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AWMA-Kx500-BTE
The SSPA continually monitors the internal temperature and the current consumption. It also has
an automatic shutdown feature to prevent operation at excessive temperatures. The unit will
automatically restart when the hotspot temperature falls below to 65°C.
A thermal alarm may result from any one of the following conditions:
1. High ambient temperature (the SSPA Amplifier is designed to operate between -30
°
C and
+55°C ambient).
2. Blockage at the air intake or exhaust vents.
4.3.5.2 MUTE Control
The user can disable the RF output power remotely by:
1. Leaving unconnected pins G and H of the Relay interface connector the Transmit way will be
MUTE (see
2. Sending a mute command in terminal mode through the RS-232 interface for transmit.
3. Sending a mute command in packet mode through the RS-485 interface for transmit.
This feature is useful if the user wishes to perform a maintenance check or to check out the
transmission system. Note that when the unit is in MUTE, the Tx LED is red flashing.
4.3.6 P
OWER
S
UPPLY
The Power Supply consists of two identical, 2000 W Power Supply modules. Each module can
supply outputs as follows:
•
3 x 25 A @ + 12 VDC,
•
3 x 0.1 A @ - 9 VDC,
•
1 x 0.3 A @ +15 VDC,
The power supply portion of the SSPA provides all of the internal voltages necessary to operate the
RF section, the forced air cooling system and the Monitor and Control board.
The power supply is configured to operate from an 180-264 VAC, 47-63 Hz, single phase
supply
. The overall typical power consumption, at the rated RF output power, is approximately
4000 W (for one unit).
The cooling fans are supplied from the main power supply with a variable voltage (temperature
dependent) between 0 and 48 V DC.
4.3.7 C
URRENT
S
ENSOR
The Current Sensor Assembly generates a voltage signal proportional with the 12 VDC high current
delivered by the main power supply to the RF modules. This signal is delivered to the Main Control
Board for DC current consumption monitoring.
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