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Radio Shack 21-1620, Owner'S Manual

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Radio Shack 21-1620 Owner'S Manual Download Page 24

24

ADDING CRYSTALS

Your TRC-235 includes two crystals
(transmit and receive) installed in channel
position A. The crystals let you use the CB
on channel 14. You can add two more
crystals in channel positions B and C so
you can use any two other channels of the
40 allotted to CBs. However, you must
use only crystals specifically designed for
the TRC-235, available from your local
RadioShack store. Be sure to specify the
channel you want and the TRC-235’s cat-
alog number (Cat. No. 21-1620).

Note: Channel A crystals are soldered in,
and can be replaced only by a qualified
technician.

The following chart shows the frequency
pairs (in

 

MHz

) 

for receiving and transmit-

ting on each CB channel.

Note: Receive crystals use a frequency
455 kHz lower than transmit crystals.

Channel

Transmit

Receive

1

26.965

26.510

2

26.975

26.520

3

26.985

26.530

4

27.005

26.550

5

27.015

26.560

6

27.025

26.570

7

27.035

26.580

8

27.055

26.600

9

27.065

26.610

10

27.075

26.620

11

27.085

26.630

12

27.105

26.650

13

27.115

26.660

14

27.125

26.670

15

27.135

26.680

21-1620.fm  Page 24  Thursday, August 5, 1999  11:16 AM

Summary of Contents for 21-1620

Page 1: ...OWNER S MANUAL Cat No 21 1620 TRC 235 2 Watt 3 Channel CB Walkie Talkie Please read before using this equipment 21 1620 fm Page 1 Thursday August 5 1999 11 16 AM ...

Page 2: ...ny two of the other 39 available CB channels See Adding Crystals on Page 24 Built In Modulation Limiter Circuit automatically adjusts to a variety of voice levels to ensure a clear transmission Crystal Controlled Circuitry provides accurate and stable channel selection Adjustable Squelch helps to eliminate noise between transmissions Telescoping Antenna provides excel lent reception and transmissi...

Page 3: ...ate this walkie talkie However the FCC does require that you read and know Part 95 of FCC Rules These rules apply to the operation of a Class D CB We have provided a copy of these regulations with your TRC 235 Internal adjustments and or modifications can lead to illegal operation as defined by Part 95 of FCC Rules Such illegal operation can lead to very serious consequences To be safe and sure Ne...

Page 4: ...way your TRC 235 is causing it Try to eliminate the interference by Moving your TRC 235 away from the TV or radio Contacting your local RadioShack store for help Warning Do not open your TRC 235 to make any internal adjustments other than installing or changing crystals Any inter nal adjustments should be made only by authorized service personnel 21 1620 fm Page 4 Thursday August 5 1999 11 16 AM ...

Page 5: ...Power 12 Using AC Power 13 External Antenna 15 Operation 17 Receiving Transmissions and Adjusting Squelch 17 Transmitting 19 CB Operation Tips 20 Common Uses for a CB Radio 20 Business Uses 20 Personal Uses 20 Using Common 10 Codes 21 CB Courtesy 23 Maximum Range 23 Adding Crystals 24 Troubleshooting 28 Maintenance 29 Specifications 30 21 1620 fm Page 5 Thursday August 5 1999 11 16 AM ...

Page 6: ...AND ALKALINE NI CD SWITCH The POWER jack lets you connect an ex ternal power source such as your vehi cle s battery power or AC power to power the TRC 235 or connect a battery charg er to charge nickel cadmium batteries while they are in the TRC 235 The TRC 235 also has a slide switch AL KALINE NI CD inside the battery com partment which you must set correctly depending on what power source you ar...

Page 7: ...elf or damaging the TRC 235 connect a bat tery charger to the POWER jack only when nickel cadmium batteries are in stalled see Recharging Nickel Cadmium Batteries on Page 10 Never try to re charge non rechargeable batteries They could get very hot and explode Note You can connect an external pow er source regardless of the type of batter ies you installed USING BATTERIES You can power the TRC 235 ...

Page 8: ...e batteries of different capacities Follow these steps to install the batteries 1 If the TRC 235 is on turn OFF VOLUME fully counterclockwise until it clicks to turn it off 2 Slide the strap on the back of the TRC 235 through the buckle and the battery compartment cover to re move it 3 Slide the battery compartment cover in the direction of the arrow to remove it 21 1620 fm Page 8 Thursday August ...

