Mirage C-211-G Instruction Manual

C-211-G Instruction Manual R. F. Amplifier

C-211-G

R.F. AMPLIFIER

The Mirage C-211-G is the next generation of Power Amplifiers for 222 - 225 MHz.
New features make it the most useful and versatile amplifier available. Features include
automatic power shut-down circuitry for protection against high antenna VSWR, high
temperature and excessive R.F. power input. A newly designed GaAsFET receive pre­amp provides high gain and low noise amplification for weak signal applications. The
pre-amp includes an attenuator to reduce signal output level. This is useful in preventing
Receiver Overload and subsequent Intermodulation Distortion caused by strong signals.
Provision is made for automatic or remote (external) keying, and for remote control of all
front panel functions using the Mirage RC-1 Remote Control Unit. The Mirage C-211-G
is capable of FM, SSB, and CW operational modes.

SPECIFICATIONS

Frequency Range...................................................................222 - 225 MHz

R.F. Input Power (Drive).......................................................250 mW to 5 Watts

R.F. Output Power................................................................. 110 Watts with 2 Watts drive

Duty Cycle.............................................................................Intermittent (ICAS)

Modes.................................................................................... FM, SSB, CW

Receive Pre-amp ...................................................................GaAsFET, Gain 21/15 dB-

Nominal. Noise figures less
than 0.6 dB. 1 dB
compression point greater
than -13 dBm input

(Nominal)

VSWR Power Shutdown Point ............................................. 3:1 Approximately

R.F. Input Power Shutdown Point.........................................5 Watts nominal

Temperature Power Shutdown Point..................................... 175 degrees F.

Keying...................................................................................Automatic (R.F. sensing) or

remote (external)

Input/Output Impedance........................................................ 50 Ohms

R.F. Connectors..................................................................... SO-239 (UHF)

Remote keying connector......................................................RCA phono

Remote control connector ..................................................... 6 pin Molex

Supply Voltage......................................................................13.8 VDC (for full R.F.

power output)

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C-211-G Instruction Manual R. F. Amplifier

Supply Current ...................................................................... 25 Amps (nominal)

Fuse ....................................................................................... Low voltage, fast blow.

35 Amps

Physical Dimensions.............................................................12 x 3 x 5-1/2 inches

Weight...................................................................................5 lbs.

INSTALLATION

The Mirage C-211-G may be mounted using the brackets supplied or simply placed in a
convenient operating position. In either case, there must be adequate ventilation for the
finned heat-sink. This generally means at least 1 inch clearance from the sink to any
surrounding enclosure and an unobstructed flow from the front to the back of the sink.
CAUTION: With extended use the heat sink becomes very hot. If it is necessary to
extend the D.C. power leads use a minimum #8 gauge wire. Use a minimum length of
good quality 50 Ohm cable between the radio and the amplifier. The antenna system
should have a VSWR of 1.5:1 or better for best performance. The receiving pre-amp gain
is set to the high value at the factory. To switch to minimum gain move the DIP switch,
which is located under the left side cover near the power supply leads, in the "up"
position. The switch may be accessed through the fourth slot from the rear using an
appropriate small tool. If desired, the transmit relay hold-in (hang-time) may be adjusted
by adjusting the potentiometer located behind the twelfth slot from the rear on the right
side of the amplifier. If external amplifier keying is desired, a switched ground
connection must be provided to the center pin of the RCA phono jack.

FRONT PANEL SWITCHES/LED'S

POWER ON/OFF SWITCH ..................................... Turns the D.C. power ON or

OFF.

SSB/FM SWITCH.....................................................Selects relay time delay for

the mode of operation. The

relay drop time is lengthened

for the SSB mode of

operation.

PRE-AMP ON/OFF SWITCH.................................. Turns Pre-amp power ON or

OFF.

POWER LED............................................................Indicates that D.C. power is

applied.

PRE-AMP LED......................................................... Indicates that the pre-amp is

turned on.

TX LED.....................................................................Indicates that the amplifier is

keyed on.

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