Model No: M150 Plus
Customer: INTEK Rev No: A
9
7.
Set RF S.S.G Freq.: 10.695MHz
，
Mod.: 60%
，
Fmod.: 1KHz, Output level:1mV.
8.
Squelch Volume set to minimum position, volume control set to around middle position.
9.
Adjust IFT L5 for maximum audio output and minimum distortion at the distortion meter. ( distortion less than 5%).
10.
Set volume control to maximum position, audio output power shall be more than 3 Watts.
4.2.2 Sensitivity Adjust:
1. RX RF bandwidth alignment: Apply Spectrum analyzer’s Track Gen. Output connect to the UUT antenna terminal and
input connect to the UUT TP3 (Q26 Emitter), center frequency set 27MHz, span set 30MHz, adjust IFT L4, L21 & L22
refer to attached table curve, then short TP3 & TP4.
2. UUT set to FM mode CH22
，
output of RF signal generator connect to
TP5 (Antenna)
.
3. Set RF S.S.G Freq.: 27.225MHz
，
Mod.:
±
1.2KHz
，
Fmod.: 1KHz, Output level:0.5uV.
4.
Adjust the volume control for 2V output on distortion meter read.
5.
Adjust L2 & L3 for more than 12dB at SINAD meter.
6.
Repeat as needed. Check all channels sensitivity must met the D.T.S. specifications.
7. UUT set to AM mode CH22
，
output of RF signal generator connect to
TP5 (Antenna)
.
8. Set RF S.S.G Freq.: 27.185MHz
，
Mod.: 60%
，
Fmod.: 1KHz, Output level:0.5uV.
9.
Adjust the volume control for 2V output on distortion meter read.
10.
Adjust L2 & L3 for more than 12dB at SINAD meter.
11.
Repeat as needed. Check all channels sensitivity must met the D.T.S. specifications.
4.2.3 T- Squelch Sensitivity Adjust:
1.
UUT set to AM CH22
，
output of RF signal generator to the antenna input terminal.
2.
Set RF S.S.G Freq.: 27.225MHz
，
Mod.: 60%
，
Fmod.: 1KHz, Output level: -47dBm.
3.
Volume control and Squelch control set to maximum position
，
(Full C.W)
4.
Adjust the
RV5
to mute the speaker, then turn the RF S.S.G. output level to –47dBm.
5.
Slowly turn
RV5
to a position that the audio output on the speaker just appears from no output. Turn the RF S.S.G.
output level to -57dBm, the audio must be off from the speaker.
Auto Squelch Adjust:
6.
UUT set to AM CH22
，
output of RF signal generator to the antenna input terminal.
7.
Set RF S.S.G Freq.: 27.225MHz
，
Mod.: 60%
，
Fmod.: 1KHz, Output level: -104dBm.
8.
Squelch volume control set to minimum and Off position (Full C.C.W).
9.
Adjust the
RV7
to mute the speaker, Slowly turn
RV7
to a position that the audio output on the speaker just appears
from no output. Turn the RF S.S.G. output level to -107dBm, the audio must be off from the speaker.
4.2.4 RX Signal Meter Display Adjust: (For M-760 Only)
1.
UUT set to AM CH22
，
output of RF signal generator to antenna input terminal. RF Gain volume at maximum. Power
switch turn on.
