[Boatanchors] Japanese Code oscillators

[William L Howard]

Thanks to all who responded.
I have been discussing Japanese WW II code practice oscillators with the
seller of the set now
up for sale. The Japanese Navy Code practice oscillator runs from either
AC or DC, has two
tubes, one a rectifier tube and the other I assume is an oscillator.
Here is a translation of the instructions for the Navy Morse code
trainer. Receiver refers to a head set and not a radio receiver. The
circuit diagram is shown on my web site article.
The Army set, however, is the set with a variable capacitor.
Bill Howard

Type 99 Japanese Navy Morse Code Trainer
Type 99 Code Practice Equipment Instruction Manual Translated by Taka
Doi
1) Check if the power switch is at "OFF" position or not.
2) Insert vacuum tubes to the specified location.
3) Depending on the supply voltage, connect electric cords to the power
terminals without
making mistake. To this, pay enough attention if the supply voltage is
100 volt AC, 100 volt DC
or 220 volt DC. If DC supply is used, connect the cords so that the
polarity is not wrong.
4) Connect receivers to the specified location (Receiver Terminals). A
set of receiver terminals is
provided on the front panel as well as on the back panel.
5) Key shall be connected to the key terminals (provided on the front
panel).
6) Operate the power switch depending to the supply voltage.
Example:
If the power is AC then the power switch lever shall be at AC position.
If the power is DC (either
in 100 volt and 220 volt) then the power switch lever shall be at DC
position. Maximum 20
seconds after operating the power switch, the equipment shall be
operative.
7) Desired code shall be practiced by operating the key.
8) Volume can be adjusted by volume control. This equipment outputs
maximum approximately
2 volt when 10 receivers are connected in parallel.
9) Tone can be chosen to 800 cycles, 1000 cycles or1200 cycles by the
frequency selector.
10) Power switch shall be returned to "OFF" position when the equipment
is not in use.

William L. Howard Ordnance Technical Intelligence Museum
wlhoward at gte.net  Web Site www.wlhoward.com Phone: 727-585-7756