Icom IC-775DSP (IC 775 DSP IC775DSP) transceiver mods reviews software and diagrams

   
 
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28 March 2024, 17:53 UTC 


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Icom IC-775DSP (IC 775 DSP IC775DSP)
IC-775DSP
Programming interface schematics for Icom:
Programming software for Icom IC-775DSP (IC 775 DSP IC775DSP) :
PDF User Manual for Icom IC-775DSP (IC 775 DSP IC775DSP) :
PDF Adjusments Procedures Manual with schematics for Icom IC-775DSP (IC 775 DSP IC775DSP) :
Schematics for Icom IC-775DSP (IC 775 DSP IC775DSP) :

Mods for Icom IC-775DSP (IC 775 DSP IC775DSP) :
    Icom IC-775DSP (IC 775 DSP IC775DSP) Mic sensitivity
    Icom IC-775DSP (IC 775 DSP IC775DSP) Increase the sensitivity on MW-band 0.5-1.6MHz
    Icom IC-775DSP (IC 775 DSP IC775DSP) Out of Band Information
    Icom IC-775DSP (IC 775 DSP IC775DSP) New product information

Icom IC-775DSP (IC 775 DSP IC775DSP) technical specifications :  Icom IC-775DSP (IC 775 DSP IC775DSP) technical specifications



Icom IC-775DSP (IC 775 DSP IC775DSP) Increase the sensitivity on MW-band 0.5-1.6MHz

At the input at the bandpassfilter on RF-Unit for MW, 0.5 to 1.6MHz, a 10dB attenuator is located. This attenuator also is a current limiter for the diode D19.

By removing the attenuators three resistors and lead the diode current thru a inductor instead, the increased sensitivity is achieved. But important is to limit the current by changing the value on R119.

To do the mod:

  1. R116 is exchanged with an inductor of 1mH.

  2. R117 removed and shorted.

  3. R118 is removed.

  4. R119 is exchanged with 150 Ohm resistor.

All resistors are surface mount.

The result is that the sensitivity is increased in the 0.5 to 1.6 MHz range is changed from -103dBm to -112dBm at 12 dB SINAD, 70% AM.

My personal findings are that this do MW listening much more interesting and enjoyable and I have no problems with to strong signal distortion what so ever.



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