Icom IC-551 (IC 551 IC551) transceiver mods reviews software and diagrams

   
 
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21 April 2021, 13:46 UTC 


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Icom IC-551 (IC 551 IC551)
IC-551
Programming interface schematics for Icom:
Programming software for Icom IC-551 (IC 551 IC551) :
PDF User Manual for Icom IC-551 (IC 551 IC551) :
PDF Service Manual with schematics for Icom IC-551 (IC 551 IC551) :

Mods for Icom IC-551 (IC 551 IC551) :
    Icom IC-551 (IC 551 IC551) Frequency Alignment
    Icom IC-551 (IC 551 IC551) EX-107 VOX UNIT -- Installation
    Icom IC-551 (IC 551 IC551) EX-108 P.B. TUNE UNIT -- Installation

Icom IC-551 (IC 551 IC551) technical specifications :  Icom IC-551 (IC 551 IC551) technical specifications



Icom IC-551 (IC 551 IC551) EX-108 P.B. TUNE UNIT -- Installation

The EX-108 mounts to the upper mounting plate as shown on page 29 of the manual.
  1. Attach the EX-108 to the upper mounting plate with 4 screws.

  2. Route cable behind front panel to top of main circuit board.

  3. Remove jumper cable connected between J2 and J3. Connect EX-108 cable to J3.

  4. If your radio has a choke coil (L44) next to J3, remove it.

  5. The cutoff bandwidth is about 700 Hz at -6db point.
    For CW, unit gives +/-500 Hz BW at -6db point and is adjustable. This unit also contains a speech processor for SSB use.

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