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DL7MAJ, Oct 20
th
2015
Page 8 (21)
FM-IF
Alignment of FM-Unit can only be done outside the transceiver.
Use pins to connect supply (9V), Gnd, signals and meters acc. to the picture.
IMPORTANT:
An external trimmer R1 (10kOhm) has also to be connected, otherwise Q1 wouldn´t
operate.
1)
Connect counter to TP2 (high impedance); frequency should be 10,/-1kHz
Use analog scope, probe 10:1, with Y-output to connect the counter if available
2)
Connect IF-Signal 10,700MHz, 1mV, unmodulated to pin 3 and 4(Gnd)
3)
Connect DC-voltmeter to pin 10
4)
Adjust L1 and L2 for max. negative AGC-voltage at pin 10; reduce amplitude of IF-
signalgenerator as far as possible to find the point of best sensitivity; try variation of
R1
5)
FM-modulate IF-signal with sinus 1kHz and 5kHz deviation
6)
Connect scope to pin 9, AF audio
7)
Connect DC-voltmeter to pin 6, center meter
8)
Adjust L3 and L4 for best demodulation (scope) and 0V at center meter
9)
Reinstall FM-Unit into the transceiver
10)
Mode “FM”, “RX”
11)
Tune in signal 50Mikrovolt 145,000MHz: Set R1 (mainboard nearby the FM-Unit) for
S=9
Summary of Contents for IC-201
Page 4: ...DL7MAJ Oct 20th 2015 Page 4 21 ...
Page 7: ...DL7MAJ Oct 20th 2015 Page 7 21 ...
Page 9: ...DL7MAJ Oct 20th 2015 Page 9 21 ...
Page 12: ...DL7MAJ Oct 20th 2015 Page 12 21 ...
Page 13: ...DL7MAJ Oct 20th 2015 Page 13 21 Remove plug connect A meter ...
Page 15: ...DL7MAJ Oct 20th 2015 Page 15 21 De Installation of the VFO Sequence ...
Page 16: ...DL7MAJ Oct 20th 2015 Page 16 21 ...
Page 17: ...DL7MAJ Oct 20th 2015 Page 17 21 ...
Page 18: ...DL7MAJ Oct 20th 2015 Page 18 21 ...
Page 19: ...DL7MAJ Oct 20th 2015 Page 19 21 ...