TRP1000-4450 Troposcatter C-Band Outdoor Amplifier
Revision 0
Introduction
1–6
MN-TRP1000-OD
The M&C also monitors a temperature sensor placed in the outside airstream, to give the user an
indication of the “Outside” or ambient temperature the amplifier is operating in. An alarm is
presented to the user if the outside temperature is 3ºC more than the upper temperarature rating.
The unit will shut down to protect itself if it senses the outside temperature at 6ºC above the rated
upper limit.
The user should install the unit in such a way as to not impede adequate airflow (see Section 2
on Installation) and always operate the unit within the rated temperature specification. The heat
sinks should be regularly cleaned as well to ensure adequate airflow and cooling (see Section 5
on Maintenance).
1.4.6
Important Information on Temperature and RF Overdrive
Read and understand this important section to ensure long time
amplifier reliability.
1.4.6.1
Overview:
The TRP1000-4450 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 will 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.
1.4.6.2
Over Temperature
As stated in the specifications, the amplifier is rated to operate up to ambient temperatures of
60ºC. Operating temperatures beyond this rating may degrade the performance and life of the
amplifier. 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 webpage, where it is labeled Outside Temperature. It is also
reported via the serial RMS command, and has the label of OTEMP. This temperature should be
consistent with the expected ambient temperature in which the unit resides. If it is not, then the
user should try and 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, that all fans are working properly, etc.
If this Outside Temperature sensor is ≥ 63ºC, or other internally monitored temperatures exceed
their threshold (such as the amplifier heat sink temperature, ATEMP>95ºC), 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
≥66ºC or ATEMP
≥66ºC), 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, while the Over Temperature Shutdown fault has a hysteresis of
10ºC).
