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[TowerTalk] Third Order Intercept

Subject: [TowerTalk] Third Order Intercept
From: Tony <>
Date: Thu, 25 Jan 2007 20:17:51 -0500
List-post: <>
Greetings all:

Have a question about third order intercept point. I understand the 
measurement takes sensitivity into account at the point were IMD products 
start to show at the noise floor; the greater the sensitivity is before 
distortion shows up the better.

If that's the case, then a good TOI figure alone doesn't tell the whole 
story. If the sensitivity isn't in the useable range for most HF work (-110 
~ 130dbm or so) then the receiver will have good IMD rejection, but would be 
somewhat deaf compared to one with greater sensitivity.

It would be similar to adding attenuation to improve the TOI by making the 
rig less sensitive; a 10db attenuator might cause the TOI improve by 10db. 
Would this be an accurate interpretation of the TOI measurement?

Tony KT2Q



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