7
USING FIELD STRENGTH READINGS TO TUNE YOUR RADIO AND
ANTENNA
You can use field strength measurements to monitor the effectiveness of
changes you make to your radio and antenna while you make them.
Changes you might make include:
·
Installing a new antenna or antenna cable
·
Adjusting the length of an antenna Changing the antenna mount on
your vehicle
·
Adjusting your radio’s transmitter
You do not need to connect the meter to the antenna or the radio to measure
field strength, but you will need two people. While someone presses the radio
transmit key, you will need to note the readings you see on the meter.
While the helper holds down the transmit key, walk around and adjust the
meter’s knob until the meter’s needle moves to 3 on the FIELD STRENGTH
scale.
Have the helper release the transmit key, then make a change to your radio or
antenna (such as adjusting the antenna or transmitter or adding a new
antenna).
When the change is completed, have the helper hold down the transmit key
again while you watch the meter’s needle.
If the field strength reading is higher, you have probably improved the power
output and efficiency of your radio and antenna.
Note: If you move the physical location, or change the transmission direction,
of your antenna, you might have to recalibrate the meter and measure the
field strength again. See “Calibrating the Meter/Measuring Field Strength”