Mirage C-2512-G Instruction Manual

C-2512-G Instruction Manual R. F. Amplifier

C-2512-G

R.F. AMPLIFIER

The Mirage C-2512-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-2512­G is capable of FM, SSB, and CW operational modes.

SPECIFICATIONS

Frequency Range...................................................................222 to 225 MHz

R.F. input power (Drive)....................................................... 1 Watt to 40 Watts

R.F. output power.................................................................. 120 watts with

25 Watts drive.

Duty Cycle.............................................................................Intermittent "(I.C.A.S.)"

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 Shut-down point ............................................ 3:1 Approximately

R.F. input Power Shut-down point........................................ 40 Watts Nominal

Temperature Power Shut-down point ...................................175 Degrees F.

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

or remote (external).

Input/Output Impedance........................................................ 50 ohms

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

Remote control connector ..................................................... RCA phono

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

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

power output)

Supply current.......................................................................25 amps (nominal)

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C-2512-G Instruction Manual R. F. Amplifier

Circuit Breaker......................................................................Low voltage, fast blow.

35 amps.

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

Weight...................................................................................5 pounds

INSTALLATION

The Mirage C-2512-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.

The D.C. power leads
must 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 in the
hole on the left side cover near the power supply leads to the "up" position. If desired, the
transmit relay hold-in (hang-time) may be adjusted by adjusting the potentiometer located
behind the slot at the rear on the left side of the amplifier. If external amplifier keying is
desired, a switched ground connection must be provided to the center pin of the RCA
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.

FAULT...................................................................... Indicates amplifier shut-down

due to excessive VSWR,
temperature, or R.F. drive
power.

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