Re: New version of Receiver Protection Unit


Roger Need
 

The factor not often mentioned in the specs for receiver protection boxes is the OIP2 and OIP3.  In order to do the limiting they all contain some type of non-linear limiting device (diode, saturating transformer etc.) and these generate unwanted spurious signals.  This happens at signal levels well below the maximum output limit spec of 10 to 20 dBm.

The OIP2 and OIP3 two carrier tests will give an indication of what to expect when you use one of these protection devices.  Perhaps Chris will let us know what he measures on his unit.


Roger

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