Cobra Electronics 2010 GTL WX operating instructions Section IV Operation

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Section IV Operation (Continued)

6.SWR CAL CONTROL . In order for you to achieve maximum radiated power and the longest range, it is important that your antenna be in good condition, properly adjusted and matched to your transceiver. The Built-in SWR (standing wave ratio) meter lets you easily measure your antenna condition. To operate this function, connect your antenna to the transceiver antenna output connector. Select a channel near the middle of the band such as 21 or the channel you plan to use most frequently. Turn the power on, set mode switch to AM, and set the meter function switch to the CAL position. Press and hold the microphone push- to-talk button and using the SWR CAL control, adjust the meter to read the CAL position indicated on the meter face. Then, without releasing the microphone button, switch the meter function switch to the SWR position and read the SWR indicated. The lower the figure, the better, with 1 being ideal. Generally speaking, readings up to 3 are acceptable, but over 3 indicates that you are losing radiated power and antenna adjustment may be advisable. This feature cannot be used in Weather Mode.

7.VOICE LOCK FINE/COURSE. Allows variation of the receiver operating fre- quencies above and below the assigned frequency. Although this control is intended primarily to tune in SSB signals, it may also be used to optimize AM signals. This feature cannot be used in the Weather Mode.

8.MODE SWITCH (USB/LSB/AM). This switch selects AM (Amplitutde Modula- tion), USB (Upper Side Band) or LSB ( Lower Side Band) mode of operation. The Mode selector switch changes the mode of operation of both the transmitter and receiver simultaneously. This feature cannot be used in the Weather Mode.

9.CHANNEL SELECTOR. In the CB Mode, this electronic selector selects any one of the forty Citizens Band channels desired. The selected channel appears on the LCD readout directly above the Channel Selector knob. In WX Mode, any one of the 7 Weather Channels will be selected.

10.INSTANT CHANNEL 9 BUTTON. Use to activate Emergency Channel 9 instantly.

11.ANL SWITCH. In the ANL position, the noise reduction circuits of the Automatic Noise Limiter are activated. This feature cannot be used in the Weather Mode.

12.NB SWITCH. When this switch is placed in the NB position the RF noise blanker is activated. The RF noise blanker is very effective for repetitive impulse noise such as ignition interference. This feature cannot be used in the Weather Mode.

13.WX/CB SWITCH. Selects the mode of operation. In the CB position, the WX function is placed in Alert mode and the unit will transmit and receive on the selected CB frequency. In the WX position, select one of 7 Weather Channels for continous WX monitoring.

Note: Clock is displayed when in Weather Mode.

14.SWR/SWR CAL/MOD SELECTOR. In the MOD position, the MOD meter is activated. When in the SWR or SWR CAL positions the SWR meter is activated. This feature cannot be used in Weather Mode. In USB or LSB mode, the MOD meter does not operate.

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Contents Solid State Citizens Band SSB/AM TWO-WAY Radio Base Station Cobra What Is Weather Radio? NWR Frequencies and Transmission CharacteristicsCB Story Section I Introduction Frequency RangeChannel MHz Section II Specifications GeneralTransmitter Receiver CLOCK/COUNTER Weather WX Receiver Mobile OPERATION/EMERGENCY Power Operation Section III InstallationLocation Base Station AntennaControl Functions Controls and IndicatorsSection IV Operation Section IV Operation ANT Indicator FunctionsOperating Procedure to Receive Operating Procedure to TransmitOperating Procedure to Receive Weather Band Frequency COUNTER/LCD Digital Clock To SET TimeFREQ. CTR./CLOCK Receiving SSB Signals Receiving SSB Signals FCC Warning Section V Maintenance and AdjustmentSection VI Appendix CodeCode Meaning HOW Your CB can Serve YOU FEW Rules That should be ObeyedPermitted Example Message USE Channel 9 for Emergency Messages onlyWire MIC Cable Alternate Microphones and InstallationSection VI Appendix Section VI Appendix If You Need Service If You Think You Need Service, CallHours a day, 7 days a week Warranty Cobra CB Radio Accessories Cobra
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