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DL7MAJ, Oct 20

th

2015

Page 21 (21)

If you want to contact the author:

Stefan Steger, DL7MAJ, eMail:

[email protected]

Homepage:

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Summary of Contents for IC-201

Page 1: ...s procedure is reengineered by myself and may be not in accordance with the original procedure from the manufacturer So I can t accept any claims from anybody in case of injuries problems damages and losses Usage of this procedure is at own risk Of course you may ask me or give hints for improvement ...

Page 2: ...hat VOX doesn t trip search for the point where VOX trips without Modulation and set R50 shortly before this point 5 Check that for all modes FM USB LSB CW VOX doesn t trip without modulation 6 CAL switched on connect counter to CP1 Best use analog scope with Y output 7 Wait 1 minute 8 Adjust frequency to 2 500000 MHz ...

Page 3: ...z 10 Note At FM and receive R there is no output of BFO 11 Mode USB Set R41 for just a little bit above S 0 S Meter just moves on S Meter 12 Tune in weak signal at 145 000MHz just enough to move S Meter to S 5 13 Tune L1 L6 L8 L9 L10 for maximum 14 Tune in signal 50Mikrovolt 145 000MHz Set R40 for S 9 15 Remove steps 11 and 14 if necessary 16 Mode FM 17 Adjust R1 on Main board near FM Unit to S 9 ...

Page 4: ...DL7MAJ Oct 20th 2015 Page 4 21 ...

Page 5: ... Module two clamps at each end 4 Tune in to L7 for maximum L2 to L5 are only accessible from bottom 5 Mount RF Module 6 If a big increase of sensitivity has been achieved then repeat adjustment of S Meter Look for GIF step 14 Note The resistor at the drain of Q1 18Ohm is a modification for damping oscillations in case of badly matches antennas ...

Page 6: ...375 MHz X2 16 Coarse 145 MHz Adjust C5 to exactly 15 364375 MHz X1 17 Coarse 145 MHz DUPLX Switch to T and adjust C70 to exactly 15 289375 MHz X3 18 Check 145 MHz in DUPLEX is on RX same as in 15 15 364375 MHz 19 Recheck 15 16 and 17 in R and T 20 Connect AF signal 2kHz 10mVpp to MIC Input 21 Connect Scope to Pin 9 of IC1 MC3301P 22 Mode FM Transmit T 23 Adjust R52 for symmetrical clipping at Pin ...

Page 7: ...DL7MAJ Oct 20th 2015 Page 7 21 ...

Page 8: ... 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 ce...

Page 9: ...DL7MAJ Oct 20th 2015 Page 9 21 ...

Page 10: ...8 TX 9 Set sweeper output to app 1W at antenna output 10 Tune L1 to maximum 11 Tune L3 to L9 to maximum and flat response in the range of 10 385 to 12 385MHz 12 Reduce sweeper output when 1W at antenna output is exceeded 13 Tune C32 C35 C43 and C44 to maximum and flat response in the range of 10 385 to 12 385MHz 14 Go back to 10 until result is satisfying Flat response 3dB in the range of 10 385 t...

Page 11: ...in 2 3 of J11 measures current of Q1 7 TX 8 Adjust R3 for app 30 to 40mA 9 RX 10 Connect A meter between pin 1 4 of J11 measures current of Q2 11 TX 12 Adjust R8 for app 80 to 90mA 13 RX 14 Mode FM and TX 15 Adjust C11 C12 C22 C23 for maximum output should be 10W 16 Maybe TX limiter R13 limits the output then adjust R13 for 10W and go back to 15 17 Adjust R12 for SWR 0 18 Connect resistor 25 20W t...

Page 12: ...DL7MAJ Oct 20th 2015 Page 12 21 ...

Page 13: ...DL7MAJ Oct 20th 2015 Page 13 21 Remove plug connect A meter ...

Page 14: ...e of VFO with L1 to exactly 1000kHz use internal calibrator as reference 3 If you adjust L1 a realignment of the mechanical scale is necessary 4 Repeat 3 and 3 if necessary Be very careful Use plastic trimmers only otherwise destruction of L1 will result And you are a fool for the rest of you life ...

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 ...

Page 20: ...DL7MAJ Oct 20th 2015 Page 20 21 ...

Page 21: ...DL7MAJ Oct 20th 2015 Page 21 21 If you want to contact the author Stefan Steger DL7MAJ eMail dl7maj darc de Homepage www dl7maj de ...

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