75A-2 Collins Receiver

A-Line
Description

The Collins Model 75A-2 Receiver was designed for the amateur bands in the frequency range of 1500 kc to 30 mc. The receiver provides facilities for the reception of CW, MCW, and AM PHONE reception. The receiver uses the double-conversion superheterodyne principle to obtain high image rejection. Stability is obtained by the use of quartz crystals.

History

Designed in 1950, along with Collins 75A-1 represented a new generation of amateur products following World War II, the Collins A-Line and was first with many new electrical and mechanical performance features covering the 160 through 10 meter amateur bands. The A-Line existed during the age of AM (and CW) operation, before being replaced by the S-Line in the late 50’s.

Technological Innovations

Direct reading dial with frequency readings accurate to within 1 KHz up to 21.8 MHz and 2 KHz from 26 to 30 MHz. Introduction of the highly stable permeability tuned oscillators (PTO) and narrow bandwidth mechanical filters which allowed to achieve high stability and avoid frequency drift.

Applications

Amateur radio AM, CM and MCW.

Manufacturer
Collins
Country of Origin
USA
Inventory Number
007
Incorporation to Collection
02/06/2018
Type
Receiver
Rights
TechRocket RM
Application
Amateur radio communications