On January 11, 2012 the National Security Agency (NSA) released under
a FOIA request a pre-1995 article entitled "Receiver Dynamics" from
its Classified internal magazine, Cryptologic Quarterly. It contains
a well-written explanation of the specifications of HF receivers used
by some of NSA's K4 divisions. Some SWLfest list members may even
recognize some of the receivers mentioned as their
own.
http://www.nsa.gov/public_info/_files/cryptologic_quarterly/Receiver_Dynamics.pdf
-Ed Cummings
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