TYPES TBK AND TBM P


TYPES TBK and TBM TRANSMITTERS


DATE OF DESIGN Pre WW2
FREQUENCY RANGE 2000 - 18100 kc/s
POWER SUPPLY 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.
TYPE OF SET VALVE
WAVEFORM TBM = CW MCW and RT : TBK = CW
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.

ASSOCIATED WAVEMETER GJ or GN
POWER OUTPUT CW = 500W   MCW = 350W   and 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.
SMALL SCHEMATICS



PHOTOGRAPHS