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 w33CcTA3025396 for ; Tue, 3 Apr 2018 14:38:30 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f3L6X-0004KV-P7 for rs_out_1@blacksheep.org; Tue, 03 Apr 2018 13:32:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f3L6U-0004KM-3Q for rsgb_lf_group@blacksheep.org; Tue, 03 Apr 2018 13:31:58 +0100 Received: from mout.perfora.net ([74.208.4.194]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1f3L6Q-0001Iu-LM for rsgb_lf_group@blacksheep.org; Tue, 03 Apr 2018 13:31:56 +0100 Received: from [192.168.1.127] ([72.224.254.201]) by mrelay.perfora.net (mreueus001 [74.208.5.2]) with ESMTPA (Nemesis) id 0M3TZW-1eCbu21qfA-00qzNw; Tue, 03 Apr 2018 14:30:30 +0200 To: rsgb_lf_group@yahoogroups.co.uk, "rsgb_lf_group@blacksheep.org" , "Discussion of the Lowfer (US, European, & UK) and MedFer bands" References: <1522674618737.74114@kuleuven.be> From: N1BUG Openpgp: preference=signencrypt Autocrypt: addr=paul@n1bug.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1522674618737.74114@kuleuven.be> Content-Language: en-US X-Provags-ID: V03:K0:ontC/kaceHIf6UfEwJJlXnkNgGr5YMu3L6E1XU7ELdZ3szNOZLe +F8SM2uk3cEYRzcBij+BjyovRTvkxioAR2O2ECmVS1vsF4X4XFTZ/xSQ0mQtKsUCKmhnO6g uHoVdkwBOtuogvPN7mvHS5CiZYnDH5g+F4fVBdD/NABTA/tRBvMtrNjVJ6uPO6LUAbW6jMA qriujJ6YoKADdS3mVBv5A== X-UI-Out-Filterresults: notjunk:1;V01:K0:/eoeVrhcpTg=:XjXr6pYv7rQ2vRRCIXkFdd 7qsa2a4k6gX+3Kpxz+HohXWH2AuFUTgPGhvKPCDfr5fAab9b54Xoy/CwCqe2yc2xU0XmhGKZ4 ovLcz4fBXMdJnZS0MzyQnwVW3iUhiV3lwrA8mxgF/2+G8OTlYVsqalHxpAikBbuxqLiBpRfPk 7aJaiMgh0J/HHldm8bj/xZeBaqSBd95xQk2C+t3Utn2pcCFqWWQQ7T1361tAeyGzZEpvyL5TQ xl6PGzYRYbUvR7a/UIJ7Qu8kLS4IOJLnN0P3nDoYcLINBlqhtH/YE5YXlj6gw/9dEaB3Vvtdy CzBERcNW/SQ7XPTJaYR5QWpejmbGiMVoNzfuGQJNDOLn+5GQpiv+GqxJe/U7nflA82MUjip+g /OUHCm2jFXNauBrRBAFAGmuBxjVANHZnsP7xQcxKApdK0xJctwy/dfwVCJUdNQ13c3vVqDMKB yiVRMFn5637qLN+tXhFlm4BzTP425a68nQ1V1Oytu/Lh42szAJT+qYaB8yz+fnFqnB/tVg67a WQCdzctfSQ6fmBmX67kCDKcvMbu/XwvGhZqQZPgMmRzDk8FktX3HcXerbeJkit62s8nQF5sfG x7lyhz72Iynq0n3zocrGS5hVM7dZwWw0erA5Zv3d1BWJAHdkrycKEwuzy+viNNn2hLF5oNvT3 5JrfNGh78Fr7ALtQN8ND07FRaecKMm5ptgdEDPmCsc8EtpyqmhBNJkpivyL2ucFc8l3K3b3qz LxpaYtyIRpdevg8kfkXpQkXxMkMX9cxtijP6lCLywC0Q0YVEfyOWvd34HH0= X-Spam-Score: 0.7 (/) 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: Hello Rik, Thanks for this information. I had only the knowledge that 50V=1000W, 30V=350W. From this I tried to "invent" some math and thought that 13V=65W seems about right. :-) But I wasn't sure. 73, Paul N1BUG [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: n1bug.com] 0.6 URIBL_SBL Contains an URL's NS IP listed in the Spamhaus SBL blocklist [URIs: n1bug.com] X-Scan-Signature: 9ca91679b330d65f05d707c2d2b164fe Subject: LF: Re: [rsgb_lf_group] EB8ARZ/2 heard last night, W1VD amp Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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=none 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 Hello Rik, Thanks for this information. I had only the knowledge that 50V=1000W, 30V=350W. From this I tried to "invent" some math and thought that 13V=65W seems about right. :-) But I wasn't sure. 73, Paul N1BUG On 04/02/2018 09:10 AM, Rik Strobbe rik.strobbe@kuleuven.be [rsgb_lf_group] wrote: >   > > ​Hello Paul, > > > +90% is good for a class D amp. > > I had similar values for my G3YXM clone at 137 kHz. > > At 475 kHz my class D push-pull PA has a skightly less (abt. 85%) > efficiency, but with 2xIRF450 I do not worry about 45 W heat > dissipation at 250 W output. > > 65W at 13Vdc indicates that 50Vdc should give the 1kW you are aiming > for. > > > 73, Rik  ON7YD - OR7T > > > -------------------------------------------------------------------- > *Van:* rsgb_lf_group@yahoogroups.co.uk > namens N1BUG paul@n1bug.com > [rsgb_lf_group] > *Verzonden:* maandag 2 april 2018 13:40 > *Aan:* rsgb_lf_group@blacksheep.org; > rsgb_lf_group@yahoogroups.co.uk; Discussion of the Lowfer (US, > European, & UK) and MedFer bands > *Onderwerp:* [rsgb_lf_group] EB8ARZ/2 heard last night, W1VD amp >   >   > > There is still life in the band! I returned to WSPR-2 for a bit last > night. I was heard by DL/SWL. I am pleased to report I heard > EB8ARZ/2 for the first time. I hope he is checking WSPRnet to be > aware of this. Has anyone else in North America heard him? > > I have finally finished building my W1VD kilowatt deck. During the > first tests is produced about 65 watts at 13 volts with efficiency > in the low to mid 90 per cent range. I don't know if that is what I > should expect at this voltage but efficiency and waveforms look > good. I found some server power supplies which I will try to modify > to power the amp. If that works I may get to the full 1 watt EIRP soon. > > http://www.n1bug.com/w1vd-first-test.jpg > > 73, > Paul N1BUG