Date of Design The Type 49 Series {Types 49, 49C, 49M, 49MR, 49X and 49Y} were the products of 1934  - this Series was ubiquitous being fitted in medium sized vessels as well as in heavy ships, during and after WW2.  An example only of those ships fitted with or earmarked to be fitted with are shown below:-
Type 49 Hood, Glasgow, Manchester, Newcastle, Ajax, Amphion, Birmingham, Signal School Portsmouth, Woolwich  etc
Type 49C:  Ark Royal, Belfast, Forth, Kenya, Maidstone, Queen Elizabeth, Royal Oak, Renown , Warspite etc
Type 49M Black Swan, Grasshopper, Grenville, Gurkha, Hotspur, Duncan, Eskimo etc
Type 49MR: Inglefield, Intrepid, Kelly, Lookout, Zulu, Juno, Jupiter, Ivanhoe, Lively, Loyal etc
Type 49X: Boyne, Colne, Doon as replaced by the Marconi TW12B Transmitter.
Type 49Y: Duncan replaced by 49M
Frequency Range
Transmitter 3T L/F 3T Low Power 3T H/F Spark Transmitter
Master Controlled Self Excited
Frequency range 100-500 kc/s 100-500 kc/s 100-1700 kc/s 3000-20000 kc/s 70-500 kc/s
Power supply 8kW  Motor Alternator with auto voltage control 8kW  Motor Alternator with auto voltage control 100 Watt Motor Alternator supplied from ships 20 V mains 8kW  Motor Alternator with auto voltage control 8kW  Motor Alternator 
Valves used 4 3 1 3 -
Wave form CW & ICW CW & ICW  ICW  CW & ICW  Spark
Associated wavemeter G57  

G57

 

G57  G57 G57 
Approximate range in miles 600 600 30 World wide at times 100
Date of design 1934 1934 1934 1934 1934

Note: Space limitation does not allow the Transmitter 3T H/F to be fitted with Master Control Circuitry - just Self Excitation.

Power Supply See above to Frequency Range. The power board consists of two panels [upper and lower] which are secured to the transmitting panels.

Click here to see the power supplies 49 power supplies.pdf

Type of Set See above to Frequency Range.
Wave Form See above to Frequency Range.
Method of Producing Oscillations Master Control & Self
Where used/fitted.

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:-

Waveform Method of producing oscillations Nature of Circuit Grid Excitation Feed Aerial Excitation High oscillating potential electrode
Master Main Master Main Master Main

TYPE 49 Transmitter 3T L/F Master Control

CW or ICW Master Controlled Tuned circuit between anode & grid Tuned circuit between anode & filament Direct inductive Direct inductive from Master circuit Parallel Parallel Direct inductive Anode
TYPE 49 Transmitter 3T L/F Self Excited - standby for Master failure
CW or ICW Self Tuned circuit between anode & filament Direct Capacitive Parallel Direct Inductive Anode
TYPE 49 Transmitter 3T H/F
CW or ICW Self Tuned circuit between anode & grid Direct inductive Series Capacitive Anode
TYPE 49 Transmitter 3T Low Power
ICW Self Tune circuit between anode and grid Direct inductive Parallel Mutual Inductive Anode
Associated Wavemeter See above to Frequency Range.
Small Schematic

See this file for all the switching circuits - aerials, sets, emissions keying etc 49 DC AUXILIARY CIRCUITS.pdf

and this to see the overall schematic of the set 49 OVERALL CIRCUIT DIAGRAM.pdf

Click here to see the schematics of the 3T L/F Set, both Master and Self Oscillations 49 LF schematics.pdf

Have a look at the aerials for the 49 49 AERIAL LAYOUTS.pdf

Look here to see other [and better] pictures of the Transmitter 4T OTHER PICTURES OF THE TRANSMITTER 4T.pdf

Ignore the text in the picture above.

Photographs

Above and below the Transmitter Type 49

 

 
 


















* Earlier in the century, the early years of HMS Ganges at Harwich saw two ships [there were others] one named 'Ganges' and the other 'Ganges II'. For a short period only and at a parochial level only, 'Ganges II' was nicknamed "the twicer"!





* Earlier in the century, the early years of HMS Ganges at Harwich saw two ships [there were others] one named 'Ganges' and the other 'Ganges II'. For a short period only and at a parochial level only, 'Ganges II' was nicknamed "the twicer"!