Type 30A P


TYPE 30A TRANSCEIVER


DATE OF DESIGN 1925
FREQUENCY RANGE Transceiver - transmitter 150 - 460 kc/s : receiver 65 - 500 kc/s
POWER SUPPLY Supplied from engine which is part of the Set
TYPE OF SET VALVE
WAVEFORM CW - ICW and R/T
METHOD OF PRODUCING OSCILLATIONS SELF
WHERE USED/FITTED Portable Equipment. Type 30A is the name used in the Royal Navy for the Army's Portable Set 'C' MkII.  It is transported on a Trojan tyred cart.  The cart wheels and axle are removable and the cart provide a bench for setting up the receiving station.  The receiver is set up at least 20 yards from the engine to prevent interference, thus dividing the station into two parts which are:-
1.  Transmitter with its engine driven generator, transmitting aerial and accessories.
2.  Receiver with its frame aerial and accessories. 

The transmitter is remote controlled  from the receiving station.
Two tents are supplied to protect the equipment and power unit [not necessarily the men]!
The aerials is very large.

The transmitter emits CW on 150 to 460 kc/s and has a range of 40 miles using one 36 foot aerial; 20 miles with two 15 foot aerials and 3 miles with two 4 foot aerials.
The receiver is cable of reception of CW or ICW-R/T transmissions.  For CW the receiver uses *autodyning* to produce the Morse note.   The receiver consists of a Tuner, an Amplifier and a Herterodyne. It has three frequency bands 300-500 kc/s, 135-300 kc/s and 65-135 kc/s.

Type 30A is fitted in many Fleet units and takes over from the Type 30.

To propel the set along a road with easy gradients, a minimum of four men is required, but with the set removed from the cart and transported in crates as explained in the Book of Instructions, six men are necessary as a minimum. The total weight complete is 1386lbs; without the car 828lbs; receiver and batteries only, 56lbs.

*Autodyne Reception, Self-Heterodyne Reception, are names given to those modes of beat reception in which the auxiliary oscillations are generated within windings and condensers that are essential parts of ordinary receiving circuits*

ASSOCIATED WAVEMETER Army Mk C
SMALL SCHEMATIC AND PHOTOGRAPHS


Two views of same cart - left looking from the back end and right the front end pulling ropes and pulling shaft and handle.
64= Engine; 107 = receiver aerial and aerial mast; 108 = wavemeter; 110 = transmitter; 111= receiver; 112 = tent; 113 = tent; 114 = equipment like Morse key and earphones etc; 115 = equipment like buzzer unit and valves etc; 116 = transmitter aerial box; 117 = tool box

Above - Transmitter schematic

Above - Transmitter


Above- Army Wavemeter


Above - Receiver Schematic


Above - Receiver


Above - Transmitter and Receiver Schematics as a system


Above - Type 30A Transmitting system


Above - Type 30A Receiving system