The SX-122 Page

by Josh Rovero, KK1D

Updated: March 26, 2008

The SX-122 and SX-122A were the last "serious" Hallicrafters general coverage receivers. Dual conversion on all bands (unlike some of the competition, which were double conversion on only the upper frequency ranges), 50 KHz IF strip with three bandwidths (5, 2.5 and 0.5 KHz), separate product and envelope detectors, true single signal SSB and CW reception. SX-122 production began in 1964 and ended in 1968.

References:

1. Hallicrafters Operating and Service Instructions, Four Band Communications Receiver Model SX-122.
2. "Communications Receivers, The Vacuum Tube Era 1932-1981", 3rd Edition, by Raymond S. Moore
3. "Shortwave Receivers Past & Present", 2nd Edition, by Fred Osterman
4. Contributors

SX-122 photo from the Hallicrafters Collectors Association.

Phil's Old Radios SX-122 page

Another front panel photo     A look inside the case

Front Panel    Back Panel    Block Diagram

50 KHz IF Equivalent Schematic

Chassis, Top    Chassis, Bottom

Schematic, RF through 2nd Mixer, 2888x2105 pixel GIF, 118K

Schematic, 2nd Mixer through Audio out,, 2204x2125 pixel GIF, 87K