Icom IC-211 Instruction Manual page 8

HEADPHONES
Any good headphone set, including stereo type, that has 4 — 16 ohms impedance can be
used. With the plug inserted halfway into the PHONES jack, both the headphones and
speaker will operate. This is convenient when others wish to listen in on the station, or you
wish to record contacts using a tape recorder connected to the headphones jack. With a
stereo headphone set inserted this way, however, the headphones will lose the sound on one
side. With the plug inserted completely, only the headphones work.
MICROPHONE
A high quality dynamic microphone is supplied with your transceiver. Merely plug it into
the proper receptacle on the front panel. Should you wish to use a different microphone,
make certain it is approximately 600 ohms. Particular care should be excercised in wiring
also, as the internal electronic switching system is dependent upon it. See the schematic
for the proper hook up.
Microphone plug exploded view Microphone connection
Microphone
(cord side view)
CW KEY
When operating CW, connect the Key to the Key Jack with the plug supplied. The con-
nection of the plug is shown below.
If the terminals have polarity, be sure to make the correct connection. Note that the keyed
voltage when switching with semiconductors or relays with resistors in the circuit, should be
adjusted to be below 0.4 Volts!
Key Wiring Diagram
GROUND
In order to prevent electrical shocks, TVI, ВС! and other problems, be sure to connect a
heavy wire ground, as short as possible, from a good earth point to the ground terminal on
the rear panel.