9GETTING ACQUAINTED 2ANT 1 and ANT 2 connectorsConnect your primary HF/ 50 MHz antenna to ANT 1connector. If you are using 2 antennas for the HF/50 MHz band, connect the secondary antenna to theANT 2 connector {page 1}.GND postConnect a heavy gauge wire or copper strap betweenthe ground post and the nearest earth ground {page 1}.AT connectorMates with the connector from the cable supplied withthe AT-300 external antenna tuner {pages 70, 73}.Refer to the instruction manual supplied with the tunerfor more information.DC 13.8 V connectorConnect a regulated 13.8 V DC power source to thisconnector {page 1}. Use the DC cable supplied withthe transceiver.COM connectorMates with a DB-9 female connector for connecting acomputer or compatible transceiver {pages 60, 69}.Also used with the Quick Data Transfer function {page59} and DX PacketCluster Tune function {page 67}.(USB) connectorMates with a USB connector for connecting acomputer via one of its USB ports {pages 60}.EXT.SP 8 jackMate with a 3.5 mm (1/8"), 2-conductor (mono) plugfor connecting an external speaker {page 2}.ACC 2 connectorMates with a 13-pin male DIN connector forconnecting various accessory equipment, such asan external TNC/ MCP or a RTTY terminal{page 69}.REMOTE connectorMates with a 7-pin male DIN connector for connectingan HF/ 50 MHz linear amplifier {page 65, 68}.KEY and PADDLE jacksThe KEY jack mates with a 3.5 mm (1/8") 2-conductorplug for connecting an external key for CW operation.The PADDLE jack mates with a 6.3 mm (1/4")3-conductor plug for connecting a keyer paddle tothe internal electronic keyer. Refer to “Keys for CW(PADDLE and KEY)” {page 2} before using these jacks.REAR PANELDRV connectorConnect a drive device to this RCA connector {page52}.RX ANT connectorConnect a separate receive-only antenna for HF lowbands to this RCA connector {page 52}.MICROPHONEPTT (Push-to-Talk) switchThe transceiver is placed in Transmission mode whenthis non-locking switch is held down. Releasing theswitch returns the transceiver to Reception mode./ Mic [UP]/ [DWN]Use these keys to step the VFO frequency, MemoryChannels, or Menu selections up and down.Press and hold these keys to continuously change thesettings.You can also change the operational function of thesekeys {page 56}