TS440 RX Audio Mods

Here's some easy modifications to improve the rx audio fidelity of Kenwood TS-440's. All references below are to the IF board
component designations.
l Increase C60 to a .47uf or 1 uf. This will increase low frequency response on all modes.
l Decrease C51 to .01 uf. This will increase high frequency response on SSB/CW.
l Try removing R263 (tacked on the bottom of the board on my early production unit). This will lower in amplitude the audio
coming out of the detectors and improved the smoothness (a real technical term) of the audio, especially on AM signals.
GW1NGL W1NGL Kevin Roberts Ham Radio

Page last updated on 12/29/2011 by Kevin Roberts W1NGL a colection of Ham Radio and Electronic Information