Icom IC-551D (IC 551 D IC551D) transceiver mods reviews software and diagrams

   
 
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28 March 2024, 10:18 UTC 


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Icom IC-551D (IC 551 D IC551D)
IC-551D
Programming interface schematics for Icom:
Programming software for Icom IC-551D (IC 551 D IC551D) :
PDF User Manual for Icom IC-551D (IC 551 D IC551D) :
PDF Service Manual with schematics for Icom IC-551D (IC 551 D IC551D) :

Mods for Icom IC-551D (IC 551 D IC551D) :
    Icom IC-551D (IC 551 D IC551D) Frequency Alignment
    Icom IC-551D (IC 551 D IC551D) EX-107 VOX UNIT -- Installation
    Icom IC-551D (IC 551 D IC551D) EX-108 P.B. TUNE UNIT -- Installation
    Icom IC-551D (IC 551 D IC551D) to rx down to 47.000 MHz
    Icom IC-551D (IC 551 D IC551D) Modification af the ScanRate and ScanSpeed

Icom IC-551D (IC 551 D IC551D) technical specifications :  Icom IC-551D (IC 551 D IC551D) technical specifications



Icom IC-551D (IC 551 D IC551D) Frequency Alignmen

  1. Locate R122 near center of main board, directly in front of center mounting screw. The top of this resistor is bare and is used as the test point for the BFO. Connect frequency counter to this point.

  2. Set mode switch to LSB. (Dial frequency unimportant)

  3. Adjust C105 for 9.013000 MHz.

  4. Set mode switch to CW.

  5. Turn on RF power control and set at minimum power output.

  6. Set receive/transmit switch to transmit.

  7. Short CW key jack on rear of radio or close CW key if attached.

  8. Adjust L33 for 9.010500 MHz.

  9. Return to receive.

  10. Set mode switch to USB.

  11. Adjust L32 for 9.010000 MHz.

  12. Set mode switch to CW.

  13. Adjust L31 for 9.009700 MHz.

  14. Remove cover from PLL unit.
    (6 x 17 cm. metal cover on right of main board.)

  15. Locate R44 near rear of PLL unit. The top of this resistor is bare and is used as the test point for the VCO. Connect frequency counter to this point.

  16. Set mode switch to LSB.

  17. Tune dial to 50.101.5 MHz.

  18. Adjust R59 for 41.088500 MHz.

  19. Tune dial to 50.101.4 MHz.

  20. Adjust R60 for 41.008400 Mhz.

    The following steps apply only to units equipped with FM unit EX106.

  21. Dial 50.100.0 MHz.

  22. Adjust L8 in FM unit for 50.100000 MHz on transmit at output to dummy load.


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