Date of Design The type 35S was the first of what can only be called a complicated set! It comprised of six parts, the sixth part being the Type 13 Spark Transmitter already mentioned which dated from 1918. The other five parts [1-5] were designed respectively 1919, 1924. 1928, 1930, 1914, so one could say that 1930 saw its final coming-together.
Frequency Range
Transmitter 3F L/F 3G Low power 3F H/F {later on it was fitted with a 5F - see below for information} 6G Emergency Set Type 13 Tx
Frequency range 60-500kc/s 60-500kc/s 3500-20000kc/s 100-670kc/s 60-500kc/s 375-1364kc/s
Power supply 8kW Alternator 1.5kW Alternator 8kW Alternator 8kW Alternator 20V Battery 1kW Rotary Converter
Filament supply 1.25kW Alternator 1.25kW Alternator 1.25kW Alternator  - - -
Valves used 5 2 5 - - -
Wave form CW & ICW CW & ICW ICW Spark Spark Spark
Associated wavemeter 1492B or G9 1492B or G9 G7 & G8 1492B or G9 - 1492b OR g9
Approximate range in miles 700 100 World wide at times 150 5 50
Date of design 1919 1924 1928 1930 1914 1918
Power Supply  See above to Frequency Range.

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]. 

Type of Set See above to Frequency Range.
Wave Form See above to Frequency Range.
Method of Producing Oscillations Self
Where used/fitted. Type 35S. It is the main transmitter in cruisers.  The Type 13 uses the Type 35S Aerial circuits but  is otherwise separate from the rest of the set.  When a transmitter Type 6G is fitted, the Type 13 usually left out of the installation.  

Also in this series was the Type 35M and also fitted in some cruisers. It was a medium power set, M/F, H/F  and a low power set covering the frequency range of 60-500 kc/s M/F, 4000-20000 kc/s H/F, 100-1700 kc/s Low Power and all Valve sets. The two main sets were capable of CW and ICW, with the Low Power set on ICW only. All were Self Oscillators [non-M.O.]  The power output/range for the M/F was rated as 450W/500 Miles; for H/F 150W/potentially world wide and 20W/40 Miles for the Low Power set, the latter being powered from a 22V Battery or ships mains power.

Associated Wavemeter See above to Frequency Range.
Small Schematic

This is the Type 13 SPARK transmitter fitted as an integral part to the Type 35S

Note the complicated aerial switch with its 'wandering' connection lead. It accommodated switching  from the output of the SPARK transmitter, or the VALVE transmitter, and if the latter whether to L/F or to H/F, and when to H/F, to either the H/F transmitter or receiver.

This is the H/F Transmitter
and below, the L/F Transmitter

The 35S Emergency Transmitter


Part of the Type 35 Transmitter Panel

and the other Part of the 35S Transmitter

Type 35S Magnetic Key and Relay Switch


Type 35S Power [left] and Transmitter [right] Panels


The 5F transmitter was a 3-stage master controlled H/F set fitted as an attachment to the Types 35S/M, 36S, 36M, 48, 48C as a addition and modification to the H/F side of the transmitters.

It frequency range was 14-23 Mc/s in a single band and could emit CW or ICW. The set was fitted with a cathode ray tube tuning indicator for the intermediate stage, the "shadow" on the screen of the indicator being narrowest when the stage is in tune with the master oscillator.