Kirisun TM840 - Page 33

TM840 Service Manual
4.Modulate FM Deviation to: 4.6±0.08kHz
5.Click[OK] to save.
6．Low
Frequency modulation deviation
1.Enter the PC tuning mode
Double click[low frequency modulation deviation],click eight frequencies from F1 to F8 respectively;
3.When Freq is 0.1kHz, observe FM Deviation on integrated tester, modulate value on PC software.
4.Modulate FM Deviation to: 4.6±0.08kHz;
5.Click[OK] to save.
4.52kHz-4.68kHz
7．High
frequency modulation deviation
1.Enter the PC tuning mode
2.Double click[High frequency modulation deviation],click eight frequencies from F1 to F8 respectively;
3.When AF Freq is 6.0kHz, observe FM Deviation on Screen of integrated tester, modulate value on PC software.
4.Modulate FM deviation to 4.6±0.08kHz；
5）Click[OK] to save.
4.52kHz-4.68kHz
8．VOX 1
1.Enter the PC tuning mode2.Double click [VOX 1];
2.Click [START], and the value change around automatically on PC software
3.Click [STOP]
4.Click[OK] to save.
This function is not available, doesn’t need to
test
9．VOX 10
1.Enter the PC tuning mode
2.Double click [VOX 10]
3.Click [START], and the value change around automatically on PC software
4.Click [STOP]
5.Click [OK] to save
This function is not available, doesn’t need to
test
10．TX modulation sensitivity
1. Modulate the audio output range on integrated tester, set frequency deviation as W:3kHz（wideband）/N:1.5kHz（narrowband）；
2. The current value is modulation sensitivity (This value is used in the ‘modulation distortion’ and ‘SNR’).
15mV±10mV
11. Modulation distortion
Observe the values on distortion table. ＜3%
12. SNR(signal and noise ratio)
Observe the value of SNR.
1）W:＞45dB(wide band）;
2）N:＞40dB（narrow band）.
30