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TBL-5 AND TBL-6 RADIO TRANSMITTING EQUIPMENTS


Transmitter for Model TBL-5 equipment
Transmitter for Model TBL-5 equipment

Use.-Ship

Frequency range.-175-600 kc. and 2000-18,100 kc.

Power output and emission.-200 watts A1, 100 watts A2 (MF band only) and 50 watts A3. *

Description.-The Models TBL-5 and TBL-6 radio transmitting equipments are designed for installation on submarines, destroyers, cruisers, and other types of vessels requiring a transmitter of low, medium, and high frequency operation with telegraph, modulated telegraph and voice. These models are essentially the same, the TBL-6 differing from the earlier model only in that the motor generator sets are of cast steel instead of cast iron, and the magnetic controllers are designed to withstand a more severe shock. All units of this equipment are capable of passage through a hatch 25" by 20" without further disassembly, when uncrated for installation.

The transmitter, which consists of two frames bolted together and mounted on a single base, comprises two separate radio frequency circuits to allow coverage of the MF and HF bands. The two radio frequency circuits use common vacuum tubes for all stages, with the exception of the master oscillator stage. The relay panel and the terminal board for all external connections with the exception of the antenna leads are located at the bottom of the left frame. The MF Colpitts oscillator circuit and the HF electron coupled oscillator circuit, temperature controlled and suitably shock-mounted, form one unit which is mounted in the lower right frame. The HF first intermediate amplifier and the MF audio oscillator are located in the lower portion of the left frame. The HF second intermediate amplifier is located immediately above this. The MF intermediate amplifier and the MF power amplifier tank circuit occupy the space in the right frame directly above the oscillator assembly. The HF power amplifier is located in the upper part of the left hand frame. The HF antenna coupling and tuning system occupies the top portion of the left frame and the MF antenna coupling and tuning system occupies the top port of the right hand frame.

The filter is a self-contained unit having suitable capacitors and reactors for filtering the motor-generator d-c output voltages. A-c filter units include two step-down transformers for filament and M. O. compartment heater voltages.

The motor-generator set is made up of three direct coupled units mounted on a common bed-plate. The motor is of 3 1/2-horsepower capacity. All a-c-d-c motors are interchangeable on a common bed-plate. The high voltage generator supplies 2,000 volts D. C. at 0.7 ampere for intermediate and power amplifier plate and screen grid potential. The low voltage generator supplies 1,000 volts D. C. at 0.2 ampere for the master oscillator plate and screen grid potential, and 250 volts D. C. at 1.02 amperes for bias and field excitation. Power for operation of type CRV-50064 speech- input equipment, when used in conjunction with the transmitting equipment, is obtained from a separate 110-volt, 60-cycle single-phase supply. Drip-proof terminal boxes are arranged for mounting on either the side or top of each unit and contain fuses for the protection of all circuits as well as terminals for all external connections. (D-c equipments provide a-c filament power from slip rings located on the exciter unit of the low voltage generator.)

The motor starter is of the remote control magnetic contactor type with all switches, contactors, fuses, and overload protection devices mounted on a panel and housed in a metal box with a hinged cover. All external connections are made to the front side of the equipment panel. Power for operation of the motor starting contactor is obtained from the transmitter control circuits.

* The Navy Type CRV-50064 speech input equipment, available under separate contract, is necessary to obtain A3 emission from the Model TBL-5/6 transmitters. Carrier control is obtained by a "push to-talk" switch in this unit when it is used.

TECHNICAL FEATURES

Design.- Navy.

Frequency control.-Master oscillator.

Antenna.-Submarine flat top, loop, inverted L and surface craft antennas having lengths from 50 to 100 feet and a maximum trunk length of 20 feet.

Tube complement

                                       | Number   | New type
Function                               | of tubes |  No.
Master oscillator 1HF, 1MF             |  2       | 860
Audio HF and MF                        |  1       | 860
First intermediate amplifier HF and MF |  1       | 860
Power amplifier HF and MF              |  2       | 803
Total                                     6
Power-
REQUIRED FOR STARTING
              | Line
              | current   |      |      | Power
 Power source | (amps.)   |  KW  | KVA  | factor
              | maximum   |      |      | (percent)
              | per phase |      |      |          
115 volts D.C.| 53        |  6.1 |      |
230 volts D.C.| 27        |  6.1 |      |
220/1/60      | 62        | 13.8 | 23.3 | 59
440/3/60      | 37        | 14.6 | 28.0 | 54

REQUIRED FOR LOCKED KEY OPERATION
115 volts D.C.| 27        | 3.1  |      |
230 volts D.C.| 14.5      | 3.34 |      |
220/3/60      | 10.2      | 3.32 | 3.94 | 84
440]3/60      |  4.7      | 3.1  | 3.57 | 87
Allowable variation in supply line voltage +- 45%, -23% D. C.: +10% A. C.; frequency, +- 5%; combined voltage and frequency +- 10%, (5% each).

