Owner's Manual

Multi-Function Meter
SWR Meter: Measures SWR (standing wave ratio) of antenna. Use it to
check the antenna system or to adjust your antenna to the proper length.
To measure SWR, complete the following steps on channels 1 & 40:
1. Position meter switch to CAL.
2. Press microphone PTT
switch. (Transmit)
3. Calibrate meter with the
SWR CAL control by adjusting the
needle to the T mark.
4. Move the meter switch to the SWR
position while continuing to press
the microphone PTT switch.
5. Record the number.
SWRCAL
0
S/RF~
SWR
CAL.
S!RF~
SWR~
CAL
When completed, compare your results to the tuning solutions below:
• If SWR on channels 1 & 40 is below 2.0, your radio can be
operated safely.
• If SWR on the lowest channel is higher than it is on the highest
channel, your antenna system is electrically short. Your antenna
length may need to be increased.
NOTE: It is a good idea to put a mark at each setting to reference
how far you have moved and where you started.
• If the SWR on channel 40 is greater than that on channel 1, your
antenna is considered to be "LONG" and reduction of physical
length will correct this situation.
NOTE: Any adjustments should be made in small increments,
i.e. 1 /8".
If after trying the above corrections, and the SWR on all channels is
above 2.0 but not in the "red zone" (over 3), you may be experiencing
coaxial cable . reaction (bad quality, wrong length, etc.), insufficient
ground plane, or have an ungrounded antenna mount.
RoadKing recommends quality coax and antenna brands Wilson, Francis, & K-40.
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