Icom IC-275H (IC 275 H IC275H) transceiver mods reviews software and diagrams
   
 
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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) Prevent PLL unlock at high ambient temperature

  1. Change the following parts on the PLL board
                    Original       New
      Part      Value          Value

      C101      12 pf 50V CH   6 pf 50V CH
      R137                     35D 45 SN (ICOM P/N 915-04229)
      R133      22K            15K
      C191      3 pf 50V       6 pf 50V
  2. The thermister should be installed in series with R133. Unsolder one end of R133 and solder R137 in series with it.

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