Icom IC-551D Instruction Manual page 8

contacts using a tape recorder connected to the headphones jack. With а 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 connection 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, ТУІ, BCI 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.