AN/URC-32

Description

Radio transceiver AN/URC-32 is a manually operated radio communication equipment for operation in the 2-30 mHz range. With a power output of 500 watts, this transceiver is capable of transmitting signals over long distances. It is designed for single-sideband transmission and reception on upper sideband (USB), lower sideband (LSB), or the two independent sidebands simultaneously, with separate AF and IF channels for each sideband. In addition to SSB operation, provisions are included for compatible a-m (carrier plus upper sideband), CW, or frequency shift keying (fsk). The fsk mode of operation is used for sending radio teletype (RATT) and facsimile (FAX) signals. The frequency range of 2 to 30 mc is covered in four bands. The desired operating frequency is selected in 1 kHz increments (0.1 kHz on B model) on a direct-reading frequency counter. Frequency accuracy and stability are controlled by a self-contained frequency standard. Provisions also are made for using an external frequency standard. Because of its versatility and power, the AN/URC-32 is installed on most Navy ships having a requirement for communicating at long distances.

Cross Reference Chart

The URC-32 is essentially a Collins KWT-6, the following chart describes the individual components between the Collins and Military designations.

Collins to Military Component Designations
Description	Collins	Military
Transceiver Power Amplifier	367A-3	AM-2061/URT
Frequency Generator	786E-1	CV-731/URC
Sideband Generator	786F-1	AM-2061/URC
Audio and Control Unit	159B-1	AM-2062/URC
Audio and Control Unit	159B-2	AM-2062A/URC
High Voltage Power Supply	428B-1	PP-2153/U
Low Voltage Power Supply	429B-1	PP-2154/U
Dynamic Handset	Dynamic Handset	H-169/U and Cord Assembly CX-1846A/U
Handset Adaptor	Handset Adaptor	Control Power Supply C-2691/URC
Frequency Comparator	54Q-1	Signal Comparator CM-126/UR
CW and FSK Unit	CW and FSK Unit	Converter Monitor CV-730/URC
Dummy Antenna	172J-1	Electrical Dummy Load DA-218/U
Junction Box	153H-3	Interconnecting Box J-1007/U
Blower	199G-3	Electronic Equipment Air Cooler HD-347/U
Mounting Rack and Shock Mount	Mounting Rack and Shock Mount	Electrical Equipment Rack MT-2092/U

Military HD-347/U Electronic Equipment Air Cooler (Collins Blower 1990-3)

Collins Blower 1990-3, shown in figure 20, is a centrifugal blower capable of delivering 125 cfm of air at a pressure equivalent to 1.83 inches of water. The 1990-3 includes a double-pole, single-throw switch which is actuated by air pressure. The switch contacts are used as interlocks for the primary power to the system. A block diagram of the 1990-3 is shown in figure 21. The unit mounts in a standard 19-inch open-type rack. Cooling air is supplied to the units mounted in the rack through a central air duct, All power and control connections are made through an 8-pin connector located on the top of the 1990-3. Access to components is obtained by removing the front cover and air filter.

Technical characteristics

VOLTAGE SOURCE

115/230 Volts AC, 50 to 60 cps.

POWER INPUT

215 watts at 1.0-in. water gauge pressure.

OUTPUT CAPACITY

125 cfm at 1.83-in. water gauge static pressure.

DIMENSIONS

8-7/8 in. high by 11-1/4 in. deep by 19 in, wide.

WEIGHT

22 pounds.

REQUIRED RACK SPACE

8-7/8 in,

Blower Bearing Replacement

On of the most common issues with the Cooling unit is the bearings become noisy. They are very simple to replace. The Bartlett Bearing Part number for this part is "WC87038" 2 are required. As of Dec 2016 they were $23.00 each. As an alternative you can use the ultra common 608 bearing which is a common skate bearing and cost under $4.00. it is thinner than the original, but will work perfectly fine. Some shimming may be required.