Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9A0833800009D; Thu, 31 May 2012 13:59:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Sa9d1-0003Pd-I4 for rs_out_1@blacksheep.org; Thu, 31 May 2012 18:57:43 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Sa9d0-0003PU-Rt for rsgb_lf_group@blacksheep.org; Thu, 31 May 2012 18:57:42 +0100 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Sa9cy-0004Hu-6z for rsgb_lf_group@blacksheep.org; Thu, 31 May 2012 18:57:41 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArILAN6vx09cHnhq/2dsb2JhbABEgkWbZ5NOAXYDgR+BCIITBQEBAwIIAQEDPA0CLAEBAwUCAQMRBAEBCiUUAQQaBhYIBhMKAQICAQGHbAMPB7hwijBhGgFohEMDjTuXUIJggV8 X-IronPort-AV: E=Sophos;i="4.75,694,1330905600"; d="scan'208,217";a="393021290" Received: from host-92-30-120-106.as13285.net (HELO xphd97xgq27nyf) ([92.30.120.106]) by out1.ip01ir2.opaltelecom.net with SMTP; 31 May 2012 18:57:37 +0100 Message-ID: <003d01cd3f56$dcfabe50$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <8BE4322932454ABBAF36917E7F0B7293@uwePC> <4FC74C16.1050905@iup.uni-heidelberg.de> <034701cd3f1d$b69fa650$1502a8c0@Clemens04> <4FC7596E.4070806@iup.uni-heidelberg.de> <63351021B87046C482A1433665C54902@uwePC> <000d01cd3f47$8f89e7e0$0401a8c0@xphd97xgq27nyf> <00d801cd3f50$21f1a2f0$1502a8c0@Clemens04> Date: Thu, 31 May 2012 17:57:36 -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: I think it very helpful for him to save money since he is building from a KIT he may as well be building from the junk box at no cost, a good radio amateur approach. G4JNT has built a 700 watt rig from the junk box and described many times also uploaded to this group. I have built several rigs from the junk box and use LOPT transformers from junk TV sets at no cost. All radio amateurs in discussion while having a QSO describe what they are building and using. Others should be encouraged to be positive and built where possible and CW is a big advantage under marginal propagation conditions. I wonder why you have a problem with my experiences and achievements?? in fact one of your own German amateurs DK7FC builds his own equipment and has great success with world wide communications on LF. He publishes information frequently about his experiments and achievements. Do you have the same problem with his emails. Are you trying to suppress LF/MF experimenters describing their experiences and success?? de G3KEV [...] 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 [62.24.128.237 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: a5eebf1400afcbaf7aee821a75970899 Subject: LF: Re: Re: Re: Re: 475 kc Exiter /JUMA Content-Type: multipart/alternative; boundary="----=_NextPart_000_003A_01CD3F56.DCB7E8F0" 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: 1:2:501059424:93952408 X-AOL-SCOLL-URL_COUNT: 1 x-aol-sid: 3039ac1d600e4fc7b16e082e 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_003A_01CD3F56.DCB7E8F0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I think it very helpful for him to save money since he is building from = a KIT he may as well be building from the junk box at no cost, a good = radio amateur approach. G4JNT has built a 700 watt rig from the junk box = and described many times also uploaded to this group. I have built several rigs from the junk box and use LOPT transformers = from junk TV sets at no cost.=20 All radio amateurs in discussion while having a QSO describe what they = are building and using. Others should be encouraged to be positive and built where possible and = CW is a big advantage under marginal propagation conditions. I wonder why you have a problem with my experiences and achievements?? = in fact one of your own German amateurs DK7FC builds his own equipment = and has great success with world wide communications on LF. He publishes = information frequently about his experiments and achievements. Do you = have the same problem with his emails.=20 Are you trying to suppress LF/MF experimenters describing their = experiences and success?? de G3KEV ----- Original Message -----=20 From: Clemens Paul=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, May 31, 2012 5:09 PM Subject: LF: Re: Re: Re: 475 kc Exiter /JUMA Mal, in which sense do you think is your mail helpful for Uwe or other list = members? Instead of ad nauseum repeated emails from you bragging with your home = brewing and CW skills,your antennas,etc.we would like to see mails from you = containing some possibly useful information for the list members 73 Clemens DL4RAJ ----- Original Message -----=20 From: mal hamilton=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, May 31, 2012 6:08 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 E-Mail ist virenfrei. Von AVG =FCberpr=FCft - www.avg.de Version: 2012.0.2178 / Virendatenbank: 2425/5036 - Ausgabedatum: = 31.05.2012=20 ------=_NextPart_000_003A_01CD3F56.DCB7E8F0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I think it very helpful for him to save money = since he=20 is building from a KIT he may as well be building from the = junk box at=20 no cost,  a good radio amateur approach. G4JNT has built a 700 watt = rig=20 from the junk box and described many times also uploaded to this=20 group.
I have built several rigs from the junk box and = use LOPT=20 transformers from junk TV sets at no cost.
All radio amateurs in discussion while having a = QSO=20 describe what they are building and using.
Others should be encouraged to be positive and = built where=20 possible and CW is a big advantage under marginal propagation=20 conditions.
I wonder why you have a problem with my = experiences and=20 achievements?? in fact one of your own German amateurs DK7FC builds his = own=20 equipment and has great success with world wide communications on LF. He = publishes information frequently about his experiments and achievements. = Do you=20 have the same problem with his emails.
Are you trying to suppress LF/MF experimenters = describing=20 their experiences and success??
de G3KEV
 
 
 
----- Original Message -----
From:=20 Clemens = Paul
Sent: Thursday, May 31, 2012 = 5:09=20 PM
Subject: LF: Re: Re: Re: 475 kc = Exiter=20 /JUMA

Mal,
 
in which sense do you think is your=20 mail helpful for Uwe or other list members?
Instead of ad nauseum = repeated emails=20 from you bragging with your home brewing
and CW skills,your=20 antennas,etc.we would like to see mails from = you containing
some possibly useful information for = the list=20 members
 
 
 
73
Clemens
DL4RAJ
----- Original Message -----
From:=20 mal=20 hamilton
To: rsgb_lf_group@blacksheep.org= =20
Sent: Thursday, May 31, 2012 = 6:08=20 PM
Subject: LF: Re: Re: 475 kc = Exiter=20 /JUMA

Uwe
I could build the same specification 60w rig = for NO=20 cost 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=20 than =A3200 new and already built, even that was expensive. I = built a 1Kw=20 rig for almost nothing out of my junk box and still have after = many=20 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=20 ..
 
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=20 nicely describes the problem of the VMCD desgin which i am trying = in my=20 first tests.
The output C of the FETs is the problem. Since i = want to=20 have a relatively high power (100W) at 12V DC, the primary = impedance is=20 very low. So i have to use FETs with a very low on-resistance, = ideally as=20 low as 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=20 read :-)

73, Stefan/DK7FC

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

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

73
Clemens
DL4RAJ=20


E-Mail ist = virenfrei.
Von AVG=20 =FCberpr=FCft - www.avg.de
Version:=20 2012.0.2178 / Virendatenbank: 2425/5036 - Ausgabedatum: 31.05.2012=20

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