In message , Buck
writes
On Thu, 17 Feb 2005 23:32:36 +0000, "M. J. Powell"
wrote:

U-boats used HF for reporting back to base in Lorrient, but MF for talk
among themselves in the Wolfpack. It was this that was DFed by the
shipborne CRT DF.


By 'this', I assume you mean MF?

Sorry for vagueness. Yes, they used the lower frequencies for short
ranges, probably because the LF didn't travel far. (But far enough for
the RN)

Mike