Very Early Yaesu Musen Co. Amateur Radio Equipment in Australia

Shown below are Block Diagrams of the FT-100B and the FTDX100, 5 band SSB/CW/AM mainly solid state transceivers.

FT-100B Block Diagram
Note that the block diagrams of the FT-100B and the FTDX100 are almost identical. Both germanium and silicon transistors were used in almost equal quantities, unlike the original FT-100 which used nearly all germanium devices, and the later FT-101 which used nearly all silicon devices.

By the time Yaesu released the FT-100B they had refined their solid state transceiver design considerably, having used the model's FT-100 Mark 1 and 2 to iron out problem areas. Being at the forefront of technology when it was first released, the original Mark 1 FT-100 did have a few teething problems, to the extent that Bail's published their own three page Trouble Shooting Guide for it.

FTDX100 Block Diagram


Fred & Jim Bail Shown at left are
Fred Bail,
and Jim Bail,

At right are depicted
various Bail logos.

Bail Radio & TV Service Logo
Bail Electronic Services Logo, early version
Bail Electronics Services Logo, late version

Fred Bail passed away in the late 1970's, Jim Bail passed away in the early 1980's. Following Fred's passing their company was sold to Stan Roberts of Teletramel, who continued to run Bail Electronic Services into the early 1990's from the Victorian country town of Wangaratta.

The author would be happy to hear from anybody who has very early Yaesu equipment, such as FL-20 Mark's 1 and 2, or FL-100B Mark's 1 and 2. By way of some background information on the author, Greg Whiter was employed by Bail Electronic Services (see 1974 staff photo) from the late 1960's through to 1977. Following this period he formed the company GFS Electronic Imports, of which he is still a director today.

Any comments on this web site should be directed to the author, Greg Whiter at :

Next Page - FT-100 Trouble Shooting Guide
Other Pages at this site, include: FL-100B, the first Australian Yaesu radio, F-Line of the mid 1960's,  FL-10/40 Details, FL-20 Circuit and photos, BES 1974 Staff Photo, Yaesu/VK3YS/VK3ABA QSL Cards, FL-50 Magazine Review and photos, Photo and details of Yaesu's first SSB Transceiver, the 1966 released solid state FT-100, FT-100 Trouble Shooting Guide is shown HERE, the 1968 released FTdx400, The Yaesu Museum (German Site)

Other web articles by the same author   The Chronological History of the Development of Radio
Origins Of The Handie Talkie
he History Of Clark Masts
The Early History of GFS Electronics


Copyright © Greg D. Whiter 2010 - All rights Reserved

This page was last updated 30/12/2009

This page is sponsored by GFS Electronics, Australian distributors of Clark Masts portable air-operated masting, Cobham Mastsystem lightweight portable carbon fibre masts and Debeglass non-conductive guy/catenary wire.