Duplex mode 3 might be used with a repeater where in-cabinet repeat cannot be disabled. It has the advantage of no audio delay introduced from app_rpt. However, the disadvantage is reduced repeater control: time out timer, Tx on/off, CTCSS on/off and repeat audio level adjustment must be provided external to app_rpt. | Duplex mode 3 might be used with a repeater where in-cabinet repeat cannot be disabled. It has the advantage of no audio delay introduced from app_rpt. However, the disadvantage is reduced repeater control: time out timer, Tx on/off, CTCSS on/off and repeat audio level adjustment must be provided external to app_rpt. |