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From: "captbrian" <captbrian@ukonline.co.uk>
To: <rsgb_lf_group@blacksheep.org>
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Date: Sun, 8 Oct 2006 20:00:42 +0100
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Subject: Re: LF: Re: erp ierp VY1JA
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Well I always thought  there was a large loss depending on the extent to
which polarisation differed between emitter and recvr.?

This is from qsl.net: :-.......

Notes

Polarization Mismatch Loss (dB) = 20 * log10(cos D)  Where D is the
misalignment angle between the two antennas.

Polarization Mismatch Between Two Linearly Polarized Waves as a Function of
Angular Orientation

Orientation Angle          Polarization Mismatch (dB)

0.0 (aligned)              0.0
15.0                       0.3
30.0                       1.3
45.0                       3.0
60.0                       6.0
75.0                       12.0
90.0 (orthogonal)          infinite (real world varies 20-35 dB)

bryan


----- Original Message -----
From: "Rik Strobbe" <Rik.Strobbe@fys.kuleuven.be>
To: <rsgb_lf_group@blacksheep.org>
Sent: 07 October 2006 16:33
Subject: Re: LF: Re: erp ierp VY1JA


> Hello Bryan,
>
> > thank you ........and is this comparison half-wave antenna vertical or
> > horizontal ?  Are there limits about how far away is the 'notional
> > measuring' position .
>
> The reference antennas for ERP and EIRP are considered to be in free
> space, polarisation does not matter.
> The reference antenna for EMRP is considered to be over a perfect ground.
>
> 73, Rik
>
> >
>
>
> Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>
>
>