A | Raising & Lowering control for main W/T aerial, for many years the Type AWO as fitted to Alliance. |
B | Main W/T transmitter for a lengthy period the Type 623, but before that the Type 89Q and before that the Type 55M |
C | Aerial Change over Switch for use with the main aerial (AWO) or with the AWJ (hand riggged telescopic aerial sited starboard site forward on fin top from which the commissioning pennant was usually flown. The AWJ was referred to as the "emergency aerial". |
D | The SHF D/F set Type UA3. Sited in the W/T office but operated by the watch Radar Plot rating. It was an extremely useful tool against ASW aircraft. Its aerial was the SHFDF (known as shuffduff) telescopic aerial , the mast closest to the bow of the boat (raised and lowered as for a periscope), on the very top of which was the V/UHF communications aerial. |
E | UA3 's operators seat but used by others of course. |
F | The main AWO transmitter send/receive relay. A submarine could either transmit or receive but not both together when using MF and HF frequencies. |
G | The cathode follower. A device which controlled the reception on LF/VLF from the Port/Stardboard, Forward/Aft loop aerials which were built into the upper parts of the fin. It was known as the ALF. Before such a device submarines were fitted with jumping wire aerials stretched from forward to aft over the top of the periscope stanchions, when the submarine steered a course pointing towards the distant transmitter for best reception. |
H | Is No 1 MF/HF B40 receiver for general communications requiring signals to be sent from the submarine to word wide stations. Before the B40, Type B28's were used, and after the B40, the Racal RA117 (modified for naval use and fitted with a LF/VLF adaptor known as the Type CHC/CHB series) was used. |
I | The No2 B40 receiver where the same data as above applied. |
J | This was the Type B41 used for LF and VLF reception. Before it was the Type B29. When the CHC/CHB receivers were fitted, the B41 was taken away and the space it occupied (although now smaller because the CHC/CHB receiver was wider that a B40/B41) was used for other non-equipment purposes. |
K | The standard pussers typewriter which replaced the original old Imperial model. |
L | The built in pussers standard Morse Key. |
M | The standard naval tape recorder, originally a commercial Phillips device but later a naval device known as the REH1. It became more modern when the REH5 was introduced in the early 1960's. |
N | An under bench deck mounted V/UHF transceiver. Originally VHF using the Type 86M but later changed to UHF and the Type 696 transceiver. |
O | A seat designed for two operators to use the office simultaneously but very cramped. |
P | The fleet cryptographic machine. Originally the Type X/CCM and replaced in the 1950's with the KL7 machine for off line encrypting/decrypting. |
Q | The Type TCS. A USN piece of equipment from WW2. It was fitted as the emergency MH/HF world wide transmitter. |
R | A control panel adjacent to the main passageway and sited at the entrance to the W/T Cage for routing and power distribution. It also involved heavy cables which the W/T staff dragged and connected to the services most needed. |
S | In the Cage was the emergency diesel generator supplying power to basic W/T equipments when main battery power was lost. |