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Cat. No. 20-006A
Telescoping Antenna for Portable Scanners
and Walkie Talkies
You can use this telescoping antenna for either receiving or transmitting. You can
use it as a receiving antenna from 25 MHz through the 1296 MHz Ham Band, and
you can use it as a 1/4 wavelength transmitting antenna from 130 MHz through 535
MHz.
USING THE ANTENNA FOR TRANSMITTING
For transmitting, you must set the antenna length as close as possible to the trans-
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mitting frequency’s /4 wavelength. This ensures the best possible transmission by
using the proper standing wave ratio (SWR).
Cautions:
• When you use the antenna to transmit, you must always collapse the section
located just above the loading coil. If you do not, you might damage the
antenna and/or your radio.
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• When you use the antenna to transmit, you must calculate the /4 wavelength
and adjust the antenna length accordingly. If you do not do this, you can dam-
age your transmitting equipment due to an improper standing wave ratio
(SWR).
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Use this formula to calculate the proper length for a /4 wavelength transmitting an-
tenna:
2834
Freq. in MHz = Antenna Length in Inches
Example:
2834
147 (MHz) =19.3 Inches
© 1996 Tandy Corporation.
All Rights Reserved.
RadioShack is a trademark used by Tandy Corporation.
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