SWR INFORMATION
1. Choose a clear location to adjust the SWR
Antennas are very sensitive to objects close to them. Go to an open area to tune your antenna,
such as a parking lot. This can be done at home, providing you are not close to the house. Do
not try to tune inside a building, under trees, near or under power lines, nor with someone
standing next to the antenna. This distorts the signal and causes a reflection back into the
antenna giving false readings. Also, close all doors, the hood and trunk lid.
2. Setting the SWR
1. Test with the radio only. If you have an amplifier, either turn it off, or preferably remove
from installation.
2. Insert the antenna whip 1” into the chrome antenna adjustment mast at the top of the
coil.
3. Using either the meter built into the radio or a good external SWR meter, calibrate on
channel 20. Switch back to SWR and record the readings on three channels 1, 20, & 40.
4. If the lowest SWR reading occurs on channel 1, the antenna whip is to long and must be
shortened. Loosen the mast set screws and lower the whip 1/4” into the mast
5. Tighten the mast set screw and again read SWR. Repeat until the lowest SWR is obtained.
6. If the whip is fully lowered into mast and the SWR is still high, remove the whip from
mast. Using a hacksaw, grinder, or bolt cutters, cut 1/4" from the bottom part of the
whip. Re-insert the whip into the mast and test again for SWR. Repeat the above
procedure until the SWR is below 1.5 for all channels.
7. If the lowest SWR reading occurs on channel 40, the antenna whip is to short and must
be raised. Loosen the mast set screws and raise the whip 1/4, re-tighten set screws and
test SWR again.
8.
Repeat the above procedure until the SWR is below 1.5 for all channels.
For Sales Information Please Contact RoadTrucker Inc (www.RoadTrucker.com)
8312 Sidbury Rd.; Wilmington, NC 28411 - (800) 507-0482 / (910) 686-4281
