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) Improve voice synthesizer and side tone audio

Remove C214 (.47 uf capacitor) from the main board.
Install a .1 mf 16V barrier layer capacitor in series with a 2.2 K 1/8W resistor from the emitter of Q58 and the base of Q59 on the foil side of the board.

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