User manual COBRA 2000GTL BASE STATION

[. . . ] REFER TO SERVICING TO QUALIFIED SERVICE PERSONNEL. Features -341 Operating Frequencies Allows operation on all available frequencies. 30 Watts Output Power Provides maximum power on AM and FM 100 PEP SSB. All Mode Operation · Continuous wave · Frequency or amplitude modulation · Upper or lower sideband. SWR Calibration Allows measurement and adjustment of the antenna system. [. . . ] -SWR CAL This control is used in conjunction with the DIM / SWR CAL button to calibrate the standing wave ratio circuit to full scale on the display meter in preparation for measuring the standing wave ratio that the antenna is presenting to the transceiver. The standing wave ratio can be checked to insure that maximum power is being radiated for the longest signal range. The antenna must be in good condition, properly adjusted and matched to your transceiver. The SWR function of the display meter lets you easily measure your antenna condition. To operate this function, select a frequency near the middle of the range such as 28. 850 MHz or the one you plan to use most. Press and hold the microphone Press-To-Talk button and, using the SWR CAL knob, adjust the meter to the CAL position indicated on the display meter. Press the SWR / S/RF to the in position and again press and hold the microphone Press-To-Talk button and read the SWR indicated. Generally, readings up to 3 are acceptable, but a reading greater than 3 indicates that you are losing radiated power and antenna adjustment may be advisable. -- Controls NB / ANL When this button is in the ANL (in) position, only the automatic noise limiter in the audio circuits is activated. When the button is in the NB/ANL (out) position, the RF noise blanker also is activated. The RF noise blanker is very effective for repetitive impulse noise such as ignition interference. If there is any degradation in these, due to humidity, salt, spray, vibration or corrosion, the SWR meter reading will rise, thereby indicating that a problem exists. --RX / TX Indicator This indicator glows green when in receive mode and red when in transmit mode. Antenna Indicator This indicator glows red whenever the standing wave ratio is greater than 3 to 1. Be sure the power source, microphone and antenna are properly connected. Turn the unit on by turning the volume knob clockwise and set the volume for a comfortable listening level. Listen to the background noise from the speaker, then turn the squelch ring slowly clockwise until the noise just disappears (no signal should be present). Do not advance the control too far, or some of the weaker signals will not be heard. Select the desired frequency with the band and frequency selector knobs. Adjust other controls as desired. Microphone · The receive and transmit modes are controlled by the Press-To-Talk (PTT) switch on the microphone. When transmitting, hold the microphone two inches from the mouth and speak clearly in a normal voice. To substitute for the supplied low-impedance (500 ohm) dynamic microphone, see the alternate microphones and installation section on page 17. Operating to Transmit To transmit a signal: 1. [. . . ] This warranty gives you specific legal rights, and you may also have other rights which may vary from state to state. Exclusions: This limited warranty does not apply: 1) To any product damaged by accident; 2) In the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs; 3) If the serial number has been altered, defaced or removed; 4) If the owner of the product resides outside the U. S. A. All implied warranties, including warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this warranty. Cobra shall not be liable for any incidental, consequential or other damages; including, without limitation, damages resulting from loss of use or cost of installation. [. . . ]