Return-Path: X-Spam-DCC: paranoid 1002; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_FONT_FACE_BAD,HTML_MESSAGE,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t9HIsQuc021854 for ; Sat, 17 Oct 2015 20:54:27 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZnWZ8-0003Fd-Fn for rs_out_1@blacksheep.org; Sat, 17 Oct 2015 19:50:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZnWZ8-0003FT-4g for rsgb_lf_group@blacksheep.org; Sat, 17 Oct 2015 19:50:50 +0100 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZnWY3-0001yb-T6 for rsgb_lf_group@blacksheep.org; Sat, 17 Oct 2015 19:50:48 +0100 X-IronPort-AV: E=Sophos;i="5.17,693,1437433200"; d="scan'208,217";a="136850378" Received: from unknown (HELO [127.0.0.1]) ([109.176.196.66]) by smtpout.karoo.kcom.com with ESMTP; 17 Oct 2015 19:49:28 +0100 Message-ID: <56229837.504@lineone.net> Date: Sat, 17 Oct 2015 19:49:27 +0100 From: LineOne User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <08B5A81DD2D14C84874DD10EEB145569@lindavideo> <562270DF.6060606@posteo.de> <4984ACE6DAD948639B45FCDA15692B5B@lindavideo> In-Reply-To: <4984ACE6DAD948639B45FCDA15692B5B@lindavideo> X-Scan-Signature: 4ad75ad27eb9a353f40105f6e3872b5c Subject: Re: LF: TX Toroid Material Content-Type: multipart/alternative; boundary="------------050407030401050504000503" 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4445 This is a multi-part message in MIME format. --------------050407030401050504000503 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit I would recommend type 77, I use an FT240-77 up to 400W and it's scarcely warm. The price is good compared to the Ferroxcube alternatives. Hugh, M0DSZ On 17/10/2015 17:11, Ken wrote: > > Hi Stfan. > > I have been looking at the 77 type material, but waiting for other > group members opinion. > > 73 > > Ken > > ------------------------------------------------------------------------ > > *From:*owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] *On Behalf Of *DK7FC > *Sent:* 17 October 2015 17:02 > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: TX Toroid Material > > PS: For the RF transformers i often use N30 ferrite material with good > results. An AL of 4000 nH or above is a good choice. If you want to > use Amidon ferrite cores, use type 77 material (available on most > distributors). > 73 > > Am 17.10.2015 17:41, schrieb Ken: > > Dear All. I am having problems with the choice of material for the > output network of the 475kHz Valve TX. The network is an L – C – L, > ‘T’ network with an input impedance of 2100 ohms and a load of 50 > ohms, for this configuration the input L is 7.7mH, shunt capacitance > is 117pf, and output L is 1.1mH. The PA design using a 6146 low power > or 813 high power work fine when simulated using LT spice IV. When > testing in the real world using the 6146 there is in excess of 800v > rms rf on the network side of the anode coupling capacitor, but > nothing after the input L. I can only conclude that I using the wrong > type material for the toroids, I used the largest size (unmarked) > toroid which gave me a modest number of turns. I have checked the > Amidon tables and Iron Powder because of the low A_L values, which > leaves Ferrite, which mix would you recommend? The simulations give me > output powers 90W for the 6146, and 300W for the 813. I would be > grateful for any core material advice . > > Ken Wright. > > M0KHW > --------------050407030401050504000503 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit I would recommend type 77, I use an FT240-77 up to 400W and it's scarcely warm. The price is good compared to the Ferroxcube alternatives.

Hugh, M0DSZ

On 17/10/2015 17:11, Ken wrote:

Hi Stfan.

I have been looking at the 77 type material, but waiting for other group members opinion.

 

73

 

Ken

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
Sent: 17 October 2015 17:02
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: TX Toroid Material

 

PS: For the RF transformers i often use N30 ferrite material with good results. An AL of 4000 nH or above is a good choice. If you want to use Amidon ferrite cores, use type 77 material (available on most distributors).
73

Am 17.10.2015 17:41, schrieb Ken:

Dear All. I am having problems with the choice of material for the output network of the 475kHz Valve TX. The network is an L – C – L, ‘T’ network with an input impedance of 2100 ohms and a load of 50 ohms, for this configuration the input L is 7.7mH, shunt capacitance is 117pf, and output L is 1.1mH. The PA design using a 6146 low power or 813 high power work fine when simulated using LT spice IV. When testing in the real world using the 6146 there is in excess of 800v rms rf on the network side of the anode coupling capacitor, but nothing after the input L. I can only conclude that I using the wrong type material for the toroids, I used the largest size (unmarked) toroid which gave me a modest number of turns. I have checked the Amidon tables and Iron Powder because of the low AL values, which leaves Ferrite, which mix would you recommend? The simulations give me output powers 90W for the 6146, and 300W for the 813. I would be grateful for any core material advice .

 

Ken Wright.

M0KHW

 


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