AN/URT-2 AN/URT-3 AN/URT-4 Transmitter Information

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Technical Article
"An automatic tuning communication transmitter"
Dettman, M.
IRE International Convention Record
Volume 1, Issue , Mar 1953 Page(s): 137 - 144
An essentially identical article is here beginning on page 271
An additional article on the automatic tuning system begins on page 279

Manuals
The 24 Feb 1953 "Temporary" instruction books NAVSHIPS 91833 is typewritten
and missing a number of illustrations. Module removal and repair sections are also missing.

The 91833(A) version is typeset and includes the missing sections.

Maintenance & Repair Training Notebook

Specification
MIL-T-15480A (SHIPS)

Development - See also TEG Development
XTEJ description November 1945
XTEJ description (Westinghouse) September 1946
TEJ Development Project
Nomenclature Change September 1950
        TEJ=>AN/URT-4, TEK=> AN/URT-2, TEL=> AN/URT-3
Federal Development began in 1947, prototype 1948, field test 1950
NObsr 43409   17 June 1949 Federal Telephone & Radio Corp.
NObsr 52021   01 Sept 1950 Federal Telephone & Radio Corp.
Approximate Cost
     AN/URT-2 $21,340 ea.
     AN/URT-3 $24,390 ea.
     AN/URT-4 $44,220 ea.

Output
AM/CW/FSK
URT-2 - 100 watts 300kc-26mc
URT-3 & URT-4 - 100 watts 300kc-2mc & 500 watts 2mc-26mc

Power requirements
Transmitter group - 115 vac single phase, 1000w
Booster - 220 or 440 vac, 3 phase, 1800w

URT-4 equipment diagram

Transmitter

Booster

Antenna Control Unit

More Photos - Antenna Tuner and other Accessory Units

THE XTEJ-SERIES TRANSMITTING EQUIPMENTS (from 1952 Introduction to Radio Equipment NAVPERS 10172-A)

This series of transmitting equipments incorporates the very latest design and engineering in mechanical as well as electrical features, and will eventually replace many other types of transmitters of earlier design. It is very versatile in that the major circuit elements are made up into separate units, thus providing a sort of "building-block" system from which many types of equipment can be assembled. At present there are three standard types in the series, known as the AN/URT-2, -3, and -4.
The AN/URT-2 consists of the minimum number of basic units, and has a power output of 100 watts. The AN/URT-3 is the same, with the addition of a 500-watt booster amplifier and its associated power supply, thus providing optional output power of 100 or 500 watts. The AN/URT-4 consists of two of the AN/URT-2 equipments plus the booster amplifier, thus providing two entirely independent transmitting channels of 100 watts output, with the 500-watt booster amplifier available for use with either channel when desired. This arrangement is shown in figure 163. Note particularly the great saving in size.
All equipments cover the frequency range 0.3 to 26 Mc. Since the frequency-generating unit is designed to produce all frequencies in this range, no doublers or other frequency-multiplier stages are required in the transmitter. The frequency-generating unit, intermediate amplifier stages, and the final amplifier all function at the desired operating frequency. Up to ten pre-tuned channels may be selected by means of a telephone dial.
The equipment is capable of operation on c-w on-off and frequency-shift telegraphy, including teletype and facsimile, and voice modulation. Vacuum-tube keying circuits insure accurate keying even at very high speeds.
Output circuits feed a standard 50-ohm coaxial transmission line, which terminates in an automatic antenna tuning unit located near the antenna. This method permits the adjustment of the antenna to the proper impedance to match the transmission line, so that transmitter, line, and antenna all operate at maximum efficiency regardless of frequency or type of antenna.

Components

UNIT	MODULE	DESCRIPTION
OA-353/URT	transmitter group
	AM-519/URT	RF amplifier, RFA
	MD-143/URT	low level modulator, LLRM
	O-153/URT	radio frequency oscillator, RFO
	PP-667/URT	low voltage power supply, LVPS
	PP-668/URT	medium voltage power supply, MVPS
	CY-992/URT	cabinet

OA-354/URT	Booster - modulator-power supply group
	MD-149/URT	high level modulator, HLRM
	PP-707/URT	high voltage power supply, HVPS
	CY-993/URT	HLRM cabinet
	CY-994/URT	HVPS cabinet
	CW-287/URT	booster cover
	MT-958/URT	mounting with blowers
OA-297/URT	ACG antenna control group
	C-915/URT	Control Indicator
	AM-555/URT	Electronic Control Amplifier (2 ea.)
	AM-556/URT	Electronic Control Preamplifier (2 ea.)
	PP-708/URT	Power Supply
	CY-1047/URT	cabinet
TN-197/URT	antenna tuner (inductor)
CB-5/URT	capacitor assembly (tuner)
C-916/URT	transmitter remote control
Test equipment
	ME-88/U	RFO RF voltmeter
	DA-91/U	transmitter bay dummy load
	TS-803/URT	RF Tuner test set
	TS-804/URT	ACG test set
	OA-466/URT	8' transmitter extender cable set w/ case (for URT-2)
	OA-494/URT	8' transmitter + booster extender cable set w/ case (for URT-3, -4)