A citizens band radio (CB) is a communication device that allows people to broadcast and receive messages over a range of approximately 20 miles. The CB radio needs an aerial to be connected, and a tuning procedure is needed for these devices to work. The tuning procedure can be carried out with a Micronta field strength/SWR tester, which measures the ratio of transmitted signal to that of reflected signal. A standing wave ratio of 1 means perfect transmission, whereas anything above 1 means part of the radio wave is being reflected.
- Connect the provided small antenna to the Micronta field strength/SWR tester.
- Connect the CB radio directly to an aerial.
- Transmit, and adjust the calibration knob so the meter reads 2 to 4 on the “FS” scale.
- The antenna can now be tuned by varying its length and measuring the field strength directly during transmission.
