Cobra 148 GTL 148GTLE_Eng-Spa - Page 3

I Introduction, II Specifications - mod

Get Cobra 148 GTL PDF manuals and user guides View all Cobra 148 GTL manuals
Add to My Manuals
Save this manual to your list of manuals

Page 3 highlights

Section I Introduction FREQUENCY RANGE The COBRA 148GTL transceiver represents one of the most advanced SSB/AM two-way radios ever designed for use as a Class D station in the Citizens Radio Service. This unit features advanced Phase Lock Loop (PLL) circuitry, which is used in the AM mode and in the upper and lower single sideband modes, providing complete coverage of all 40 channels shown below. Channel Channel Frequency in MHz Channel Channel Frequency in MHz 1 26.965 2 26.975 3 26.985 4 27.005 5 27.015 21 27.215 22 27.225 23 27.255 24 27.235 25 27.245 6 27.025 7 27.035 8 27.055 9 27.065 10 27.075 26 27.265 27 27.275 28 27.285 29 27.295 30 27.305 11 27.085 12 27.105 13 27.115 14 27.125 15 27.135 31 27.315 32 27.325 33 27.335 34 27.345 35 27.355 16 27.155 17 27.165 18 27.175 19 27.185 20 27.205 36 27.365 37 27.375 38 27.385 39 27.395 40 27.405 The COBRA 148GTL has a vastly superior receiver which includes an RF gain control and noise blanker circuitry effective in both AM and SSB modes., and an automatic noise limiter effective in the AM mode. The receiver also features increased protection against cross modulation and strong adjacent channel signals. To obtain maximum performance please read carefully the descriptions and operating instructions in this manual. 2 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, 40 LSB, 40 USB. 26.965 to 27.405 MHz. Phase Lock Loop (PLL) synthesizer. 0.005%. 0.001%. -22° F to +122° F (-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). (6 cm (H) x 20 cm (W) x 23.5 cm (D)). 5 lbs. (2.27 kg). 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. 3

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
Section I Introduction
FREQUENCY RANGE
The COBRA 148GTL transceiver represents one of the most advanced SSB/AM
two-way radios ever designed for use as a Class D station in the Citizens Radio
Service. This unit features advanced Phase Lock Loop (PLL) circuitry, which is used
in the AM mode and in the upper and lower single sideband modes, providing
complete coverage of all 40 channels shown below.
Channel
Channel Frequency
in MHz
1
26.965
2
26.975
3
26.985
4
27.005
5
27.015
6
27.025
7
27.035
8
27.055
9
27.065
10
27.075
11
27.085
12
27.105
13
27.115
14
27.125
15
27.135
16
27.155
17
27.165
18
27.175
19
27.185
Channel
Channel Frequency
in MHz
21
27.215
22
27.225
23
27.255
24
27.235
25
27.245
26
27.265
27
27.275
28
27.285
29
27.295
30
27.305
31
27.315
32
27.325
33
27.335
34
27.345
35
27.355
36
27.365
37
27.375
38
27.385
39
27.395
40
27.405
20
27.205
The COBRA 148GTL has a vastly superior receiver which includes an RF gain
control and noise blanker circuitry effective in both AM and SSB modes., and an
automatic noise limiter effective in the AM mode. The receiver also features
increased protection against cross modulation and strong adjacent channel signals.
To obtain maximum performance please read carefully the descriptions and
operating instructions in this manual.
2
Section II Specifications
GENERAL
Channels
40 AM, 40 LSB, 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
-22° F to +122° F (-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).
(6 cm (H) x 20 cm (W) x 23.5 cm (D)).
Weight
5 lbs. (2.27 kg).
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 and SWR.
Transmit LED glows red when transmitter is in
operation.
3