Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8CECE380005A6; Thu, 31 May 2012 14:02:24 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Sa9gg-0003Vb-O4 for rs_out_1@blacksheep.org; Thu, 31 May 2012 19:01:30 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Sa9gg-0003VR-5S for rsgb_lf_group@blacksheep.org; Thu, 31 May 2012 19:01:30 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Sa9gd-0004K5-JP for rsgb_lf_group@blacksheep.org; Thu, 31 May 2012 19:01:29 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvQKAMOwx09cHnhq/2dsb2JhbABEgkWbZ5NOdwOBH4EIghMFAQEDAggBAQNJAiwBAQMFAgEDEQQBAQolFAEEGgYWCAYTCgECAgEBh2wDDwe4boowYRtohEMDjTuXUIJg X-IronPort-AV: E=Sophos;i="4.75,694,1330905600"; d="scan'208,217";a="382844812" Received: from host-92-30-120-106.as13285.net (HELO xphd97xgq27nyf) ([92.30.120.106]) by out1.ip05ir2.opaltelecom.net with SMTP; 31 May 2012 19:01:25 +0100 Message-ID: <000f01cd3f57$649df2f0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <8BE4322932454ABBAF36917E7F0B7293@uwePC> <4FC74C16.1050905@iup.uni-heidelberg.de> <034701cd3f1d$b69fa650$1502a8c0@Clemens04> <4FC7596E.4070806@iup.uni-heidelberg.de> <63351021B87046C482A1433665C54902@uwePC> <000d01cd3f47$8f89e7e0$0401a8c0@xphd97xgq27nyf> Date: Thu, 31 May 2012 18:01:23 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: PS G4JNT built a 700w LF rig out of junk and has published the info to this group. Difficult to justify the high cost of Kits that have to be built and produce only 60W. g3kev ----- Original Message ----- From: mal hamilton To: rsgb_lf_group@blacksheep.org Sent: Thursday, May 31, 2012 4:08 PM Subject: LF: Re: Re: 475 kc Exiter /JUMA [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.24.128.241 listed in list.dnswl.org] 0.0 FSL_XM_419 Old OE version in X-Mailer only seen in 419 spam -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 FSL_UA FSL_UA X-Scan-Signature: 46fde0e85bb17687e691200506d0382f Subject: LF: Re: Re: Re: 475 kc Exiter /JUMA Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01CD3F57.6426C720" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, NO_COST 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: 1:2:497103168:93952408 X-AOL-SCOLL-URL_COUNT: 1 x-aol-sid: 3039ac1d604d4fc7b22f37c7 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_000C_01CD3F57.6426C720 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable PS=20 G4JNT built a 700w LF rig out of junk and has published the info to this = group. Difficult to justify the high cost of Kits that have to be built = and produce only 60W.=20 g3kev ----- Original Message -----=20 From: mal hamilton=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, May 31, 2012 4:08 PM Subject: LF: Re: Re: 475 kc Exiter /JUMA Uwe I could build the same specification 60w rig for NO cost out of my = junk box hi. The rig seems expensive for a kit and only 60 watts The Ropex 130 w rig for 136 Khz was less than =A3200 new and already = built, even that was expensive. I built a 1Kw rig for almost nothing out = of my junk box and still have after many years. I also have a couple of MF marine transmitters suitable for 500 lying = in my garage !! de mal/g3kev ----- Original Message -----=20 From: Uwe Wensauer=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, May 31, 2012 3:10 PM Subject: LF: Re: 475 kc Exiter /JUMA Hi, here is the bill for my new JUMA TX500 Subtotal: 299.00=80 Postage & Packaging: 26.00=80 Tax: 68.77=80 Grand Total: 393.77=80 I=B4s by the way the 3rd kit I am building ( all bevore where built = for others ..) but thats for my self .. Uwe DK1KQ From: Stefan Sch=E4fer=20 Sent: Thursday, May 31, 2012 1:43 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: 475 kc Exiter /JUMA Hi Clemens,=20 Oh, OK. But anyway it was a very good hint to mention the JUMA 500 = TX since it leads me to the CMCD design and this paper which nicely = describes the problem of the VMCD desgin which i am trying in my first = tests. The output C of the FETs is the problem. Since i want to have a = relatively high power (100W) at 12V DC, the primary impedance is very = low. So i have to use FETs with a very low on-resistance, ideally as low = as possible of course. To find them is no problem (e.g. IRFP4368), but = the output C is much to high then. I tried a IRZF48N (2 of them of = course) as a compromise between RDSon and Cout but am just getting 60% = efficiency at 70W in the first attempt. That's not acceptable for a /p = PA that has to stay compact, i.e. without a big heat sink and/or a = fan... The basics are well explained in this paper, makes fun to read :-) 73, Stefan/DK7FC Am 31.05.2012 13:08, schrieb Clemens Paul:=20 It costs 300 Euro which is not to much.=20 Unfortunately you have to add 23%VAT tax within EU and shipping = costs=20 which I estimate to 30-40 Euro.=20 So we end up somewhere around 400 Euro.=20 Interesting kit,though.=20 73=20 Clemens=20 DL4RAJ=20 ------=_NextPart_000_000C_01CD3F57.6426C720 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
PS
G4JNT built a 700w LF rig out of junk and has = published=20 the info to this group. Difficult to justify the high cost of Kits that = have to=20 be built and produce only 60W.
g3kev
 
