Icom IC-230 Instruction Manual page 3

SECTION ІІ - DESCRIPTION
This transceiver employs a Phase Locked Loop Synthesizer which is capable of 30 kHz spaced
full coverange operation between 146 MHz to 148 MHz. In addition, the transmit frequency
may be increased or decreased by 600 KHz on each channel for use with repeators. The IC-230
is extremely rugged and completely solid state.
State of the art devices such as Integrated Circuits, Field Effect Transistors, varactor and zener
diodes are engineered into a tight knit straight forward electronic design throughout both
transmitter, and receiver. Reliability, low current demand, compactness, unexelled performance
and ease of operation are the net result.
The dual conversion reciever with its FET front end and high-Q helicalized cavity resonators
boasts low noise and sensitivity of 0.4 ХУ, or less. Signal gain of 90 db or more is accomplished
from the second mixer back by virtue of a 6 stage IF amplifier. The need for additional front end
RF amplification is thus eliminated. A zener regulated crystal-controlled first and second local
oscillators produce unmatched stablity. Audio reproduction is of an unusally high order of
distortion free clarity.
The transmitter section will produce a minimum of 10 watts RF output. High-Q and shielded
stages provide minimum interstage spurious response. An encased low pass filter is placed at the
output to further insure undesirable frequency products are not emitted. An ingenious final
PA transistor protection device, (APC), is incorporated in the final output circuitry. A tiny
VSWR bridge and four DC amplifier constantly monitor the output for high VSWR, a shorted or
absent antenna load, or other difficulty that would cause irreparable final transistor damage
Should these difficulties occur, the APC instantaneously disables the final PA without damage.
All circuitry is constructed in a series of modules which are easily removable for servicing. The `
modules are housed in a sturdy aluminum frame, which is, in turn, housed in a rigid metal case,
providing an extremely durable and rugged unit. Great care has been taken to filter and regulate
internal DC voltages. A DC input filter is provided to eliminate alternator or generator "whine"
when used in a vehicle. Test points are brought up from all major circuits to facilitate maintenance
checks and trouble shooting should the necessity arise.
A modern styled face plate, large 5 meter, small size and low profile design complete the unit's
styling. The 1C-230 is a welcome addition to any automoble or fixed station.
SECTION Ill - INSTALLATION
3.1 Unpacking:
Carefully remove your transceiver from the packing carton and examine it for signs of
damage. Should any damage be apparent, notify the delivering carrier or dealer
immediately, stating the full extent of the damage. It is recommended you keep the
shipping cartons. In the event storage, moving or reshipment becomes necessary, they
come in handy. Accessory handware, cables, etc., are packed with the transceiver. Make
sure you have not overlooked anything.
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