21-533.fm Page 15 Thursday, August 5, 1999 3:47 PM

If you have an amateur radio, select the continuous wave (CW) or tuning mode to check the field strength.

4.To measure field strength, as the helper continues to hold down the transmit key, move to the marked spot on the circle due north of the antenna, then watch the meter’s needle.

Note the reading on the FIELD STRENGTH scale and place a dot on the template on Page 11 corresponding to the reading at that point.

In this example, the needle shows a 4 on the FIELD STRENGTH scale. Place a dot where the spoke repre- sentating the path you walked from the center of the circle intersects the circle marked with a 4 on the template.

Direction of Travel

 

 

Dot

 

 

You are Here

 

 

 

 

 

 

 

 

 

 

 

 

 

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Radio Shack 21-533 owner manual Dot