----- Original Message -----
From:=20 mal=20 hamilton
Sent: Thursday, May 31, 2012 = 4:08=20 PM
Subject: LF: Re: Re: 475 kc = Exiter=20 /JUMA

Uwe
I could build the same specification 60w rig = for NO cost=20 out of my junk box hi. The rig seems expensive for a kit and only 60=20 watts
The Ropex 130 w rig for 136 Khz was less = than =A3200=20 new and already built, even that was expensive. I built a 1Kw rig for = almost=20 nothing out of my junk box and still have after many = years.
I also have a couple of MF marine = transmitters=20 suitable for 500 lying in my garage !!
de mal/g3kev
 
----- Original Message -----
From:=20 Uwe=20 Wensauer
To: rsgb_lf_group@blacksheep.org= =20
Sent: Thursday, May 31, 2012 = 3:10=20 PM
Subject: LF: Re: 475 kc = Exiter=20 /JUMA

Hi,
here is the  bill for my new JUMA TX500
 
Subtotal: 299.00=80
Postage = &=20 Packaging: 26.00=80
Tax: 68.77=80
Grand Total: = 393.77=80
 
I=B4s by the way the 3rd kit I = am building (=20 all bevore where built for others ..) but thats for my self = ..
 
Uwe DK1KQ

 
From: Stefan = Sch=E4fer=20
Sent: Thursday, May 31, 2012 1:43 PM
Subject: Re: LF: 475 kc Exiter /JUMA
 
Hi=20 Clemens,

Oh, OK. But anyway it was a very good hint to = mention the=20 JUMA 500 TX since it leads me to the CMCD design and this paper = which nicely=20 describes the problem of the VMCD desgin which i am trying in my = first=20 tests.
The output C of the FETs is the problem. Since i want to = have a=20 relatively high power (100W) at 12V DC, the primary impedance is = very low.=20 So i have to use FETs with a very low on-resistance, ideally as low = as=20 possible of course. To find them is no problem (e.g. IRFP4368),=20 but the output C is much to high then. I tried a IRZF48N (2 of them = of=20 course) as a compromise between RDSon and Cout but am just getting = 60%=20 efficiency at 70W in the first attempt. That's not acceptable for a = /p PA=20 that has to stay compact, i.e. without a big heat sink and/or a=20 fan...

The basics are well explained in this paper, makes fun = to read=20 :-)

73, Stefan/DK7FC

Am 31.05.2012 13:08, schrieb = Clemens=20 Paul:=20
It costs 300 Euro which is not to much.=20

Unfortunately you have to add 23%VAT tax = within EU=20 and shipping costs
which I estimate to 30-40 Euro.
So we = end up=20 somewhere around 400 Euro.
Interesting kit,though.

73=20
Clemens
DL4RAJ=20


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