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The IC-7600 can key an amplifier circuit up to 250Vdc at 200 mA, select the correct keying mode via the ACC set menu. The ALC input level must be in the range 0 V to – 4 V. The transceiver does not accept positive volt-age. ===ACC set mode===Send Relay Type: Selects the switching relay type for [RELAY] from Lead and MOSFET. Select the suitable relay type when connecting a non-Icom linear amplifier. *Lead - Use mechanical relay. (16 V DC/0.5 A max.; default)*MOS-FET - Use semiconductor type relay. (250 V/200 mA max.) The IC-7600 can key an amplifier circuit up to 250Vdc at 200 mA, select the correct keying mode via the ACC set menu.