Radio Shack 10M User's Manual
Contents
1. the threaded end 4 of the top element 1 3 Insert the threaded end of the top element into the threads on the F center element 3 screw the top element into the center ele ment then use a 1 2 inch wrench to tighten it Place the supplied 2 inch lock washer 4 over the threaded end 3 of the center element 5 Insert the threaded end of the center element into the threads on the bottom element 5 screw the center element into the bottom element then use a 1 inch wrench to tighten it lt C gt A m 7 i Hold the assembled antenna vertically next to the structure where you want to mount it then slide the supplied U bolts 6 over the antenna and the structure Slide the supplied brackets 7 over the ends of the U bolts then use the supplied lock washers 8 and hex nuts 9 to secure it i gt ii in N D Caution To avoid damaging the bottom element do not over tighten the hex nuts 8 Connect one end of the coaxial cable not supplied to the con Fa nector on the bottom of the bottom element Then route the cable Hip to your radio and connect it to the antenna jack on the back of the radio 785 Important Your antenna is designed to let excess moisture escape ke from inside the bottom element Do not use a silicone sealant or T ay a caulking material around any part of your antenna to seal it Other wise the antenna might not work properly Is WB WP CIIN A 21 869 fm Pag2. 5 Set the tuning rings on the bottom element of the antenna to their low est position Note If you trim too much off of the top element or use the antenna for a differ ent frequency later you can order a re placement top element from your local RadioShack store If you need to pre tune the antenna to a frequency lower than 28 MHz use an antenna tuner not supplied Assembling and Mounting the Antenna Before you can use the antenna you must assemble and mount it then con nect it to your radio You can mount the antenna outdoors on a vertical solid ob ject such as a TV antenna mast For the best results mount the antenna vertical ly as high as possible away from trees or other obstructions Higher frequencies are noticeably affected by obstructions Important e Do not mount the antenna on a metal surface such as aluminum siding This greatly reduces the antenna s ability to receive signals Before you assemble the antenna prepare the structure that you will mount it to RadioShack stores carry standard TV masts which you can use to mount the antenna Make sure the supplied U bolts will fit around whichever mast you choose 3 w EN LIN A 21 869 fm Page 4 Wednesday October 13 1999 11 50 AM A AID Follow these steps to assemble and mount the antenna 1 Lay the antenna s components on the ground in a flat open area 2 Place the supplied s inch lock washer 2 over
3. Make sure the SWR meter is con nected correctly to the antenna and your radio The antenna or radio might not be properly grounded Make sure the antenna and radio are properly grounded WB iss A 21 869 fm Page 7 Wednesday October 13 1999 11 50 AM v CIIN SPECIFICATIONS RecepliON reniri eee VHF and UHF Pre tuned for 27 205 MHz Half Wave Gai EE E A E E ld EEE EE ET 9 9 dBi Optimum SWR Range cccececcceseeeeeeeeeeeseeeeeeeeeneeeeeeeseeeeeeeseeeeeeesieeeeeeee Less than 1 5 1 Height ssembl d ee iara apearen e a paea aae E aaee ERa eaea aE EFANS 17 5 feet 5 3 m Maximum Diametep a hesret ianareo aa napa aapa eaaa e iaaa iaai E e eend aiai 1 8 inches 34 mm WOIQKE EEE EEEE T TET E T 4 Ibs 15 oz 2 24 kg Specifications are typical individual units might vary Specifications are subject to change and improvement without notice w EN 21 869 fm Page 8 Wednesday October 13 1999 11 50 AM LIN I lt Limited Ninety Day Warranty This product is warranted by RadioShack against manufacturing defects in material and workman ship under normal use for ninety 90 days from the date of purchase from RadioShack company owned stores and authorized RadioShack franchisees and dealers EXCEPT AS PROVIDED HEREIN RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN D
4. URATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN EXCEPT AS PROVIDED HEREIN RadioShack SHALL HAVE NO LIABIL ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE SPECT TO ANY LIABILITY LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR RANTY INCLUDING BUT NOT LIMITED TO ANY DAMAGES RESULTING FROM INCONVE NIENCE LOSS OF TIME DATA PROPERTY REVENUE OR PROFIT OR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF RadioShack HAS BEEN AD VISED OF THE POSSIBILITY OF SUCH DAMAGES Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in cidental or consequential damages so the above limitations or exclusions may not apply to you In the event of a product defect during the warranty period take the product and the RadioShack sales receipt as proof of purchase date to any RadioShack store RadioShack will at its option un less 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 purchase price All replaced parts and products and products on which a refund is made become the prop erty of RadioShack New or reconditioned parts and products may be used in the performance of warranty service Repaired or replaced parts and products are warrant
