[Milsurplus] 1966 USN receiver project - National

[Nick England]

REMOTELY TUNED AUTOMATICALLY CONTROLLED HF COMMUNICATIONS RADIO RECEIVING
SET - National Co. January 1966 report
*Abstract : *The progress report covers the preliminary work accomplished
on a remotely tuned HF communications receiver specifically designed for
use in the Navy Southern Cross advanced communications program. The
equipment to be supplied under this program consists of several modules.
The first of these is a remotely tuned receiver front end of superior
performance. This module contains RF preselection circuits using amplifiers
employing beam switching tubes in accordance with the contractor's
proposal; a specially controlled first mixer injection oscillator; several
signal mixers for the achievement of a final intermediate frequency of 1750
Kc; control circuits for remotely tuning the RF system; and the means for
achieving the dynamic range capability of the receiver front end via a low
noise first injection oscillator through oscillator drift cancellation. The
remaining three modules to be delivered under the present contract are
individual IF modules which will provide the intelligence bandpass
filtering and the bulk of receiver gain and AGC. Two of these will be used
to establish upper and lower sideband reception with nominal 3 Kc
bandpasses. The third module will be set up for full four-channel reception
with a nominal 12 Kc bandwidth. The individual RF and IF modules will be
constructed for interface compatibility with the mechanical construction
established by N.E.L. for the Southern Cross program.
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What is "Southern Cross"? All I know is here -
http://www.navy-radio.com/journal/so_cross-journal-1965.pdf

Nick England K4NYW
www.navy-radio.com