HARRIS SW-100

GENERAL DESCRIPTION

SW-100, 100 kW Short Wave Broadcast Transmitter

photo Harris SW-100

Gates SW-100 provides overall performance superior to that of any other short wave broadcast transmitter in the same power range-and at significantly lower operating costs. This is made possible by Gates' exclusive high level Pulse Duration Modulator (U.S. Patent No. 3440566).

HIGH EFFICIENCY-EXCEEDS 60%: The Pulse Duration Modulator employed in the transmitter is almost 90% efficient (instead of the usual 50% or 60%), allowing an unusually high overall efficiency of more than 60%. This means about one-third less power consumption than that of other high level plate modulated 100 kilowatt transmitters.

ONLY FIVE TUBES: The transmitter employs just five tubes-with a modern ceramic 4CV50,000E power tetrode in the modulator and final RF power amplifier sockets. All power supplies utilize long-life solid-state silicon rectifiers. Highest quality components, conservatively rated, are used through out the SW-100 to assure greatest reliability.

CONTINUOUS 100% MODULATION RATING: The high efficiency series type Pulse Duration Modulator permits continuous 100% sine wave or trapezoidal modulation. Another feature of this high efficiency series type modulator is convenient front panel carrier adjustment over a wide range.

PRE-SET TUNING: After the SW-100 has been tuned to the desired frequency manually, the exact position of each variable tuning element is stored in a simple "memory". Up to ten different frequencies from 3.2 to 26.5 MHz can be "remembered", which allows pushbutton re-tuning to any preset frequency without further manual tuning. Few controls and ample metering make this the easiest tuning 100 kW transmitter available.

QUIET VAPOR PHASE COOLING: Vapor phase cooling reduces noise by eliminating the need for large blowers moving high velocity air. One two-horsepower fan cools the heat exchanger and flushes the transmitter cabinets, resulting in whisper-quiet operation. Vapor phase cooling also extends tube life by helping to eliminate "hot spots" and maintaining anode temperatures far below those attained by other methods.

GREATLY REDUCED FLOOR SPACE: Due to the high efficiency of the transmitter and the elimination of large iron core components (no modulation transformer and reactor), the SW-100 requires only 7.0 square meters (76 square feet) of floor space. Careful cabinet design provides easy occessibility to all components.

TRANSMITTER LAYOUT: The standard layout of the transmitter consists of two cabinets, a heat exchanger designed for mounting on top of the cabinets, and an external high voltage power transformer. Front and rear doors, and meter panel are magnetically latched. External connections to the transmitter are made through the top so that floor ducts are not necessary.

Ideal for use in all types of climate, this transmitter greatly reduces the problems of cleaning and filtering of outside air. With vapor phase cooling, ducting outside air into the transmitter is not necessary. Also, the cooling system requires little attention other than maintaining the proper purity and water level in the reservoir tank.

TECHNICAL SPECIFICATIONS
Power Output	100,000 watts nominal unmodulated; capable 110,000 watts
RF Frequency Range	3.2 to 22.0 MHz. Optional 3.95 to 26.5 MHz
Method of Tuning	Manual, or selection of 10 pre-set channels
RF Output Impedance	300/900 ohms, balanced
RF Frequency Stability	±1 x 10^-6 (±22 Hz at 22 MHz)
Spurious and Harmonic Emission	Less than 50 mW
Carrier Shift	Less than 2% at 95% modulation. Less than 5% at 100% modulation
Audio Frequency Response	±1.5 dB from 50 to 10,000 Hz referenced to 1,000 Hz at 95% modulation
Audio Frequency Distortion	Less than 3% from 50 to 10,000 Hz at 95% modulation
Noise	55 dB below 1,000 Hz, 100% modulated level
Audio Input Level	0 dBm ±2 dB for 100% modulation
Audio Input Impedance	600/150 ohms, balanced or unbalanced
Modulation Level	100% sinusoidal, continuous, 50-5000 Hz
Trapezoidal Modulation	Less than 5% tilt or overshoot, 100 Hz to 2000 Hz
Power Input	Any specified voltage 380V to 480V, 3 phase, 50 or 60 Hz
Power Consumption	No modulation: 165 kW 30% modulation: 170 kW 100% modulation: 250 kW
Power Factor	Greater than 95%
Voltage Regulator	Electronic voltage regulator for all power supplies other than high voltage
Crowbar Response	Less than 5 microsecond operate time
Overall Efficiency	60% @ average modulation
Temperature Range	0 to +50°C ambient air temperature
Humidity	95% relative humidity, maximum
Storage Temperature	-35°C to +60°C
Altitude	Up to 1829 meters (6000 feet) above sea level
Cabinet Data	Each of two cabinets measures 1.83 meters (6 feet) wide, 1.37 meters (4.5 feet) deep, and 1.98 meters (6.5 feet) high. The heat exchanger adds another 1.06 meters (3.5 feet) in height
Specifications may change without notice

TUBE COMPLEMENT
RF stages		AF stages and modulator
Number	Type	Number	Type
1	4CV50,000E	1	4CV50,000E
1	4CX1500A	1	4CX1500A
		1	F-1099

THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES
	ITU	Country	ITU	Country
	ARG	ARGENTINA	AUS	AUSTRALIA
	BDI	BURUNDI	CHL	CHILI
	EGY	EGYPT	INS	INDONESIA
	JOR	JORDAN	LBY	LIBYA
	MLA	MALAYSIA	NMB	NAMIBIA
	NPL	NEPAL	NIG	NIGERIA
	OMA	OMAN	PLW	PALAU
	POR	PORTUGAL	ARS	SAUDI ARABIA
	SEY	SEYCHELLES	SWZ	SWAZILAND
	TWN	TAIWAN	USA	USA