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 w6DK7W46016789 for ; Fri, 13 Jul 2018 22:07:33 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fe49E-0007v8-DQ for rs_out_1@blacksheep.org; Fri, 13 Jul 2018 20:54:36 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fe49C-0007uz-If for rsgb_lf_group@blacksheep.org; Fri, 13 Jul 2018 20:54:34 +0100 Received: from smtp10.smtpout.orange.fr ([80.12.242.132] helo=smtp.smtpout.orange.fr) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fe49A-0000bZ-2R for rsgb_lf_group@blacksheep.org; Fri, 13 Jul 2018 20:54:33 +0100 Received: from [192.168.1.10] ([82.126.66.56]) by mwinf5d45 with ME id AKuP1y0061CppPW03KuPYA; Fri, 13 Jul 2018 21:54:31 +0200 X-ME-Helo: [192.168.1.10] X-ME-Auth: ZjZjd25Ab3JhbmdlLmZy X-ME-Date: Fri, 13 Jul 2018 21:54:31 +0200 X-ME-IP: 82.126.66.56 References: <68ab592f-ac87-cf0d-14e2-7019e102719d@orange.fr> From: F6CWN To: rsgb_lf_group@blacksheep.org X-Forwarded-Message-Id: <68ab592f-ac87-cf0d-14e2-7019e102719d@orange.fr> Message-ID: <7b1e8e9e-a764-b929-152e-6d26cf1d5869@orange.fr> Date: Fri, 13 Jul 2018 19:54:25 +0000 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <68ab592f-ac87-cf0d-14e2-7019e102719d@orange.fr> Content-Language: fr X-Spam-Score: -0.2 (/) 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 Stefan, To have "smoked" (satelized would be the real term for some MOS) many MOSFET is overheating, or by cross conduction effect, I decided to build "solid" ... This kind of radiator was originally intended for a linear amplifier over 160m (although for 99.99% CW use). Since I had to buy a bar 1m long, so why not continue for LF amps? [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.132 listed in list.dnswl.org] -0.2 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [80.12.242.132 listed in wl.mailspike.net] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (f6cwn[at]orange.fr) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 96503730ddf2014df3e6862dbcc29a55 Subject: LF: Re[2]: LF: RN3AUS 136 khz TX now! Content-Type: multipart/alternative; boundary="------------EADFA0A709EA45C5B1ED0305" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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. --------------EADFA0A709EA45C5B1ED0305 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hello Stefan, To have "smoked" (satelized would be the real term for some MOS) many MOSFET is overheating, or by cross conduction effect, I decided to build "solid" ... This kind of radiator was originally intended for a linear amplifier over 160m (although for 99.99% CW use). Since I had to buy a bar 1m long, so why not continue for LF amps? This is one of the reasons for this fabrication. At first the diet was linear, but I quickly gave up (the CW first!). Indeed the geographical position is very important in LF, I made some tests on 160m since the edge of the beach (a simple quarter wave always with the kite) but now it is no longer possible to use this material for even one full night. The public domain is monitored and we spend our time trying to explain that we are not a terrorist (to be simple, if you understand what I mean ... Poor current situation ...) I could see about 6 to 10dB better than from the mainland, which is for us amateur a dream! You really have to love Radio now! I would like to place me in a bog or marsh but my friend does not agree, he likes his motorhome, already that his YL is not too happy when he returns to his QRA all a little dirty with mud! (LF is winter and winter there is also "humidity" ... To put it simply!) Water castles like lighthouses can not be used either ... I even try to use a bridge (in the area there are some very high with "humidity down", but also categorical refusal.We do not have an easy hobby and I do not like stamp collections ...;-) I did not know exactly the maximum power of the final stage, but I think that it will be appropriate for our amateur application, the important thing is to have a reliable machine not to risk to ruin an expedition in the nature for some MOS which return to the wild life! ;-) I am interested in all your maneuvering on frequencies lower and lower, it's beautiful! But I'm not there yet ... At the speed of things in 2000 years maybe? For the ULF with the capricious amp, the good old method is often the best, it's like the "old formulas": , it still works in 2018, no? :-P I like your "style", like Ed RU6LA, all shots are allowed as long as you have fun! Have a nice evening and see you soon! VY 73's: Jeff PS: > > Now, I'm all alone to do LF (and no more young), so it goes slower ... > But you have enough time, right? The wise man said: Life is a great master, the misfortune is that he kills his students! Bye! Le 13/07/2018 à 14:11, DK7FC a écrit : > 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 --------------EADFA0A709EA45C5B1ED0305 Content-Type: multipart/related; boundary="------------4ACBD9AE75AE552DE44F8BFA" --------------4ACBD9AE75AE552DE44F8BFA Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit









Hello Stefan,
 To have "smoked" (satelized would be the real term for some MOS) many MOSFET is overheating, or by cross conduction effect, I decided to build "solid" ...

This kind of radiator was originally intended for a linear amplifier over 160m (although for 99.99% CW use). Since I had to buy a bar 1m long, so why not continue for LF amps?

This is one of the reasons for this fabrication.
At first the diet was linear, but I quickly gave up (the CW first!).

Indeed the geographical position is very important in LF, I made some tests on 160m since the edge of the beach (a simple quarter wave always with the kite) but now it is no longer possible to use this material for even one full night.

The public domain is monitored and we spend our time trying to explain that we are not a terrorist (to be simple, if you understand what I mean ... Poor current situation ...)
I could see about 6 to 10dB better than from the mainland, which is for us amateur a dream!
You really have to love Radio now!

I would like to place me in a bog or marsh but my friend does not agree, he likes his motorhome, already that his YL is not too happy when he returns to his QRA all a little dirty with mud! (LF is winter and winter there is also "humidity" ... To put it simply!)
Water castles like lighthouses can not be used either ...
I even try to use a bridge (in the area there are some very high with "humidity down", but also categorical refusal.We do not have an easy hobby and I do not like stamp collections ...;-)

I did not know exactly the maximum power of the final stage, but I think that it will be appropriate for our amateur application, the important thing is to have a reliable machine not to risk to ruin an expedition in the nature for some MOS which return to the wild life! ;-)


 I am interested in all your maneuvering on frequencies lower and lower, it's beautiful! But I'm not there yet ... At the speed of things in 2000 years maybe?
 

For the ULF with the capricious amp, the good old method is often the best, it's like the "old formulas": , it still works in 2018, no? :-P


I like your "style", like Ed RU6LA, all shots are allowed as long as you have fun!

Have a nice evening and see you soon!

VY 73's: Jeff


PS:

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

But you have enough time, right?

The wise man said: Life is a great master, the misfortune is that he kills his students!

Bye!







Le 13/07/2018 à 14:11, DK7FC a écrit :
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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