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manual abstract
The electrical noise may come several sources. Many possibilities exist and variations between vehicles require different solutions to reduce the noise. Consult your COBRA dealer or a 2-way radio technician for help in locating and correcting the source of severe noise. Base Station Operation (Operation from 120VAC, House Current) To operate your transceiver from your home or office, using the regular house current as the power source, you will require a 12 VDC power pack that has been specially designed for the purpose. It is available as optional equipment from your COBRA dealer. It consists of a 120-volt, 60 Hz AC to 12-volt DC power converter that delivers the required power for the operation of the transceiver. Simply connect the red (+) and black ( - ) leads of the transceiver to the corresponding terminals of the power packs. DO NOT ATTEMPT TO OPERATE THIS TRANSCEIVER BY CONNECTING DIRECTLY TO 120 VAC. Temporary Mobile Operation To operate your COBRA transceiver from a car on a temporary basis, you may want to purchase an optional cigar lighter adapter from your COBRA dealer. This adapter and a magnetic mount antenna allow you to quickly "install" your transceiver for temporary use. 7 Operation (Cont.) 9 6. DELTA-TUNE. For normal operation, set this control to the center position. This feature has several uses and can greatly enhance receiver operation. If a received signal is slightly off frequency, the Delta-Tune control can be used to Ofine-tuneO your receiver. Fine tuning is accomplished by listening for a more readable signal at the speaker or by noting the Smeter reading when the Delta-Tune control is operated. Another use of this control is eliminating adjacent interference. If an exceptionally high level signal from an adjacent channel is creating interference on the channel being used, the Delta-Tune can be used to minimize or eliminate the interference. Rotate the control until you obtain minimum adjacent channel interference. NOTE: Delta-Tune is operable only in the receive mode. 7. WEATHER CHANNEL SELECTOR. This switch selects any one of the seven U.S. NOAAWeatherband broadcast stations (see p. 1). Always keep set to local NOAA Frequency. See enclosed brochure and card for NOAA travel information. NOTE: The Weather Alert Tone can be turned off by positioning this selector in the off location. 8. SWR CAL. Used to calibrate the meter for SWR (standing wave ratio) measurements. Simply switch to "CAL," press the PTT switch on the microphone and calibrate the meter. 9. CHANNEL SELECTOR SWITCH. This switch selects any one of forty Citizens Band channels desired. The selected channel is indicated by the LED readout (17), directly above the channel selector knob. 10. S/RF/SWR/CAL SWITCH. When in the S/RF position, the meter swings proportionally to the strength of the received signal. When transmitting, the meter indicates relative RF output power. When in the "CAL" position, the SWR meter can be calibrated by adjusting the "SWR CAL" control to the "CAL" mark on the meter face. When in the "SWR" position, the standing wave ratio is measured. 11. NB-ANL/ANL/ OFF SWITCH: When this switch is in the ANL position, only the automatic noise limiter in the audio circuits is activated. When it is in the NB/ANL position, the RF noise blanker also is activated. The RF noise blanker is very effective for repetitive impulse noise, such as ignition interference. 12. PA/CB SWITCH: .Selects the mode of operation. In the CB position, the PA function is disabled and the unit will transmit and receive on the selected frequency. The PA function should not be used unless a PA speaker is connected. In the PA mode, incoming CB transmissions will be heard through the PA speaker. This allows you to monitor messages when you are not inside your vehicle. 13. CB/WX SWITCH. Used for selection between receiving Weatherband broadcasts or normal CB operation. The radio will not transmit in the Weatherband mode. Controls and Indicators Refer to controls, indicators and connectors as illustrated below: A. Front Panel 1. MICROPHONE CONNECTOR. Front panel microphone connector. 2. OFF/ON/VOLUME. Turn clockwise to turn power on and set the desired listening volume. 3. SQUELCH. This control is used to cut off or eliminate receiver background noise in the absence of an incoming signal. For maximum receiver sensitivity it is desired that the control be adjusted only to the point where the receiver background noise or ambient background noise is eliminated. Adjust until the receiver noise disappears. This will require the incoming signal to be slightly stronger than the average receiver noise. Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard. Only strong signals will be heard at a maximum clockwise setting. 4. DYNAMIKE. Adjusts the microphone gain in the transmit and PA modes. This controls the gain to the extent that full talk power is available several inches away from the m...