Modifying the IC2SAT for extended receive is very simple if a certain diode
was not installed at the factory, as was the case with my 2SAT.
Turn the radio off, simultaneously press [#],[B],[light] and turn it on. (The
button is not labeled, it is on the side under the wrist strap.)
Release those three buttons after the radio beeps. (I think that mine beeped.)
It can now receive over three large frequency ranges and will receive AM
aircraft band transmissions acceptably. Experiment to find which frequencies
you can get. The memory channel number will display the letter "U" to show
that the PLL circuit is unlocked on frequencies that cannot be received. It
will tune from 0-1300MHz but the operable ranges are not that big, its highest
receiving freq is a little over 300MHz.
If that doesn't work, a diode will have to be removed. It is a glass diode
mounted on the PTT switch circuit board, and I think it is the only standard
component in that area. It is mostly surface mount components.
Standard disclaimers apply, since I cannot be responsible for whatever you may
do if and when you must remove the front to look for a diode. (The owner's
manual explains how to open the 2SAT.)