5. WB GIN 21 869 fm Page 1 Wednesday October 13 1999 11 50 AM R RadioShack Cat No 21 869 10M Ham CB Base Antenna Your RadioShack 10M Ham CB Base Antenna provides excellent reception of amateur radio CB and commercial radio signals The antenna can handle up to 2000 watts of transmit power Your antenna s features include Electrical Half Wave Design pro vides high gain Note To improve your antenna s gain you can connect an optional ground plane kit available through your local RadioShack store to your antenna Three Easy to Assemble Sections help you quickly and easily assemble the antenna Dual Tuning Rings help you quickly set the antenna for optimum perfor mance over a wide range of frequencies Ultraviolet Inhibitor the antenna s UV protected housing is made of impact resistant fiberglass making the exterior resistant to weathering and color change Strong Internal Construction pre vents the antenna s internal wires from rattling for maximum strength IMPORTANT SAFETY PRECAUTIONS Many do it yourself and professional an tenna installers are injured or killed each year by electric shock Many power wires are within 20 to 25 feet of the ground and could easily be touched by an assembled antenna or cable Touching the overhead wires with any part of the antenna is the same as touching the wires with your bare hand Contacting an electrical wire almost alw
6. WR is as low as possible at both ends of the band 6 When you have set the desired SWR tighten the tuning rings against each other by simulta neously turning the top ring down clockwise and the bottom ring up counterclockwise to lock them After you have properly installed and tuned your antenna use a watt meter not supplied to test the amount of pow er your transmitter is sending to your an tenna If you have properly tuned the antenna the meter should show the transmitter s maximum output power and the SWR meter should show very low re flected power lt l Is WP CIIN A 21 869 fm Page 6 Wednesday October 13 1999 11 50 AM TROUBLESHOOTING If you have problems mounting or tuning your antenna here are some suggestions that might help If you still have trouble contact your local RadioShack store for assistance PROBLEM POSSIBLE CAUSE SOLUTION SWR reading is too high or cannot be set Depending on the frequency you want to use it for the antenna might be too long or too short Pre tune the antenna see Pre Tuning the Antenna on Page 3 The antenna is not installed in a good location Move the antenna to a different location and try again The coaxial cable might be broken or damaged Use another coaxial cable The coaxial cable might be coiled Uncoil the coaxial cable The SWR meter might be con nected incorrectly
7. able after installing it Use only round headed staples Any clamps or securing devices used with coaxial cable should grip the cable evenly about the circum ference without crushing the cable Flat staples can damage coaxial cable Always use 50 ohm coaxial cable such as RG 58 or RG 8 to connect the anten na to your radio For lengths over 50 feet use RG 8 low loss dielectric coaxial cable Your local RadioShack store car e Do not expose coaxial cable to a temperature greater than 176 F 80 C Keep the cable away from heating vents and water heaters ries a wide variety of coaxial antenna ca Do not install coaxial cable where it ble and connectors will be crushed stuffed wedged or pinched Warning When you install an outdoor 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 con tact with the antenna mast cable or guy wires can cause electrocution and death Call the power company to re move the antenna Do not attempt to remove it yourself e The cable s jacket withstands most outdoor environments However you must seal connections and splices to prevent moisture from entering them Cautions e Do not run the cable over sharp edges or moving parts that might damage it e Do not run the cable next to power cables or other antenna cables Is WB WB N A 21 869 fm Pag
