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DATE OF DESIGN |
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1. 3T L/F Master Controlled - 1934.
2. 3T L/F Self Excited - 1934
3. 3T Low Power - 1934
4. 3T H/F - 1934
5. Spark Transmitter - 1934 |
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FREQUENCY RANGE |
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1. 3T L/F Master Controlled - 100 - 500 kc/s.
2. 3T L/F Self Excited - 100 - 500 kc/s.
3. 3T Low Power - 100 - 1700 kc/s.
4. 3T H/F - 3000 to 20000 kc/s.
5. Spark Transmitter - 70 - 599 kc/s. |
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POWER SUPPLIES |
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1. 3T L/F Master Controlled - 8kW Motor Alternator with auto voltage control.
2. 3T L/F Self Excited - 8kW Motor Alternator with auto voltage control.
3. 3T Low Power - 100 Watt Motor Alternator supplied from ships 20V mains.
4. 3T H/F - 8kW Motor Alternator with auto voltage control.
5. Spark Transmitter - 8kW Motor Alternator. |
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POWER TO FINAL STAGE. |
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RANGE IN MILES |
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1. 3T L/F Master Controlled - 600 miles.
2. 3T L/F Self Excited - 600 miles.
3. 3T Low Power - 30 miles.
4. 3T H/F - World Wide at times.
5. Spark Transmitter - 100 miles. |
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TYPE OF SET |
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1. 3T L/F Master Controlled - 4.
2. 3T L/F Self Excited - 3.
3. 3T Low Power - 1.
4. 3T H/F - 3.
5. Spark Transmitter - |
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WAVEFORM |
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1. 3T L/F Master Controlled - CW and ICW.
2. 3T L/F Self Excited - CW and ICW.
3. 3T Low Power - ICW.
4. 3T H/F - CW and ICW.
5. Spark Transmitter - Spark. |
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METHOD OF PRODUCING OSCILLATIONS |
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Master Control and Self. |
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WHERE USED/FITTED |
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Type 49P series is the main transmitting (sited in the main W/T office) for Destroyers. Sloops, Netlayers etc. It is also fitted into the second W/T office of Capital Ships, Cruisers, Aircraft Carriers and Depot Ships. It replaces the Types 37 and 38. The most importance improvements in the new set were greater frequency stability and the provision of screening arrangements to reduce the interference to receivers in the same office. The transmitter circuits are contained on panels which are bolted together and fitted in a position to allow the operator easy access to the handles for adjusting the set. It is a medium power set. Like the Type 48 before it, this transmitter had a MASTER OSCILLATOR which had a single controlling valve and was the primary means of producing the oscillations - All the Components of the H/F Master Circuit are enclosed in an earthed copper screening box supported by springs in Panel 3T H/F Master. The set was also fitted with the then conventional (all previous sets) Self Excitation which was used when and if the Master Oscillator became un-useable. The waveform characteristics were shown as follows:-
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ASSOCIATED WAVEMETER |
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1. 3T L/F Master Controlled - G57.
2. 3T L/F Self Excited - G57.
3. 3T Low Power - G57.
4. 3T H/F - G57.
5. Spark Transmitter - G57. |
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FURTHER READING |
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IMAGES, PHOTOS, DOCUMENTS, SCHEMATICS ETC. |
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NOTES. |
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