TRANSMITTERS & TRANSCEIVERS

Type TBK/TBM Transmitter

DATE OF DESIGN

Pre WW2

FREQUENCY RANGE

2000 - 18100 kc/s.

POWER SUPPLIES

230V AC. Taken from ships supply to supply a generator unit having outputs of 3, 2 and 1 kW V D.C. for anodes and screen grids supplies, 275 V D.C. for Bias Supplies and 160 V A.C. for filament heaters.

POWER OUTPUT.

CW = 500W MCW = 350W
R/T = 350 W.
Both sets can operate with a reduced output of 75W over the frequency band 2000-9050 kc/s but using CW only.

TYPE OF SET (VALVES USED)

VALVE

WAVEFORM

TBM = CW MCW and RT.
TBK = CW

ASSOCIATED WAVEMETER.

GJ or GN.

METHOD OF PRODUCING OSCILLATIONS

Master Oscillator.

WHERE USED/FITTED

TBM/TBK. Both sets are American designed and the only difference between the two is that the TBK can only emit CW - it is not fitted with a Modulator. The CW keying can be up to 100wpm whereas the keying for MCW is restricted to 50wpm.

These sets have been fitted in some cruisers, light fleet carriers and 'Battle' class destroyers.

A general purpose medium power MF AM transmitter for communication between ship/ship, ship/air, ship/shore. It is fitted as one of th main transmitters in certain ships but is being superseded by Type 604.

FURTHER READING

PHOTOS, SCHEMATICS, DOCUMENTS

Photographs and Schematics of Type TBK/TBM.

NOTES.