Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w6DEGcMN015258 for ; Fri, 13 Jul 2018 16:16:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fdynW-0006aC-Sq for rs_out_1@blacksheep.org; Fri, 13 Jul 2018 15:11:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fdynW-0006a3-CO for rsgb_lf_group@blacksheep.org; Fri, 13 Jul 2018 15:11:50 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fdynU-0008RW-A1 for rsgb_lf_group@blacksheep.org; Fri, 13 Jul 2018 15:11:49 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id 5908720F98 for ; Fri, 13 Jul 2018 16:11:46 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1531491106; bh=9jJe0++Uw1xEAUBy48GmBhkTamF7MB+meOn/MXT6lzs=; h=Date:From:To:Subject:From; b=TPlfHKSbLNa+7AmZZxwzmg6u6+8XgcDiQ83s8jJ1pxQ2jVb6rMW3WoeWn9AoySUKZ wkjkDbfrBuvYS2lTBv1WYSIwW9RK228UkkCB0QqSgb3lQEq9I2LgOLJhDupXQAvMmX CtUzazun8jaOu7XuJ7DT89HonFMV/sgx0LXEAP2yNOXd6APlapOfTgaYJHkTpM1OVN cheOdZnHiJsK3jbY6m/vfAkUShSVEgQz0jfbcuEefJK9d5l0uny7yC7q7npfKIzKUt NPPuMcm4wrOSVlOY8895mGgZ7ll8cDX1OuV7mNije8a2hJ3xwvKnsTdFmdK7sgPbHl tB5bdkg1f98yQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 41Rvr12sjXz9rxG for ; Fri, 13 Jul 2018 16:11:42 +0200 (CEST) Message-ID: <5B48B31E.3080501@posteo.de> Date: Fri, 13 Jul 2018 16:11:42 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hello Jeff, Am 13.07.2018 15:37, schrieb F6CWN: > > Some pictures here: http://lastroradio.free.fr/Astroradio2005/Album11.htm > Nice. The first time i saw a photo of F5WK. I know him from some years back but now he is not so much active on this reflector. He detected me many times on LF and VLF. [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 14e68a9cb6dee915a96310ea9bf261c5 Subject: Re: LF: Re[2]: LF: RN3AUS 136 khz TX now! Content-Type: multipart/alternative; boundary="------------070101000301000207080509" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_50_60,HTML_MESSAGE 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 This is a multi-part message in MIME format. --------------070101000301000207080509 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello Jeff, Am 13.07.2018 15:37, schrieb F6CWN: > > Some pictures here: http://lastroradio.free.fr/Astroradio2005/Album11.htm > Nice. The first time i saw a photo of F5WK. I know him from some years back but now he is not so much active on this reflector. He detected me many times on LF and VLF. > The difficulty of the kite is especially the takeoff in order to > capture as soon as possible the good windy zone (not always easy in > the middle of June!), But after that it goes ... > I do not speak also of the difficulties to pick up the wire when it > falls with the kite in a field of corn! (You have to love the RADIO!) > I think i know exactly what you mean :-) > Now, I'm all alone to do LF (and no more young), so it goes slower ... > But you have enough time, right? > The main difficulty here (I am in Normandy, near the sea, where there > is wind!) Is to find charitable souls able to share my tastes for > "curious" things like the LF / VLF. It's long and you have to make > concessions, but over time ... It's starting to become concrete! Oh and when you are close to the sea, your ground losses will be very low too. Just stay in contact here with the list. It is not only the antenna that must be tuned to resonance. It is also your mind and the mind of some people 'on the other side', the RX side! This must be tuned to a certain resonance as well, hoping for some Q :-) > I have several fields to grow antennas beverage, K9AY, and of course > kite! But to this is added some difficulties such as energy and > housing that are about to be resolved. Camping in the middle of winter > is a bit hard for my old bones ... > > On the power stage side, I'm thinking of a power MOS-based amplifier > with IXYS IXFH94N30 at liquid-cooled IXYS (water + glycol), with the > primary cooler out and the heat up (winter is good sometimes). > Is it a linear mode design? For a switch mode design you will not need such a heavy cooling. Looks fine for 2 kW + > > The transformers are mounted on welder station ferrites (nominal > frequency ~ 100 KHz, a good choice of manufacturers, thanks!) The > "high voltage" power supply provided by two 51V 57 A server power > supplies (HP EPS120) compatible with a capricious generator! (I think > he's allergic to CW!) > Sounds solid. I've done some CW on 8.97 kHz in 2011, using a weak generator that was able to produce 350W ('key-down') at that time. In CW the regulation has gone mad and the average power dropped. The PA was running at 320V DC (230V AC rectified, H-bridge using 4x IRFP460). But a parallel pack of 10x 6000 uF/350V solved the problem. For a short moment, like a 'dit' i got up to 1.8 A antenna current into my 300m vertical wire. Good luck with the build up of your LF station and i'm looking forward to your big signal. 73, Stefan --------------070101000301000207080509 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Jeff,

Am 13.07.2018 15:37, schrieb F6CWN:

Some pictures here: http://lastroradio.free.fr/Astroradio2005/Album11.htm

Nice. The first time i saw a photo of F5WK. I know him from some years back but now he is not so much active on this reflector. He detected me many times on LF and VLF.

The difficulty of the kite is especially the takeoff in order to capture as soon as possible the good windy zone (not always easy in the middle of June!), But after that it goes ...
I do not speak also of the difficulties to pick up the wire when it falls with the kite in a field of corn! (You have to love the RADIO!)

I think i know exactly what you mean :-)

Now, I'm all alone to do LF (and no more young), so it goes slower ...

But you have enough time, right?

The main difficulty here (I am in Normandy, near the sea, where there is wind!) Is to find charitable souls able to share my tastes for "curious" things like the LF / VLF. It's long and you have to make concessions, but over time ... It's starting to become concrete!
Oh and when you are close to the sea, your ground losses will be very low too.

Just stay in contact here with the list. It is not only the antenna that must be tuned to resonance. It is also your mind and the mind of some people 'on the other side', the RX side! This must be tuned to a certain resonance as well, hoping for some Q :-)

I have several fields to grow antennas beverage, K9AY, and of course kite! But to this is added some difficulties such as energy and housing that are about to be resolved. Camping in the middle of winter is a bit hard for my old bones ...

On the power stage side, I'm thinking of a power MOS-based amplifier with IXYS IXFH94N30 at liquid-cooled IXYS (water + glycol), with the primary cooler out and the heat up (winter is good sometimes).

Is it a linear mode design? For a switch mode design you will not need such a heavy cooling. Looks fine for 2 kW +

The transformers are mounted on welder station ferrites (nominal frequency ~ 100 KHz, a good choice of manufacturers, thanks!) The "high voltage" power supply provided by two 51V 57 A server power supplies (HP EPS120) compatible with a capricious generator! (I think he's allergic to CW!)

Sounds solid.
I've done some CW on 8.97 kHz in 2011, using a weak generator that was able to produce 350W ('key-down') at that time. In CW the regulation has gone mad and the average power dropped. The PA was running at 320V DC (230V AC rectified, H-bridge using 4x IRFP460). But a parallel pack of 10x 6000 uF/350V solved the problem. For a short moment, like a 'dit' i got up to 1.8 A antenna current into my 300m vertical wire.

Good luck with the build up of your LF station and i'm looking forward to your big signal.

73, Stefan
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