wsprd - is a decoder for K1JT's Weak Signal Propagation Reporter (WSPR) mode.
wsprd - The program is written in C and is a command-line program that
reads from a .c2 file or .wav file and writes output to the console. It is
used by WSJT-X for wspr-mode decoding.
Path to writeable data files, default="."
Write .c2 file at the end of the first pass
x is transceiver dial frequency error in Hz
x is transceiver dial frequency in MHz
do not use, or update the hash table
decode wspr-15 .wav file
quick mode - does not dig deep for weak signals
single pass mode, no subtraction (same as original
verbose mode, shows duplicate decodings
wideband mode - decode signals within +/- 150 Hz of
x is fano metric table bias, default is 0.42
The Infile can be either .wav or .c2, for example:
./wsprd -wf 14.0956 140709_2258.wav
NOTE for .c2 files, the frequency within the file overrides
the command line value.
•By default, wsprd reports signals that are
within +/- 110 Hz of the subband center frequency. The wideband option (-w)
extends this to +/- 150 Hz.
•wsprd maintains a hashtable and will
decode all three types of wspr messages. An option (-H) is available to turn
off use of the hashtable.
•The symbols are decoded using Phil Karn’s
sequential decoder routine, fano.c
1.This program attempts to maximize the number of
successful decodes per transmit interval by trying to decode virtually every
peak in the averaged spectrum. The program also implements two-pass decoding,
whereby signals that are successfully decoded are subtracted one-by-one during
the first decoding pass. Then, the decoder is run again. In many cases the
subtraction process will uncover signals that can then be successfully decoded
on the second pass.
2.There will be occasional duplicate decodes when two
closely spaced peaks come from the same signal. The program removes dupes
based on callsign and frequency. Two decodes that have the same callsign and
estimated frequencies that are within 1 Hz will be treated as decodes of the
same signal. This dupechecking is turned off with the -v flag.
Joe Taylor, K1JT and Steven Franks, K9AN
WSPRD is Copyright © 2015 by Joseph H. Taylor, Jr., K1JT, and
Steven Franke, K9AN, with contributions from additional authors. WSPRD
is Open Source software, licensed under the GNU General Public License
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.