Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id C3D28380000AE; Sat, 3 Mar 2012 20:24:19 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1S40AK-0003N7-On for rs_out_1@blacksheep.org; Sun, 04 Mar 2012 01:23:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1S40AK-0003My-6d for rsgb_lf_group@blacksheep.org; Sun, 04 Mar 2012 01:23:12 +0000 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1S40AI-0008BD-PN for rsgb_lf_group@blacksheep.org; Sun, 04 Mar 2012 01:23:12 +0000 Received: from AGB ([2.26.29.167]) by mwinf5d69 with ME id hDP51i0023cL6BE03DP51J; Sun, 04 Mar 2012 02:23:05 +0100 Message-ID: From: "Graham" To: References: <12959492286D45E9BB24E80CE57644CD@AGB> <4F52C0BB.3010505@iup.uni-heidelberg.de> In-Reply-To: <4F52C0BB.3010505@iup.uni-heidelberg.de> Date: Sun, 4 Mar 2012 01:23:04 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 120303-1, 03/03/2012), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: Permissible QSY limits for 136 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0255_01CCF9A5.59469620" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:474438464:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61894f52c4432308 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0255_01CCF9A5.59469620 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks' Stefan, . bit late in the night =20 50 ? That's quite low , I was expecting much higher ? that's = for a 'large' system ? do you have a ball park figure for the = max frequency change on that ?=20 1:1.5 > 5% reflected power , that would reduce the b/w again .. Tnx -G.. From: Stefan Sch=E4fer=20 Sent: Sunday, March 04, 2012 1:09 AM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Permissible QSY limits for 136 Am 04.03.2012 02:01, schrieb Graham:=20 Permissible QSY limits for 136=20 Q what is the average Q of a 136 Khz Ae system ? (back = garden + larger) Maybe arround 50. Q What would the maximum acceptable change in frequency +/- Fo = before swr considerations became a problem , say 10% reflected = power 1 :2 swr ? .... That depends strongly on the PA circuit. A class E is very critical. A H = bridge has almost no problems at all (just lower output power then). I = would stay below 1:1.5 if the output power is 70% or above. 73, Stefan ------=_NextPart_000_0255_01CCF9A5.59469620 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks' Stefan, . bit late in the = night =20

50 ? That's quite low , I = was =20 expecting much higher ? that's for a = 'large' system ? do you have a ball = park=20 figure for the max frequency change = on=20 that ?

1:1.5 > 5% reflected power , that =20 would reduce the b/w again ..

Tnx -G..

From: Stefan = Sch=E4fer

Sent: Sunday, March 04, 2012 1:09 AM

To: rsgb_lf_group@blacksheep.org= =20

Subject: Re: LF: Permissible QSY limits for = 136

Am 04.03.2012 02:01, schrieb Graham:=20

Permissible QSY limits for 136

Q what is the average Q of =20 a 136 Khz Ae system ? (back garden = +=20 larger)

Maybe arround 50.

Q What would the maximum acceptable = change =20 in frequency +/- Fo before = swr =20 considerations became a problem , say 10% =20 reflected power 1 :2 swr ? = ....

That depends=20 strongly on the PA circuit. A class E is very critical. A H bridge has = almost no=20 problems at all (just lower output power then). I would stay below 1:1.5 = if the=20 output power is 70% or above.

73, Stefan

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