Yaesu FT-7900R Operating Manual

Also see for FT-7900R: Technical supplement

15FT-7900R OPERATING MANUALANT JackConnect your antenna here, using a type-M plug (for USA version) or type-N plug (forEXP version) and coaxial cable.Cooling FanThe cooling fan rotates during transmission, and for 30 seconds after the radio returnsto the receive mode after transmitting.When the RF power amplifier’s heat sink reaches a moderately high temperature, thecooling fan will rotate automatically even if the radio is in the receive mode.DATA JackThis 6-pin mini-DIN connector provides simple interfacing to a packet Terminal NodeController (TNC) for 1200 bps or 9600 bps operation. The pin connections are shownon page 10.EXT SP JackThis 2-conductor, 3.5-mm mini phone jack provides audio output for an optional speaker.The optimum load impedance is 8 Ohms. Inserting a plug into this jack disables theaudio path to the transceiver’s internal speaker.13.8V DC Cable PigtailsThis is the DC power supply connection for the transceiver. Use the supplied DC cableto connect this pigtail to the car battery or base station DC power supply capable of atleast 10 Amperes (continuous duty). Make certain that the Red lead connects to thePositive (+) side of the power source, and that the Black lead connects to the Negative(–) side of the power source.REAR PANEL C ONNECTIONS