Cobra Electronics 148 GTL Section II Specifications, General, Transmitter, Receiver, PA System

Section II Specifications

Section II Specifications (Cont.)

GENERAL
Channels	40 AM, 40LSB, 40 USB.
Frequency Range	26.965 to 27.405 MHz.
Frequency Control	Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance	0.005%
Frequency Stability	0.001%
Operating Temperature Range	-30° C to + 50° C
Microphone	Plug-in dynamic; with push-to-talk
	switch and coiled cord.
Input Voltage	13.8V DC nominal, 15.9V max., 11.7V
	min. (positive or negative ground).
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 transistors,
	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.
TRANSMITTER
Power Output	AM, 4 watts.
	SSB, 12 watts, PEP.
Modulation	High-and low-level Class B, Amplitude
	Modulation.
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

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)

PA SYSTEM

Power Output

External Speaker for PA (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 1/2-watt 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.

4 watts into external speaker.

8 ohms.

and SWR. Transmit LED glows red when

transmitter is in operation.

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)

3 4