[TowerTalk] Third Order Intercept

[Tony]

Steve,

> Umm, this is TowerTalk - not ReceiverTalk. There are other more 
> appropriate >places for this discussion to take place. OTOH if you want to 
> talk about tower >and HF antenna construction questions, TT is definitely 
> the place. Tnx.
>Cheers, Steve    K7LXC

Your right; realized I was on the wrong reflector after I sent the post.
My apologies.

Tony KT2Q



-- Original Message ----- 
From: K7LXC at aol.com
To: dxdx at optonline.net
Sent: Friday, January 26, 2007 5:43 AM
Subject: Re: [TowerTalk] Third Order Intercept


In a message dated 1/25/2007 8:43:56 P.M. Central America Standard T, 
towertalk-request at contesting.com writes:
>  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?

    Umm, this is TowerTalk - not ReceiverTalk. There are other more 
appropriate places for this discussion to take place. OTOH if you want to 
talk about tower and HF antenna construction questions, TT is definitely the 
place. Tnx.

Cheers,
Steve    K7LXC
TT ADMIN