Kelvin Hughes Husun 70 It's not too difficult to make the Kelvin Hughes Husun 70 marine VHF suited for the recepton of AIS by adding a discriminator output. Kelvin Hughes Husun 70
The receiver IC, a BA4112, is located on the main circuit board. To make the IC more easily accessible, the top microprocessor board can be expanded. The baseband audio can be found on pin 9 of the receiver IC.   Pin 9 of the BA4112 contains the unfiltered audio
The discriminator output
Follow the next steps to make the discriminator output:
 Because the case is isolated from the transceiver's internal ground, I have not put a chassis terminal in the case, but used a 'pig tail' in stead. If a small hole is drilled next to power leads, the shielded wire can be led outside and terminated with a female cinch plug. Obviously, it is also possible to use a longer cord and use a 3.5 mm plug to connect the signal directly with your PC's line or microphone input. The 'pigtail'
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