IC02AT.13

Modifications for IC02AT

1/ Purpose: for increased receive audio and improved response.

Solution: Remove C117. C117 is a .22 uf capacitor. It can be located by first
finding the 8 pin IC that is neart the middle of the "Main Unit". Looking
immediately above it (above pin 4)  untill you see 2 round polarized capacitors.
The one on the left is C117. It can be successfully removed by just bending it
back and forth untill the leads break. Be carefull to get the right one!

2/ Purpose: To increase the memory scan and search scan speed.

Solution: Install a 100k ohm resistor  across R413. To locate R413 Remove the
DTMF Board that is attatched to the inside front of the radio by removeing the 
two small screws. You will now have the logic unit exposed. IC401 (which is the 
postage stamp sized IC near the middle of the board) is easily visible. Locate
the bottom right corner of this device and continue down until you come to the
first micro chip resistor. This is R413. Carefully install a 1/8 Watt or smaller
100K ohm resist or across it.

This dramatically increases the scan speed but also raises the "BEEP" tone
frequency.

By: Tony Lelieveld VE3DWI and Kevin Bowles VE3IAO