Related Manuals for Radio Shack 21-534
Summary of Contents for Radio Shack 21-534
- Page 1 21-534.fm Page 1 Thursday, August 5, 1999 3:53 PM Cat. No. 21-534 OWNER’S MANUAL Please read before using this equipment. CB/High-Frequency Ham Power SWR Meter Downloaded by Amateur Radio Directory...
- Page 2 21-534.fm Page 2 Thursday, August 5, 1999 3:53 PM INTRODUCTION Your RadioShack CB/High-Frequency Ham Power SWR Meter helps you tune your CB or amateur radio system for the best performance. CB and amateur radio systems work best when the antenna system’s impedance closely matches the transmitter’s out-...
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Page 3: Table Of Contents
21-534.fm Page 3 Thursday, August 5, 1999 3:53 PM CONTENTS Measuring SWR ....... . . 4 Connecting the Meter . -
Page 4: Measuring Swr
21-534.fm Page 4 Thursday, August 5, 1999 3:53 PM MEASURING SWR Measuring SWR shows you how much of your radio’s transmit power is reflected from the antenna back into the antenna ca- ble, generating heat and wasting power. With this information,... -
Page 5: Calibrating The Meter/Measuring Swr
21-534.fm Page 5 Thursday, August 5, 1999 3:53 PM 1. Turn off your radio. Then disconnect the antenna from the radio and plug it into on the back of the ANTENNA meter. 2. Plug the coaxial cable into the radio’s antenna jack and into on the back of the meter. - Page 6 21-534.fm Page 6 Thursday, August 5, 1999 3:53 PM Notes: • An SWR reading will be different for different frequen- cies (channels). If you transmit on one channel more often than any other, select that channel. If you trans- mit on several channels, choose a frequency in the middle of the range of channels you use.
- Page 7 21-534.fm Page 7 Thursday, August 5, 1999 3:53 PM 4. Release the transmit key, then set FUNCTION 5. Press the transmit key again, then find the SWR by read- ing the appropriate scale on the meter. • If your transmitter’s power is less than 20 watts, read the lower scale (marked with an L on its right side) •...
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Page 8: Interpreting Swr Readings
21-534.fm Page 8 Thursday, August 5, 1999 3:53 PM INTERPRETING SWR READINGS An ideal SWR reading is 1.0, but this reading is usually possi- ble only under laboratory conditions or with a dummy load. Ac- tual antenna installations have higher readings. The in- formation below will help you interpret the readings you get. -
Page 9: Improving Swr
21-534.fm Page 9 Thursday, August 5, 1999 3:53 PM When you measure SWR, use this chart to determine the per- centage of power that is wasted through reflection of the signal back to the radio. Ref. 0.22 11.1 18.4 25.0 Power For example, an SWR reading of 1.5 also means that 4% of... - Page 10 21-534.fm Page 10 Thursday, August 5, 1999 3:53 PM • Adjust the length of your antenna according to the instruc- tions provided by the manufacturer. A change of as little as inch can make a measurable difference. • See your radio and antenna’s owner’s manuals.
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Page 11: Measuring Power
21-534.fm Page 11 Thursday, August 5, 1999 3:53 PM MEASURING POWER You can use your meter to show how much power your radio is transmitting. You can use this information with the SWR reading (see “Measuring SWR” on Page 4) to determine the... - Page 12 21-534.fm Page 12 Thursday, August 5, 1999 3:53 PM • If your transmitter’s power is 20 watts or less, set RANGE • If your transmitter’s power is more than 20 watts but 200 watts or less, set RANGE 200W • If your transmitter’s power is more than 200 watts, or you do not know the transmitter’s power, set...
- Page 13 21-534.fm Page 13 Thursday, August 5, 1999 3:53 PM 4. If your transmitter does not use SSB, select a channel or frequency on your transmitter and hold down its transmit key. Do not speak into the microphone. If your transmitter uses SSB, input a 1000–1500 Hz tone signal from the low-frequency oscillator you connected to the transmitter.
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Page 14: Care And Maintenance
21-534.fm Page 14 Thursday, August 5, 1999 3:53 PM CARE AND MAINTENANCE Your RadioShack CB/High-Frequency Ham Power SWR Meter is an example of superior design and craftsmanship. The following suggestions will help you care for your meter so you can enjoy it for years. - Page 15 21-534.fm Page 15 Thursday, August 5, 1999 3:53 PM Modifying or tampering with your meter’s internal components can cause a malfunction and might invalidate the meter’s war- ranty. If your meter is not operating as it should, take it to your...
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Page 16: Schematic Diagram
21-534.fm Page 16 Thursday, August 5, 1999 3:53 PM SCHEMATIC DIAGRAM (illus - show schematic diagram of meter) Notes: 1. All resistance values are indicated in “OHM” (K=10 OHM). 2. All capacitance values are indicated in “ F” (P=10 3. All diodes (... -
Page 17: Specifications
21-534.fm Page 17 Thursday, August 5, 1999 3:53 PM SPECIFICATIONS Measurable RF Power ........1–2000 Watts SWR: at 25 Ohms load impedance ........2.0 at 50 Ohms load impedance ........1.1 at 100 Ohms load impedance ........2.0 Impedance ..............50 Ohms Frequency Range ........... - Page 18 21-534.fm Page 18 Thursday, August 5, 1999 3:53 PM NOTES...
- Page 19 21-534.fm Page 19 Thursday, August 5, 1999 3:53 PM Limited Ninety-Day Warranty This product is warranted by RadioShack against manufacturing defects in ma- terial and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack company-owned stores and authorized Ra- dioShack franchisees and dealers.
- Page 20 21-534.fm Page 20 Thursday, August 5, 1999 3:53 PM (continued) This warranty does not cover: (a) damage or failure caused by or at- tributable 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;...
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