RX audio output from the TS-180S may be increased a total of 4.7 dB. This is an optional change which you can make at the owners request.
On the IF unit X48-1240-00 change components:
R206 2.2K change to 1 K ohn
R207 2.2K change to 4.7 K ohm
On the AF Gain Control, between pin 1 and 3;
C4 .047uF change to .027uF mylar
Please notate your service manual.