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Icom IC-551 (IC 551 IC551) EX-108 P.B. TUNE UNIT -- Installation
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The EX-108 mounts to the upper mounting plate as shown on page 29 of the manual.
- Attach the EX-108 to the upper mounting plate with 4 screws.
- Route cable behind front panel to top of main circuit board.
- Remove jumper cable connected between J2 and J3. Connect EX-108 cable to J3.
- If your radio has a choke coil (L44) next to J3, remove it.
- 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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