COBRA 148 GTL CB RADIO
40 CHANNEL CITIZENS BAND SSB/AM 2-WAY MOBILE RADIO
|Cobra 148 GTL Channels 40 AM, 40LSB, 40 USB.
Frequency Range 26.965 to 27.405 MHz.
Frequency Control Phase Lock Loop (PLL)
Frequency Tolerance 0.005%
Frequency Stability 0.001%
Operating Temperature Range -30° C to + 50°
Microphone dynamic; with push-to-talk switch and coiled cord.
Input Voltage 13.8V DC nominal, 15.9V max
Current Drain Transmit: AM full mod., 2.2A. SSB 12 watts PEP output, 2A.
Receive: Squelched, 0.25A
Maximum audio output, 0.6A.
Size 2 3/8”(H) x 7 7/8”(W) x 9 1/4”(D).
Weight 5 lbs.
Antenna Conductor UHF, S0239.
Semiconductors 3 field effect transistors, 45 ransistors, 63 diodes, 6 integrated circuits, 1 two color light emitting diode.
Meter (3-in-1) Illuminated; indicates relative output
power, received signal strength, and SWR.
Uniden Cobra 148GTL TRANSMITTER
Power Output AM, 4 watts. SSB, 12 watts, PEP.
Modulation High-and low-level Class B, Amplitude
Intermodulation Distortion SSB: 3rd order, more than -25 dB. 5th order, more than -35 dB.
SSB Carrier Suppression 55 dB.
Unwanted Sideband 50 dB.
Frequency Response AM and SSB; 300 to 2500 Hz.
Output Impedance 50 ohms, unbalanced
Output Indicators Meter shows relative RF output power and SWR. Transmit LED glows red when
transmitter is in operation.
Cobra 148 GTL RECEIVER
Sensitivity 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 1/2-watt of audio output.
Selectivity AM: 6dB @ 3 KHz, 50 dB @ 9 KHz.
SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz.
Image Rejection More than 65 dB.
IF Frequency AM: 7.8 MHz 1st IF, 455 KHz 2nd IF SSB: 7.8 MHz.
Adjacent-Channel Rejection 60 dB AM & 70 dB SSB.
AM and SSB RF Gain Control 40 dB adjustable for optimum signal reception.
Automatic Gain Control (AGC) Less than 10 dB change in audio output for inputs from 10 to 100,000 microvolts.
Squelch Adjustable; threshold less than 0.25 μV.
Noise Blanker RF type, effective on AM and SSB.
Voice Lock Range ±2.5 KHz.
Audio Output Power 4 watts into 8 ohms.
Frequency Response 300 to 2500 Hz.
Built-in Speaker 4 ohms, round.
External Speaker (Not Supplied) 8 ohms; disables internal speaker when connected.
PA SYSTEM Power Output 4 watts into external speaker.
External Speaker for PA (Not Supplied) 8 ohms.