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Topic ClosedIF Equipment - Satellite Ground Station Components

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Direct Link To This Post Topic: IF Equipment - Satellite Ground Station Components
    Posted: 07/August/2015 at 22:50
IF Equipment - Satellite Ground Station Components
In these tutorials we will look at the various component parts that make up a satellite ground station and the typical practices that engineers employ during satellite ground station engineering projects.

Intermediate Frequency (IF) Equipment

Attenuators and Amplifiers
For balancing the levels through the transmit or receive chain the signal may require amplification or attenuation. Amplifiers increase the level by defined amounts typically up to 30dB and the attenuators decrease the level in defined amounts.

Splitters & Combiners
With multiple modulators and demodulators or modems, the signals all need to be either combined in the transmit path and split in the receive path in order to be connected to a single transmit cable or receive cable. The method of doing so is by using splitter sand combiners which are available in various sizes from 2:1 to 32:1. In other words 2 inputs combined into 1 output or 1 input split into 2 outputs.

Patch Panels & Matrix Switches
In order to connect the IF Modulators and Demodulators to the Up and Down Converters or the BUCs and LNBs, a system of patching is required which can be a simple patch panel which allows linking manually each input to output or a remotely controllable matrix switching system that removes the manual process and allows for automated switching.
Both patch panels and matrix switches have splitters and combiners built in that allow connection of many inputs to a few outputs and visa versa.

Fibre Optics
Connecting modems located in an equipment rack within a communications building to a new antenna located many metres away using standard coax cables or even low loss cables will always result in loss of signal due to the attenuation of the cables. The longer the cables the more loss is encountered.

To resolve this there are now fibre optic links that can carry L Band IF signals over very long distances with virtually no loss of signal level and no increase in noise. The fibre optic units are usually rack mounted chassis which convert the coaxial L Band signals to fibre optic and back again.

In the next Tutorial we will look at the Baseband Equipment.

Edited by Satcoms UK - 30/August/2015 at 22:40
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