Page 9: ...ls and marked inside Note Before you use the TRC 235 with nickel cadmium batteries you need to charge the batteries see Recharging Nickel Cadmium Batter ies on Page 10 6 Replace the battery compartment cover and the strap on the back of the TRC 235 Cautions If you will not be using the TRC 235 from battery power for several months remove the batteries Dispose of old batteries promptly and properly...

Page 10: ...harge or recharge nickel cadmium batteries while they are inside the TRC 235 s bat tery compartment Do not use the TRC 235 while you are charging the nickel cadmium batteries Cautions Use only the recommended battery charger to recharge the batteries in the TRC 235 Other chargers could damage your TRC 235 or the batter ies Be careful not to overcharge nickel cadmium batteries To prevent damage to ...

Page 11: ...partment to NI CD see Us ing the Power Jack and Alkaline NI CD Switch on Page 6 3 Connect the battery charger s barrel plug to the POWER jack on the side of the TRC 235 then plug the bat tery charger s plug into a standard AC outlet It takes about 20 hours to charge new or fully discharged nickel cadmium batteries Subsequent charges take about 14 to 16 hours 21 1620 fm Page 11 Thursday August 5 19...

Page 12: ...ion on recycling or disposal programs in your area Some options that might be available are municipal curbside collec tion drop off boxes at retailers such as your local RadioShack store recycling col lection centers and mail back programs USING VEHICLE BATTERY POWER You can power your TRC 235 from your vehicle s cigarette lighter socket with an optional 12 volt DC fused power cord such as Cat No ...

Page 13: ... DC power cord unplug the cord from the ciga rette lighter socket and clean any ashes or debris from the socket If your TRC 235 still does not work check the fuse in the DC power cord and replace it if necessary USING AC POWER You can power your TRC 235 from stan dard AC power using an optional 12 volt AC adapter that provides 1 amp such as RadioShack Cat No 273 1653 Cautions The adapter must be a...

Page 14: ... 1 Connect the adapter s 5 5 mm outer diameter 2 1 mm inner diameter bar rel plug to the adapter s cord setting TIP to positive 2 Be sure ALKALINE NI CD inside the battery compartment is set to ALKA LINE 3 Connect the adapter s barrel plug to the TRC 235 s POWER jack 4 Plug the other end of the adapter into a standard AC outlet 21 1620 fm Page 14 Thursday August 5 1999 11 16 AM ...

Page 15: ...r the following The location of the antenna should be as high as possible The antenna and antenna cable should be as far as possible from sources of electrical noise appli ances other radios and so on The antenna should be vertical for the best performance Notes When connecting an optional an tenna always use 50 ohm coaxial cable such as RG 58 or RG 8 For lengths over 50 feet use RG 8 low loss die...

Page 16: ... cables Do not run the cable through a vehi cle s engine compartment or other areas that produce extreme heat Follow all cautions and warnings included with the antenna 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 cab...

Page 17: ... TRC 235 s telescoping antenna and hold the TRC 235 so the antenna is ver tical Caution Unless an external an tenna is attached you should fully extend the antenna for maximum efficiency 2 Set CHANNEL to A B or C Note Your TRC 235 comes with Channel 14 crystals installed in channel position A To use other channels you must first install crys tals in channel positions B and C inside the TRC 235 see...

Page 18: ...C 4 Adjust OFF VOLUME to a comfortable listening level 5 Adjust SQUELCH to cut out the back ground noise To do this wait until there is no signal on the channel Then slowly turn SQUELCH clock wise until the background noise stops Note Do not turn SQUELCH too far clockwise because you might also cut out weak signals 6 To turn off the TRC 235 turn OFF VOLUME toward OFF until it clicks 21 1620 fm Pag...

Page 19: ...oudly when transmitting It does not make your signal any stronger and might distort your transmission Important Channel 9 is reserved for motorist assistance and for reporting emergency information about acci dents hazardous road conditions and so on If you have installed the necessary crystals in your TRC 235 and you are using Channel 9 always give emergency messages priority 3 To turn off the TR...

Page 20: ...For security officers a walkie talkie is more than a convenience it is a must for both safety and efficiency Personal Uses Keep in touch with home while driv ing to work to the store or to a social activity Let your family know you are tied up in traffic or that you will stop by the store on the way home If you are a two car or more family walkie talkies are great for communi cating with family me...

Page 21: ... areas This table lists the codes adopted by the Associated Public Safety Communica tions Officers APCO Code Meaning 10 1 Cannot understand your mes sage 10 2 Your signal is good 10 3 Stop transmitting 10 4 Message received and under stood 10 5 Relay information to _________ 10 6 I am busy 10 7 Out of service 10 8 In service 10 9 Repeat last message 10 10 Negative No 10 11 _____________ in service...