8. ays results in a very serious shock To avoid electric shock please read and follow these important safety precautions Be sure to select an antenna site well away from all overhead wires e Do not try to guess which overhead wires carry high voltage Check with the power company e If you notice anything making con tact with the overhead wires call the power company to have it removed Do not run the antenna s cable over power wires e Get help from a qualified profes sional when removing the old antenna especially if you have any doubt about clearing overhead wires e Never install an antenna by your self Be sure to have at least two people available for help e Never install an antenna on a windy day 1999 Tandy Corporation All Rights Reserved RadioShack is a registered trademark used by Tandy Corporation o UNS WB on E GIN 21 869 fm Page 2 Wednesday October 13 1999 11 50 AM BEFORE YOU BEGIN Coaxial Cable Installation Precautions When deciding on an antenna s location consider these points e The antenna should be as high as possible on the building The antenna and its cable should be as far as possible from sources of electrical noise such as appliances or other radios The antenna should be vertical for the best performance Do not install coaxial cable where it will have a pulling tension of greater than 50 pounds Leave no tension on the c
9. e 3 Wednesday October 13 1999 11 50 AM PREPARATION Pre Tuning the Antenna Your antenna is preset to use 27 205 MHz the middle of the CB band for the lowest SWR If you are using your anten na with a CB radio you do not have to pre tune it See Assembling and Mount ing the Antenna on Page 3 Before you assemble and mount the an tenna you must determine the frequen cy range you will be using with it If you are not using CB frequencies you must either trim the antenna s top element to match the range you are using or use an antenna tuner not supplied to electri cally trim the antenna Caution To avoid damaging the anten na do not trim the antenna s middle or bottom elements If you are using your antenna with an amateur radio and want to trim the an tenna s top element to pre tune it follow these steps 1 Use the following chart to determine how much you need to trim off of the top element if any 2 28 28 5 29 29 5 30 30 5 31 31 5 32 32 5 33 FREQUENCY MHz For example to pre tune the antenna to use a frequency of 29 328 MHz you must cut off enough of the top element about 21 inches to leave it approximately 51 inches in length o 2 Remove the cap from the top of the top element 3 Use a tape measure to measure the length you need to cut off of the top element then use a hacksaw to carefully cut the top element 4 Replace the cap on the top element
10. e 5 Wednesday October 13 1999 11 50 AM TUNING THE ANTENNA If you are using your antenna at frequen cies in the range of 25 to 30 MHz you can tune the antenna using an standing wave ratio SWR meter not supplied and the dual tuning rings on the bottom element Notes e If you are using your antenna at fre quencies below 25 MHz you will need an antenna tuner not sup plied to tune it The antenna s coaxial cable con nector is the best place to check your antenna s SWR but you can also check it at the radio s coax con nection Follow these steps to tune the antenna 1 Follow the instructions supplied with your SWR meter to adjust your antenna s SWR to the lowest possi ble value SWR values of 2 0 1 are generally acceptable with readings of 1 5 1 or lower being more desirable 2 With the antenna assembled and mounted slowly move the tuning rings up as you check the SWR until you reach your desired fre quency 3 If the center frequency is still too low follow the steps under Pre Tuning the Antenna on Page 3 to shorten the top element by 1 2 inch Then check the SWR again Keep shortening the top element until you reach the desired SWR 4 Using an SWR meter check the SWR at the top and bottom of the band If the SWR is higher at the top of the band than at the bottom raise both tuning rings counterclockwise at increments of 1 4 to 1 2 turns 5 Repeat Step 4 until the S
11. ed for the remainder of the original warranty period You will be charged for repair or replacement of the product made after the expiration of the warranty period This warranty does not cover a damage or failure caused by or attributable to acts of God abuse accident misuse improper or abnormal usage failure to follow instructions improper installation or maintenance alteration lightning or other incidence of excess voltage or current b any repairs other than those provided by a RadioShack Authorized Service Facility c consumables such as fuses or batteries d cosmetic damage e transportation shipping or insurance costs or f costs of product removal installation set up service adjustment or reinstallation This warranty gives you specific legal rights and you may also have other rights which vary from state to state RadioShack Customer Relations 200 Taylor Street 6th Floor Fort Worth TX 76102 We Service What We Sell RadioShack A Division of Tandy Corporation Fort Worth Texas 76102 10A99 Printed in the USA Zl Is
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