Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk02.r1000.mx.aol.com (Internet Inbound) with ESMTP id EF6EC3800011F; Fri, 12 Aug 2011 17:06:21 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QryuY-0006lO-43 for rs_out_1@blacksheep.org; Fri, 12 Aug 2011 22:04:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QryuX-0006lF-36 for rsgb_lf_group@blacksheep.org; Fri, 12 Aug 2011 22:04:57 +0100 Received: from mail-wy0-f171.google.com ([74.125.82.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QryuV-00014V-KT for rsgb_lf_group@blacksheep.org; Fri, 12 Aug 2011 22:04:57 +0100 Received: by wyh13 with SMTP id 13so3872263wyh.16 for ; Fri, 12 Aug 2011 14:04:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:from:to:references:in-reply-to:subject:date:mime-version :content-type:x-priority:x-msmail-priority:importance:x-mailer :x-mimeole; bh=NBKmP28Hcefo3qWIO09TrKrdjBZ+Aou1BvbBJ3wvpq8=; b=a2hOuY0MI3xVJIneXfzsfrIU/rVIq14swEl2SHfJUMbv3VWZ6EiJabIAE+TirRV47C bfh9Afjj2K/wWmIqlinsIH5QFHJDM1zoNwXDjIChGdk3vTQWm+3x76VRxJ/aJ4ESCyeq uqJojLIvMAL7P82BgrdSpSvNcJjhGcUYCWUAE= Received: by 10.227.32.136 with SMTP id c8mr1259765wbd.7.1313183089426; Fri, 12 Aug 2011 14:04:49 -0700 (PDT) Received: from PcMinto (h50208.upc-h.chello.nl [62.194.50.208]) by mx.google.com with ESMTPS id ff6sm2615641wbb.15.2011.08.12.14.04.46 (version=SSLv3 cipher=OTHER); Fri, 12 Aug 2011 14:04:48 -0700 (PDT) Message-ID: <98AAEDE9D7B74E7E9F5CBF197D403E08@PcMinto> From: Minto Witteveen To: References: <4E4527EF.2000304@iup.uni-heidelberg.de> <52970A62D1224CAF9A966D1743DCBF00@PcMinto> <4E456AB7.6090403@iup.uni-heidelberg.de> <007801cc591c$a2affa60$0401a8c0@xphd97xgq27nyf> In-Reply-To: <007801cc591c$a2affa60$0401a8c0@xphd97xgq27nyf> Date: Fri, 12 Aug 2011 23:04:40 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3538.513 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3538.513 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: PA3BCA Content-Type: multipart/alternative; boundary="----=_NextPart_000_0161_01CC5944.37022F40" 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: 0:2:466015776:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m221.2 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d61864e4595cd7192 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_0161_01CC5944.37022F40 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 0.5 mH, nice! According to my measurements I will need a 3.5 mH loading coil, your 0.5 = is just a bit more than I need at 500 KHz=E2=80=A6 73=E2=80=99s, Minto pa3bca -------------------------------------------------------------------------= - Ceterum censeo Carthaginem delendam esse From: mal hamilton=20 Sent: Friday, August 12, 2011 20:21 To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: PA3BCA My loading coil is 0.5 mH approx wound with 3mm litz wire, it has no = cover just a glass lid on top. Air and rain circulates around it to keep = it cool and weather changes has little effect ie sunshine or showers, = even during stormy windy wx there is very little loading variations.=20 If you have a large loading coil and short antenna wires circumstances = could be different.=20 g3kev ----- Original Message -----=20 From: Stefan Sch=C3=A4fer=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, August 12, 2011 7:02 PM Subject: Re: LF: PA3BCA Hi Minto, Am 12.08.2011 19:42, schrieb Minto Witteveen:=20 How much power were you generating? 73=E2=80=99s, Minto pa3bca It changes all the time. Not even sure since i just have an E field = probe to decouple some power from my TX antenna and feed it to a 50 uA = amperemeter, shunted by a potentiometer. This poti was adjusted to show = 100% full scale when using 120 W RF before some weeks. Now reduced the = parallel R on the poti so it shows just 25 uA then. Got 50 uA anyway by = QRO and more (not sure). So it should be arround 500W. This is -6 dBfs = :-) But the antenna, i.e. the coil and its cover is very lossy it seems. = When there was rain, i have up to twice the losses :-( Need to search = for an alternative cover (mustn't burn, so a water barrel is no = alternative...). 73, Stefan/DK7FC ------=_NextPart_000_0161_01CC5944.37022F40 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

0.5 mH, nice!
According to my measurements I will need = a 3.5 mH=20 loading coil, your 0.5 is just a bit more than I need at 500=20 KHz=E2=80=A6

73=E2=80=99s, Minto = pa3bca

 
-------------------------------------------------------------------= -------
Ceterum=20 censeo Carthaginem delendam esse
 
Sent: Friday, August 12, 2011 20:21
Subject: Re: LF: PA3BCA
 
My loading coil is 0.5 mH approx wound with 3mm = litz wire,=20 it has no cover just a glass lid on top. Air and rain circulates around = it to=20 keep it cool and weather changes has little effect ie sunshine or = showers, even=20 during stormy windy wx there is very little loading variations. =
If you have a large loading coil and short = antenna wires=20 circumstances could be different.
g3kev
 
 
----- Original Message -----
From:=20 Stefan = Sch=C3=A4fer
Sent: Friday, August 12, 2011 = 7:02=20 PM
Subject: Re: LF: PA3BCA
 
Hi Minto,

Am 12.08.2011 19:42, schrieb Minto=20 Witteveen:=20

How much = power were=20 you generating?

73=E2=80=99s,=20 Minto pa3bca
 
 

It changes all the = time. Not=20 even sure since i just have an E field probe to decouple some power = from my TX=20 antenna and feed it to a 50 uA amperemeter, shunted by a = potentiometer. This=20 poti was adjusted to show 100% full scale when using 120 W RF before = some=20 weeks. Now reduced the parallel R on the poti so it shows just 25 uA = then. Got=20 50 uA anyway by QRO and more (not sure). So it should be arround 500W. = This is=20 -6 dBfs :-)

But the antenna, i.e. the coil and its cover is = very lossy=20 it seems. When there was rain, i have up to twice the losses :-( Need = to=20 search for an alternative cover (mustn't burn, so a water barrel is no = alternative...).


73,=20 Stefan/DK7FC
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