Kelvin Hughes Husun 55![]() It's not too difficult to make the Kelvin Hughes Husun 55 marine VHF suited for the reception of AIS by adding a discriminator output. Kelvin Hughes Husun 55
The receiver IC, a TK10420, can be reached easily. The unfiltered audio can be found on pin 9. It's quite strong (about 4 V peak-peak), which could damage a computer's soundcard. Therefore, an attenuation of about ten times is created by a two resistor voltage divider. ![]() ![]() Pin 9 of the TK10420 contains the baseband audio
The discriminator output
Follow the next steps to make the discriminator output:
![]() ![]() Reuse of one of the 3.5 mm sockets
Overview of the modification
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