Operating control.-Front panel and Navy standard 4- or 6-wire remote-control unit.

Type of keying.-Relay-100 words per minute.

Weights, dimensions, and Navy type numbers of equipment units included in contract

                                 |         Type numbers      |        |        |        |
         Unit                    | TBL-5       | TBL-6       | Height | Width  | Depth  | Weight
Transmitter:                     |                           | Inches | Inches | Inches | Pounds
 115 volts D.C.                  | CAY-52131   | CAY-52131-A | 72     | 31 3/4 | 23 5/8 | 820
 230 volts D.C.                  | CAY-52132...| CAY-52132-A |        |        |        |
 220 volts A.C.                  |             | CAY-52133-A |        |        |        |
 440 volts A.C.                  | CAY-52133   | CAY-52133-A |        |        |        |
Filter unit:                     |             |             |        |        |        |
 115 volts D.C.                  |        CAY-53036-A        | 18 1/4 | 16 1/4 |  9     |  56
 230 volts D.C.                  |        CAY-53036-A        |        |        |        |
 220 volts A.C.                  |             | CAY-53037-A |        |        |        |
 440 volts A.C.                  |        CAY-53037-A        |        |        |        |
Motor generator:                 |             |             |        |        |        |
 115 volts D.C.                  | CC-21426    | CC-21426-A  |        |        |        |
 230 volts D.C.                  | CC-21427    | CC-21427-A  |        |        |        |
 220 volts A.C.                  |             | CC-21428-A  |        |        |        |
 440 volts A.C.                  | CC-21428    | CC-21428-A  |        |        |        |
 Terminal board on the side      |             |             | 17 7/8 | 61     | 16 3/4 | 745
 Terminal board on top           |             |             | 20     | 61     | 13 1/4 | 745
Magnetic controller:             |             |             |        |        |        |
 115 volts D.C.                  | CAY-21234-A | CAY-11713   |20 13/16| 13     |11 15/16|  50
 230 volts D.C.                  | CAY-21235-A | CAY-21714   |        |        |        |
 220 volts A.C.                  |             | CAY-21715   |        |        |        |
 440 volts A.C.                  | CAY-21425...| CAY-21716   |        |        |        |
Equipment spare parts            |             |             | 15 1/2 | 25 1/2 | 16 3/8 | 140
Motor-generator spare parts      |             |             |  6 3/4 | 25 1/2 | 16 1/2 |  85
Bias generator armature (spare)  |             |             |  6 3/4 | 25 1/2 |  7 1/2 |  50
Plate generator armature (spare) |             |             |  6 3/4 | 25 1/2 |  7 1/2 |  50
Motor armature (spare)           |             |             |  9 1/2 | 25 1/2 | 10 1/2 | 80
Shipping weights and dimensions
                                        |               | Gross  | Cubic
                          Unit          |  Size         | Weight | feet
                                        |  Inches       | Pounds |      
Transmitter                             | 42 x 10 x 78. | 1,087  | 56.87
Filter unit                             | 27 x 10 x 17. |   115  |  5.31
Motor-generator set                     | 66 x 21 x 21  |   821  | 16.84
Magnetic controller                     | 27 x 21 x 17  |   117  |  5.58
Box 1. Equipment spare parts            | 29 x 18 x 17. |.  174  |  4.34
Box 2. Motor-generator spare parts.     | 28 x 18 x  8  |   105  |  2.33
Box 3. Bias generator armature (spare)  | 28 x  9 x  8  |    66  |  1.16
Box 4. Plate generator armature (spare) | 38 x  8 x  8  |    68  |  1.58
Box 5. Motor armature (spare)           | 39 x 12 x 11  |   102  |  2.21
Vacuum tubes (regular set as shipped)   | 25 x 23 x 31  |    65  |  9.49
Weights and dimensions given apply to the model TBL-6 230 volt d-c equipments. Figures for TBL-5 a-c and d-c and TBL-6 a-c equipments are approximately the same.

REFERENCES:

The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.

 

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Version 2.00, 11 Sep 2006