21-1704.fm Page 1 Thursday, August 5, 1999 1:20 PM Cat. No. 21-1704 OWNER’S MANUAL Please read before using this equipment.
1-1704.fm Page 2 Thursday, August 5, 1999 1:20 PM FEATURES Your RadioShack TRC-504 Compact 40-Channel Mobile CB Radio is a breakthrough in CB design technology. You can mount it in a vehicle for mobile use, or in your home for use as a base station. Backlit Controls — help you easily find the right control when you use the CB at night. Phase-Locked Loop (PLL) Frequency Synthesizer — provides highly accurate and stable tuning.
21-1704.fm Page 3 Thursday, August 5, 1999 1:20 PM FCC INFORMATION The Federal Communications Commission (FCC) does not require you to have a license to operate this CB radio. However, you must know Part 95 of FCC Rules. It explains the proper operation of a Class D citizen’s band transceiver. We enclosed a copy of Part 95 with your CB radio. Warning: Do not open the CB radio to make any internal adjustments. A CB radio is set up to transmit a regulated signal on an assigned frequency.
21-1704.fm Page 4 Thursday, August 5, 1999 1:20 PM CONTENTS Installation ............................................................................................................... 5 Attaching the Microphone Holder ....................................................................... 5 Mounting the Transceiver ................................................................................... 5 Connecting an Antenna .....................................................................................
21-1704.fm Page 5 Thursday, August 5, 1999 1:20 PM INSTALLATION ATTACHING THE MICROPHONE HOLDER You can attach the microphone holder to either side of the transceiver or to another location in your vehicle. To attach the holder to the transceiver, secure the holder to either side using the supplied 3 mm screws and lock washers. Note: If you cannot reach behind the mounting surface to attach the nuts on the machine screws, use the supplied 3 mm plain washers and self-tapping screws.
21-1704.fm Page 6 Thursday, August 5, 1999 1:20 PM Cautions: • If you use the CB in a vehicle, mount it securely to avoid damage to the CB or vehicle or injury to anyone in the vehicle during sudden starts or stops. • Do not mount the CB where it could damage or interfere with the operation of any passive restraint safety device (an airbag or seat belt). Follow these steps to mount the CB using the supplied hardware. 1.
21-1704.fm Page 7 Thursday, August 5, 1999 1:20 PM When you choose an antenna, keep in mind that, for the best performance, you should mount the antenna: • as high as possible on the vehicle • as far as possible from sources of electrical noise • vertically Once you choose an antenna, follow its mounting instructions. Then route the cable to the transceiver and connect the cable to the ANTENNA jack on the back of the transceiver.
21-1704.fm Page 8 Thursday, August 5, 1999 1:20 PM CONNECTING AN EXTERNAL SPEAKER Connecting a PA Speaker You can connect your transceiver to an external CB speaker, so you can hear an incoming call when you are outside your vehicle, or use the CB as a PA system. The PA speaker should: Connecting a CB Speaker The external speaker you use with the transceiver should have an impedance of 8 ohms and be able to handle 3 to 10 watts of power (such as RadioShack Cat. No. 21-549).
21-1704.fm Page 9 Thursday, August 5, 1999 1:20 PM USING VEHICLE BATTERY POWER Follow these steps to connect the transceiver to vehicle battery power. Red Wire to Switched Accessory Terminal Black Wire to Ground 1. Connect the red wire (with the inline fuse holder) on the back of the transceiver to a point in your vehicle’s fuse block that has power only when the ignition is in the ACC (accessory) or ON position. 2. Connect the black wire to a metal part of the vehicle’s frame (chassis ground).
21-1704.fm Page 10 Thursday, August 5, 1999 1:20 PM Caution: To prevent damage to the CB, be sure you connect an antenna and the microphone before you use the CB. Follow these steps to install the CB as a base station. Antenna Black Wire to Negative Terminal of DC Power Supply Red Wire to Positive Terminal of DC Power Supply 1. Mount the base station antenna as described in its owner’s manual. Warning: Use extreme caution when you install or remove a base station CB antenna.
21-1704.fm Page 11 Thursday, August 5, 1999 1:20 PM OPERATION Before you use your CB, you should know how to use it effectively and courteously. “Operational Hints” on Page 14 contains information that will help you get more enjoyment from your CB. RECEIVING TRANSMISSIONS AND ADJUSTING SQUELCH 1. Set PA/MON/CB to CB . 2. Turn SQUELCH fully counterclockwise. 3. Turn RF GAIN fully clockwise. 5. Set OUT/CH9/CH19 to OUT to select a channel other than an emergency channel. 6.
