The Yaesu FT-77 is a transceiver to be used in the 3,5 – 29,9 MHz shortwave radio amateur segment.
Intended to offer only the most essential operating features the FT-77 was released in 1982 by the Japanese Yaesu Musen Corporation for appx $250 as an economic and compact rig very suitable for mobile use.
Incoming rx signals are fed to one of 5 Low Pass filters and continues to the RF unit.
The receiver front end uses Schottky barrier diodes which results in good performance in the presence of strong signals.
A variable 5-100W transmitter output is being generated by a combination of protected 2SC1589 (predriver), 2SD235Y (bias), 2SC2395 (driver) and 2SC2290 (final) transistors.