[Premium-Rx] MULTICOUPLER IP2

[nicolas vafiadis]

The current state of the art  for HF multicouplers  is   an input IP2  
of >+95dBm   and an Input IP3 of >+43dBm with a noise figure of <10dB  
in a 1U 19-inch rack format
Using a number of highly balanced amplifiers in the design.
As any intermods in the antenna distribution will degrade any  
following receivers  the receivers are only as good as the antenna  
distribution system.

Nicolas Vafiadis
Director
Web site address: www.commsaudit.com
ISO 9001 registered See Web site for details
Communications Audit UK Limited
PO Box 78
Cheltenham
GL52 6ZU
England



On 1 Apr 2006, at 17:48, Karl-Arne Markström wrote:

> 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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