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AE04B-A0279 Rev --
3.2.3.3 Synthesizer
The synthesizer board consists of a synthesizer circuit that is driven by a reference oscillator and distribution
amplifiers. The synthesizer operating frequency is programmed from the status and control module. The
uplink and downlink frequencies are set with a computer that has Andrew designed frequency control
software installed on it. This software is a Microsoft® Windows™ application that allows the operator to
input the desired RF frequency and gain setting.
The status and control module converts the operator's input to the appropriate frequency command for the
synthesizer. The output of the synthesizer is split to the downconverter mixer and upconverter mixer.
3.2.4
Power Supply
The power supply assembly consists of an in-line EMI filter, switching power supply, and interface cable.
The power supply accepts a 90 to 264 VAC input and outputs +15 VDC for use by the rest of the amplifier.
Power is distributed to the active modules through the interconnect board.
3.2.5
Power Amplifier Modules
The downlink power amplifier module provides 45 dB of final gain and is J-STD-008 compliant up to 10
Watts output. The uplink power amplifer module has 27 dB of gain and is J-STD-008 compliant up to 1
Watt output. A thermal sensor mounted on the heatsink monitors the total heat dissipation of the power
amplifers.
3.2.6
Interconnect Board
The interconnect board distributes power to the other modules, and provides status information and control
capabilities at the local and remote connections. Control functions include synthesizer channel selection and
individual channel attenuation settings. Status information includes module summary status for the
LNA/attenuators, channelizers, power amplifiers and battery backup.
3.2.7
Battery Back Up Option
The battery back up (BBU) provides emergency operating power in case of AC power loss. Under normal
conditions, the BBU is charged by an internal charger. If AC power loss occurs, the BBU automatically
comes on-line and this condition is reported to the status and control module. The BBU has been sized for
back up capability over the full –40º to +60ºC tempe rature range and will power the repeater for
approximately two hours when ambient temperature is –40ºC. Actual back up time will increase with
warmer temperatures.
3.2.8
Mounting Kit Options
A mounting kit (EENCL-90004) is available for ease of installation on walls or poles. Refer to Appendix A
for installation instructions.
Document use is restricted to that described on cover
FUNCTIONAL DESCRIPTION
3-3
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