L-GaN
Revision 0
Introduction
1–4
The LGaN should be installed in a way which does not impede adequate airflow (see
Chapter 2.
SYSTEM CONNECTORS, INSTALLATION AND STARTUP
), and the unit should always be operated
within its specified temperature range. The LGaN’s heatsinks should also be cleaned regularly to ensure
optimal airflow and cooling performance.
1.3.10
Temperature and RF Overdrive
Read and understand this important section to ensure long time
amplifier reliability.
1.3.10.1
Overview
The LGaN has firmware intended to help the user be more aware of potential over temperature and over
drive conditions that could degrade the reliability of the amplifier. Furthermore, the user can view
recorded maximum and minimum values of important parameters as they have occurred over the
operating history of the unit. These updates are explained below.
1.3.10.2
Over Temperature
Chapter 4. ETHERNET INTERFACE OPERATION, Section 4.5.4.2, Status | Status
Operating the LGaN beyond its specified temperature rating may degrade the performance and life of the
unit. The unit has an internal sensor that monitors the temperature of the airflow across the cooling fans
and is very close to the actual ambient or outside temperature. This temperature can be monitored on the
Status | Status
webpage. It is also reported via the serial RMS command, and has the label of Outside
Temperature (OTEMP). This temperature should be consistent with the expected ambient temperature in
which the unit resides. If it is not, then the user should ensure that there are no obstructions blocking the
cool air inlet or recirculating the hot air exhaust of the unit back into the inlet, that there is adequate
clearance around the cool air inlet and exhaust areas, and that all fans are working properly, etc.
If the ambient temperature is measured at least 3ºC (37.4°F) above the specified rating, or other internally
monitored temperatures exceed their threshold (such as the amplifier heat sink temperature,
ATEMP>95ºC (203°F)), an alarm or fault will be declared. The unit will not shut down, but the condition
causing the elevated temperature should be promptly remedied. If temperatures continue to rise (Outside
Temp ≥6ºC
(42.8°F)
above rated, or ATEMP ≥96ºC
(204.8°F)), the unit will declare an Over Temperature
Shutdown fault and will turn off the power supplies to the critical RF transistors for protection purposes.
(The Amplifier/Outside Temperature Alarm has a hysteresis of 5ºC (41°F), while the Over Temperature
Shutdown fault has a hysteresis of 10ºC (50°F)).
Summary of Contents for LGAN
Page 22: ...L GaN Revision 0 Introduction 1 8 Figure 1 4 LGaN 50 W Dimensional Envelope 2 of 2...
Page 24: ...L GaN Revision 0 Introduction 1 10 Figure 1 6 LGaN 100 W Ku Band Dimensional Envelope 2 of 2...
Page 36: ...LGaN Revision 0 System Connectors Installation and Startup 2 12 MN LGAN BLANK PAGE...
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Page 118: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...