21-1704.fm Page 12 Thursday, August 5, 1999 1:20 PM 9. To turn off the CB, turn VOLUME counterclockwise until you hear it click. The display and indicators turn off. TRANSMITTING Note: We recommend you try receiving before you transmit. 1. Follow Steps 1–8 in “Receiving Transmissions and Adjusting Squelch.” 2. To transmit, hold down PUSH TO TALK on the microphone. The TX indicator lights.
21-1704.fm Page 13 Thursday, August 5, 1999 1:20 PM Follow these steps to use the PA amplifier. 1. Turn on the transceiver. Then set PA/MON/CB to PA. PA appears on the display. USING THE MONITOR FEATURE You can use your CB as a receiver to listen to transmissions on an optional PA speaker. With an optional PA speaker connected, set PA/MON/CB to MON. When PA/MON/CB is set to MON, your CB cannot transmit and you hear sound only from the external PA speaker. 2.
21-1704.fm Page 14 Thursday, August 5, 1999 1:20 PM OPERATIONAL HINTS Like most activities, CB radio has its customs and courtesies. The following tips will help you get the most enjoyment from your CB. COMMON USES FOR A CB • Truck drivers and delivery personnel can learn road and traffic conditions and get assistance in locating destinations. A CB radio is also good company on those “long hauls.
21-1704.fm Page 15 Thursday, August 5, 1999 1:20 PM USING COMMON 10CODES Code Meaning 10-16 Reply to message. Citizen’s band operators and CB radio users have largely adopted the 10codes for standard questions and answers. These codes permit faster communication and better intelligibility in noisy areas. 10-17 En route. 10-18 Urgent. 10-19 Contact _____. 10-20 What is your location? This table lists codes adopted by the Associated Public Safety Communications Officers (APCO).
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21-1704.fm Page 17 Thursday, August 5, 1999 1:20 PM TROUBLESHOOTING If your CB is not working as it should, follow these suggestions to see if you can eliminate the problem. If you cannot, take the CB to your local RadioShack store for assistance. Symptom CB has trouble receiving. Check/Try Turn transceiver power on. Microphone connected? Secure connections. Antenna connected? Secure connections. Too much squelch? Adjust as needed. Radio not on operating channel? Switch to active channel.
21-1704.fm Page 18 Thursday, August 5, 1999 1:20 PM Symptom PA does not work. Check/Try Connect a PA speaker. Secure connections. Be sure PA/MON/CB is set o PA. Adjust VOLUME . Sound is distorted. Adjust RF GAIN. Adjust VOLUME .
21-1704.fm Page 19 Thursday, August 5, 1999 1:20 PM REDUCING NOISE Because your CB is exceptionally quiet, any noise you hear is probably from an external source in your vehicle such as the alternator, another radio or spark plugs. The transceiver uses an ANL (Automatic Noise Limiter) circuit to reduce noise. However, if possible, try to eliminate the noise by finding its source. You can determine the noise’s source by turning off the engine and operating the CB with your vehicle’s ignition set to ACC.
21-1704.fm Page 20 Thursday, August 5, 1999 1:20 PM CARE AND MAINTENANCE Your RadioShack TRC-504 40-Channel Mobile CB Radio 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 can contain minerals that can corrode electronic circuits. Handle the CB gently and carefully.
-1704.fm Page 21 Thursday, August 5, 1999 1:20 PM REPLACING THE FUSE The TRC-504’s 2-amp in-line fuse helps protect your CB from power surges and short circuits. When replacement is required, use a 2-amp, slow-blow glass fuse, such as Cat. No. 270-1023. Caution: Do not use a fuse with ratings other than those specified here. Doing so might damage your CB. Follow these steps to replace the fuse. 1. Make sure the power source and CB are both off. 2.
21-1704.fm Page 22 Thursday, August 5, 1999 1:20 PM SPECIFICATIONS RECEIVER Frequency Coverage ................. All 40 CB Channels (Class D) 26.965–27.405 MHz Sensitivity for 10dB S/N .................................................................................. 0.6 mV Squelch Sensitivity ........................................................................................ 1000 mV Overall Audio Fidelity for 450–2500 Hz ............................................................
21-1704.fm Page 23 Thursday, August 5, 1999 1:20 PM GENERAL Power Requirements .................................................. 12 Volts DC, Negative Ground Dimensions (HWD) .............................. 15/8 ¥ 59/16 ¥ 83/8 inches (42 ¥ 141 ¥ 213 mm) Weight ................................................................................................. 2 lb 3 oz (1 kg) Included Accessories .....................................
21-1704.fm Page 24 Thursday, August 5, 1999 1:20 PM Limited Ninety-Day Warranty This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack companyowned stores and authorized RadioShack franchisees and dealers.
