[Premium-Rx] MULTICOUPLER IP2

[Karl-Arne Markström]

The low IP2 value (if it is not a misprint) implies that this multicoupler
does not have balanced amplifier stages internally.

When people connect such a multicoupler to a large wideband antenna,
they are in for an unpleasant surprise.

In order to work in the European RF environment, using wideband gain antennas,
a reasonable IP2 requirement  is + 80 to +85 dBm. This level is representative for
i.a. the Raven Research and R&S NV-14 multicouplers, and leaves the HF receiver IP2 as the
dimensioning factor in the system.

73/

Karl-Arne
SM0AOM



----- Original Message ----- 
From: "Tracey Gardner" <tracey.gardner at talktalk.net>
To: <premium-rx at ml.skirrow.org>
Sent: Saturday, April 01, 2006 6:33 PM
Subject: [Premium-Rx] MULTICOUPLER IP2


> Hi Warren 
> 
> Take a look at this ARRL article
> 
> http://www.arrl.org/tis/info/pdf/020708qex046.pdf
> 
> To quote " In modern receivers, IPs may by quite high. 
> It is not unusual to see receivers with third-order intercept
> points (IP3s) of +30 dBm (1 W) and second-order intercept 
> points (IP2s) of +80 dBm (100 kW). 
> IPs form an excellent basis for comparison of receiver
> distortion performance"
> 
> Looking at that +42dbm in a multicoupler ain't so hot
> 
> Tracey
> 
> > 
> >> In Europe you would not get very happy with an IP2
> >> of +42dBm
> > 
> >  Isn't +42dBMm 15 watts? Do you have more than 15
> > watts of off channel signal into your antenna?
> > 
> > Warren
> > 
> > --- Clemens Paul <cpaul at gmx.net> wrote:
> > 
> >> " 2nd & 3rd Order Intercepts 45 dB & 42 dB " (specs
> >> from 
> >> http://www.testequipmentcanada.com/M-50-8.html.)
> >> 
> >> In Europe you would not get very happy with an IP2
> >> of +42dBm except you are using
> >> very selective narrow banded antennas or additional
> >> preselection before the coupler.
> >> 
> >> Clemens
> >> DL4RAJ
> 
> 
> 
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