Cobra Electronics HH36ST Section I Introduction, Section II Specifications, Frequency Range

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	Channel	Channel Frequency
	in MHz		in MHz
1	26.965	21	27.215
2	26.975	22	27.225
3	26.985	23	27.255
4	27.005	24	27.235
5	27.015	25	27.245
6	27.025	26	27.265
7	27.035	27	27.275
8	27.055	28	27.285
9	27.065	29	27.295
10	27.075	30	27.305
11	27.085	31	27.315
12	27.105	32	27.325
13	27.115	33	27.335
14	27.125	34	27.345
15	27.135	35	27.355
16	27.155	36	27.365
17	27.165	37	27.375
18	27.175	38	27.385
19	27.185	39	27.395
20	27.205	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.

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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/	”(W) x 9	1/ ”(D).
				8	4
	(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.

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