Hi all, Cool Edit can be used to generate white noise and mix it with your test signal at a desired S/N. Or you can record "real" noise off the air and mix it in desired ratio with signal. And it can
Hi Mal and all, While it would be great if we all had linear amplifiers, I believe that most modes of interest can be accommodated with a switching amp. Of course, CW, RTTY, and all forms of FM and F
Hi Bill, Lyle, and all, I have been looking at this signal to see how it might be received if it were 20 dB weaker (please don't laugh). IMO, coherent detection would be a big step toward that goal,
Hi Bill and all, Thanks for the CRUNCHed file. I took a close look at it, to see how well a machine might decode it. First, I found the spectral peak at about 799.875 Hz. This is amazing Tx and Rx fr
Hi Bill and all, If you have not yet opened today's message from William Staples, don't - it has the VBS.KakWorm virus attached. If you have already opened it and didn't get an error message, you may
I believe that, by using a signal format designed specifically for LF weak-signal operation, it should be possible to communicate at S/N values at least 10 dB below what is typically needed for QRSS.
Hi Uwe and all, The present implementation of WOLF, unfortunately, has very poor dynamic range. The BPSK signal must be between -20 dB and -50 dB, relative to full scale. If you are receiving your ow
Hi Andy and all, In my implementation, the code which uses pnpat is intertwined with modulation, etc., so I didn't include it. Sorry. The output of enccnv is an array 480 long, as is pnpat. You trans
Hi Andy and all, Sorry that I don't have a good document on the format, but here is the code used to generate it; I hope that it is enough info for you to build something compatible with WOLF. You ca
Hi Mike and all, Bill de Carle VE2IQ has added WOLF mode to his KEYER package. Can upload to keyer or provide data for an EPROM, etc. Download from Bill's web page at http://cafe.rapidus.net/bill1/bb
Hi Rik and all, I think that this bug has been fixed, but I failed to post to the LF group. My apologies. If 0.52 doesn't fix the problem for you, please tell me what program you are using to record,
Hi Markus and all, I'm quite interested in this idea; perhaps we can work together to develop the code. We might call it the LAMP (Loran Analysis for Monitoring Propagation), but other suggestions ar
Hi Mike, If you're still having trouble with Jim's WOLF signal, please email me a one minute .wav file, and I try to diagnose the problem. You can convert it to 8-bit samples to save some space, if y
Hi Peter, I don't have Win98 myself, but several users have run WOLF under Win98 with no trouble. Please send me the failing console output, or tell me what OS error message you are getting, and I'll
Hi Steve and all, FDK is only similar to BPSK in terms of a possible way it can be generated. Its spectrum over a 60 second epoch (the initial character duration for now) looks identical to a two ton
Hi all, Thanks for the interesting posts on frequency errors in sound cards and drivers. It appears that WOLF should use 11025 Hz, rather than 8000 Hz, as its standard sample rate. Upsampling or down
Hi Rik and all, The real loss is indeed worse than 0.8 dB, but is extremely unlikely to come anywhere near 3 dB. That's because the message data is interleaved with a pseudo-random stream which is kn
Hi Steve and all, Sorry that some statements on my WOLF page might be misleading. Speaking about "multitone FSK", I meant COFDM (coded orthogonal frequency division multiplexing), and similar systems
Hi Markus and all, Thanks for your post. I've fixed some of the minor problems, and have comments on the major ones. WOLF new version is 0.53, which can be downloaded at http://www.scgroup.com/ham/wo
