Date of Design The type 36S [like the Type 35S before it]  was a complicated set! It comprised of five parts [one less than the Type 35S], with three parts being VALVES and the other two SPARK High and SPARK Low frequency. The dates of design shown below in the table start in 1921 and finish in 1930, so the overall set can be considered as a 1930  transmitter.
Frequency Range
Transmitter 3G L/F 3G Low power 3F H/F 6G 6D
Frequency range 75-500kc/s 60-500kc/s 4000-20000kc/s 100-670kc/s 77-500kc/s
Power supply 20kW Alternator 3kW Alternator 20kW Alternator 20kW Alternator 20V Battery
Filament supply 3kW Alternator 3kW Alternator 3kW Alternator  - -
Valves used 5 2 4 - -
Wave form CW & ICW CW & ICW ICW Spark Spark
Associated wavemeter 1492B or G9 1492B or G9 G7 & G8 1492B or G9 1492B or G9
Approximate range in miles 1500 100 World wide at times 150 50
Date of design 1921 1924 1928 1930 1928
Power Supply  See above to Frequency Range. This was the most powerful transmitter in the Fleet.

The power supply control panel was large and was split into four separate boards as shown in this picture.  The boards were fitted opposite the Transmitter panels within easy reach of the operators in the CRR [central receiving room]. 

20 kW Power Circuit

Type of Set See above to Frequency Range.
Wave Form See above to Frequency Range. See also CONTINUOUS WAVES.  When set to operate in the VALVE mode, this set was capable of emitting either "C.W." , "T.T. Double Pulse" or "T.T. Single Pulse".  The "T.T." stood for 'Tonic Train' or "I.C.W." [Interrupted Continuous Wave], the 'Double Pulse' using a limiting AC input [to avoid internal sparking within the transmitter] of 300V and a 1kc/s tone and the 'Single Pulse' 250V with a 500 c/s tone. The 'Double Pulse' used both rectifying valves whereas the 'Single Pulse' just one: in both cases the HT was unsmoothed the smoothing condensers disconnected and earthed for 'Double' but not earthed for 'Single'.
Method of Producing Oscillations  -
Where used/fitted. Type 36S. It is the main transmitter in heavy ships and all modern [1930] cruisers. It is being replaced by the Type 48. The transmitter circuits of the Type 36S are carried in five VALVE panels which face the power boards. The SPARK attachment, Transmitter 6G, is built into the space formerly completely occupied by the smoothing condensers, which have now been redesigned to occupy a smaller space in the same panel.  The emergency set, Transmitter Type 6D is fitted inside the cage. The switches necessary for the control of the set are mounted on a special panel "Board 'G' Controlling" which is fitted within easy reach of the operator in the C.R.R.
Associated Wavemeter See above to Frequency Range.
Small Schematic

Full schematic of the Type 36 S  CLICK HERE 36S FULL SCHEMATIC.pdf

and below the Equivalent Circuit

No 10 DC Switch above is the "SAFE TO TRANSMIT SWITCH".  This is printed on the covering lid for the switch, and when required [man aloft working for example], switch 10 above is broken, then the lid is shut and locked.


Above and below, pictures of the massive bulk of the Type 36S Transmitter


Transmitter 3G Low Power

Part of 20kW Power Unit

and supporting text telling of the necessary protection of RECEIVERS in outlaying wireless offices.