Return-Path: Received: from rly-mh03.mx.aol.com (rly-mh03.mail.aol.com [172.21.166.139]) by air-mh04.mail.aol.com (v121.5) with ESMTP id MAILINMH044-bc748847b6d8e; Mon, 21 Jul 2008 08:05:26 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mh03.mx.aol.com (v121.5) with ESMTP id MAILRELAYINMH037-bc748847b6d8e; Mon, 21 Jul 2008 08:05:04 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1KKu8O-0004iF-SX for rs_out_1@blacksheep.org; Mon, 21 Jul 2008 13:04:56 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1KKu8O-0004i4-B2 for rsgb_lf_group@blacksheep.org; Mon, 21 Jul 2008 13:04:56 +0100 Received: from czd.org.uk ([217.158.195.178] helo=cygnus.czd.org.uk) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1KKu8J-00023B-Ll for rsgb_lf_group@blacksheep.org; Mon, 21 Jul 2008 13:04:56 +0100 MIME-Version: 1.0 Date: Mon, 21 Jul 2008 13:01:59 +0100 Content-class: urn:content-classes:message Message-ID: <929404BD8B3FA443A58163D1A9FC4FB75925@cygnus.czd.org.uk> X-MimeOLE: Produced By Microsoft Exchange V6.5 In-Reply-To: <002201c8eb19$ef21f930$0301a8c0@mal769a60aa920> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: 500 khz TX Thread-Index: AcjrGj2fYnBPR8LST7KRr0m3DboeBQAD0W0g References: <002201c8eb19$ef21f930$0301a8c0@mal769a60aa920> From: "Martyn Kinder" To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: 500 khz TX Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C8EB29.94473BD8" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, 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 X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n X-Mailer: Unknown (No Version) ------_=_NextPart_001_01C8EB29.94473BD8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Sounds like an appliance recycler =20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D Martyn Kinder G0CZD http://www.czd.org.uk =20 Before a mad scientist goes completely mad, there will be a time when he's only partially mad. Make sure you get invited to his parties then. ________________________________ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal hamilton Sent: Monday, July 21, 2008 11:10 AM To: rsgb Subject: LF: 500 khz TX My 500 khz TX is made out of recycled components from the junk box. =20 1940 xtal in osc =20 IC osc chip/IC divider chip/IC driver chip/FET PA class E, then on the drain side =20 1940's ceramic inductor (tinned copper wire) out of a TU5B tuning unit, 1950's tube TV line output core, rewound for impedence matching FET/50 ohms. =20 LPF using unmarked cores similar to FT200 type. =20 FET out of an old marine tx 1960's vintage.=20 =20 CCT board for chips reworked from an old pre used board. =20 Ferrite chokes in V + line from old smpu, decoupling capacitors and misc items, small heatsink and fan from junk box. =20 Psu for chips 12 regulated, ex surplus =20 Psu for FET rebuilt using ex surplus high capacity capacitors, not regulated =20 The finished package looks neat and tidy and is totally reliable, and no SMOKE =20 The secret to avoid smoke in class E is to get the FET drain matching network spot on to avoid voltage/current spikes during switching. If designed properly you will be in the ball park and just need minor adjustments ie adjusting coil tappings while making observations on a 'scope. =20 I used components that I had lying around in junk boxes and the cost was NIL. =20 This is the TX that I used on 500 khz to work VE1ZZ and RW3ADB on normal CW. =20 73 De Mal/G3KEV =20 =20 =20 =20 =20 =20 =20 =20 ------_=_NextPart_001_01C8EB29.94473BD8 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Sounds like an appliance=20 recycler
 

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D
Martyn Kinder G0CZD

http://www.czd.org.uk

Before a mad=20 scientist goes completely mad, there will be a time when he's only partially= =20 mad.  Make sure you get invited to his parties=20 then.


From: owner-rsgb_lf_group@blacksheep.org= =20 [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal=20 hamilton
Sent: Monday, July 21, 2008 11:10 AM
To:=20 rsgb
Subject: LF: 500 khz TX

My 500 khz TX is made out of recycled compo= nents=20 from the junk box.
 
1940 xtal in osc
 
IC osc chip/IC divider chip/IC driver chip/= FET PA=20 class E, then on the drain side
 
1940's ceramic inductor (tinned copper=20 wire) out of a TU5B tuning unit, 1950's tube TV line output c= ore,=20 rewound for impedence matching FET/50 ohms.
 
LPF using unmarked cores similar to=20 FT200 type.
 
FET out of an old marine tx 1960's vintage.= =20
 
CCT board for chips reworked from an old pr= e used=20 board.
 
Ferrite chokes in V +  line from=20= old=20 smpu, decoupling capacitors and misc items, small heatsink and fan from junk= =20 box.
 
Psu for chips 12 regulated, ex surplus
 
Psu for FET rebuilt using ex surplus high c= apacity=20 capacitors, not regulated
 
The finished package looks neat and tidy an= d is=20 totally reliable, and no SMOKE
 
The secret to avoid smoke in class=20 E  is to get the FET drain matching network spot on to avoid=20 voltage/current spikes during switching. If designed properly you will=20= be=20 in the ball park and just need minor adjustments ie adjusting coil=20 tappings while making observations on a 'scope.
 
I used components that I had lying around i= n junk=20 boxes and the cost was NIL.
 
This is the TX that I used on 500 khz to wo= rk VE1ZZ=20 and RW3ADB on normal CW.
 
73 De Mal/G3KEV
 
 
 
 
 
 
 
  
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