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Make Contest Mode messages properly readable by anyone in the sender's

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hemisphere.  Add Contest Mode info to User Guide.


git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7395 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2016-12-18 02:46:04 +00:00
parent f4b764ee85
commit 4cd038f342
3 changed files with 36 additions and 16 deletions
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9
doc/user_guide/en/protocols.adoc
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@ -274,6 +274,15 @@ with constant envelope, equivalent to a Minimum Shift Keying (MSK)
waveform. Frame duration is 72 ms, so the effective character waveform. Frame duration is 72 ms, so the effective character
transmission rate for standard messages is up to 250 cps. transmission rate for standard messages is up to 250 cps.
Contest Mode in MSK144 conveys an additional acknowledgment bit (the
"`R`" in a message of the form `W9XYZ K1ABC R FN42`) by using the fact
that meteor scatter and other propagation modes usable with MSK144 are
generally effective only out to distances of order 2500 km. To convey
the message fragment `R FN42`, WSJT-X encodes the locator as that of
its antipodes. The receiving program recognizes a locator with
distance greater than 10,000 km, does the reverse transformation, and
inserts the implied "`R`".
MSK144 also supports short-form messages that can be used after QSO MSK144 also supports short-form messages that can be used after QSO
partners have exchanged both callsigns. Short messages consist of 4 partners have exchanged both callsigns. Short messages consist of 4
bits encoding a signal report, R+report, RRR, or 73, together with a bits encoding a signal report, R+report, RRR, or 73, together with a

15
doc/user_guide/en/vhf-features.adoc
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@ -271,6 +271,21 @@ messages at 50 or 70 MHz. At these frequencies, most pings are long
enough to support standard messages -- which have the advantage of enough to support standard messages -- which have the advantage of
being readable by anyone listening in. being readable by anyone listening in.
- A special *Contest Mode* for MSK144 can be activated by checking a
box on the *Settings | Advanced* tab. This mode is configured
especially for VHF contests in which four-character grid locators are
the required exchange. When *Contest Mode* is active, the standard QSO
sequence looks like this:
CQ K1ABC FN42
K1ABC W9XYZ EN37
W9XYZ K1ABC R FN42
K1ABC W9XYZ RRR
W9XYZ K1ABC 73
In contest circumstances K1ABC might choose to call CQ again rather
than sending 73 for his third transmission.
=== Echo Mode === Echo Mode
*Echo* mode allows you to make sensitive measurements of your own *Echo* mode allows you to make sensitive measurements of your own

28
lib/fix_contest_msg.f90
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@ -5,25 +5,21 @@ subroutine fix_contest_msg(mycall,mygrid,hiscall,msg)
! of grid1. ! of grid1.
character*6 mycall,mygrid,hiscall character*6 mycall,mygrid,hiscall
character*22 msg,t character*22 msg
character*6 g1,g2 character*6 g1,g2
logical isgrid logical isgrid
t=trim(mycall)//' '//trim(hiscall) n=len(trim(msg))
i0=index(msg,trim(t)) g1=msg(n-3:n)//' '
if(i0.eq.1) then if(isgrid(g1)) then
i1=len(trim(t))+2 call azdist(mygrid,g1,0.d0,nAz,nEl,nDmiles,nDkm,nHotAz,nHotABetter)
g1=msg(i1:i1+3) if(ndkm.gt.10000) then
if(isgrid(g1)) then call grid2deg(g1,dlong,dlat)
call azdist(mygrid,g1,0.d0,nAz,nEl,nDmiles,nDkm,nHotAz,nHotABetter) dlong=dlong+180.0
if(ndkm.gt.10000) then if(dlong.gt.180.0) dlong=dlong-360.0
call grid2deg(g1,dlong,dlat) dlat=-dlat
dlong=dlong+180.0 call deg2grid(dlong,dlat,g2)
if(dlong.gt.180.0) dlong=dlong-360.0 msg=msg(1:n-4)//'R '//g2(1:4)
dlat=-dlat
call deg2grid(dlong,dlat,g2)
msg=msg(1:i1-1)//'R '//g2(1:4)
endif
endif endif
endif endif