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The Dosy FC-50S and FC-50SP is for radios without the black 6 pin hard-wired frequency counter connector on the back. The FC50 SP will work with AM and SSB radios. The radio connects via the two SO239 coax connectors on the back. You will need a short coax jumper to connect the counter to the radio (sold separately). The FC 50 S and FC 50 SP displays the frequency when the mic is keyed, on transmitt only. The easy to see bright blue display is visible in "direct" or "near direct" sunlight. Very nice when it's used in a vehicle.
Dosy FC-50SP Rear View