Yaesu FTDX-9000MP Operation Manual

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Page 21FT DX 9000MP OPERATION MANUALFRONT P ANEL C ONTROLSKEY JackThis 1/4-inch, 3-contact jack accepts a CW key orkeyer paddles (for the built-in electronic keyer), oroutput from an external electronic keyer. Pinout isshown on page 16. Key up voltage is 5 V, and keydown current is 1 mA. This jack may be configuredfor keyer, “Bug,” “straight key,” or “computer keyinginterface operation” via Menu Selection [MODE-CW041 F-KEYER TYPE] (see page 137). There is an-other jack with the same name on the rear panel, andit may be configured independently for Internal Keyeror pseudo-straight-key operation.NoteYou cannot use a 2-contact plug in this jack (to do soproduces a constant “key down” condition).Cannon (“XLR”)Microphone ConnectorThis Cannon-type (XLR) connector accepts input fromthe Microphone or other XLR-equipped microphonesystem. MIC connector pinout is shown on page 15.Proper microphone input impedance is 500 ~ 600Ohms.If you are using a condenser microphone requiring 48Volts DC, you may enable this voltage to appear onthe microphone line; see page 81. When the 48-voltsupply line has been enabled, the LED adjacent to theMIC jack will glow red.To disconnect the microphone plug, draw out the mi-crophone plug while pressing and holding in the sil-ver push-button.IPO (Intercept Point Optimization) SwitchThe IPO(A) Lamp-button may be used to set theoptimum receiver front end characteristics of the mainreceiver circuit for a very strong-signal environment.Selecting IPO bypasses the front end RF amplifier andfeeds the received signals directly to the first mixer ofthe main band (VFO-A) receiver circuit. While theIPO feature is activated, this button will remain illu-minated.The IPO(B) Lamp-button, similarly, allows directfeed of the received signals to the first mixer of thesub band (VFO-B) receiver circuit. While the IPOfeature is activated on the sub receiver, this buttonwill be lit.AdviceThe FT DX 9000MP’s first mixer is an active type,using four SST310 Junction FETs. This mixer designprovides gain to the receiver chain, so the noise figureof the receiver is fundamentally lower than with someother designs. Therefore, it frequently is not neces-sary to utilize the RF preamplifier, and the receiverIntercept Point will be substantially increased by en-gaging IPO, so as to feed the incoming signals directlyto the first (active) mixer. We recommend that IPO beswitched on whenever possible.ANTENNA SELECT SwitchesThese momentary buttons select the antenna jack onthe rear panel, with the selection indicated by the LEDin each button. When an antenna has been selectedfor operation on the main band (VFO-A), the LED inthe button glows red. When an antenna has been se-lected for operation on the sub band (VFO-B), theLED in the button glows umber.TUNE SwitchThis is the on/off switch for the FT DX 9000MP’s Au-tomatic Antenna Tuner.Pressing this button momentarily places the antennatuner in line between the transmitter final amplifierand the antenna jack (the LED will become illumi-nated). Reception is not affected.Pressing and holding in this button for 1/2 second,while receiving in an amateur band, activates the trans-mitter for a few seconds while the automatic antennatuner rematches the antenna system impedance forminimum SWR. The resulting setting is automaticallystored in one of the antenna tuner’s 100 memories,for instant automatic recall later when the receiver istuned near the same frequency.Pressing this button momentarily, while the Tuner isengaged, will take the Automatic Antenna tuner out ofthe transmit line.NoteWhen the Automatic Antenna tuner is tuning itself, asignal is being transmitted. Therefore, be absolutelycertain that an antenna or dummy load is connected tothe selected antenna jack before pressing and holdingin the TUNE button to start antenna tuning.