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TM 9-2320-356-BD
2. Making an ohmmeter (continuity tester).
An ohmmeter can be made
from a flashlight bulb,
flashlight battery, and
three pieces of wire.
When the free ends of
the wires are touched
to a circuit where
continuity (or a short)
exists, the bulb will
glow.
If a two-cell
flashlight bulb is used
with only one battery,
the bulb will glow with
one-half its normal
b r i l l i a n c e.
3.
Making an RF Transmitter Output Tester.
This device is used to determine if the radio is sending a signal to the
antenna.
a.
An RF transmitter output tester can be made from a neon light bulb and a
piece of CG-1773 RF cable.
Solder the bulb to the cable as shown in the
i l l u s t r a t i o n.
Connect the cable to the ANT connection on the front of the radio.
When the radio is keyed, the bulb will glow if RF power is present at the antenna
connection (this does not verify transmitter frequency accuracy).
b.
Another way to check for transmitter output is to hold a common (wooden)
lead pencil tip 1/4 inch to 1/8 inch from the ANT connection. If RF power is
present, a yellowish-white arc will jump from the connector to the pencil tip when
the radio is keyed.
B-7
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