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Modifications for the Kenwood TS-440 - Radio mods
https://www.radiomods.co.nz/kenwood/kenwoodts440.html
TS-440 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. Increase C60 to a .47uf or 1 uf. This will increase low frequency response on all modes. Decrease C51 to .01 uf. This will increase high frequency response on SSB/CW.
TS440S Repair FAQ - OZ1BXM
http://www.oz1bxm.dk/TS440/TS440S_Repair_FAQ.pdf
I recently ran into some problems with my Kenwood TS-440S. Here is a list of my problems. 1. Garbled and Distorted RX audio like its “Under Water” 2. Intermitant operation. I would loose all display and all audio. (also the Dots on display problem is very similar) I also go through the procedure on how to check VCO 1 and VCO 5,
Circuit Improvements for the TS-440S - somis.org
http://www.somis.org/440.html
[use the 440's 20db ATTN as a standard] {Use 15db rolloff at zero-beat for more low-end audio, or 25db roll-off for more high-end audio and/or better unwanted sideband suppression} This completes the alignment of the carrier oscillators. >>> If you installed BOTH filters: on LSB tune the 440 above the calibrator's zerobeat frequency and note the 20db (or the roll-off db you used …
Kenwood TS-440 problems | QRZ Forums
https://forums.qrz.com/index.php?threads/kenwood-ts-440-problems.417192/
K3LFC Ham Member QRZ Page. Kenwood. KF6DWI said: ↑. Hello everyone, I have a Kenwood TS-440s that was working fine one day and the next I have no audio, the transmit light is on (but not transmitting). If I key up or send it appears to have power out. Display, auto tune, channel, and mode seems fine.
TS-440S Noisy audio fix. - YouTube
https://www.youtube.com/watch?v=vPK5zFEMBWY
This is a video for Matt KD8NCP showing how I took care of my noisy audio problem on the Kenwood TS-440S.Camera = badLighting = badBudget = $0
The AM Window: Tech: Mods: TS-440
https://www.amwindow.org/tech/htm/ts440/ts440mods.htm
Audio Options There are several ways to go about changing transmit audio. If one is comfortable with the use of audio processing gear then this can be effectively married to the 440 while allowing the stock speech circuit to be left alone. The external audio chain can be hooked directly into the balanced modulator with excellent frequency response.
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