Service Manual
SP - 1402
Page 19 of 35
PLL Alignment
TX VCO
a)
Select channel 1. (440.025MHz)
b)
Set the PTT switch to on. Check that the VCO tuning voltage at TP1 is 0.7~1.0V. (CV1)
c)
Set the PTT switch to off. Select Channel 8. (469.975MHz)
d)
Set the PTT switch to on and check that the voltage at TP1 is 4.0~4.5V.
e)
Set the PTT switch to off.
RX VCO
a)
Select channel 1. (440.025MHz)
b)
Check that the VCO tuning voltage at TP1 (Please see fig.3) is 0.7~1.0V. (CV901)
c)
Select channel 8. (469.975MHz)
d)
Check that the voltage at TP1 is 3.5~4.0V.
Transmitter Alignment
TCXO
a)
Select channel 1. (440.025MHz)
b)
Set the PTT switch to on.
c)
Using the frequency counter, adjust the TCXO (RV1), so that the transmit frequency is
/- 300Hz of the required frequency.
d)
Set the PTT switch to off.
If no further alignment is to be carried out, it may be necessary to reset the squelch.
Power
a)
Select channel 1. (440.025MHz)
b)
Set the PTT switch to on.
c)
Adjust the RV4 max(clockwise),RV5 to get Power 5W
Summary of Contents for SP-1102
Page 1: ...Service Manual SP 1402 Page 1 of 35 SP 1402 Service Manual...
Page 18: ...Service Manual SP 1402 Page 18 of 35 Alignment Alignment drawings required Fig 3...
Page 29: ...Service Manual SP 1402 Page 29 of 35 Schematics and PCB layout Index...
Page 30: ...Service Manual SP 1402 Page 30 of 35 Schematics and PCB layout Index...
Page 31: ...Service Manual SP 1402 Page 31 of 35 Schematics and PCB layout Index...
Page 32: ...Service Manual SP 1402 Page 32 of 35 Schematics and PCB layout Index...
Page 34: ...Service Manual SP 1402 Page 34 of 35 Parts List...