LF: WSPR-X and WSPR-15 (FW from Joe Taylor K1JT)

[Markus Vester <markusvester@aol.com>]

http://uk.groups.yahoo.com/group/rsgb_lf_group/message/2337

 

Joe Taylor, K1JT

WSPR-X and WSPR-15

Wed Jan 16, 2013 8:23 pm

 

Some of you may be interested in trying WSPR-X, a new version of WSPR
that includes the slow mode WSPR-15. WSPR-15 uses 15-minute T/R
sequences, rather than the standard 2-minute sequences; at MF and LF it
is 9 dB more sensitive than WSPR-2, decoding signals as weak as -37 dB
in the standard 2500 Hz reference bandwidth. WSPR-15 is not recommended
for use at HF: the tone spacing is only 0.183 Hz, less than the Doppler
spreading typical of many HF paths. The main intended application for
WSPR-15 is for very difficult paths at 137 kHz and the new 472 kHz band.
It may be interesting to try on 160 meters, as well. Note that the
recommended WSPR-15 sub-band is a 25 Hz slice just above the 200-Hz
WSPR-2 sub-band, i.e., 1600-1625 Hz above the standard "dial Frequency".
This will be handled automatically if you set up WSPR-X in the normal way.

A brief online User's Guide for WSPR-X is posted at
http://www.physics.princeton.edu/pulsar/K1JT/WSPR-X_Users_Guide.pdf ,
and the Windows installation file is posted at
http://physics.princeton.edu/pulsar/K1JT/WSPRX_07r2948.exe .

At present, WSPR-X does not support I/Q audio (for use with direct
conversion receivers and transceivers) and does not do “band hopping”.
Otherwise most familiar WSPR features are present and working well.

For software enthusiasts: Unlike older versions of WSPR, the user
interface of WSPR-X is written in C++ and the Qt programming framework.
My expectation is that this shift will make for easier development and
program maintenance in the future. At present a click-to-install package
is available only for Windows. Source code for WSPR-X is available from
the open-source SVN repository at berlios.de. Anonymous checkout of the
full WSPR-X source code can be accomplished with the command

svn co svn://svn.berlios.de/wsjt/branches/wsprx

User comments, suggestions, and bug reports will be very welcome!

-- 73, Joe, K1JT

PS: if someone would like to re-post this message to
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