REMOTELY TUNED AUTOMATICALLY CONTROLLED HF COMMUNICATIONS RADIO RECEIVING SET.
Interim progress rept.
NATIONAL CO INC MELROSE MASS
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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 contractors 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. Author
- Radio Communications