Operation

Operation

 

 

Calibrate For

SWR (Standing

Wave Ratio)

Calibrate for SWR (Standing Wave Ratio)

SWR calibration is done to properly 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 opti- mum performance.

29 NW ST

N B /

C B

H I

TONE C H 1 9

A N L

R X / T X

 

 

A N L

 

 

C H 9

O F F

P A

N O R

N O R

E

R F G A I N

D I M M E R

 

 

 

S W R C A L

A X M I N

M A X M I N

M A X

1Select channel 20.

 

 

 

 

 

 

 

29 NW ST

 

SWR

2

3

 

CAL

S / R F

 

N B /

C B

 

RF

 

 

 

 

 

 

A N L

 

 

 

 

 

 

 

 

 

 

 

 

 

S W R

 

A N L

 

 

SIG 1

3

5

7 9

+30dB

 

 

 

 

 

 

P A

 

 

 

 

 

 

C A L

 

O F F

 

 

 

 

 

 

 

 

 

 

 

V O L

S Q L

D Y N A M I K E

 

R F G A I N

 

 

 

O F F

 

 

M I N

M A X M I N

M A X

2 Switch to the

CAL position.

 

 

PUSH &

HOLD

3Push and hold mic button.

29 NW ST

 

 

N B /

C B

TONE

C H 1 9

A N L

H I

R X / T X

 

 

A N L

 

 

C H 9

O F F

P A

N O R

N O R

E

R F G A I N

D I M M E R

 

 

 

S W R C A L

M A X M I N

M A X M I N

M A X

4While holding mic

button adjust the

 

SWR

2

3

 

 

 

CAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWR CAL knob so the

 

 

 

RF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

meter needle swings

SIG 1

3

5

7 9

+30dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to the CAL ▼ mark on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the meter (located on the right).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

continued

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.

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Cobra Electronics Cobra 29 NW ST Calibrate For SWR Standing Wave Ratio, Calibrate for SWR Standing Wave Ratio