X-GM-THRID: 1216834850274043359 X-Gmail-Labels: rsgb lf X-Gmail-Received: 1bf5a9b6984098ff8a205eae429d4be402df1da6 Delivered-To: daveyxm@gmail.com Received: by 10.78.205.5 with SMTP id c5cs8069hug; Tue, 10 Oct 2006 00:09:04 -0700 (PDT) Received: by 10.66.244.10 with SMTP id r10mr7889108ugh; Tue, 10 Oct 2006 00:09:04 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 27si503052ugp.2006.10.10.00.09.03; Tue, 10 Oct 2006 00:09:04 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1GXBf5-0001Ek-EG for rs_out_1@blacksheep.org; Tue, 10 Oct 2006 08:04:23 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GXBf4-0001Eb-Vp for rsgb_lf_group@blacksheep.org; Tue, 10 Oct 2006 08:04:22 +0100 Received: from relay.dera.gov.uk ([192.5.29.49] helo=relay.dstl.gov.uk) by relay1.thorcom.net with smtp (Exim 4.62) (envelope-from ) id 1GXBf1-0005Ye-62 for rsgb_lf_group@blacksheep.org; Tue, 10 Oct 2006 08:04:22 +0100 Received: (qmail 18461 invoked from network); 10 Oct 2006 08:04:08 +0100 Received: from warlock.dstl.gov.uk (192.5.29.10) by relay.dera.gov.uk with SMTP; 10 Oct 2006 08:04:08 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803D06EFE514@mail.dstl.gov.uk> From: Talbot Andrew To: rsgb_lf_group@blacksheep.org Date: Tue, 10 Oct 2006 08:04:12 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,AWL=0.540,FORGED_RCVD_HELO=0.05 Subject: LF: RE: Re: Re: erp eirp - bluff Content-Type: text/plain X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Status: O X-Status: X-Keywords: X-UID: 5302 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" To: 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 > > "This e-mail is intended for the recipient only. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely upon this e-mail. If an addressing or transmission error has misdirected this e-mail, please notify the author by replying to this e-mail." "Recipients should note that all e-mail traffic on MOD systems is subject to monitoring and auditing."