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Radio Shack 21-534, Owner'S Manual, Page: 10 / 20

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Radio Shack 21-534 Owner'S Manual Download Page 10

10

•

Adjust the length of your antenna according to the instruc-
tions provided by the manufacturer. A change of as little as

1

/

8

 inch can make a measurable difference.

•

See your radio and antenna’s owner’s manuals.

21-534.fm  Page 10  Thursday, August 5, 1999  3:53 PM

Summary of Contents for 21-534

Page 1: ...Cat No 21 534 OWNER S MANUAL Please read before using this equipment CB High Frequency Ham Power SWR Meter 21 534 fm Page 1 Thursday August 5 1999 3 53 PM Downloaded by Amateur Radio Directory ...

Page 2: ...length that produces the maximum transmit power The meter s power meter function measures your radio s peak envelope power PEP or average power Carefully read all of these instructions to get the best use from this meter Warning You can use this meter to make measurements on equipment that uses high voltages Carefully observe all safety precautions provided with the equipment you are test ing Note...

Page 3: ...necting the Meter 4 Calibrating the Meter Measuring SWR 5 Interpreting SWR Readings 8 Improving SWR 9 Measuring Power 11 Care and Maintenance 14 Schematic Diagram 16 Specifications 17 21 534 fm Page 3 Thursday August 5 1999 3 53 PM ...

Page 4: ... of producing For more information about measuring SWR see the ARRL Handbook available at your local library CONNECTING THE METER To connect this meter to your CB or amateur radio and your antenna you need RG 58U coaxial cable not supplied with a PL 259 connector on both ends such as RadioShack Cat No 278 968 The cable must reach from the back of the meter to your radio s antenna jack Follow these...

Page 5: ...to the radio s antenna jack and into TRANSMITTER on the back of the meter CALIBRATING THE METER MEASURING SWR 1 Turn on your radio Then set FUNCTION on the front of the meter to CAL 2 Select a channel or frequency on your transmitter and hold down its transmit key Do not speak into the micro phone 21 534 fm Page 5 Thursday August 5 1999 3 53 PM ...

Page 6: ... you transmit on all 40 CB channels choose Channel 20 because it is midway between Channel 1 and Channel 40 If you use a CB that has sideband modes SSB do not select any of these modes Use only AM for SWR measurements If you have an amateur radio select the continuous wave CW or tuning mode to check the SWR 3 While you hold down the transmit key rotate CALIBRA TION on the front of the meter until ...

Page 7: ...y 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 If your transmitter s power is more than 20 watts read the upper scale marked with an H on its right side 21 534 fm Page 7 Thursday August 5 1999 3 53 PM ...

Page 8: ...to 1 5 Excellent The antenna cable and the antenna length match the transmitter s output require ments almost perfectly 1 5 to 2 0 Very good The antenna the cable and the transmitter operate very efficiently 2 0 to 3 0 Acceptable The antenna the cable and the transmitter operate with some loss If possible adjust your antenna or antenna mounting system to improve Above 3 0 Inefficient Adjust your a...

Page 9: ... several ways to improve the SWR of your radio an tenna combination Try these first Be sure you are using the type of cable recommended for your equipment If the manufacturer recommends a 50 ohm cable do not substitute another type that has a differ ent impedance Confirm that you mounted your antenna according to the manufacturer s instructions The angle and the base arrangement can affect the SWR...

Page 10: ... antenna according to the instruc tions provided by the manufacturer A change of as little as 1 8 inch can make a measurable difference See your radio and antenna s owner s manuals 21 534 fm Page 10 Thursday August 5 1999 3 53 PM ...

Page 11: ...information about measuring power see the ARRL Handbook available at your local library Important To accurately measure power using SSB you must connect a low frequency oscillator not supplied capable of generating a 1000 1500 Hz tone signal to the transmitter This procedure should be performed by a qualified technician Follow these steps to measure your transmitter s power out put 1 Set FUNCTION ...

Page 12: ... is more than 200 watts or you do not know the transmitter s power set RANGE to 2000W 3 Set MODE on the front of the meter to the correct setting for your transmitter If your transmitter uses SSB or CW set MODE to PEP to measure peak envelope power If your transmitter uses another type of output set MODE to AVG to measure average power 21 534 fm Page 12 Thursday August 5 1999 3 53 PM ...

Page 13: ...our transmitter and hold down its transmit key Do not speak into the microphone 5 Read the power level by noting the needle s position on the correct POWER scale If you set RANGE to 20W in Step 2 read the lower scale marked with an L on its right side If you set RANGE to 200W or 2000W in Step 2 read the upper scale marked with an H on its right side Note If the power level is extremely low within ...

Page 14: ...eter gently and carefully Dropping it can damage circuit boards and cases and can cause the meter to work improperly Use and store the meter only in normal temper ature environments Temperature extremes can shorten the life of electronic devices and distort or melt plastic parts Keep the meter away from dust and dirt which can cause premature wear of parts Wipe the meter with a damp cloth occasion...

Page 15: ...ter 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 local RadioShack store for assistance 21 534 fm Page 15 Thursday August 5 1999 3 53 PM ...

Page 16: ...All resistance values are indicated in OHM K 10 3OHM 2 All capacitance values are indicated in mF P 10 6 mF 3 All diodes indicated in 1K100 350 illus show schematic diagram of meter 21 534 fm Page 16 Thursday August 5 1999 3 53 PM ...

Page 17: ...for Calibration 1 Watt Power Meter Accuracy at 50 Ohms load impedance 5 Watts 0 5 Watt 50 Watts 5 Watts 500 Watts 50 Watts Dimensions HWD 217 32 615 32 41 16 Inches 64 165 102 mm Weight 10 9 oz 310 g Specifications are typical individual units might vary Specifica tions are subject to change and improvement without notice 21 534 fm Page 17 Thursday August 5 1999 3 53 PM Downloaded by Amateur Radio...

Page 18: ...18 NOTES 21 534 fm Page 18 Thursday August 5 1999 3 53 PM ...

Page 19: ...CIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of incidental or consequential damages so the above limita tions or exclusions may not apply to you In the event of a product defect during the warranty period take the product and the RadioShack sal...

Page 20: ...ltage or current b any repairs other than those provided by a RadioShack Authorized Service Facility c consum ables such as fuses or batteries d cosmetic damage e transportation ship ping 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 ...

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