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Cat. No. 21-1579
OWNER’S MANUAL
Please read before using this equipment.
TRC-495
40-Channel CB Base Station Transceiver
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FEATURES
Your Radio Shack TRC-495 40Channel CB Base Station Transceiver is a compact, 40-channel CB specially designed for use as a Class D citizen's band base station. The TRC-495 transmits with the maximum power allowed by the FCC, so your signal really gets out. Its built-in PLL (phase-locked loop) frequency synthesizer uses a precise frequency reference crystal for reliable and exact tuning.
You can operate the CB from either 120 volts AC or 12 volts DC, so you can use it at home or the office, even when AC power fails. With a base station in your home or office and a mobile CB in your vehicle, you can stay in touch wherever you go, without the expense of mobile telephone operation. You can also talk with other CBs for business or just for fun.
Your CB also has the following valuable features:
Large Analog Meter — lets you see how well you are “getting out,” and how well others are “getting in.”
Scan — seeks out other CB users by searching through all channels for transmissions.
Switchable Noise Blanker and Automatic Noise Limiter — reduce interference from ignition systems, motors, and other electrical equipment.
RF Gain Control — helps prevent overloading from strong signals.
Hysteresis Squelch Circuit — compensates for signal fading and eliminates signal chopping when you listen to a broadcast.
Two Ceramic Filters — give superior selectivity and freedom from adjacent channel interference.
CH9 Switch — lets you quickly switch to Channel 9, used for emergencies or motorist assistance.
Channel Display — shows the selected channel in large red digits, for easy viewing in most lighting conditions.
NB, ANL, and SCAN Indicators — show you when you are in the Noise Blanker, Automatic Noise Limiter, or Scan mode.
External Speaker and Headphone Jacks — let you connect another speaker or headphones to your CB.
©1995 Tandy Corporation. All Rights Reserved.
Radio Shack is a registered trademark used by Tandy Corporation.
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Note: You need a base station antenna to operate this CB. Your local Radio Shack store has a variety of antennas. See “Connecting an Antenna.”
For your records, we urge you to record the serial number of your CB in the space below. You'll find the serial number on the back panel of the CB.
Serial Number _________________
Warning: To prevent fire or shock hazard, do not expose this product to rain or moisture.
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CAUTION |
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RISK OF ELECTRIC SHOCK. |
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DO NOT OPEN. |
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CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER OR BACK. NO USER-SERVICE- ABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
This symbol is intended to alert you to the presence of uninsulated dangerous voltage within the product’s enclosure that might be of sufficient magnitude to constitute a risk of electric shock. Do not open the product’s case.
This symbol is intended to inform
!you that important operating and maintenance instructions are in-
cluded in the literature accompanying this product.
FCC STATEMENT
The Federal Communications Commission (FCC) does not require you to get a CB license to operate your CB. However, you are required to know Part 95 of FCC Rules. This information applies to the operation of a Class D citizen's band CB. A copy of Part 95 is enclosed with your CB.
Your CB might cause TV or radio interference, even when it is operating properly. To determine whether your CB is causing the interference, turn off your CB. If the interference goes away, your CB is causing the interference. Try to eliminate the interference by:
•Moving your CB away from the receiver.
•Connecting your CB to an outlet that is on a different electrical
circuit from the receiver.
•Contacting your local Radio Shack store for help.
If you cannot eliminate the interference, the FCC requires that you stop using your CB.
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TABLE OF CONTENTS |
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Installation ...................................................................................................... |
5 |
Selecting a Location .................................................................................. |
5 |
Connecting an Antenna ............................................................................. |
5 |
Connecting the Microphone ....................................................................... |
6 |
Connecting Power ..................................................................................... |
7 |
Using Standard 120-Volt AC Power .................................................... |
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Using 12-Volt DC Power ..................................................................... |
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Connecting an External Speaker ............................................................... |
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Connecting Headphones ........................................................................... |
8 |
Operation ........................................................................................................ |
9 |
Receiving Transmissions ........................................................................... |
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Transmitting ............................................................................................. |
10 |
Using Special Controls ........................................................................... |
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Using CH9 .......................................................................................... |
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Using SCAN ....................................................................................... |
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Using NB and ANL ............................................................................. |
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Using RF GAIN ................................................................................. |
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CB Courtesy ............................................................................................ |
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Maximum Range ..................................................................................... |
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Using Common 10-Codes ....................................................................... |
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Troubleshooting ........................................................................................... |
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Noise Reduction ...................................................................................... |
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Care and Maintenance ................................................................................. |
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Replacing the Fuse .................................................................................. |
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Specifications ............................................................................................... |
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INSTALLATION
SELECTING A
LOCATION
Choose a location for your CB that is near a standard AC power outlet and your antenna installation and away from sources of electrical noise.
CONNECTING AN
ANTENNA
An antenna is an important part of your CB installation. Choose and install the antenna with care.
Consider the following when you install the antenna:
•Mount the antenna as far as possible from soures of electrical noise (power lines, transformers, ignition systems, electrical motors, and so on) and keep the antenna's cable away from these noise sources.
•Provide a good ground for the antenna with UL-listed components.
•Be sure the antenna cable's shield is securely connected.
•Mount the antenna as high as possible without exceeding 60 feet above the ground or 20 feet higher than the highest point on a building.
•For the best performance, the antenna must be tuned (see the instructions provided with the antenna) and positioned vertically.
Select an antenna with a PL-259 connector. This type of antenna works most efficiently as a base station antenna. For example, a 1/2- wave base station antenna (Radio Shack Cat. No. 21-967) is a high-effi- ciency antenna that has omni-direc- tional characteristics. You can use this type of antenna for medium and long-range communications.
Use coaxial cable with an impedance of 50 ohms to connect the antenna to your CB. We suggest you use RG58/U for lengths under 10 feet, or RG-8/U for longer lengths, and keep the length of the antenna cable to a minimum.
Once you select the antenna, mount it following the instructions supplied with it. Then route the cable to the CB and connect the cable to the ANT connector on the back of the CB.
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Warning: When installing or removing a base station CB antenna, use extreme caution. If the antenna starts to fall, let it go! It could contact overhead power lines. If the antenna touches the power line, contact with the antenna, mast, cable, or guy wires can cause electrocution and death. Call the power company to remove the antenna. DO NOT attempt to do so yourself.
Connect the microphone cable to the MIC jack on the front panel. Press the tab on the top of the microphone plug and match the notch in the plug with the top notch in the jack. Then insert the plug into the jack.
CONNECTING THE MICROPHONE
Mount the supplied microphone clip on the left side of the CB, horizontally or vertically, using the two supplied screws. Then slide the microphone onto the microphone holder.
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To remove the microphone cable, press the tab and pull the plug out of the jack. Never pull on the microphone cable.
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