TECHNICAL MATERIEL CORPORATION GPT-10K

GENERAL DESCRIPTION

GENERAL PURPOSE TRANSMITTER MODEL GPT-10K

photo Technical Materiel Corporation GPT-10K

Purpose and description

General Purpose Transmitter, Model GPT-10K is a synthesized transmitter having several modes of operation (SSB, ISB, AM, AM equivalent, CW, FSK, and FAX) in a frequency range of 2 to 28 megacycles. The output of the transmitter is 10 kilowatts (kw) peak envelope power (PEP). The GPT-10K can be subdivided into two stages: (1) a synthesized exciter; (2) a 10-kw linear power amplifier.

The two stages of the transmitter are housed in two frame assemblies; each can be conveniently indentified, (from left to right), as the auxiliary frame and the main frame. The auxiliary frame contains the exciter; the main frame contains the 10-kw power amplifier and its associated power supply and control circuits. A more detailed subdivision of the transmitter is made by assigning formal nomenclature and part numbers, common names are used, and a definite series of symbol numbers is assigned to each assembly. For example, components in the 10-kw high-voltage rectifier are assigned symbol numbers in the 600 series, so that high-voltage rectifier tube V600 is installed in the high-voltage rectifier (symbol series 600), which is then installed in the main frame (symbol series 1000).

Technical characteristics for the GPT-10K transmitter are listed below. Data presented covers functional and environmental characteristics.

General purpose hi-power transmitter

The TMC Model GPT-10K, Radio Transmitter, is a conservatively rated, general purpose unit capable of providing 10 kw PEP output throughout the range 4 to 28 megacycles.

All power amplifier stages are linear and the final is a ceramic tube for increased efficiency and reliability.

Containing all components within a single attractive enclosure, the GPT-10K includes all excitation equipment, V.F.O., spectrum analyzer, F.S. Exciter, and complete "on the air" testing circuitry.

TECHNICAL SPECIFICATIONS
Frequency range	2 to 28 megacycles
Modes of operation	SSB, ISB, AM, AM equivalent, CW, FSK, and FAX
Output power	Normal : 10,000 watts peak envelope power (PEP) Emergency : 1,000 watts
Output impedance Unbalanced Balanced	Pi-L network matches load with voltage standing wave ratio (VSWR) of 2:1 maximum 50 or 70 ohms 600 ohms
Tuning	Synthesized frequency control with 100 cycles per second (cps) incremental front panel tunign through the entire frequency range
Stability and accuracy	1 part in 10⁸ per day for ambient temperature change of 15°C (59°F) within the range of 0° to 50°C (32° to 122°F)
Unwanted sideband rejection	500 cps single tone 60 db down from full PEP output
Spurious signals	At least 60 db below full PEP output
Carrier insertion	-55 db to full PEP output
Audio response	CBE crystal lattice filters flat within +1.5 db, 250 to 7500 cps
Audio inputs	600 ohms balanced -20 to +10 dbm continuously adjustable to full PEP output. An unbalanced input can also be applied
Heat dissipation	8 KW (maximum)
Keying	FSK : 75 bauds (100 wpm) maximum 50v, 100v, 20 ma, 60 ma, all neutral, floating, or either side grounded. 12 to 1,000 cps shift CW : 140 bauds maximum. Keying voltages same as FSK plus dry contact keying. -5 to +5vdc or 0 to +20vdc for linear shift of 12,000 cycles
Ambient operating temperature	Between 0° and 50°C (32° and 122°F)
Humidity	Maximum 90%
Volume of air	Intake : 2600 CFM (est) Exhaust : 2340 CFM (est)
Intake and exhaust openings	Intake : One 13-1/2" x 28" Exhaust : One 10-1/2" x 21"
Heat loss unducted	Standby : 5.0 kw (approximately) Full-power condition : 8.0 kw (approximately)
Temperature rise	Standby : 15°C (59°F) Full power condition : 20° to 25°C (68° to 77°F)
Power requirement	210-250vac, 50-60 cps, three phase, approximately 50 amps/phase. Operation at 390-480vac, 50-60 cps, three phase, approximately 25 amps/phase, is also available
Specifications may change without notice

TUBE COMPLEMENT
RF stages		AF stages and modulator
Number	Type	Number	Type
1	4CX5000A
1	PL-172
1	6146
1	6CL6

THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES
	ITU	Country	ITU	Country
	D	GERMANY	USA	USA