TYPE 10 TRANSMITTER
|DATE OF DESIGN
||1.298 Mc/s to 1.915 Mc/s but Submarine Wave was 1.547 Mc/s.
Additionally, submarines used the Harbour Defence Wave = 1.911MHz and
the Destroyer Wave = 1.403MHz. For reception the frequency range extends
down to approximately 70 kHz.
||Motor Alternator. 'B', 'D' and 'E' Class submarines were fitted with
alternators with supply voltages ranging from 95 to 140V DC, and 'C'
Class submarines with supply voltages ranging from 155 to 200V DC. Both
could be used whether the main batteries were being charged or not. The
single-phase alternators were designed to give an output of 1.2kW at 70V
AC 100 cycles at a speed of 3000 revs. For 'S' Class and other small
submarines see below in the where used/fitted section for details of
power supplies. The spark gap chamber had to be cleaned out after every
four hour of signalling period because it got so dirty!
|TYPE OF SET
|METHOD OF PRODUCING OSCILLATIONS
||The Type 10 is a medium powered spark transmitter/receiver which was
fitted into some submarines. Here is a brief history of W/T in
submarines which supports the text in the the PRE WW1 files specifically
1913.one/three/four.pdf.The first submarine fitted for W/T was the HM
S/M B5, and her set, which was partially portable, was cobbled together
using various parts of the then well established Destroyer Set, the Type
4. The fit was ad hoc and posed major operating problems both for the
designer and the the submariners who had to operate it - read the Pre WW
1 files. It became known as the Submarine Set and was given the name
Type 10. However it had to be much modified later on for fitting into
other submarines on a permanent basis [removable only for refits of the
boat], and as a modified system it was established firmly as the Type 10
with B5's fit being referred to as the Portable Type 10, or Type 10[P].
Once modified to permanent [non portable] fitting, the set became
unnecessarily bulky and heavy, and owing to the lack of space available
considerable difficulty was experienced in finding suitable
accommodation for it in existing submarines. In all future boats a place
would be assigned at the outset for fitting the Silent Cabinet and
transmitting instruments in a permanent approved position. The idea was
to design a new submarine set of considerably reduced weight and size
for all new boats.
On the outbreak of war the design of this
light-weight set was not completed, so a small compact set known as a
'Type S' was quickly designed and was fitted into 'S Class' submarines
and any others where there is insufficient space to fit the Type 10 set.
Type S was capable of transmitting the same waves [tunes] as the Type 10
but it was supplied with a 10-inch coil with hammer make and break in
lieu of an alternator or rotary. No Silent Cabinet was fitted with the
Type S. For many years prior to 1914, cleanliness of equipment including
aerials and their associated deck insulators had been taught as
mandatory, for cleanliness led to successful radio communications.
Predictably with the hastily cobbled together Type S set and a war
operating environment, plus the well known fact that submariners can
keep things working with improvised jury rigs [when needs must!] the
Admiralty issued this paragraph which can be found on page 6 of the Type
10 Set Handbook OU 5155. "It should be impressed upon operators that
they cannot pay too much attention to keeping the instruments clean and
dry, and all contacts and connections perfectly clean and smooth; this
particularly applies to exposed connections such as the deck insulator.
Temporary connections and non-service fittings should not be tolerated."
The last sentence is rather naive given the life of a submariner!
||Standard Service Wavemeter designed by HMS Vernon.
Read these three pdf files 10
silent cabinet.pdf , 10 aerial
fittings.pdf and 10 aerial
and read this pdf file 10