Cobra 148 GTL ST Specifications download pdf (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.

OperationOperation

Calibrate For

SWR (Standing

Wave Ratio)

1918

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 ideally

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

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