Cobra Electronics 148 NW ST - Manual (Page 10)

While holding mic
button adjust the
SWR CAL knob so the
meter needle swings
to the CAL ▼ mark on
the meter (located on the right). If optimum
signal is not achieved (less than 3) a slight
adjustment to the length of the antenna must
be made. Recalibrate.
Repeat the same steps on Channel 1 and 40.
Continue holding the mic button and turn the
SWR CAL knob to the SWR position for SWR
measurement.
Operation Operation
Calibrate For
SWR (Standing
Wave Ratio)
19 18
Note
Calibration must be made in an
open area (never in a garage).
Vehicle doors must be closed. No
one should be standing near the
antenna.(See your antenna
directions for more complete
information).
Note
The reading will be slightly high-
er on Channels 1 and 40 com-
pared to Channel 20.
Note
When switched to SWR position
the meter needle should ideall y
be as far to the left as possible .
Anything over 3 is not accept-
able. A slight antenna height
adjustment (higher or lower)
may be required. Repeat recali-
bration step.
Note
SWR calibration is done to prop-
erly adjust the length of the
antenna and to monitor the
quality of the coaxial cable and
all RF connections.
This calibration is critical in
order to achieve optimum per-
formance.
Push and hold mic button.
Switch to the CAL position. 2
1
3
Calibrate for SWR (Standing Wave Ratio)
Select channel 20.
4
5
6
148 NW ST manual 3.3 6/15/99 3:12 PM Page 18