~ LA8OKA Martin ~

Mediumwave sensitivity improvement for ICOM IC-707.

This page was last updated 02.11.15 by Martin Storli.

The sensitivity below 1,6 MHz is greatly reduced on ICOM IC-707. The attenuation is accomplished with R105 and R108. Replacing R105 and R108 with a wire will restore the sensitivity below 1,6 MHz. Performing this modification may result in overloading problems below 1,6 MHz.

Before you do this, please make sure you understands the consequences this modification or failure of this modification can lead to:

Fig. 1: The front end of the ICOM IC-707 showing the signal path below 1,6 MHz.

The entire schematics for the ICOM IC-707 can be downloaded from

Good luck!

73 de LA8OKA Martin Storli