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Third-order intercept or IP3


alenK

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Hello,

 I have been reading the Lectrosonics SRc vs UCR411s threads and have been learning a bit about how they are different.

 I see in the specs that the Third-order intercept specifications seem very different

UCR411a  = +8dBm

SRc           =   0dBm

and after reading a Lectro white paper I see the following:

IP3 Receiver Performance

   -5 dBm OK when operating in a clear spectrum

    0 dBm Good for moderately congested spectrum

  +5 dBm Will tolerate fairly high levels of interference from external sources

+10 dBm Excellent performance in almost any RF congested environment

 

I am hoping to gain a better understanding of the terms "moderately congested" and "high levels of congestion". 

I currently own UCR210 receivers and am surprised to realize that they have a IP3 spec of +12dBm.

I routinely operate corporate owned UCR411a receivers with the +8dBm spec.

How will a SRc with a 0dBm spec compare in real world use? Are there other factors that offset the need for a high IP3 rating?

Thank you.

 

   

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Narrow band receivers allow filters which are more precise. That's physics. But today everybody wants and needs universal broadband receivers - that's why an old UCR210 or Sennheiser 3041 for example will probably perform better in that category.

But newer receivers often perform better in precise tuning, so "it depends" if they will really do a worse job in RF crowded situations.

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