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

   
 
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28 April 2024, 16:52 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) Disabling of SBB squelch

Problem:

Squelching is nice to have in FM mode, but it doesn't really work for SSB, where you will be looking for weak signals. Therefore you have to adjust the squelch level every time you change mode. Furthermore I enjoy using FM as a monitoring mode on the SSB calling frequency, so changing the mode happens quite often.


Solution:

The solution is quite simple. Just cut the connection to the SSB input of the squelch circuit in some way.


Implementation:

The easiest way to break the connection is to connect the base of Q7 to ground. The base is the lead facing into the centre of the PCB.