21-1579.fm Page 1 Thursday, August 5, 1999 9:34 AM Cat. No. 21-1579 OWNER’S MANUAL Please read before using this equipment.
1-1579.fm Page 2 Thursday, August 5, 1999 9:34 AM 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.
21-1579.fm Page 3 Thursday, August 5, 1999 9:34 AM 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. CAUTION RISK OF ELECTRIC SHOCK. DO NOT OPEN.
21-1579.fm Page 4 Thursday, August 5, 1999 9:34 AM TABLE OF CONTENTS Installation ...................................................................................................... Selecting a Location .................................................................................. Connecting an Antenna ............................................................................. Connecting the Microphone ....................................................................... Connecting Power .......
21-1579.fm Page 5 Thursday, August 5, 1999 9:34 AM 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.
21-1579.fm Page 6 Thursday, August 5, 1999 9:34 AM 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.
21-1579.fm Page 7 Thursday, August 5, 1999 9:34 AM CONNECTING POWER You can power your CB from either standard 120-volt AC or from a 12volt DC source, such as a storage battery. Using Standard 120-Volt AC Power Follow these steps to connect the CB to 12-volt DC power. 1. Connect the plug end of the DC power leads to the 13.8V DC power jack on the back of the CB. 2. Set the power select switch on the back of the CB to 13.8V DC.
21-1579.fm Page 8 Thursday, August 5, 1999 9:34 AM CONNECTING AN EXTERNAL SPEAKER CONNECTING HEADPHONES You can connect an external speaker to the EXT.SP. jack. Use an 8-ohm speaker that has a power rating of 3 to 10 watts and a 1/8-inch plug. To reduce distractions or help you hear weak signals, you can use your CB with monaural headphones that have a 1/4-inch plug and an impedance of 4, 8, 16, or 100 ohms. Plug the headphones' plug into the PHONES jack on the front of your CB.
21-1579.fm Page 9 Thursday, August 5, 1999 9:34 AM OPERATION Caution: Do not use your CB before you connect it to an antenna. 3. Turn RF GAIN to HIGH (fully clockwise). Before you start using your CB, you should know how to use it effectively and courteously. See “CB Courtesy” and “Using 10-Codes.” RECEIVING TRANSMISSIONS Note: You must connect the microphone to your CB or it will not receive. 4. Turn SQUELCH to MIN (fully counterclockwise) so you can hear background noise (hiss). 1.
21-1579.fm Page 10 Thursday, August 5, 1999 9:34 AM 7. Slowly turn SQUELCH to the right until the background hiss disappears. Notes: • Do not set SQUELCH too far to the right, or you cannot hear weak signals. • To receive very weak signals, turn SQUELCH to the left. You hear noise between transmissions, but you also hear weak signals (those not strong enough to completely break through the squelch). 8. Adjust VOLUME again to a comfortable listening level.
21-1579.fm Page 11 Thursday, August 5, 1999 9:34 AM Using CH9 Important: Channel 9 is reserved for motorist assistance and for reporting emergency information about accidents, hazardous road conditions, and so on. Always give emergency messages priority on Channel 9. You can instantly switch to Channel 9 at any time by pressing CH9. The display shows 9. The CHANNEL indicator shows the scanned frequencies, then stops at the incoming signal.
21-1579.fm Page 12 Thursday, August 5, 1999 9:34 AM Using RF GAIN Rotate this control to adjust your CB's sensitivity when receiving. Normally, you will leave this control set to HIGH. This is useful for blocking out weak stations, while still receiving nearby stations. • Help callers with directions, information about road conditions, and any other reasonable requests. • Always yield any channel for emergency transmissions.
21-1579.fm Page 13 Thursday, August 5, 1999 9:34 AM USING COMMON 10-CODES Code Meaning 10-15 Message delivered. 10-16 Reply to message. 10-17 En route. 10-18 Urgent. 10-19 Contact ___________. 10-20 What is your location? 10-21 Call ____________ by telephone. Cannot understand your message. 10-22 Cancel last message. 10-23 Arrived at the scene. 10-2 Your signal is good. 10-24 Assignment complete. 10-3 Stop transmitting. 10-25 Meet ____________.
21-1579.fm Page 14 Thursday, August 5, 1999 9:34 AM TROUBLESHOOTING If your CB is not working as it should, refer to the following charts to see if you can eliminate the problem. If you cannot, take the CB to your local Radio Shack store. DO NOT attempt repairs or adjustments yourself. Symptom: Trouble with reception Check Solution Insufficient volume? Adjust VOLUME as needed. Too much squelch? Adjust SQUELCH as needed. CB not on operating channel? Switch to active channel.
21-1579.fm Page 15 Thursday, August 5, 1999 9:34 AM NOISE REDUCTION Since the receiver section of your CB is very sensitive, it easily picks up even the smallest signals and amplifies them. Any noise that you hear from the CB most probably originates from external sources. The receiver itself is exceptionally quiet. If the noise is continuous and fairly loud, it cannot be totally eliminated by the automatic noise limiter (ANL) and noise blanker (NB) circuits. You must solve the problem at its source.
21-1579.fm Page 16 Thursday, August 5, 1999 9:34 AM CARE AND MAINTENANCE Your TRC-495 40-Channel CB Base Station Transceiver is an example of superior design and craftsmanship. The following suggestions will help you care for your CB so you can enjoy it for years. Keep the CB dry. If it gets wet, wipe it dry immediately. Liquids might contain minerals that can corrode the electronic circuits. Handle the CB gently and carefully.
21-1579.fm Page 17 Thursday, August 5, 1999 9:34 AM Internal adjustments and/or modification can lead to illegal operation as defined by FCC Rules, Part 95. Such illegal operation can lead to very serious consequences. 3. Align the tabs on the male end with the slots on the female end. Then press the two ends together and twist them both clockwise. To be safe and sure: • Never open your CB's case. • Never change or replace anything in your CB.
21-1579.fm Page 18 Thursday, August 5, 1999 9:34 AM SPECIFICATIONS RECEIVER Frequency Coverage............................................. All 40 CB Channels (Class D) 26.965 to 27.405 MHz Sensitivity ..................................................................... 0.7 µV for 10 dB S + N/N Adjacent Channel Rejection ....................................................... 60 dB (±10 kHz) Intermediate Frequency ........................ 1st IF = 10.695 MHz, 2nd IF = 455 KHz Audio Output ................
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21-1579.fm Page 20 Thursday, August 5, 1999 9:34 AM RADIO SHACK LIMITED WARRANTY This product is warranted against defects for 90 days from date of purchase from Radio Shack company-owned stores and authorized Radio Shack franchisees and dealers. Within this period, we will repair it without charge for parts and labor. Simply bring your Radio Shack sales slip as proof of purchase date to any Radio Shack store. Warranty does not cover transportation costs.
