COLLINS 204H-1

GENERAL DESCRIPTION

204H-1 2.5 KW POWER AMPLIFIER

An automatically-tuned linear power amplifier with 2.5 kw PEP or continuous average power output in the 2 to 30 mc range, when driven by a suitable exciter, such as the Collins 310E-1.

Automatic tuning operation is controlled by prepositioning information and the input frequency. Frequency and phase discriminators, in conjunction with closed-loop servo systems, operate the bandswitch and tuning elements.

All controls are located on the front panel and provide manual override of servo functions. The primary power and tuning sequence can be locally or remotely controlled.

RF circuits consist of a three stage linear amplifier with overall feedback, the final stage utilizing a pair of 4CX1000A ceramic-seal tetrodes. The operating point is carefully controlled to provide high efficiency and low intermodulation distortion.

A broadband capacitance bridge circuit maintains accurate neutralization over the entire frequency range. Service connections can be made either from the top or through the cabinet base. Mounting feet, which fit within the cabinet base, are available for applications requiring shock isolation. The isolators do not appreciably increase cabinet height.

TECHNICAL SPECIFICATIONS
Drive Power	0.1 watt nominal.
RF Bandwidth	Not less than 16 kc between -1 db points.
Distortion	3rd and higher odd order distortion products average 35 db below either of two equal tones required to drive the power amplifier to 2.5 kw PEP.
Power Output PEP	2.5 kw
Primary Power	200-250 v (230 v nom) 50 or 60 cps, 1φ, 6 kva
Input Impedance	52 ohms
Output Impedance	52 ohms
Dimensions	20 x 20¼ x 70 inches (W x D x H)
Weight	650 lbs.
Specifications may change without notice

TUBE COMPLEMENT
RF stages		AF stages and modulator		Rectifiers
Number	Type	Number	Type	Number	Type
2	4CX1000A			2	4B32 or 872A
2	6146			1	5726
1	6CL6

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