Mirage B-34-G Manuale utente

Mirage B-34-G Instruction Manual

Mirage B-34-G

The Mirage B-34-G is a VHF power amplifier designed for

the 144-148 MHz band. New features make it the most

useful and versatile amplifier available for the handheld

transceiver. Features include all mode compatibility

(FM/SSB/CW), wrap-around heat sink, high gain GaAsFET

preamplifier, and 1 to 8 watts input.

FEATURES

1. High output power of 30 to 35 watts.

30 to 35 watts is achieved with 1-8 watts input.

2. All mode compatibility (FM/SSB/CW)

In the SSB mode the time constant of the Carrier

Operated Transmit (COX) relay is set to

approximately

one second to prevent annoying relay chatter

during conversation, and achieving smooth SSB

transmission.

3. Wrap-around heat sink

The heat sink and combined case, by original design

is used for excellent heat dissipation as well as a

new smart appearance.

4. Input power from 1 to 8 watts

With an input power of 8 watts maximum, the Mirage

compatible with most modern handheld transceivers.

5. GaAsFET receive pre-amplifier

A built-in low noise GaAsFET receive pre-amp

enables you to enjoy a more comfortable VHF QSO with

Mirage B-34-G Instruction Manual

weak stations.

Mirage B-34-G Instruction Manual

SPECIFICATIONS

FREQUENCY : 144 TO 148MHz

RF INPUT : 1-8 WATTS

RF OUTPUT : 35 WATTS TYPICAL

DUTY CYCLE : INTERMITTENT

(ICAS)

MODES : FM SSB CW

RECIEVE PRE-AMP : 18db TYPICAL

KEYING : AUTOMATIC SENSING

SUPPLY VOLTAGE : 12-15 VOLTS DC

RF CONNECTORS : TWO (2) SO-239 UHF

SUPPLY CURRENT : 4 AMPS TYPICAL

FUSE : FAST BLOW, 8 AMP

INPUT/OUTPUT IMPEDANCE : 50 OHMS

EXPLANATION OF FEATURES

FRONT PANEL

1. ON AIR PILOT LAMP

The ON AIR pilot lamp indicates the amp is

transmitting

on the air.

2. PRE-AMP PILOT LAMP

The RX pilot lamp will illuminate when the pre-amp is

engaged. The pre-amp can be used independently

even

if the amplifier's power is off.

3. POWER ON PILOT LAMP

If the lamp is in the off position the amplifier will pass

the RF in a straight through mode. This means that

both the receive and transmit signal will bypass the internal

Mirage B-34-G Instruction Manual

circuitry of the amplifier. If the lamp is illuminate then

the amplifier is in the standby mode and will amplify

any

signal that is supplied to its input of more than 1 watt.

Mirage B-34-G Instruction Manual

4. SSB/FM SWITCH

When in the SSB mode the amplifier will delay the

changeover time of the carrier operated transmit relay

to 1 second before disengaging. This will prevent relay

chatter as a result of working SSB or CW. In the FM

mode the relay will operate normally and disengage

once

the transmit signal is dropped.

5. PRE-AMP SWITCH

When engaged the amplifier's pre-amp will be

switched

into the circuit for receive. A sensing circuit will

disengage the pre-amp when a transmitted signal is

applied to the amplifier's input. The pre-amp may

also

work independently if the amplifiers main power

switch is off.

6. POWER ON SWITCH

When engaged, the amplifier is ready to amplify any

signal applied to its input of the proper frequency.

Mirage B-34-G Instruction Manual

BACK PANEL

7. ANT (RF OUTPUT)

The coax from your antenna is connected to this port.

8. RADIO (RF INPUT)

The coax from your radio or exciter is connected to

this port.

9. DC PWR (13.8V)

This port has two wires. The RED wire is for positive

and incorporates a FUSE holder. The BLACK wire is for

negative. The Mirage B-34-G amplifier will accept

voltages of 12 to 15 volts DC.

Mirage B-34-G Instruction Manual

INSTALLATION

The Mirage B-34-G may be mounted using the bracket

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 heat-sink to any surrounding enclosure

and an unobstructed flow from the front to back of the heat-

sink. Do not operate the amplifier in places where it will be

exposed to the direct rays of sun or a nearby heat source

such as heaters, radiators, etc.

CAUTION: With extended use the heat-sink becomes very

hot.

Mirage B-34-G Instruction Manual

Wiring and Operation

If it is necessary to extend the DC power leads use wire of

the

same gauge in order to avoid a voltage drop on your power

leads. Be careful that the DC power supplied is no higher

than 15 volts or damage may result. A source voltage of

13.8 volts is recommended and should be used whenever

available. Some automobiles will generate a high current

surge when started. It is recommended that the amplifier be

place in the off position when starting your vehicle.

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 the best

performance. If used in a mobile installation, choose a good

mobile antenna which will withstand the power of this

amplifier. Be sure to check the SWR for any degrading once

the antenna has been heated by a few minutes of operation.

An antenna with a rating of 100 watts is recommended.

Mirage B-34-G Instruction Manual

TROUBLESHOOTING

The Mirage B-34-G is designed for long, trouble-free

performance and should not require extensive

troubleshooting in the field. If difficulty is encountered, check

the following before assuming the amplifier has malfunction:

1. Loose antenna or power supply connections

2. VSWR of the antenna system

3. Coaxial cables form radio to amplifier, and amplifier to

antenna

4. Output voltage of power supply

5. Power output of radio

6. Improper fuse rating

TECHNICAL ASSISTANCE

If you have any problem with this unit, first check the

appropriate section of this manual. If the manual does not

reference your problem or your problem is not solved by

reading the manual you may call MIRAGE at 601-323-8287.

You will be best helped if you have your unit, manual and all

information on your station handy so you can answer any

questions the technicians may ask.

You can also send questions by FAX to 601-323-6551.

Send a complete description of your problem, an explanation

of exactly how you are using your unit, and a complete

description of your station.

Mirage B-34-G Instruction Manual

B-34-G BOOSTER AMP. BLOCK CIRCUIT

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