Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v4FB89F1026945 for ; Mon, 15 May 2017 13:08:10 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dADin-000306-Ee for rs_out_1@blacksheep.org; Mon, 15 May 2017 11:59:25 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dADim-0002zx-Lb for rsgb_lf_group@blacksheep.org; Mon, 15 May 2017 11:59:24 +0100 Received: from mail-wm0-x235.google.com ([2a00:1450:400c:c09::235]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dADij-0004Rh-T6 for rsgb_lf_group@blacksheep.org; Mon, 15 May 2017 11:59:23 +0100 Received: by mail-wm0-x235.google.com with SMTP id u65so77282375wmu.1 for ; Mon, 15 May 2017 03:59:21 -0700 (PDT) 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=from:date:message-id:to:subject:in-reply-to:references:mime-version :content-transfer-encoding; bh=qtAPJXMYohC6cpQKXENotahIbKdDsnG+MHBH5QeXShY=; b=DIKYeq1bcOfsWGu9fuIup1sJVWnCS4B3AI8WlJ3Upj4E7rW0hLNlp8dmCAiQiitmVn vM5kYBJGtASc1eljbxtsC2RP0lrK3/ng5fsn3i/0+YK2k95jb9oQ2zaHC95/aWmDGKDq ifHpUG4IvaZunWscD8inKPNpSGTigQfmHbdwZOrnxDpyMj9ZrdBZSzf5WpjvVZAy3LpB wd+5k1J5euKz6bLhpc3B+U6WYacDVWU96tLFrDfmguWys2kgNTmbBfUlmXOPCzaak6MW itGATeO/BnNHX1C+YqmdDCq/tNPOTWLDYNLklGw7YndAbC/DqhwMQPPKatZ5dhxZfAgg jFUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:message-id:to:subject:in-reply-to :references:mime-version:content-transfer-encoding; bh=qtAPJXMYohC6cpQKXENotahIbKdDsnG+MHBH5QeXShY=; b=i4RMyNufctw9yH79Tg53dRO+KjCjMuQI2z/tEtkqApFFYxdoIT8YocSjJLjJnC5Xxd ynQU2JHqAzXBhACYT40V9XBTGQtLN/SsJ2y9Y4mNm2YwnrcB6qdXKjIqkdArZqAGUbdE zmNxKIKqqDZSHVAyuIjPOymTLbL4QzpQ+gOtOMKxArrOKfyAkaS9zZHO2eXJM67DodtO iXUZS3u9ftF/CQOyOpbkfR6X3mjdQLkiEXlsECwGgEStOSI1UBe2Gpl0T2MMDlwOG2W1 KQ+EPr3/vuG3vIRdSJ6kYnhs8iXKNPidEHCZToSFxpSgWu/aMr7osIlWN4oEkoQwQ3nN sKAg== X-Gm-Message-State: AODbwcD7hN5ccQbyUh8r2x3CmubD6ejXDR9lefZ+lEoP3RMPoEaJOiRU BP4M4VgHNrXQCdBr X-Received: by 10.223.135.216 with SMTP id c24mr3581941wrc.109.1494845957218; Mon, 15 May 2017 03:59:17 -0700 (PDT) Received: from OfficeWin7.lan (82-70-254-222.dsl.in-addr.zen.co.uk. [82.70.254.222]) by smtp.gmail.com with ESMTPSA id r29sm10068539wra.18.2017.05.15.03.59.16 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 15 May 2017 03:59:16 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Mon, 15 May 2017 11:59:15 +0100 X-Priority: 3 (Normal) Message-ID: <3410649648.20170515115915@gmail.com> To: Clemens Paul In-Reply-To: <207D3508CBD84798B5755E41E731F4C4@Clemens0811> References: <1147474554.20170513112552@gmail.com> <207D3508CBD84798B5755E41E731F4C4@Clemens0811> MIME-Version: 1.0 X-Scan-Signature: 7001055fa59a9c23b9831ea6d317a074 Subject: Re: LF: RE: Combining LF amps revisited Content-Type: text/plain; charset=iso-8859-1 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 X-Scanned-By: MIMEDefang 2.75 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by lipkowski.org id v4FB89F1026945 Status: RO X-Status: X-Keywords: X-UID: 11695 Hello Clemens, Thanks for the reply, the 3 stacked cores will rise to 70 degrees C plus even with a small computer processor fan blowing through them. I am investigating ways of reducing this, the cores are shown as 77 material in jay's schematic, but he and I are using the newer 78 material for the PA output transformer cores. I may try using this 76 material in the combiner transformer. Someone else suggested making the PA output transformers work at 100 ohms and using a transformer less zero degree hybrid coupler. I'd try Andy's twin primary, one secondary transformer instead of the coupler if i knew what winding ratio and what core to start off with. Thanks again. > Hi Chris, > I have a tool by DJ5IL here which predicts around 60°C for the cores > (excluding heat caused by the winding) > and ca. 480 Gauss flux density. > 73 > Clemens > DL4RAJ -- Best regards, Chris mailto:dead_fets@gmail.com