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 w2FFKgTp005749 for ; Thu, 15 Mar 2018 16:20:43 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ewUa7-0006Sr-Tt for rs_out_1@blacksheep.org; Thu, 15 Mar 2018 15:14:15 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ewUa5-0006Si-ON for rsgb_lf_group@blacksheep.org; Thu, 15 Mar 2018 15:14:13 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1ewUa2-0001bD-Uy for rsgb_lf_group@blacksheep.org; Thu, 15 Mar 2018 15:14:12 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id A8E3220E0C for ; Thu, 15 Mar 2018 16:14:08 +0100 (CET) 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=1521126848; bh=e5fre+rj3ofhq7qAPnOIhxDeJg+5Cm6kFy3qE30jFrk=; h=Date:From:To:Subject:From; b=mPWCN1KJJwVT8dTcmEsge/dlD0fHwxLdm/KAlVTsLdPeOArMy3b/9YDStboRgGyax Ih0YpQGJOIW7P/4qGPvX8dBeQhl99c9gHhsTX8Y24D3G1d0+7zEFSUGONh2+FVsCV+ DitrK4TY2GToMU8bcuLELo/PUkGYH7Wg9RcrGt4H1J2K9nMWOTRlJn/lDUXIJaQWt+ RIjn41X9ua5pRuzVzI83c6B3SOxWC6bpfpGQfDmOcEC9IeqQAFRbuHzcRFdD46+mUt l6S0+UtcAPunG75WEIlEHnsTS9JnoPy9ir3jT2uN0dEQM3pxMZJ451Wgti4YE62BA1 L0pLd71tziYZA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 402BvN0FGrz9rxP for ; Thu, 15 Mar 2018 16:14:07 +0100 (CET) Message-ID: <5AAA8DBF.80604@posteo.de> Date: Thu, 15 Mar 2018 16:14:07 +0100 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: <5A95721D.2060008@posteo.de> In-Reply-To: <5A95721D.2060008@posteo.de> X-Spam-Score: 0.0 (/) 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 the administrator of that system for details. Content preview: VLF, Today, i'll start TXing on 17.4701 kHz. Start time is 16 UTC and i intend to run a plain carrier at about 1 A antenna current. I'm not happy with my linear PA. The efficiency is too bad an i often get dead FETs!! I'm now thinking about a digital solution, a hard keyed class-D PA in combination with a step down converter modulating the supply voltage of the PA. Not a new concept but i never built one of them. Does someone have a circuit recommendation to give some inspiration? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -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: f64a6c8ea7591cecbecc6db95ffdd328 Subject: Re: LF: DL to VK7 ? Content-Type: multipart/alternative; boundary="------------080207080608030408070800" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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. --------------080207080608030408070800 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit VLF, Today, i'll start TXing on 17.4701 kHz. Start time is 16 UTC and i intend to run a plain carrier at about 1 A antenna current. I'm not happy with my linear PA. The efficiency is too bad an i often get dead FETs!! I'm now thinking about a digital solution, a hard keyed class-D PA in combination with a step down converter modulating the supply voltage of the PA. Not a new concept but i never built one of them. Does someone have a circuit recommendation to give some inspiration? If all works well i'll continue directly with an EbNaut message for Jay and Garry and of course anyone else who is interested: *f = 17470.1000 Hz Start time: 15:Mar.2018 23:30:00 UTC Symbol period: 20 s Characters: 3 CRC bits: 24 Coding 16K21A Duration: 05:30:40 [hh:mm:ss] Antenna current: 1 A* 73, Stefan > > > Am 27.02.2018 09:23, schrieb Edgar: >> >> Is it possible? Reception at Moonah, Tasmania. >> >> >> >> Regards, Edgar >> Moonah,Tasmania. --------------080207080608030408070800 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit VLF,

Today, i'll start TXing on 17.4701 kHz. Start time is 16 UTC and i intend to run a plain carrier at about 1 A antenna current.

I'm not happy with my linear PA. The efficiency is too bad an i often get dead FETs!! I'm now thinking about a digital solution, a hard keyed class-D PA in combination with a step down converter modulating the supply voltage of the PA. Not a new concept but i never built one of them. Does someone have a circuit recommendation to give some inspiration?

If all works well i'll continue directly with an EbNaut message for Jay and Garry and of course anyone else who is interested:

f = 17470.1000 Hz
Start time: 15:Mar.2018  23:30:00 UTC
Symbol period: 20 s
Characters: 3
CRC bits: 24
Coding 16K21A
Duration: 05:30:40 [hh:mm:ss]
Antenna current: 1 A

73, Stefan






Am 27.02.2018 09:23, schrieb Edgar:

Is it possible?  Reception at Moonah, Tasmania.



Regards, Edgar
Moonah,Tasmania.
--------------080207080608030408070800--