Page 22: ...o message 10 17 En route 10 18 Urgent 10 19 Contact __________ 10 20 My location is __________ 10 21 Call ________ by telephone 10 22 Cancel last message 10 23 Arrived at the scene 10 24 Assignment complete 10 26 Estimated time of arrival is ____ 10 30 Use caution 10 31 Pick up 10 33 Emergency traffic Clear the channel 10 34 The time is _____ Code Meaning 21 1620 fm Page 22 Thursday August 5 1999 ...

Page 23: ...mation about road conditions and any other reasonable requests MAXIMUM RANGE The maximum range and quality of CB transmissions vary depending on these conditions Amount of power in the batteries The surrounding terrain moun tains and tall buildings limit the range Weather conditions The number of nearby CBs operating on the same channel To ensure maximum range always keep fresh alkaline batteries ...

Page 24: ... the TRC 235 s cat alog number Cat No 21 1620 Note Channel A crystals are soldered in and can be replaced only by a qualified technician The following chart shows the frequency pairs in MHz for receiving and transmit ting on each CB channel Note Receive crystals use a frequency 455 kHz lower than transmit crystals Channel Transmit Receive 1 26 965 26 510 2 26 975 26 520 3 26 985 26 530 4 27 005 26...

Page 25: ...6 710 18 27 175 26 720 19 27 185 26 730 20 27 205 26 750 21 27 215 26 760 22 27 225 26 770 23 27 255 26 800 24 27 235 26 780 25 27 245 26 790 26 27 265 26 810 27 27 275 26 820 28 27 285 26 830 29 27 295 26 840 30 27 305 26 850 31 27 315 26 860 32 27 325 26 870 33 27 335 26 880 34 27 345 26 890 35 27 355 26 900 36 27 365 26 910 37 27 375 26 920 38 27 385 26 930 39 27 395 26 940 40 27 405 26 950 Cha...

Page 26: ...to remove the back cover s three screws Caution The BATT TEST button might come off of the front of the TRC 235 when you remove the front cover If this happens simply replace it 5 Firmly grasp the TRC 235 s front and back cover s sides and carefully pull the front cover away from the back cover 21 1620 fm Page 26 Thursday August 5 1999 11 16 AM ...

Page 27: ... you do the TRC 235 will transmit and receive on frequencies outside the citizen s band resulting in illegal operation 7 When you have finished installing new crystals carefully fit the TRC 235 s front cover to the back cover and gently squeeze them together Make sure the BATT TEST indicator shows through the front of the TRC 235 when you reassemble it 8 Replace CHANNEL on the front of the TRC 235...

Page 28: ...xtended Be sure the batteries are not weak see Testing the Battery Power on Page 10 Be sure you are not pressing PUSH TO TALK Be sure CHANNEL is set to A if you have not installed additional crystals in the TRC 235 Trouble with transmis sion Be sure the antenna is fully extended Be sure you are fully pressing PUSH TO TALK Be sure the batteries are not weak see Testing the Battery Power on Page 10 ...

Page 29: ...normal temperature environments Temperature extremes can shorten the life of electronic devices damage batteries and dis tort or melt plastic parts Keep the TRC 235 away from dust and dirt which can cause premature wear of parts Wipe the TRC 235 with a damp cloth occasionally to keep it looking new Do not use harsh chemicals clean ing solvents or strong deter gents to clean the TRC 235 Modifying o...

Page 30: ...0 mA Transmitter Frequency Coverage 26 965 27 405 MHz Power Input at 12V DC 2 W Power Output 1 W Spurious Emission 70 dB Type of Modulation A3 Frequency Tolerance 0 003 Antenna Impedance 50Ω Antenna Length Maximum 423 8 In 1076 mm Current Drain 260 to 450 mA Dimensions HWD 813 16 213 16 21 8 In 224 72 54 mm Weight 14 5 oz 410 g Specifications are typical individual units might vary Specifications ...

Page 31: ...31 NOTES 21 1620 fm Page 31 Thursday August 5 1999 11 16 AM ...

Page 32: ...warranty pe riod take the product and the RadioShack sales receipt as proof of purchase date to any RadioShack store Ra dioShack will at its option unless otherwise provided by law a correct the defect by product repair without charge for parts and labor b replace the product with one of the same or similar design or c refund the pur chase price All replaced parts and products and prod ucts on whi...

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