Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj05.r1000.mx.aol.com (Internet Inbound) with ESMTP id E39CD38000091; Wed, 19 Dec 2012 06:57:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TlIG3-0001ZB-RA for rs_out_1@blacksheep.org; Wed, 19 Dec 2012 11:56:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TlIG3-0001Z2-8c for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 11:56:19 +0000 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TlIG1-0008Eu-7I for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 11:56:18 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArAFAEup0VBcF/qc/2dsb2JhbABFgkmjawOXShdzghkFAQEFCAEBA0kCLAEBAwUCAQMRBAEBCiUUAQQIEgYWCAYTCgECAgEBh3ADE65nCwKJVYtiaRyEJwOILIVRhjcEjQmFEYJ0 X-IronPort-AV: E=Sophos;i="4.84,316,1355097600"; d="scan'208,217";a="413061712" Received: from host-92-23-250-156.as13285.net (HELO xphd97xgq27nyf) ([92.23.250.156]) by out1.ip02ir2.opaltelecom.net with SMTP; 19 Dec 2012 11:55:55 +0000 Message-ID: <001801cddddf$cb3758e0$0501a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <20121218092921.Horde.h2yZX_rSz0VQ0BtRPVIC2uA@posti.anvianet.fi> <20121218100332.Horde.2ASBc_rSz0VQ0CNU8mNkBhA@posti.anvianet.fi> <20121218152622.Horde.XfcUIerSz0VQ0G7_VqKUnlA@posti.anvianet.fi> <83EEBFC65ED94B0880138E0637A84E24@AGB> <1355910758.35770.YahooMailNeo@web133201.mail.ir2.yahoo.com> <1355911711.86770.YahooMailNeo@web133202.mail.ir2.yahoo.com> Date: Wed, 19 Dec 2012 11:55:51 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 2.6 (++) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Pete Stabilise both Plate es Screen on an Oscillator, followed by a Cathode follower to avoid chirp and osc pulling. The T1154 was very unstable with a bad chirp, surprised it ever passed Quality Control G3KEV [...] Content analysis details: (2.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 2.6 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: 7ee575a0a6578bbbbe5ea7af32688fd5 Subject: Re: LF: Better picture of the 807 based 500kHz TX Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01CDDDDF.CAC4E800" 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_FONT_BIG, 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-global-disposition: G x-aol-sid: 3039ac1d7b9950d1aba73a19 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0015_01CDDDDF.CAC4E800 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Pete Stabilise both Plate es Screen on an Oscillator, followed by a Cathode = follower to avoid chirp and osc pulling.=20 The T1154 was very unstable with a bad chirp, surprised it ever passed = Quality Control G3KEV ----- Original Message -----=20 From: M0FMT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, December 19, 2012 10:08 AM Subject: Fw: LF: Better picture of the 807 based 500kHz TX Try again minus cct too big I think. 73 es GL Pete M0FMT IO91UX ----- Forwarded Message ----- From: M0FMT To: "rsgb_lf_group@blacksheep.org" =20 Sent: Wednesday, 19 December 2012, 9:52 Subject: Re: LF: Better picture of the 807 based 500kHz TX Hi Dimitris and group I have not seen the schematic but it is usual to stabilise the = screen of a power oscillator to reduce chirp on key down. Now you have shown us yours I will show you mine. I usually sketch = the schamatic after the event so foregive the presentation on the back = of an envelope. I now get at least 4Watts after adjusting the ant link coupling away = from the chasis. Best audible DX Kent 80miles best Opera DX PA0 land. 73 es GL Pete M0FMT IO91UX From: Dimitrios Tsifakis To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, 18 December 2012, 23:46 Subject: Re: LF: Better picture of the 807 based 500kHz TX 2012/12/19 Graham : > Why the stabilised screen supply ? > G.. It's embarassing. I like the glow of VR tubes! :-) 73, Dimitris VK1SV =20 ------=_NextPart_000_0015_01CDDDDF.CAC4E800 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Pete
Stabilise both Plate es Screen on an Oscillator, = followed=20 by a Cathode follower to avoid chirp and osc pulling.
The T1154 was very unstable with a bad chirp, = surprised it=20 ever passed Quality Control
G3KEV
 
----- Original Message -----
From:=20 M0FMT
Sent: Wednesday, December 19, = 2012 10:08=20 AM
Subject: Fw: LF: Better picture = of the=20 807 based 500kHz TX

 Try again minus cct too big I think.

73 es GL Pete M0FMT IO91UX
----- Forwarded Message=20 -----
From: M0FMT = <m0fmt@yahoo.co.uk>
To: "rsgb_lf_group@blacksheep.org= "=20 <rsgb_lf_group@blacksheep.org= >=20
Sent: Wednesday, = 19=20 December 2012, 9:52
Subject: Re: LF: Better = picture of the=20 807 based 500kHz TX

Hi Dimitris and group
 
I have not seen the schematic but it is usual to = stabilise the=20 screen of a power oscillator to reduce chirp on key = down.
Now you have shown us yours I will show you mine. I = usually=20 sketch the schamatic after the event so foregive the presentation on = the=20 back of an envelope.
I now get at least 4Watts after adjusting the ant link = coupling=20 away from the chasis. Best audible DX Kent 80miles best Opera DX PA0 = land.
73 es GL Pete M0FMT IO91UX
From: Dimitrios Tsifakis=20 <dtsifakis@gmail.com>
To: = rsgb_lf_group@blacksheep.org=20
Sent: Tuesday, = 18=20 December 2012, 23:46
Subject: Re: LF: Better = picture of=20 the 807 based 500kHz TX

2012/12/19 Graham = <g8fzk@g8fzk.fsnet.co.uk>= ;:
>=20 Why the  stabilised  screen  supply ?
>=20 G..

It's embarassing. I like the glow of VR tubes! = :-)

73,=20 Dimitris=20 = VK1SV



 


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