Standard Horizon Explorer II![]() Standard Horizon's marine VHF Explorer II can be modified easily for the reception of AIS by adding a discriminator output. Standard Horizon Explorer II
The receiver IC can be found on the main circuit board, below the smaller circuit board. The two circuit boards can be separated by removing the plastic spacers. These are clicked to the circuit board. The unfiltered audio on the TK10420 can be found on pin 9. ![]() ![]() Pin 9 of the 10420 contains the baseband audio
The components soldered to pin 9
Follow the next steps to make the discriminator output:
![]() ![]() A suitable location for the chassis socket
Result
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