IC-2200H Mods
 

MOD for extended RX/TX range

RX receive circuitry can be modified to receive from 118 MHz to 174 MHz. This requires the removal of a surface mount diode D 11 from the Logic Board. It is the only non SMT-Diode of the Logic Board.

 

TX transmit circuitry can be modified to transmit from 136 MHz to 174 MHz. This requires the removal of a surface mount diode D 13 from the Logic Board. D 13 is near by D 11.
 

Click to view a larger area.

 

MOD Expand receive (EUR)

While pushing [MONI/ANM] and [LOW/DUP], turn the power on.
 

Now the radio receives in the range of 118 - 174 MHz. In the range of 118 - 135,975 MHz the radio receives automatically AM.

 

IC-2200H Mic Output Modification

Mod 1 of 2

The IC-2200H has minimal "sensitivity" to the point that it is hard to achieve enough audio in what is sometimes a quiet area, such as a home.

This modification electrically increases the output of the microphone element. The attached picture's NUMBERS in brackets () will further describe the steps. To complete this modification, you will need to disassemble the hand mic that came with your IC-2200H, and replace a surface-mounted resistor with a standard carbon resistor.

Mic gain modification

(Pix 1) Remove the original surface-mounted resistor

(Pix 2) Replace it with a 4.7 K resistor


This modification will result in a pleasing increase in sensitivity of the microphone. The new ratio of the replacement resistor will provide an increase of the mic element's audio level.

Mod 2 of 2

The IC-2200H has minimal "sensitivity" to the point that it is hard to achieve enough audio in what is sometimes a quiet area, such as a home.

This modification simply allows better access to the mic element.. The attached picture's NUMBERS in brackets () will further describe the steps. To complete this modification, you will need to disassemble the hand mic that came with your IC-2200H. This modification will result in a pleasing increase in sensitivity and audio quality of the microphone.

Mic access increase

(Pix 1) Drill out (enlarge) the hole as shown


(Pix 2) Remove the poppel-pad, and remove some of the restriction material. (This pix shows the removal of the soft rubber in-progress)


This modification will result in a pleasing increase in sensitivity of the microphone. The new ratio of the replacement resistor will provide an increase of the mic element's audio level.

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ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.