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October 1945 Radio-Craft
 [Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
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Gray Mfg. Radio Keyer TG-10-F Morse Code Practice Machine
Radio Keyer TG-10-F at Code Training Room of USAAF Station No.
238, at Cluntoe Airfield
Interestingly, when I searched for the Hallicrafters TG-10-F Radio Keyer, the
first thing that came up was an eBay offering for a Gray Manufacturing
Army Signal Corps "Keyer
TG-10-F" Morse Code Practice Machine. Evidently more than one manufacturer was
contracted to make the model. It looks like a tape record / playback machine, but
it feeds a reel of paper strips with dots and dashes followed by straight lines
forming letters and words. An optical reader encodes the audio signal for code practice
students - up to 300 at a time using the built-in amplifier. Morse code was a primary
mode of communication during World War II because the transmit and receive
equipment was simple and reliable, and could perform acceptable in the presence
of noise and weak signals. It also had the advantage of some level of privacy since
most people could not understand code, especially when sent at high data rates (words
per minute, WPM). The lower photo to the left shows two of the TG-10-F Radio Keyer
machines in the Code Training Room of United States Army Air Force Station No. 238,
at Cluntoe Airfield, Ardboe County,
Tyrone in Northern Ireland (compliments of the
WartimeNI.com
website).
Thanks to Lynn L. for letting me know about an online copy of the
TG-10-F
Technical Manual on the Archive.org website. He also
pointed out that there is a speed adjustment control on the machine (which I
missed).
Hallicrafters Radio Ad
 Just one of numerous government radio and
electronic items now available through the Hallicrafters Co., Chicago, agent for
Reconstruction Finance Corporation.
This is a Keyer TG-10-F, an automatic unit for providing code practice signals
from inked tape recordings. Excellent for group instruction, sufficient power to
operate up to 300 pairs of head phones. Can be adapted as amplifier of 10 to 15
watts output for use with crystal mike or phono pick up. Completely checked and
reconditioned by Hallicrafters engineers. Send coupon for further details and list
of other available items.
These Valuable Items Available Now or very soon. Write, wire, or phone for further
information
• head phones • test equipment • component parts •
marine transmitters and receivers • code practice equipment •
sound detecting equipment • vehicular operation police and command sets •
radio beacons and airborne landing equipment
Hallicrafters Radio
Hallicrafters Co., Agent of RFC Under Contract SIA-3-24
World's Largest Exclusive Manufacturers of Short Wave Radio Communications Equipment
Posted August 23, 2021
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