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Message-ID: <00a301c6ec53$d54be780$721686d4@captbrian>
From: "captbrian" <captbrian@ukonline.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <7D653C9C42F5D411A27C00508BF8803D06EFE514@mail.dstl.gov.uk>
Date: Tue, 10 Oct 2006 11:06:04 +0100
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Subject: LF: Re: RE: Re: Re: erp eirp - bluff
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Aha I wasn't so stupid then.....
Now ,  you asked for this.......what is the polarity of an   'isotropic '
radiator .?

Bryan
----- Original Message -----
From: "Talbot Andrew" <ACTALBOT@mail.dstl.gov.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: 10 October 2006 08:04
Subject: LF: RE: Re: Re: erp eirp - bluff


> It should be, but the 'rule makers' way-back-when in their infinite wisdom
> decided that dipoles were easier for the humdrum public to visualise so
> defined ERP as being relative to a perfect dipole.
>
> As it is difficult to make dipoles at high frequencies (actually it is a
lot
> wasier easier, but... Never mind) ERP there was defined as being relative
to
> isotropic.  So...
>
> Below 1000MHz ERP is defined as being realitive to a dipole, above 1GHz
ERP
> is defines as being the same as EIRP.
>
> Its just a matter of semantics.  I fell into this trap and queried the ERP
> limits when 50MHz was first introduced several decades ago.  50MHz
requires
> EDRP, so the actual maximum RF power could be more than would be needed
for
> an isotrope.
>
> Andy  G4JNT/G8IMR (still lurking)
>
>
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of captbrian
> Sent: 10 October 2006 03:13
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: Re: Re: erp eirp - bluff
>
> Then why isn't ERP called  EDRP ?
>
> eg  EIRP, EMRP, EDRP ......s'obvious innit.?
>
>
> ----- Original Message -----
> From: "James Moritz" <james.moritz@btopenworld.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: 09 October 2006 21:56
> Subject: LF: Re: erp ierp - bluff
>
>
> > Dear Bryan, LF Group,
> >
> > >< snip >>
>
> > Cheers, Jim Moritz
> > 73 de M0BMU
> >
> > (BTW, it is EIRP, not ierp)
> >
> >
> >
> >
> > > G3GVB/ Bryan
> > >
>
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