RACORDER - The Marine Black Box

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INSTALLATION OF AUDIO OUTPUT IN THE ICOM M-120 VHF RADIO

R1 = 100K; R2 = 1 meg
We have found two different versions of this radio (are there others out there?).

Version one - receive audio connects to W175; transmit audio connects to the upper lead of R220.

Version two - receive audio connects to the second pin from the right (with the rear of the radio facing you) of a connector which goes to the volume control. Transmit audio connects to the upper lead of R71.

Updated August 25, 2004