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 vBOHeQOp018959 for ; Sun, 24 Dec 2017 18:40:27 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eTA9c-0003m5-4e for rs_out_1@blacksheep.org; Sun, 24 Dec 2017 17:33:40 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eTA9b-0003lu-Qu for rsgb_lf_group@blacksheep.org; Sun, 24 Dec 2017 17:33:39 +0000 Received: from mail-qt0-x22a.google.com ([2607:f8b0:400d:c0d::22a]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eTA9Y-0005bg-5z for rsgb_lf_group@blacksheep.org; Sun, 24 Dec 2017 17:33:38 +0000 Received: by mail-qt0-x22a.google.com with SMTP id g10so41329491qtj.12 for ; Sun, 24 Dec 2017 09:33:35 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=1+w+ruF71HYB6tYkP1D/+bPwFJcVvDzTZQmydhaaoUs=; b=GM3r8BwBOOOijoFkVuo/ie8HEZLfRr+nsrcpIDsw54eS0IS9IbTRgWZRyqCnibRV1W dVi/qPnjEcZMjGf8eAkkpFm4g/FLacQgZSyCk/xqoXJN56LpJneh04lAD6GzGV6wSPu2 5z5JvbIkDvmZcuLi+qoVVkuEaualuZKsSriXOQx8/B2/XtEMYyK9i+wqw6J36Co8SHQ/ c7LBS5XdZwR96LNVaomjvATW04hyxB6uFCHEDEaTqyif/BZwLefxSEtl49ipq0mRT/8c +Ba63vZFsC5F9TsCvO6gzmf4vvIKqilzpUFi/WcAB7PbHc/8hpGBzcfKIq+CG9Jfv3B1 ymYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=1+w+ruF71HYB6tYkP1D/+bPwFJcVvDzTZQmydhaaoUs=; b=aU2qNQrRhcSvabB2G75YJBwigTyw+qKXUPD+DLQyYb30M+Z/06cTewBaQRxho8fKBy ps1+UxwzkLQ7kCmkbp+qi4Pj6SIXfioTZqfF5v09S3IU0DK2a1xE76i0W48v8pVmQVs0 HgjN7E9SJNem011Zptttcrxp0vR7RuCJab2Z7vnY8x/Lv5rvULsMrfOSttHhKbJEt54e u0bByG65ul7/jQyg0cQW0h909Cg2DezS/HvXOu2Vt3gJXCyCQj5JD5VvVOWrpj+OTTN5 MyVz17kihMJxF9zqVqe/IcX9Mgajbiz0dvrJViCvOtppq3a6HRplWUWTQgR8QmLHEvpT bEcQ== X-Gm-Message-State: AKGB3mKoC23rxgIiaqHCIPfRFZPvmUjOyesfEjrQvFWxLX8NUaUxad+X UfNsayuV6SC6zvQbAvKpWISD9rw02b3R/45jE8o= X-Google-Smtp-Source: ACJfBouNguwVcPqNAeMOD0glw0kAVb9Xgy1hshUH/GS8WkoKVuJsWnxk7q2owrNAzZn3mK8xBDggAuJdfZk/7Oe8bns= X-Received: by 10.200.15.76 with SMTP id l12mr27709723qtk.225.1514136814369; Sun, 24 Dec 2017 09:33:34 -0800 (PST) MIME-Version: 1.0 Received: by 10.140.25.140 with HTTP; Sun, 24 Dec 2017 09:33:33 -0800 (PST) Received: by 10.140.25.140 with HTTP; Sun, 24 Dec 2017 09:33:33 -0800 (PST) In-Reply-To: <5A3F9D04.90800@posteo.de> References: <4ffc7958-810a-e4d2-7745-258a58338934@n1bug.com> <5A3AE81B.9010205@posteo.de> <5A3B8FB1.1020403@posteo.de> <7ee833a8-04b4-4712-d927-7eccf37eec14@n1bug.com> <5A3D9BC1.1040609@posteo.de> <6fa587ef-d5b0-6a67-b604-ba94144444f7@n1bug.com> <5A3E77DD.4090908@posteo.de> <103A2C60B87B4930A99ED33442E477AF@StevePC> <792271d9-34bb-3fb1-140c-c322015e2e9b@n1bug.com> <5A3F9D04.90800@posteo.de> From: Riccardo Zoli Date: Sun, 24 Dec 2017 18:33:33 +0100 Message-ID: To: LF Group X-Spam-Score: 0.3 (/) 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 the administrator of that system for details. Content preview: Hi Paul, Stefan my first PA for MF and LF, based on a IRF520, was similar. However, I used a most appropriate 1:4 output transformer instead a 1:9. With 13.8V, a 50mA bias current is more than adequate for AB class. You could obtain about 20-22W max on output. Obiviously, more supply voltage it means more power output. [...] Content analysis details: (0.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (riccardozoli80[at]gmail.com) 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (riccardozoli80[at]gmail.com) 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: 0b36c952c26be93e626fe2fa1c93657f Subject: Re: LF: TXing 2200m WSPR Content-Type: multipart/alternative; boundary="94eb2c089f7af63e490561197269" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.7 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_30_40, 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 --94eb2c089f7af63e490561197269 Content-Type: text/plain; charset="UTF-8" Hi Paul, Stefan my first PA for MF and LF, based on a IRF520, was similar. However, I used a most appropriate 1:4 output transformer instead a 1:9. With 13.8V, a 50mA bias current is more than adequate for AB class. You could obtain about 20-22W max on output. Obiviously, more supply voltage it means more power output. Merry XMAS & HNY! All the best 73 de Riccardo IW4DXW Il 24/Dic/2017 13:30, "DK7FC" ha scritto: > Hi Paul, > > Am 23.12.2017 23:36, schrieb N1BUG: > >> For anyone trying to follow along, this is my current version: >> >> http://n1bug.com/ASB_LF_Amp-20171223.jpg >> > > The circuit looks good to me now. Maybe it helps to use a low pass filter > in T configuration instead of a PI config. The T config starts with a > series L. The PI config starts with a parallel C. That could make a > significant difference for the harmonics. > > 73 and Merry christmas, Stefan > > --94eb2c089f7af63e490561197269 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Paul, St= efan=C2=A0

my first PA f= or MF and LF, based on a IRF520, was similar.
Howeve= r, I used a most appropriate 1:4 output transformer instead a 1:9. With 13.= 8V, a 50mA bias current is more than adequate for AB class. You could obtai= n about 20-22W max on output.
Obiviously, more suppl= y voltage it means more power output.

Merry XMAS & HNY!

All the best


73 de Riccardo IW4DXW
<= br>

Il= 24/Dic/2017 13:30, "DK7FC" <selberdenken@posteo.de> ha scritto:
Hi Paul,

Am 23.12.2017 23:36, schrieb N1BUG:
For anyone trying to follow along, this is my current version:

http://n1bug.com/ASB_LF_Amp-20171223.jpg

The circuit looks good to me now. Maybe it helps to use a low pass filter i= n T configuration instead of a PI config. The T config starts with a series= L. The PI config starts with a parallel C. That could make a significant d= ifference for the harmonics.

73 and Merry christmas, Stefan

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