TRANSMITTERS & TRANSCEIVERS

Type 36M Transmitter

DATE OF DESIGN

The dates of design span from 1928 to 1934, so the overall set can be considered as a 1934 transmitter.
1. 3GB L/F - 1934.
2. 3GB H/F - 1934.
3. Spark Transmitter - 1934.
4. 6D - 1928.

FREQUENCY RANGE

1. TX 3GB L/F - 77 TO 500 kc/s.
2. TX 3GB H/F - 3000 - 20000 kc/s.
3. Spark Transmitter - 77 to 500 kc/s.
4. TX 6D - 77 to 500 kc/s.

POWER SUPPLIES

1. TX 3GB L/F - 20kW Alternator. Filament supply - 3kW Alternator.
2. TX 3GB H/F - 20kW Alternator. Filament supply - 3kW Alternator.
3. Spark Transmitter -
4. TX 6D -

POWER TO FINAL STAGE.

1. TX 3GB L/F - 8 - 10kW.
2. TX 3GB H/F - 3kW.
3. Spark Transmitter - 1.5kW.
4. TX 6D - 40 Watts.

RANGE IN MILES

1. TX 3GB 1000.
2. TX 3GB H/F World Wide at Times.
3. Spark Transmitter - 150
4. TX 6D - 50.

TYPE OF SET (VALVES USED

1. TX 3GB L/F - 6.
2. TX 3GB H/F - 5.
3. TX 3F H/F - 4
4. SPARK TRANSMITTER -
5. TX 6D

WAVEFORM

1. TX 3GB L/F - CW and ICW.
2. TX 3GB H/F - CW and ICW.
3. TX 3F H/F - ICW.
4. SPARK TRANSMITTER - SPARK.
5. TX 6D - SPARK.

METHOD OF PRODUCING OSCILLATIONS

SELF

WHERE USED/FITTED

The Type 36M is the main transmitter in heavy ships and all modern (1934) cruisers and is a much modified Type 36S. The chief alterations embodied in the new set are:-
a. Improved H/F performance.
b. Greater frequency stability.
c. Arrangements for grid signalling, thus enabling the set to be used for automatic high speed transmissions if required.
d. Removal of the lower power attachment and the provision of means whereby the L/F transmitter can be used at a low voltage to meet low power transmission requirements.
e. Inclusion of a spark transmitter for use in case of emergency.
f. Automatic control of the output voltage from the filament alternators by means of reversing boosters.
g. Removal of the aerial tuning linkboard.
h. Some of the Type 36S power boards have been modified for use with the 36M.

The main controlling panel, the Type 2G, containing all the necessary switches to control the set is sited in the CRR next to the operators position. All "on" "off" pushes for the auto-starts are fitted in the CRR as are the main alternator regulators, AC voltmeter and aerial ammeter.

ASSOCIATED WAVEMETER

1. TX 3B L/F - G56.
2. TX 3GB H/F - G56.
3. TX 3F H/F - G7 and G8.
4. SPARK TRANSMITTER - G56.
5. TX 6D - G56.

FURTHER READING

Type 36M Full Schematic

Grid Signalling and Absorber Units

IMAGES, PHOTOS, DOCUMENTS, SCHEMATICS ETC.

Type 36M photos and schematics.

NOTES.

This was the most powerful transmitter in the Fleet and was a modernised version of the Type 36S. 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).

20V Warning Circuits protects the Receivers in outlaying wireless offices when transmitting on the main set/aerial (see the Type 36S for more detail).

Photo 1 - The 20kW Power Supply Panel with the 3kW Filament Supply + 20v DC Battery for the Emergency Spark Set.
Photo 2 -
Photo 3 - 2GB Controlling Board.
Photo 4 - Aerial Circuits and 20 Volt Warning Circuits Schematic.
Photo 5 - Main Keying Circuit Schematic.
Photo 6 - Transmitter 3GB H/F Schematic.
Photo 7 - Transmitter 3GB L/F Schematic.
Photo 8 - Parts of the Type 36M.
Photo 9 - Parts of the Type 36M.
Photo 10 - 3GB H/F Transmitting Panel Upper and Lower.
Photo 11 - 3GB L/F Transmitting Panel Upper and Lower.
Photo 12 - 3GB Smoothing Panel Upper and Lower.
Photo 13 - 3GB Rectifying Panel Upper and Lower.
Photo 14 - 3GB Grid Signalling panel and 3GB Spark panel.
Photo 15 - Typical layout in Heavy Ships.
Photo 16 - Altrnative layout for Light Cruiser.
Photo 17 - Typical layout in Light Cruiser.