Mirage B-310-G Manuel utilisateur

Mirage B-310-G Instruction Manual

Mirage B-310-G

The Mirage B-310-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 25O mW

to 8 watts input.

FEATURES

1. High output power of 100 watts

100 watts is achieved with 250 mW to 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 250 mW to 8 watts

With an input power of 8 watts maximum, the Mirage

B-310 -G is 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 weak

stations.

Mirage B-310-G Instruction Manual

SPECIFICATIONS

FREQUENCY : 144 TO 148MHz

RF INPUT : 250 mW - 8 WATTS

RF OUTPUT : 100 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 : 15 AMPS TYPICAL

FUSE : FAST BLOW, 20 AMP

INPUT/OUTPUT IMPEDANCE : 50 OHMS

EXPLANATION OF FEATURES

FRONT PANEL

1. XMIT LED

The XMIT LED indicates the amp is transmitting on the

air.

2. SWR LED

The SWR LED lights when the SWR is to high.

3. PRE-AMP LED

The PRE-AMP LED will illuminate when the pre-amp is

engaged. The pre-amp can be used independently even

if the amplifier's power is off.

4. PWR LED

If the LED 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

circuitry of the amplifier. If the LED is illuminatethen

the amplifier is in the standby mode and will amplify any

signal that is supplied to its input of more than 250 mW.

Mirage B-310-G Instruction Manual

5. MODE (SSB/FM) SWITCH

When in the SSB mode the amplifier will delay the

change over 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.

6. PRE-AMP (ON/OFF) 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.

7. POWER (ON/OFF) SWITCH

When engaged, the amplifier is ready to amplify any

signal applied to its input of the proper frequency.

Mirage B-310-G Instruction Manual

BACK PANEL

8. ANTENNA

The coax from your antenna is connected to thisport.

9. +13.V DC

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-310-G amplifier will accept

voltages of 12 to 15 volts DC.

10. RADIO

The coax from your radio or exciter is connected to

this port.

11. EXTERNAL KEYING

Used to manually key the amplifier relay.

Mirage B-310-G Instruction Manual

INSTALLATION

The Mirage B-310-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 may become very hot.

Mirage B-310-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-310-G Instruction Manual

TROUBLESHOOTING

The Mirage B-310-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. SWR 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-310-G Instruction Manual

B-310-G BOOSTER AMP. BLOCK CIRCUIT

Mirage B-310-G Instruction Manual

SCHEMATIC

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