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Install an EXTERNAL amplifier keying port.
We use an RCA jack in the back for a TX output PORT to your external device. Every time you key it provides a connection between the +/- of the RCA connector.
1) Output RCA completely isolated from the radio. +/- of RCA connects to a relay that isolates it from the radios circuits.
2) Optional BYPASS switch in case your external device does not have one. (turns port off (stays open))
3) Works all the time in high or low power modes..
4) Heavy duty relay can handle any keying circuit voltage, even the SB-220’s – 120VDC circuit.

