Hi all,
WSJT-X v1.6.1 now includes a "Band Hopping" capability for WSPR mode.
It's basically similar to that in the older, Python-based WSPR, but in
addition it allows different choices of active bands for four daily
periods: Sunrise Grayline, Day, Sunset Grayline, and Night.
You can set up the desired bands on the main window's "Tab 4". Here's
the setup I'm using at present:
Sunrise: 160 80 40 30 20
Day: 30 20 17 15
Sunset: 160 80 40 30 20
Night: 160 80 40 30 20
Tune: 80 60 40 30 17 12
Duration: 60
The first four lines list the bands selected for each of the four daily
periods.
The "Tune" entries list the bands that require a brief (2.5 s long)
tuneup transmission, so that an automatic ATU can retune a multi-band
antenna. The tuning signal will be emitted during the last few seconds
before the start of a WSPR sequence on one of the listed bands.
Band-switching is effected by using the standard WSJT-X rig-control
features. The program knows the standard WSPR frequencies on the bands
from 160 through 10 meters.
Depending on your station and antenna setup, band changes might require
other switching besides retuning your radio. To make this possible in an
automated way, whenever WSJT-X executes a successful band-change command
to a CAT-controlled radio in WSPR mode, it looks for a file named
"user_hardware.bat", "user_hardware.cmd", "user_hardware.exe", or
"user_hardware" in the same directory as wsjtx[.exe]. If one of these
files is found, WSJT-X tries to execute it, passing the band as a single
argument. For example,
user_hardware.cmd 40
for a switch to 40 meters. You will need to write your own program,
script, or batch file to do the necessary switching at your station. I
wrote a simple Python program for this purpose.
The band-hopping algorithm is as follows. Starting at the top of a UTC
hour, the "designated band" for each 2-minute WSPR interval goes through
a sequence as follows
Band (m) 160 80 60 40 30 20 17 15 12 10
--------------------------------------------------
UTC Minute 00 02 04 06 08 10 12 14 16 18
20 22 24 26 28 30 32 34 36 38
40 42 44 46 48 50 52 54 56 58
Thus, each band is visited 3 times per hour if all 10 bands are active.
If a designated band is not in the active list for the current time of
day, the program makes a random choice among the specified active bands.
Unless there is no other available choice, the same band will not be
selected for two consecutive WSPR sequences.
Since the setup for WSPR mode is rather different that that for JT65,
JT9, and JT4 I find it convenient to run WSPR mode with the command
wsjtx -r WSPR
The WSPR settings will then be kept separate from your normal WSJT-X
settings. Those remain available by starting the program in the usual
way, e.g.,
wsjtx
at the command prompt (or double-clicking on a WSJT-X screen icon).
For those interested, I posted two WSPR-mode screen shots at:
http://www.physics.princeton.edu/pulsar/K1JT/WSPR_Main_Window.png
http://www.physics.princeton.edu/pulsar/K1JT/WSPR_Wide_Graph.png
There are probably some new bugs in the program, and in various ways it
could use some cleaning up in both code and appearance. However, it
seems to be very usable now (as of revision 5414). Suggested
improvements will be very welcome!
-- 73, Joe, K1JT
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