Table of Contents
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Table of Contents
MIRAGE B-215-G RF Amplifier...................................................................................................1
Specifications ..................................................................................................................1
Installation .......................................................................................................................2
Front Panel Switches/LED's ............................................................................................2
Rear Panel Connectors: ..................................................................................................3
Internal Adjustments: ......................................................................................................3
B-215-G Tuning Procedure .............................................................................................3
Setting the Idling Current....................................................................................3
Measurement of Insertion Loss..........................................................................4
Tuning the Amplifier ...........................................................................................4
Setting the Trip Points ........................................................................................5
Adjusting The Receive Preamp..........................................................................6
Troubleshooting:..............................................................................................................7
Technical Assistance ......................................................................................................7
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Summary of Contents for Mirage B-215-G
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Page 1: Table Of Contents
Table of Contents MIRAGE B-215-G RF Amplifier....................1 Specifications ........................1 Installation ........................2 Front Panel Switches/LED's ....................2 Rear Panel Connectors: ....................3 Internal Adjustments: ......................3 B-215-G Tuning Procedure .....................3 Setting the Idling Current..................3 Measurement of Insertion Loss................4 Tuning the Amplifier ...................4 Setting the Trip Points ..................5 Adjusting The Receive Preamp................6... -
Page 3: Mirage B-215-G Rf Amplifier
MIRAGE B-215-G MIRAGE B-215-G RF Amplifier The Mirage B-215-G is an RF power amplifier for 144 - 148 MHz. Features include automatic power shut-down circuitry for protection against high antenna VSWR, high temperature and excessive RF power input. A GaAsFET receive pre-amp provides high gain and low-noise amplification for weak signal applications. -
Page 4: Installation
MIRAGE B-215-G Installation The Mirage B-215-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. -
Page 5: Rear Panel Connectors
These adjustments are made at the factory and should not require field adjustment. B-215-G Tuning Procedure The information contained below is for general information only. You are not required to perform these alignment procedures to make the amplifier operational as they have already been completed at the factory. -
Page 6: Measurement Of Insertion Loss
MIRAGE B-215-G 8. Upon application of power, the initial reading should be approximately .64 amps of current. 9. Locate the driver bias pot, R37, and raise the current 60 to 80 milliamps for a reading of approximately .70 to .72 amps on the meter. -
Page 7: Setting The Trip Points
MIRAGE B-215-G 6. Observe the spectrum analyzer and readjust C65 if any spurs or oscillations are present. 7. Adjust capacitor C39, located on the input side of the driver transistor, Q8, for minimum reflected power on the input meter and maximum output power. -
Page 8: Adjusting The Receive Preamp
MIRAGE B-215-G 3. Next place a 3:1 mismatch dummy load at the output of the amplifier. The shut-down trip point must be set to the most sensitive end of the band. The trip may be adjusted so the circuit just trips at 140 to 152 watts. Adjust the trip by selecting proper diode as shown on print as ZD3, and/or select the proper capacitance C25 across R24, the 62 ohm resistor shown on the pick-up trace. -
Page 9: Troubleshooting
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 You will be best helped if you have your unit, manual and 601-323-8287.