Thanks for all the additional advice, Gentlemen. I understand about audio levels, filtering, etc. :-)
My sound card (old Creative labs unit, IIRC) interface is just a couple of audio transformers removed from old 56k PCI telephone modems, with some pads and pots. I'll check out your interface PDF, Jim. If anyone runs into issues running WSPR for Windows on Linux (I did), try WSPR 4 for Linux from the svn repo. But if you have any questions about that, better ask now, while I can still remember what all I had to do this AM to get the Linux version running here in Xubuntu 14.04 LTS. I'll try and run WSPR in at least RX/upload spots mode on 160, whenever I can. 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://www.contesting.com/_topband
