Advantech Wireless SSPBM-K150-BRE, Инструкция по установке и эксплуатации

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4.3.1 L-B
AND TO
K
U
-B
AND
U
P
-C
ONVERTER
M
ODULE
The L/Ku-Band Up-Converter Module converts and amplifies the incoming L-Band carrier
into the desired Ku-Band carrier.
The module has an internal synthesizer, which is fixed at 2175 MHz (virtual 13050 MHz).
The up-converter module has RS-485 communication port that connects to the main controller
board. It also provides a discrete ALARM signal to the Main Controller.
The Up-Converter converts the input L-Band carrier into a Ku-Band carrier. The 950 – 1450 MHz
L-Band input signals are fed at the input co-axial interface connector. Note that this unit has an
internal 10 MHz internal reference. The unit will work based on this internal 10 MHz reference. A
block up-converter using a low phase noise RF oscillator, which is phase locked to the 10 MHz
reference, translates the 950 - 14500 MHz L-Band frequency-range to 14.000 - 14.500 GHz Ku-
Band frequencies. A band-pass filter selects the appropriate up-converter term, which in turn drives
a Solid State Power Amplifier (SSPA). Integral to this module there is a variable attenuation
section used for global temperature compensation.
4.3.2 P
OWER
A
MPLIFIER
M
ODULE
The
Power Amplifier Module amplifies the RF signals from the L/Ku-Band
up-converter module over the frequency range of 14000 MHz to 14500 MHz. The power
amplifier has a fixed gain of 55 dB, typical.
The monitoring and control signals are the Alarm Output and the Relay Input for muting the
power amplifier.
Temperature sensors are installed at the module’s hot spots to prevent the RF devices from
overheating and operating at temperatures exceeding 85ºC.
The power amplifier also has the following functions:
1. Provides and removes the DC voltages to the GaAs FET devices within the module.
2. Provides a temperature dependent DC voltage to the L-C up-converter for temperature
compensation.
3. Sends a FAULT signal to the main controller board when detecting a fault.
4. Any Synthesizer is out of lock
The power amplifier will be in the Mute mode if:
1. The user sends a MUTE command through the Relay, RS-232, or RS-485 interfaces.
2. The hot spot temperature e85
°
C.
3. Any of the GaAs FET devices failed (drain current out of range).
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