Section Ii Specifications - Cobra 148 GTL Operating Instructions Manual

Section II Specifications

GENERAL
Channels
Frequency Range
Frequency Control
Frequency Tolerance
Frequency Stability
Operating Temperature Range
Microphone
Input Voltage
Current Drain
Size
Weight
Antenna Conductor
Semiconductors
Meter (3-in-1)
TRANSMITTER
Power Output
Modulation
Intermodulation Distortion
SSB Carrier Suppression
Unwanted Sideband
Frequency Response
Output Impedance
Output Indicators
40 AM, 40LSB, 40 USB.
26.965 to 27.405 MHz.
Phase Lock Loop (PLL) synthesizer.
0.005%
0.001%
-30° C to + 50° C
Plug-in dynamic; with push-to-talk
switch and coiled cord.
13.8V DC nominal, 15.9V max., 11.7V
min. (positive or negative ground).
Transmit : AM full mod., 2.2A. SSB 12
watts PEP output, 2A.
Receive : Squelched, 0.25A
Maximum audio output, 0.6A.
2 3 / 8 "(H) x 7 7 / 8 "(W) x 9 1 / 4 "(D).
5 lbs.
UHF, S0239.
3 field effect transistors, 45 transistors,
63 diodes, 6 integrated circuits, 1 two
color light emitting diode.
Illuminated; indicates relative output
power, received signal strength,
and SWR.
AM, 4 watts.
SSB, 12 watts, PEP.
High-and low-level Class B, Amplitude
Modulation.
SSB: 3rd order, more than -25 dB.
5th order, more than -35 dB.
55 dB.
50 dB.
AM and SSB; 300 to 2500 Hz.
50 ohms, unbalanced
Meter shows relative RF output power
and SWR. Transmit LED glows red when
transmitter is in operation.
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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)
PA SYSTEM
Power Output
External Speaker for PA (Not Supplied)
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
SSB: 0.25 µ V for 10dB (S+N)/N at greater
than 1/2-watt of audio output.
AM: 0.5 µ V 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.
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