very weakest signals. We imagine that over time it will replace JT65
for EME use. JT9 is optimized for the LF, MF, and lower HF bands. It
is 2 dB more sensitive than JT65 while using less than 10% of the
bandwidth. JT4 offers a wide variety of tone spacings and has proved
very effective for EME on microwave bands up to 24 GHz. All of these
"`slow`" modes use one-minute timed sequences of alternating
transmission and reception, so a minimal QSO takes four to six minutes
— two or three transmissions by each station, one sending in odd UTC
minutes and the other even. On the HF bands, world-wide QSOs are
possible using power levels of a few watts (or even milliwatts) and
compromise antennas. 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.
for EME use. JT9 was designed for the LF, MF, and lower HF bands.
Its submode JT9A is 2 dB more sensitive than JT65 while using less
than 10% of the bandwidth. JT4 offers a wide variety of tone spacings
and has proved very effective for EME on microwave bands up to 24 GHz.
All of these "`slow`" modes use one-minute timed sequences of
alternating transmission and reception, so a minimal QSO takes four to
six minutes — two or three transmissions by each station, one sending
in odd UTC minutes and the other even. On the HF bands, world-wide
QSOs are possible using power levels of a few watts (or even
milliwatts) and compromise antennas. 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 *JT9E-H* are "`fast`" modes designed
to take advantage of brief signal enhancements from ionized meteor
trails 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 "`pings`". ISCAT
uses free-form messages up to 28 characters long, while MSK144 uses
the same structured messages as the slow modes together with an
abbreviated format with hashed callsigns for messages sent after
initial contact has been established.
*ISCAT*, *MSK144*, and optionally submodes *JT9E-H* are "`fast`"
protocols designed to take advantage of brief signal enhancements from
ionized meteor trails 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
"`pings`". ISCAT uses free-form messages up to 28 characters long,
while MSK144 uses the same structured messages as the slow modes
together with an abbreviated format with hashed callsigns for messages
sent after initial contact has been established between two stations.
*WSPR* (pronounced "`whisper`") stands for Weak Signal Propagation
Reporter. The WSPR protocol was designed for probing potential