http://radiolocation.tripod.com/Transverter/Transverter.html Mike WE0H Andy - KU4XR wrote: > I don't remember where I read it on the Internet, but there is a > site that tells about modifying a SSB CB radio to LF frequencies > to use for underground / cave communications. > > > > Andy - KU4XR - EM75xr - Friendsville, TN. USA