Return-Path: Received: (qmail 16248 invoked from network); 13 Jun 2001 11:00:37 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 13 Jun 2001 11:00:37 -0000 Received: (qmail 10928 invoked from network); 13 Jun 2001 11:00:21 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 13 Jun 2001 11:00:21 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15A8Iv-0006L3-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 13 Jun 2001 11:55:17 +0100 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15A8Il-0006Kx-00 for rsgb_lf_group@blacksheep.org; Wed, 13 Jun 2001 11:55:08 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id LAA28863; Wed, 13 Jun 2001 11:59:14 +0100 (BST) Received: (qmail 28322 invoked from network); 13 Jun 2001 11:47:47 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 13 Jun 2001 11:47:47 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by gauntlet.mail.dera.gov.uk; id LAA16839; Wed, 13 Jun 2001 11:39:23 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma016489; Wed, 13 Jun 01 11:38:17 GMT Received: from mailex.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with SMTP id for ; Wed, 13 Jun 2001 11:53:09 +0100 Received: (qmail 29232 invoked from network); 13 Jun 2001 10:34:44 +0100 Received: from softdnserror (HELO cchecker.dstl.gov.uk) (192.168.248.52) by mailex.dstl.gov.uk with SMTP; 13 Jun 2001 09:34:44 -0000 Received: from FRN-MAIL-R1.dstl.gov.uk (unverified) by cchecker.dstl.gov.uk (Content Technologies SMTPRS 4.1.2) with ESMTP id for ; Wed, 13 Jun 2001 10:35:10 +0100 Received: by frn-mail-r1.dstl.gov.uk with Internet Mail Service (5.5.2650.21) id ; Wed, 13 Jun 2001 11:43:39 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803D55C4D3@pdw-mail-r1.dstl.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: Tx driver chips Date: Wed, 13 Jun 2001 11:43:43 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Instead of trying to control nanosecond long crossover problems and skew in driver chip propagation times, why not employ the Decca Tx approach of a small value (damped) inductor between the top and bottom power devices to 'soak up' the high current short pulses. It certainly works in my direct from mains Tx. Andy G4JNT > -----Original Message----- > From: Rik Strobbe [mailto:rik.strobbe@fys.kuleuven.ac.be] > Sent: 2001-06-13 12:01 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: RE: 73kHz tests tonight > > > At 10:25 13/06/01 +0200, you wrote: > >Could TC4428 be keyed in G3YXM design? If so, it would > simplify the whole > >schematic. > > > >Petr, 'FIG > > Petr, > > That idea crossed my mind 2 years ago when building my TX > (variation on the > YXM design). But due to different delay times in the inverting and > non-inverting drivers (I measured abt. 25ns difference) I > didn't use the > 4428 it. > If you don't wan't to use a flip-flop to get the > counter-phase signals you > can use a couple of CMOS XOR gates, with a CD4077 running on > 15V I measured > less than 3ns difference between the inverting and non inverting gate. > > 73, Rik ON7YD > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.