pc78ltw.
pc78ltw.qxd 2/24/99 8:24 AM Page 2 Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Elimination of Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
pc78ltw.qxd 2/24/99 8:24 AM Page 1 Description Your Uniden PC78LTW represents the highest quality communications device designed for use in the Citizens Band Radio Service. It will operate on any of the 40 AM frequencies authorized by the Federal Communications Commission (FCC). The Citizens Band Radio Service is under the jurisdiction of the Federal Communications Commission (FCC).
pc78ltw.qxd 2/24/99 8:24 AM Page 2 Controls and Functions FRONT VIEW - PC78LTW BACKLIGHTED PANEL 1. Microphone Jack 2. ON OFF - VOLUME: Turns radio on or off; adjusts speaker volume. 3. SQUELCH: Reduces background noise when there is no incoming signal. 4. RF GAIN: Improves reception in strong signal areas. 5. MIC GAIN: Adjusts microphone sensitivity. 6. DELTA TUNE: Fine tunes the receiver. 7. SWR: Calibrates the meter for Standing Wave Ratio (SWR) measurements. 8.
pc78ltw.qxd 2/24/99 8:24 AM Page 3 17. CB/WX/PA Switch: Selects PA (Public Address) WX (Weather Radio) or CB. Do not use PA function unless an external speaker is connected. 18. S/RF/SWR/CAL: Selects meter function. S/RF - normal; SWR and CAL are for SWR measurements only. See page 8 for calibration procedures. 19. Multi-function Meter: Measures SWR, RF and S signal strength. REAR VIEW 20. POWER: Connects DC power to transceiver. 21. EXT. SP.
pc78ltw.qxd 2/24/99 8:24 AM Page 4 Installation MOBILE STATION INSTALLATION Plan the location of the transceiver and microphone bracket before beginning installation. 1. Select a location that is convenient for operating the radio, but does not interfere with the driver or passenger. 2. Install bracket with self-tapping screws provided. 3. Connect wiring. (See instructions for Connecting the Power Cords). 4. Attach the microphone bracket to the side of the radio. 5. Attach radio to bracket.
pc78ltw.qxd 2/24/99 8:24 AM Page 5 CONNECTING THE POWER CORDS We recommend connecting the power lead to the Ignition Switch Accessory Terminal. This way, the transceiver is automatically turned off when the ignition switch is turned off. Or, the power cord may be connected to an available terminal on the fuse block, or, to a point in the wiring harness. However, caution must be taken to prevent a short circuit. If in doubt, contact your vehicle dealer for information.
pc78ltw.qxd 2/24/99 8:24 AM Page 6 To Receive Be sure that the power source, antenna, and microphone are properly connected before proceeding. 1. Turn unit ON and set VOLUME Control to a comfortable level. 2. Select CHANNEL. 3. Set switch to NB/ANL. Dynamic Squelch Control automatically sets Squelch to the optimal level for stronger transmission and signal clarity. To scan for weaker signals, turn Dynamic Squelch Control off and perform the following steps: 4a.
pc78ltw.qxd 2/24/99 8:24 AM Page 7 Set SQUELCH only when the radio is not receiving a strong signal. 5. Adjust RF GAIN knob (small) to optimize reception in strong signal areas. 6. Adjust DELTA knob to reduce or eliminate adjacent channel interference. 7. Set meter switch to S/RF. Weather Information Your PC78LTW combines a CB Radio with a Weather Radio and a Weather Alert System. The Weather Radio continually broadcasts weather conditions.
pc78ltw.qxd 2/24/99 8:24 AM Page 8 To Transmit Perform a voltage Standing Wave Ratio (SWR) measurement prior to using the transmitter. A SWR ratio in excess of 2:1 may damage the transmitter. Be sure to read and understand Part 95, FCC Rules and Regulations before operating your transmitter. 1. Select a channel. 2. Adjust MIC GAIN. 3. When the channel is clear, press the microphone PTT switch and speak. Multi-Function Meter SWR Meter: Measures SWR (standing wave ratio) of antenna.
pc78ltw.qxd 2/24/99 8:24 AM Page 9 RF Meter: Measures RF Output Power for transmitter. To use, position the meter switch at S/RF. Press microphone PTT switch to read transmitting power. S-Meter: Measures incoming signal strength. To use, position the meter switch at S/RF. The meter swings to indicate signal strength. i.e. S 3, S 5, S 7 . . . Preventive Maintenance Every six months: 1. Check the Standing Wave Ratio (SWR). 2. Be sure all electrical connections are tight. 3.
pc78ltw.qxd 2/24/99 8:24 AM Page 10 Troubleshooting Problem Unit does not power up No reception Poor Reception No Transmission Low Transmission q Suggestion Check the ignition key position. q Check power cord connections. q Check fuse. q Check vehicle electrical system. q Check microphone connection. q Set CB/WX/PA switch to CB. q Check VOLUME and SQUELCH. q Check antenna. q Check antenna connection. q Set RF GAIN to MAX. q Check VOLUME and SQUELCH.
pc78ltw.qxd 2/24/99 8:24 AM Page 11 Radio Code Definitions The following list contains common “10-Codes” used by CB radio operators for faster communication and better understanding.
pc78ltw.qxd 2/24/99 8:24 AM Page 12 Specifications General Channels: CB Frequency Range: Weather Frequency Range: Frequency Control: Frequency Tolerance: Operating Temperature: Microphone: Input Voltage: Current Drain: Size: Weight: Antenna Connector: Meter: 40 26.965 to 27.405 MHz 162.400MHz (WX CH1) 162.425MHz (WX CH2) 162.450MHz (WX CH3) 162.475MHz (WX CH4) 162.500MHz (WX CH5) 162.525MHz (WX CH6) 162.550MHz (WX CH7) Phase Locked Loop (PLL) synthesizer ±0.
pc78ltw.qxd 2/24/99 8:24 AM Page 13 Two-Year Extended Warranty Important: Evidence of original purchase is required for warranty service. WARRANTOR: UNIDEN AMERICA CORPORATION (“Uniden”) ELEMENTS OF WARRANTY: Uniden warrants, for two years, to the original retail owner, this Uniden Product to be free from defects in materials and craftsmanship with only the limitations or exclusions set out below.
pc78ltw.
