[Lowfer] WOLF!

[John Andrews]

As no year should ever go by without someone running WOLF at LF, my 2016 
contribution will be made tonight. WD2XES will run WOLF(10) on 137.350 
kHz, starting at 2000Z. The setup is rigged to start at the top of each 
hour, and run for 30 minutes. The second half of the hour will be used 
for receiving, and for tuning network cool-down!

For those who are new to the subject, WOLF is a BPSK mode, 10 bits per 
second in this case. It sends a highly error-corrected 15 character 
message over and over, repeating every 96 seconds. The text of the 
message is under the xmit operator's control. If you join the half hour 
in progress, you still probably decode the signal. The point of the 
repetition is to "build up" the copy over a long period of time, 
allowing weak signal reception on the order of QRSS60 detection limits.

WOLF GUI software is available at:
http://www.qsl.net/d/dl4yhf/wolf/index.html

Do NOT dredge up the earlier command-line version on Stewart Nelson's 
site unless you are a real glutton for punishment.

For casual use with a "big" signal, you may just be able to run the 
program without any frequency or sampling rate corrections. But nailing 
down your actual sampling rate will significantly improve your luck with 
weak signals. Your receiver calibration should be within 1 Hz for best 
results. Due to some changes at this end, the WD2XES frequency is about 
5 milliHertz high, due to DDS synthesizer round-off. The old exciter was 
more accurate, but is now enjoying a well-deserved retirement.

I'd be happy to answer any questions, and of course to get reception 
reports. Have fun.

John, W1TAG/WD2XES