Radio Shack 10M User Manual

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Cat. No. 21-869  
10M Ham/CB Base Antenna  
Your RadioShack 10M Ham/CB Base  
IMPORTANT SAFETY  
PRECAUTIONS  
Antenna provides excellent reception of  
amateur radio, CB, and commercial radio  
signals. The antenna can handle up to  
2000 watts of transmit power.  
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 always results in a very serious  
shock.  
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.  
To avoid electric shock, please read and  
follow these important safety precautions:  
Three Easy-to-Assemble Sections —  
help you quickly and easily assemble the  
antenna.  
• Be sure to select an antenna site  
well away from all overhead wires.  
Dual Tuning Rings — help you quickly  
set the antenna for optimum perfor-  
mance over a wide range of frequencies.  
• Do not try to guess which overhead  
wires carry high voltage. Check with  
the power company.  
Ultraviolet Inhibitor — the antenna’s  
UV-protected housing is made of impact-  
resistant fiberglass, making the exterior  
resistant to weathering and color change.  
• 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.  
Strong Internal Construction — pre-  
vents the antenna’s internal wires from  
rattling, for maximum strength.  
• Get help from a qualified profes-  
sional when removing the old  
antenna, especially if you have any  
doubt about clearing overhead  
wires.  
• Never install an antenna by your-  
self. Be sure to have at least two  
people available for help.  
• Never install an antenna on a windy  
day.  
© 1999 Tandy Corporation.  
All Rights Reserved.  
RadioShack is a registered trademark used by Tandy Corporation.  
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2. Remove the cap from the top of the  
top element.  
PREPARATION  
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.  
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.  
4. Replace the cap on the top element.  
5. Set the tuning rings on the bottom  
element of the antenna to their low-  
est position.  
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.  
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).  
Caution: To avoid damaging the anten-  
na, do not trim the antenna’s middle or  
bottom elements.  
Assembling and Mounting  
the Antenna  
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.  
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.)  
1. Use the following chart to determine  
how much you need to trim off of the  
top element (if any).  
Important:  
• 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.  
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.  
3
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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 3 -inch lock washer (2) over the threaded end  
/8  
of the top element (1).  
3. Insert the threaded end of the top element into the threads on the  
center element (3), screw the top element into the center ele-  
ment, then use a 1 -inch wrench to tighten it.  
/2  
4. Place the supplied 1 -inch lock washer (4) over the threaded end  
/2  
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.  
6. 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.  
7. 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.  
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-  
nector on the bottom of the bottom element. Then route the cable  
to your radio and connect it to the antenna jack on the back of  
the radio.  
Important: Your antenna is designed to let excess moisture escape  
from inside the bottom element. Do not use a silicone sealant or  
caulking material around any part of your antenna to seal it. Other-  
wise, the antenna might not work properly.  
4
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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  
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.  
1/2  
turns.  
at increments of 1 to  
/4  
5. Repeat Step 4 until the SWR is as  
low as possible at both ends of the  
band.  
Notes:  
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.  
• 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.  
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.  
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  
1/2  
shorten the top element by  
inch.  
Then check the SWR again. Keep  
shortening the top element until you  
reach the desired SWR.  
5
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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.  
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.  
6
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SPECIFICATIONS  
Reception ....................................................... VHF and UHF (Pre-tuned for 27.205 MHz)  
Half-Wave Gain ....................................................................................................... 9.9 dBi  
Optimum SWR Range ............................................................................... Less than 1.5:1  
Height (assembled) .............................................................................................. 17.5 feet  
(5.3 m)  
Maximum Diameter ........................................................................................... 1.8 inches  
34 mm.)  
Weight .............................................................................................................. 4 lbs 15 oz  
(2.24 kg)  
Specifications are typical; individual units might vary. Specifications are subject to change  
and improvement without notice.  
7
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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 DURATION 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 warranted 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  
04/99  
We Service What We Sell  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
10A99  
Printed in the USA  

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