Icom IC-575 (IC 575 IC575) transceiver mods reviews software and diagrams

   
 
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20 December 2014, 3:15 UTC 


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Icom IC-575 (IC 575 IC575)
IC-575
Programming interface schematics for Icom:
Programming software for Icom IC-575 (IC 575 IC575) :
PDF User Manual for Icom IC-575 (IC 575 IC575) :
PDF Service Manual with schematics for Icom IC-575 (IC 575 IC575) :

Mods for Icom IC-575 (IC 575 IC575) :
    Icom IC-575 (IC 575 IC575) General Coverage TX Modification
    Icom IC-575 (IC 575 IC575) Pass band Tuning Modification
    Icom IC-575 (IC 575 IC575) Power control modification
    Icom IC-575 (IC 575 IC575) Restoration of pass band tuning
    Icom IC-575 (IC 575 IC575) Splitting into RX- and TX paths
    Icom IC-575 (IC 575 IC575) Modification of cw pass band (BFO)
    Icom IC-575 (IC 575 IC575) Disabling of SBB squelch
    Icom IC-575 (IC 575 IC575) Very fast AGC
    Icom IC-575 (IC 575 IC575) SSB RF Gain
    Icom IC-575 (IC 575 IC575) Tuning speed
    Icom IC-575 (IC 575 IC575) Frequency range & CTCSS tones
    Icom IC-575 (IC 575 IC575) Freq. steps mod

Icom IC-575 (IC 575 IC575) technical specifications :  Icom IC-575 (IC 575 IC575) technical specifications

Icom IC-575 (IC 575 IC575) Restoration of pass band tuning

Problem:

ICOM has chosen to remove the PBT in the later models, and replace it with a "data level adjustment". This change removes the possibility to profit from the PBT in case of QRM or to use the PBT as a cheap CW-filter.

Furthermore the two extra IF-mixings is done with only a minimum of filtering, making the receiver very susceptible to spurious IF breakthrough. This is often heard as high-pitch tones or as a high IF noise level.

Solution:

The solution is to re-wire the "data level" potentiometer so that it adjusts the PBT VXO-oscillator, and to re-install FI3. FI3 is a 455kHz ceramic SSB filter and can be bought under the type number: MURATA CFJ 455 K6.

Implementation:
  • remove the capacitor (C61) fitted in place of FI3

  • solder in FI3

  • readjust R72 for proper IF gain

  • cut wire PBTV (pin 4, P1/J1, MAIN, yellow) about 5cm from the plug (P1)

  • cut wire AMO2 (pin 3, P2/J18, MAIN, red) close to the plug (P2)

  • cut wire AMO3 (pin 4, P2/J18, MAIN, metal baird) close to the plug (P2)

  • connect PBTV wire (the end not connected to the plug) with AMO2 wire (the end not connected to the plug)

  • connect AMO3 (the end not connected to the plug) to +8V e.g. by tapping (pin 1, J4, MAIN, brown).

  • connect the wire stubs on the plug (AMO2 & AMO3) together is you wish to use external modulation input for PACKET etc.

  • adjust the coil next to X2 (PBT VXO) for correct middle PBT setting


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