Icom IC-275H (IC 275 H IC275H) transceiver mods reviews software and diagrams

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Transceivers
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Icom IC-275H (IC 275 H IC275H)

IC-275H

Programming interface schematics for Icom:
Programming software for Icom IC-275H (IC 275 H IC275H) :
PDF User Manual for Icom IC-275H (IC 275 H IC275H) : Icom IC-275H Instruction Manual
PDF Service Manual with schematics for Icom IC-275H (IC 275 H IC275H) :

Mods for Icom IC-275H (IC 275 H IC275H) :
    Icom IC-275H (IC 275 H IC275H) reduced power splattering
    Icom IC-275H (IC 275 H IC275H) Splitting into RX- and TX paths
    Icom IC-275H (IC 275 H IC275H) Frequency range & CTCSS tones
    Icom IC-275H (IC 275 H IC275H) Power control modification
    Icom IC-275H (IC 275 H IC275H) Restoration of pass band tuning
    Icom IC-275H (IC 275 H IC275H) Modification of cw pass band (BFO)
    Icom IC-275H (IC 275 H IC275H) Disabling of SBB squelch
    Icom IC-275H (IC 275 H IC275H) Very fast AGC
    Icom IC-275H (IC 275 H IC275H) SSB RF Gain
    Icom IC-275H (IC 275 H IC275H) Tuning speed
    Icom IC-275H (IC 275 H IC275H) PSK Transmit Audio Modification
    Icom IC-275H (IC 275 H IC275H) Freq. steps mod
    Icom IC-275H (IC 275 H IC275H) Band Expand
    Icom IC-275H (IC 275 H IC275H) amplifier oscillates
    Icom IC-275H (IC 275 H IC275H) Prevent PLL unlock at high ambient temperature
    Icom IC-275H (IC 275 H IC275H) Improve voice synthesizer and side tone audio
    Icom IC-275H (IC 275 H IC275H) Prevention of PLL unlock at 174 MHz
    Icom IC-275H (IC 275 H IC275H) Improve the stability of the center meter
    Icom IC-275H (IC 275 H IC275H) Noise coming from speaker during transmit with audio turned up
    Icom IC-275H (IC 275 H IC275H) Eliminate possible spurious emission when thermal switch has turned on during TX

Icom IC-275H (IC 275 H IC275H) technical specifications : Icom IC-275H (IC 275 H IC275H) technical specifications

Icom IC-275H (IC 275 H IC275H) Eliminate possible spurious emission when thermal switch has turned on during TX

Procedure

Remove top and bottom covers.
Remove PA section from radio.
Remove shield from power amplifier.
Replace R7 (originally 10K 1/4W) resistor with a 1K 1/4 watt resistor (ICOM part number 915-01165).
Replace R8 (originally 10K 1/4W) resistor with a 1K 1/4 watt resistor (ICOM part number 915-01165).
Replace the shield on the PA section.
Replace the PA section in the radio.
Replace the top and bottom covers.

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