Cobra 148 GTL 148GTLE_Eng-Spa - Page 4

Section II Specifications (Cont.) RECEIVER Sensitivity Selectivity Image Rejection IF Frequency Adjacent-Channel Rejection AM and SSB RF Gain Control Automatic Gain Control (AGC) Squelch ANL Noise Blanker Voice Lock Range Audio Output Power Frequency Response Built-in Speaker External Speaker (Not Supplied) SSB: 0.25 µV for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 µV for 10 dB (S+N)/ at greater than 1/2watt of audio output. AM: 6dB @ 3 KHz, 50 dB @ 9 KHz. SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz. More than 65 dB. AM: 7.8 MHz 1st IF, 455 KHz 2nd IF. SSB: 7.8 MHz. 60 dB AM & 70 dB SSB. 40 dB adjustable for optimum signal reception. Less than 10 dB change in audio output for inputs from 10 to 100,000 microvolts. Adjustable; threshold less than 0.25 µV. Switchable. RF type, effective on AM and SSB. ±2.5 KHz. 4 watts into 8 ohms. 300 to 2500 Hz. 4 ohms, round. 8 ohms; disables internal speaker when connected. PA SYSTEM Power Output External Speaker for PA (Not Supplied) 4 watts into external speaker. 8 ohms. Section III Installation LOCATION Plan the location of the transceiver and microphone bracket before starting the installation. Select a location that is convenient for operation and does not interfere with the driver or passengers in the vehicle. In automobiles, the transceiver is usually mounted below the dash panel, with the microphone bracket beside it. MOUNTING THE CONNECTION The COBRA 148GTL is supplied with a universal mounting bracket. When mounting the bracket and radio to your car, make sure it is mechanically strong. Also provide a good electrical connection to the chassis of the vehicle. Proceed as follows to mount the transceiver: 1. After you have determined the most convenient location in your vehicle, hold the COBRA 148GTL with mounting bracket in the exact location desired. If nothing will interfere with mounting it in the desired position, remove the mounting bolts. Before drilling the holes, make sure nothing will interfere with the installation of the mounting bolts. 2. Connect the antenna cable plug to the standard receptacle on the rear panel. Most CB antennas are terminated with a type PL-259 plug and mate with the receptacle. 3. Connect the red DC power input wire (with the fuse) to +13.8V DC. This wire extends from the rear panel. In automobile installation, +13.8V DC is usually obtained from the accessory contact on the ignition switch. This prevents the set being left on accidentally when the driver leaves the car and also permits operating the unit without the engine running. Locate the accessory contact on most ignition switches by tracing the power wire from the AM broadcast receiver in the car. 4. Connect the black lead to -13.8V DC. This is usually the chassis of the car. Any convenient location with good electrical contact (remove paint) may be used. 5. Mount the microphone bracket on either side of the transceiver, using the two screws supplied. When mounting in an automobile, place the bracket under the dash so the microphone is readily accessible. (SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE) 4 5