General question about LNBs

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26YANKEE

Thread Starter
New Member
Jun 12, 2008
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I spent 4 years in the Army as a Satellite equipment repair technician. Back in those days we used a LNA, which was a cryogenically cooled low noise parametric amplifier up in the antenna equipment room, then the signal was sent down to the main building to a down converter, and so on.

Now, I understand that an LNB is a Block...including the LNA and the downconverter, but what I don't understand is how is the low noise figure is achieved in the LNB without the cryogenic cooling.

Can anyone provide more detail on that?
 
berck

berck

SatelliteGuys Pro
Jan 18, 2006
829
5
Pleasanton, CA (SF Bay Area)
Wikipedia is a good source...

The “low-noise” part means that special electronic engineering techniques are used, that the amplification and mixing takes place before cable attenuation and that the block is free of additional electronics like a power supply or a digital receiver. This all leads to a signal which has less noise (unwanted signals) on the output than would be possible with less stringent engineering.

I suspect the LNA's used in the Army are for detecting very weak signal and hence, are much more powerful than those in the LNB.
 

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