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Army Radio Sales Co. :: wire communication equipment
| wire communication equipment |
wire communication equipment
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Wire Communication Equipment
Type 92 Field Telephone |
Type 92 Field
Telephone
There are three types of Japanese field telephones, known to exist. The standard telephone
was the Type 92. This is a beautiful piece of workmanship, it is a wooden case with
brushed aluminium fittings. The top cover opens to reveal the headset/mike,a second
headset, and the line connections. Both the earphone and the microphone are together with
a cast metal horn extending down for the mouth piece. There is a push to talk lever along
one side of the headphone assembly.The front panel folds down to reveal a rack for two
batteries, the removable lightning arrestor and a spare parts kit. Also shown are the
bell, generator, and the network components. The lightning arresstor is removed and
connected to the terminals on the top.
This set should come in a leather case with a long sling and with a brass ground spike
which resembles a tent peg. These sets in top condition with all parts can be worth up to
$250.00. Missing parts, the value drops rapidly. The lowest price I have heard about was
$75.00 for a set less the leather case. The set had a generator crank that screwed in to
the side. Often this got lost. Jerry Price of Palm Beach Gardens has a recently made
supply of these in case your telephone is missing one.
Type 92 Field Telephone |
Type 92 Field Telephone |
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Type 92 Late War Telephone |
Trench Telephone |
The Model No 2 Trench
Telephone
This set seems to be a late war development. It was first reported in a British
Publication. The two samples that I have seen were both made by the OKI ELECTRIC COMPANY
and were so marked in English! The set also came in a leather case. The set was made of
wood but did not have the brushed aluminium fittings. The set is more compact than the
Type 92 telephone. The set has a side panel that opens to reveal the generator, net work
and battery compartment. This set required only one battery rather than the two used in
the Type 92 telephone.This set has a generator crank that is built into the drive gear that contacted the
armature shaft of the generator. It pulls out, bends to shape and then can be used as a
crank. This solved the problem of the removable crank handle getting lost somewhere. This
set also has a fibreboard gear wheel to drive the generator and on the sets that I have
seen, this gear had been stripped and was non-operational. |
Type 98 Telephone Intercept Amplifier |
Type 98 Telephone
Intercept set
In Dec 1998, the eBay Auction had one of these sets for sale, It finally sold for $510. It
consisted of a three tube amplifier. It came in a wooden case, had the amplifier in the
top and in the bottom were spaces for the batteries and the headset. This was employed by
running a pick up line along side the enemy (U.S. / Allied forces) and the electromagnetic
impulses would be picked up and amplified.I recently had the opportunity to read an
article by Arthur Bauer on Land Line communication by the German Army. The Germans in WW I
made use of a single line for their field telephones with the other line being connected
to the earth. This saved on telephone wire but the French figured out that they could
plant several ground spikes in different locations and with the use of an amplifier, pick
up the signals being transmitted through the earth/ground connection.
The Japanese must have realised this and they produced the Type 98 Telephone Intercept
Amplifier. Very little is known about this set. Mr. Takashi Doi of Japan indicated
that they would run a wire out and use it to pick up signals from the enemy telephone
circuits.
Since Japanese Telephones were designed to make use of a ground or earth return system,
this set was probably designed to do that. It consisted of a three tube amplifier. This
particular set was sold on the eBay auction to a Canadian collector some time in
1998. I never heard if he got it working or not.
I suppose it would be possible to use it as an induction pick up if an induction coil
type set up was placed in proximity to American or allied telephone lines, but that seems
unlikely. Mr Doi said it was supposed to have a 250 meter pick up wire placed next to the
enemy telephone line. |
Type 98 Telephone Intercept Amplifier |
Type 98 Telephone Intercept Amplifier, Inside View |
Japanese Telephone / Telegraph Device |
Japanese Telephone /
Telegraph Device
I was given this device by John Orahood of Houston, Texas. Unfortunately the
data plate had been removed, no doubt as part of the "JAPLATE’ program. With
out a data plate it was impossible to learn the nomenclature of the item.
On first examination, it looked like one of several devices used to remote
the larger transmitters. These had on board keys, provisions for remote key
and a telephone system, The remote station would buzz the operator, alert
him to what frequency, etc and then could key the transmitter from a distant
station which was connected by telephone wire. |
Examination of this unit revealed that was not it’s purpose. This unit had a
sliding door which opened to reveal a red signal light type of device. My next
thought was some sort of signalling device. Further examination ruled out this
possibility.
The line terminals connected to a key jack (4) through a fuse (7) and an RF
Choke coil (3). Line Terminal (2) through Fuse (7) and the RF Choke coil. Line
Terminal 1 went direct to the key jack (4) and to Push button DPDT switch (11).
Capacitor (5) [0.5 mfd] and Resistor (6) were connected in series across the key
jack terminals. The line terminals then went to a push button DPDT switch (11).
In the open position one lead went to a toggle switch (9) and then to light
housing (10). This was not just a plug/screw in light housing but some other
sort of light device. It would require a major overhaul to open this item up.
With the push button held down, the circuit then went to what can best be
described as a telephone network. Item (16) was a microphone with a push to talk
switch and when the push to talk switch was depressed, it put the microphone and
a 1.5 volt battery in series with a coil (14) which was wound on the same core
as item (13) which seemed to be a buzzer. Item (13) was a centre tapped coil.
One outer lead went to the Line Terminal (2) through capacitor ( 8 ? ) [2 mfd]
and Fuse (7). The centre lead went to item (15), the earphone and then back via
Switch (11) to Line terminal (1).
As was pointed out, if this was a transmitter remoting device, there would
have to be a battery somewhere in the keying circuit to operate the transmitters
keying relay.
Disassembly of the hand set revealed that the microphone element was made by
OKI Electric, a manufactures of telephones for the Japanese military. There were
no part numbers on either the microphone or earphone. The number 39 was painted
on the microphone and 1.5V was also painted on. The unit was powered by two 1.5
volt batteries and there were three battery wires so one cell was used for the
microphone circuit. Further examination of the faded schematic, revealed that
the full 3 volts went to Line Terminal (2) and to coil (14), through capacitor
(12) [0.5 mfd], through switch (11). It also put the 3 volts through item (15)
the earphone.
The Japanese Type 95 telegraph unit has a battery powered one tube amplifier.
I have never seen one of these up close and have no access to the schematic
diagram but my final interim conclusion was that this unit must have been used
in conjunction with a Type 95 telegraph set and a field telephone line. If
anybody has a better explanation, I would appreciate knowing what it is. If
anybody has one of these units with a data plate, I would appreciate a picture
of the data plate.
Back to Collection of Japanese W.W.II
Military Radios Index.
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