Cobra Electronics 148 NW ST specifications Calibrate For SWR Standing Wave Ratio

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148 NW ST manual 3.3 6/15/99 3:12 PM Page 18

Operation

Operation

Calibrate For

SWR (Standing

Wave Ratio)

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.

Calibrate for SWR (Standing Wave Ratio)

1Select channel 20.

4

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.

5

Repeat the same steps on Channel 1 and 40.

6

Continue holding the mic button and turn the

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

2Switch to theCAL position.

SWR CAL knob to the SWR position for SWR

measurement.

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.

3Push and hold mic button.

 

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19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents How to Use Your Cobra 148 NW ST Features of This ProductMounting and Connection InstallationLocationLocation Mounting and ConnectionNW ST manual 3.3 6/15/99 312 PM CB Antenna Marine InstallationAntennas Ignition Noise Interference CB AntennaTurning On Setting ChannelOperation SelectorSoundTrackerTM System MeterS-MeterTo Receive How SoundTrackerTM WorksSoundTracker OFF Noise Blanker Automatic Noise Limiter SwitchActivating Hi/Low/ ToneRF Gain Control USB/AM/LSB SwitchDimmer Control Dimmer Control RF Gain ControlGate set to Desired Squelch Setting DSS Setting Squelch Setting SquelchSquelch is the control gate for incoming signals Gate closedCalibrate For SWR Standing Wave Ratio Calibrate for SWR Standing Wave RatioTransmit TransmitRF Meter Address External Speaker External SpeakerPA Public PA Public AddressBase Station Operation From 120V AC House Current Base Station Operation From 120V AC House CurrentFew Rules You Should Know Temporary Mobile Set-Up How Your CB Can Serve YouTemporary Mobile Set-Up Channel Emergency MessagesPermitted Example Message CB 10-CodesFrequency Ranges NW ST Specifications Limited One Year Warranty Cobra Electronics CorporationOptional Accessories Order by mail or faxAmount Shipping Order Handling Accessory Order FormShipping & Handling Item #If you think you need service call If You Think You Need ServiceAm 800 pm,Monday through Friday, CST FCC Warnings CB StoryFCC Regulations What’s Included with Your 148 NW STControls and Indicators Our Thanks to You SoundTrackerTMNW ST manual 3.3 6/15/99 312 PM
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