
Chapter
4
Radio Tuning Procedure
4-1. General
Following service, three calibrations are required:
•
Transmitter calibration
•
Power calibration
•
Oscillator calibration.
An IBM PC (personal computer) and RSS (Radio Service Software) package, G424 (FVN4841), are
required to align the radio. Refer to the RSS manual, publication number 6886867J01, for software
installation and setup procedures.
4-2. Transmitter Calibration
1. Rotate fully clockwise potentiometers R299 (driver bias) and R298 (output bias), on the High-
Power board.
2. Ensure that the High-Power board heatsink temperature is 25
±
5
°
C and that no audio input is
present.
3. Measure Q34 or Q35 transistors base voltage. Adjust R298 until the measured base voltage is
0.63
±
0.01V.
4. Measure Q31 or Q32 drivers base voltage. Adjust R299 until the measured base voltage is
0.76
±
0.01V.
4-3. Power Calibration
Perform the power calibration according to the power calibration procedure in the RSS manual.
4-4. Oscillator Calibration
Perform the oscillator calibration according to the calibration procedure in the RSS manual.
Cat. No. 6886859J01
4-1
Содержание M90AMNOKV5-K
Страница 1: ......
Страница 4: ......
Страница 30: ...Intentionally Left Blank 2 6 Cat No 6886859J01 ...
Страница 36: ...Intentionally Left Blank 3 6 Cat No 6886859J01 ...
Страница 38: ...Intentionally Left Blank 4 2 Cat No 6886859J01 ...
Страница 42: ...Intentionally Left Blank 5 4 Cat No 6886859J01 ...
Страница 50: ...Figure 5 11 Test Points Map Cat No 6886859J01 5 13 ...
Страница 55: ...Intentionally Left Blank 5 18 Cat No 6886859J01 ...
Страница 61: ...Intentionally Left Blank 6 6 Cat No 6886859J01 ...
Страница 63: ......
Страница 74: ......
Страница 75: ......
Страница 118: ...Intentionally Left Blank 7 56 Cat No 6886859J01 ...
Страница 144: ......
Страница 173: ...Intentionally Left Blank Cat No 6886859J01 7 111 ...
Страница 175: ...MICOM 3F Exploded View Cat No 6886859J01 7 113 ...
Страница 177: ...MICOM 3T Exploded View Cat No 6886859J01 7 115 ...
Страница 179: ...MICOM 3R Exploded View Cat No 6886859J01 7 117 ...
Страница 181: ...Control Head Assembly Exploded View Cat No 6886859J01 7 119 ...