X-GM-THRID: 1218450040017275105 X-Gmail-Labels: rsgb lf X-Gmail-Received: d1c5a09d0fa578c075347efcd9be5d7f6a593bb6 Delivered-To: daveyxm@gmail.com Received: by 10.78.127.1 with SMTP id z1cs283110huc; Fri, 27 Oct 2006 20:18:44 -0700 (PDT) Received: by 10.67.30.6 with SMTP id h6mr593100ugj; Fri, 27 Oct 2006 20:18:44 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 32si170355ugf.2006.10.27.20.18.44; Fri, 27 Oct 2006 20:18:44 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Gdeed-00024v-Et for rs_out_1@blacksheep.org; Sat, 28 Oct 2006 04:14:39 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Gdeed-00024m-3p for rsgb_lf_group@blacksheep.org; Sat, 28 Oct 2006 04:14:39 +0100 Received: from mx-out.forthnet.gr ([193.92.150.104] helo=mx-out-04.forthnet.gr) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Gdeec-0007S9-CG for rsgb_lf_group@blacksheep.org; Sat, 28 Oct 2006 04:14:39 +0100 Received: from mx-av-01.forthnet.gr (mx-av.forthnet.gr [193.92.150.27]) by mx-out-04.forthnet.gr (8.13.7/8.13.7) with ESMTP id k9S3E8iA000988 for ; Sat, 28 Oct 2006 06:14:08 +0300 Received: from mx-in-02.forthnet.gr (mx-in-02.forthnet.gr [193.92.150.185]) by mx-av-01.forthnet.gr (8.13.7/8.13.7) with ESMTP id k9S3E6N6024168 for ; Sat, 28 Oct 2006 06:14:06 +0300 Received: from z8q8y2.ath.forthnet.gr (ppp7-15.ath.forthnet.gr [213.16.150.15]) by mx-in-02.forthnet.gr (8.13.7/8.13.7) with ESMTP id k9S3DjMe027386 for ; Sat, 28 Oct 2006 06:13:54 +0300 Authentication-Results: mx-in-02.forthnet.gr from=kkrallis@ath.forthnet.gr; sender-id=neutral; spf=neutral Message-Id: <5.0.2.1.0.20061028061106.03956cb0@popper.forthnet.gr> X-Sender: kkrallis.ath.forthnet.gr@popper.forthnet.gr@popper.forthnet.gr X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Sat, 28 Oct 2006 06:13:31 +0300 To: rsgb_lf_group@blacksheep.org From: Costas Krallis SV1XV In-Reply-To: References: <031b01c6fa30$5fa6f7f0$7900a8c0@athlon1200> Mime-Version: 1.0 X-Spam-Score: -0.0 (/) X-Spam-Report: autolearn=disabled,AWL=-0.519,DNS_FROM_RFC_ABUSE=0.479 Subject: Re: LF: grounded grid 3-500Z Content-Type: text/plain; charset="us-ascii" 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 Status: O X-Status: X-Keywords: X-UID: 6735 At 04:58 28/10/2006 +0200, you wrote: >I'm planning to build an amplifier with two times 3-500Z for operation >on low bands. > >Can anyone explain how to measure the grid current in grounded grid >applications? >In all applications there is only a different in measure plate current to >grid current by an other dimension of the shunt resistor. >Is that right? What is the theoretic of this? Perhaps at this low frequency you can just insert a current meter between the grid pin and ground, bypassed with some capacitors ? Costas SV1XV