HOLY CRUD! The combo of Yahoo Mail and the reflector really trashed the
formatting on my last message - maybe this one will be better.-
Very well written and thought out Marshall. Thanks for that and for opening
the discussion of FT8 use during a VHF contest. With a Flex 6700 I run a
separate panadapter and RX slices that monitor both MSK144 and FT8 all the time
with multiple instances of WSJT-X decoding them. Here are some thoughts,
experiences and maybe some different perspectives for further discussion.-
1.There is no doubt of the value of having this tool for when the band is
“closed” to CW/SSB or at least unavailable for most stations (i.e. without
large antenna arrays). It definitely takes advantage of marginal Es conditions
and short bubbles like no other can. -
2.It is however most useful for signals that are steady or slowly fading up and
down. It becomes upset and will not decode when there are sudden changes like
meteor pings, doppler, rapid fading from ionoscatter, multipath and a host of
other propagation anomalies often found on 6M. As such it can be very
frustrating causing traces to appear and disappear with few if any decodes. I
believe some of these anomalies are responsible for the “one and done” type
decodes we often get.-
3. The Contest Mode needs to be better documented in the manual. It may be
obvious to us but the checkbox for contest mode does not even appear in the FT8
window unless you have Enable VHF, UHF and Microwave features checked in the
settings. This is not discussed in the FT8 section of the manual nor is it
mentioned in the section that discusses these features. -
4.There is a pop up prompt that asks you if you should be in contest mode when
you are in the “normal” report mode and receive a “funny number” grid. If you
say yes it will put you in contest mode for that QSO and advance normally, but
it will revert back for the next one. I’m not sure why stations just don’t
say yes or just fail open on this. Maybe they just don’t understand what it
means. I suspect since the program can detect this it could be made to “force”
contest mode, but the developers apparently decided not to do that.-
5.VHF Contest mode is NOT used in Europe only NA. The manual says in section 17
that it should not be used when there is international DX involved and its due
to the due the reciprocal grid square kludge they had to use to make contest
mode work (it was an afterthought). Using contest mode all the time on 6M and
above could really mess up working DX. Worse there are Eurocentric knockoff
programs that also decode FT8 like FTDX that don’t even HAVE contest mode since
it is of no use to Europeans or HF stations. Apparently a lot of domestic
stations are using these knockoffs.-
6.Unlike Marshall’s crew some stations continue to call on FT8 even when the
band is open. This is not productive. Crowding of several strong signals into
one RX bandwidth will cause most receivers to overload and WSJT to fail to
decode all the signals in the passband. -
7.Not sure why some seem to insist that you reply on their offset but I saw
that too. It’s actually better not to since if several stations reply at once
they will QRM each other. The program will actually stop you from TXing if it
sees you on the same offset when it decodes another station working him.
Section 7 of this operating guide addresses this.
https://www.physics.princeton.edu/pulsar/K1JT/FT8_Operating_Tips.pdf -
8.Rovers do have difficulty using /R. Right now it can be ambiguous who the
rover is calling/working. Receiving some TX messages from a rover now can make
the auto sequencing advance on stations that are NOT working the rover. Some
ambiguity can be alieved by changing the Settings for type 2 compound call
holders from the default of Full Call in TX3 to Full Call in TX1. -
9.Most of the /R problem could be eliminated by making the /R a Type 1 suffix
in the software so the /R is only used in TX1 and TX6 which should be
sufficient since in contest mode it normally skips over TX2 anyway (unless of
course you double click TX1 and make the program shortcut right to TX2 which
would not have the /R appended – nothing is perfect sigh) . I think we
should petition the developers to make this change. You’d have to be sharp
enough to catch the /R in any case (but you should be OPERATING anyway, not in
drone mode like so many seem to be). -
10.My pet peeve is that once stations go to FT8 they don’t bother to tune 2M or
6M analog for CQs or CQ there anymore. Unlike Marshall who has much less
activity on 2M and above in his part of the country I see lots of locals with
2, 3 or more bands CQ all day on 6M FT8 and its difficult to pry them away from
their computer screens to QSY to 2M and work some real radio. FT8 on 6M seems
as addictive as crack. My 2M and up totals really suffered from this behavior.
The ARRL thumping the drum about the wonders of FT8 in a VHF contest without
going into the problems we all saw (see the latest contest newsletter) isn’t
helping much either. -
11.There are ways to get stations to QSY to 2M in the 13 character TX5 free
message but it’s hard and takes up a lot of time. I tried a few different
ones: -a. Just sending QSY 2M? or even WB#xxx QSY 2M (exactly 13 – spaces
count) resulted in fail open most of the time or at best a free message back
that said “Where?” or “Freq?” and took a lot of time. Am I wrong or do we have
a CALL frequency on 2M where you can CALL another station? Seemed obvious to
me but …-
b. Sending QSY 144xxx was also inefficient and wasted time while it was
processed (who, me?). I also kept hoping that maybe multiple locals would see
it and try to make a few more Qs too, but I guess it never occurred to them to
try. -
c. Sending WB#nnn 144210 (also 13) worked the best since the other guy sees his
call in RED in the windows, knows it’s for him, knows where and can respond yea
or nay – best response being K2DRH QSY or K2DRH 2M or even K2DRH NO 2M since
it directs it at me. Still takes a while though. -
12. On ON4KST the 205 Group in the mornings we have been very successful using
FT8 on 2M 144.174 for 300-500 mile and even longer contacts. Sometime there
are several stations on at once. I saw none of this going on during the
contest. This has some real potential. -
Well I guess that’s my 12 step program for FT8 operating. Your mileage may
vary. -73 de Bob K2DRH
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