Was trying to see if the haphazard fax reception that has happened to me and others bored enough to decode faxes was due to the sdr or to the pc or what, and used the Icom Pro2 to receive the fax, ruling out the sdr and/or usb connection as only audio was fed to the pc via a transformer isolated cable. I copied a few faxes, enough to feel confident that the sdr/usb connection may have been part of the synch issues, and became certain another aspect was revealed.
See this link for a pic of the results;
http://s000.tinyupload.com/index.php?file_id=32389565419432764128In the image we see the results from K500 and WCODE both decoding the same input. In the middle of the K500 fax session you see where I changed mode from fm greyscale to fm black and white and much cleaner results are noted. The only time you want greyscale demod is when you are decoding press fax with black and white pics, or decoding a satellite weather image. The main problem I was trying to resolve is displayed where the fm black and white takes over from the fm greyscale, K500 does not switch modes gracefully, and as you can see synch was lost and restarted elsewhere on the screen.
What this tells us is do not change anything while a desired fax is being decoded or you might cause the decoder to lose synch.
The very weak fax was copied on 17MHz band and was emitted from Pt Reyes California.