The Southwestern Historical Quarterly, Volume 97, July 1993 - April, 1994 Page: 66
754 p. : ill. (some col.), maps, ports. ; 23 cm.View a full description of this periodical.
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Southwestern Historical Quarterly
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The TR-1 Regency radio circuit. Courtesy PaulD. Davis.
radio circuit is divided into four sections. The first section consists of a
circuit to tune in the desired station RF signal frequency. This section al-
so contains an oscillator (called a local oscillator, or LO) to generate a
second signal, which is added to the first RF signal in a mixer to convert
the RF frequency to a lower RF frequency, called an intermediate fre-
quency (IF). The second section is the IF amplifier, followed by a third
section which detects or removes the audio frequencies riding "piggy-
back" on top of the RF frequency. The final section is the audio amplifi-
er, which builds up the audio signal enough to drive a loudspeaker.
Roger agreed to take on the toughest assignment, the design of the IF
amplifier-toughest because it required a circuit which would amplify
radio frequency (RF) electrical signals by a factor of many thousands.
Not only would new transistors capable of handling such high frequen-
cies have to be used for the first time in an easily reproducible circuit,
but all related circuits and components would have to be designed
"from scratch." These circuits would not only require unique perfor-
mance characteristics, but, to assure that the radio would be pocket-
sized, they also had to be subminiature in size, one-fourth to one-tenth
the size of even the smallest equivalent vacuum tube circuit compo-
nents.
Ed took on the tasks of designing the output stages and audio fre-
quency amplifier and providing direct assistance to and coordinating
with the semiconductor scientists who were designing and fabricating
the special new transistors which would be needed. Mark Campbell and
I agreed to work on the design of the input and mixer circuits. It was al-
so my job to coordinate the efforts of the group and locate and procure
those special components which we weren't forced to fabricate our-
selves, as well as seek help from other departments of TI as needed.
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 97, July 1993 - April, 1994, periodical, 1994; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth117154/m1/94/: accessed May 7, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas State Historical Association.