AM Section
* Necessary measurement equipment :
AM Signal Generator, Audio Signal Analyzer, Dummy Load, Oscilloscope, Digital Volt Meter (DVM)
(A) VT adjust
AM Signal Generator Setting
1. Adjust AM Frequency of RT-961 to
522KHz. (or 520KHz)
2. Connect (-) terminal of DVM with GND ( or chassis ) and connect (+) terminal
with Jumper
J3
( VT CHECK ) and mesaure voltage.
( Low Freq. VT)
3. Adjust VT to 1.1V with
T02
(AM-OSC Coil).
* In case of
USA version,
AM freq. range is
520KHz ~ 1710KHz.
So, adjust as below.
at 520KHz, VT = 1.1V ( Low Freq. VT)
(B) Output Level adjust
AM Signal Generator Setting
- Modulation :
30%
- Audio Frequency :
400Hz
- Output Level :
100dB
- Radio Frequency :
603KHz (or 600KHz )
RT-961 Setting
- AM Frequency :
603KHz/1404KHz/999KHz (or 600KHz/1400KHz/1000KHz)
1. Turn AM Signal Generator Modulation ON
2. Adjust RT-961 AM Freq. to
603KHz (or 600KHz)
and
measure output level with Audio Signal analyzer.
3. Adjust output level to maximum point with
T01
( AM-ANT ).
4. Adjust AM Signal Generator & RT-961 AM Frequency to
1404KHz (or 1400KHz)
and measure output level.
5. Adjust output level to maximum point with
TC01
(
White
Trimmer).
6. Repeat above 2.~ 5.
steps
2 ~ 3 times until adusting to best output level.
7. Adjust AM Signal Generator & RT-961 AM Frequency to
999KHz (or 1000KHz)
and measure output level.
8. Adjust level to maximum position with
T03
(AM-IFT).
(C) TUNED Level adjust
AM Signal Generator Setting
- Modulation :
30%
- Audio Frequency :
400Hz
- Radio Frequency :
999KHz (or 1000KHZ)
- Output Level :
84dB
RT-961 Setting
- AM Frequency :
999KHz (or 1000KHz)
1. Turn AM Signal Generator Modulation ON ( Make sure if Output level is
84dB
)
2. If 'TUNED' indicator does not turn on at higher than 80~86dB(Generator output),
Adjust
VR01
( AM-ADJ ) up to the moment where 'TUNED' indicator tunrs OFF & ON again
3. Confirm if 'TUNED' turns OFF when decreasing the output level of AM Signal Generator slowly from 84dB to 80dB.
4. Push RT-961
TUNE UP or DOWN
button
"long"
at AM Signal Generator Output Level 84dB and
start AUTO search
.
Confirm if search
stops
at AM Frequency 999KHz (or 1000KHz).
< Check with both of High Freq. -> 999KHz(or 1000KHz) search , Low Freq. -> 999KHz(or 1000KHz) search >
Summary of Contents for RT-961
Page 9: ...PCB Assembly Front PCB 016 E 1319A00 Main PCB 016 X 1320A01 04 ...
Page 10: ...PCB Assembly Tuner PCB 4002002300 Top Side View Tuner PCB 4002002300 Bottom View ...
Page 11: ...Wiring Diagram ...
Page 12: ...Schematic Diagram 1 ...
Page 13: ...Schematic Diagram 3 022 T 1065N01 ...
Page 14: ...Schematic Diagram 2 ...
