REVISION
FOR
AUSTRALIAN MODEL OF TRC-448
Catalog Number: 21-9448
When servicing Australian model of TRC-448 (Catalog Number 21-9448), refer to the Service
Manual for TRC-448 (Catalog Number 21-1561) as well as the following revision:
Page 4
SPECI FICATION
GENERAL
Frequency Range: 26.965 to 27.405 should be 27.015 to 27.225 MHz.
Channel: 40 channels should be 18 channels.
Page 6
PRINCIPLES OF OPERATION
PLL CIRCUIT
3rd paragraph
2nd line: Q5 VCO frequency (34.7F;75 to 35.2075 MHz) should read 34.8175
to 35.0275 MHz.
3rd line: down-mix produces signals of 1.28 through 1.72 MHz should read 1.33
through 1.54 MHz.
4th line: "N" (128 through 172) should read N (133 through 154).
7th paragraph
2nd line: Q5 VCO frequency (;54.765 to 35.205) should read 34.815 to 35.025.
3rd line: down-mix produces 1.28 through 1.72 should read 1.33 through 1.54 MHz.
4th and 5th line: deriving the required 1.28 through 1.72 MHz should read 1.33
through 1.54 MHz.
8th paragraph
3rd and 4th line: Q4 VCO frequency (19.1625 to 19.6025 MHz) should read 19.2125
to 19.4225 MHz.
4th line: up-mix produces 34.7675 through 35.2075 MHz should read 34.8175
through 35.0275 MHz.
6th line: The 1.28 through 1.72 MHz should read 1.33 through 1.54 MHz.
7th line: deriving the required 1.28 through 1.72 MHz should read 1.33 through 1.54
MHz.
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