Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9D536380000AC; Wed, 19 Dec 2012 13:09:57 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TlNpR-0004p0-Ba for rs_out_1@blacksheep.org; Wed, 19 Dec 2012 17:53:13 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TlNpQ-0004oo-Oc for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 17:53:12 +0000 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TlNpO-0001Uk-MQ for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 17:53:11 +0000 Received: from AGB ([2.26.22.72]) by mwinf5d39 with ME id dVsp1k00Q1ZK6g203VspuD; Wed, 19 Dec 2012 18:52:50 +0100 Message-ID: <6DEA6A69388143C982FD7A3B1340B233@AGB> From: "Graham" 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> <001801cddddf$cb3758e0$0501a8c0@xphd97xgq27nyf> <1355938960.81752.YahooMailNeo@web133205.mail.ir2.yahoo.com> In-Reply-To: <1355938960.81752.YahooMailNeo@web133205.mail.ir2.yahoo.com> Date: Wed, 19 Dec 2012 17:52:49 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) 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: Probably a early form of Spread Spectrum , hard to JAM if is its jumping about the band and difficult to make a fake transmission if the Tx has a wobbly bob signature : ) G.. From: M0FMT Sent: Wednesday, December 19, 2012 5:42 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Better picture of the 807 based 500kHz TX [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: b3f8fb035a284b2b872f787d60d4607d Subject: Re: LF: Better picture of the 807 based 500kHz TX Content-Type: multipart/alternative; boundary="----=_NextPart_000_0182_01CDDE11.A91924A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.4 required=5.0 tests=HTML_50_60,HTML_FONT_BIG, HTML_MESSAGE,MISSING_OUTLOOK_NAME 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: 3039ac1d409050d202f51646 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_0182_01CDDE11.A91924A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Probably a early form of Spread Spectrum , hard to JAM if is = its jumping about the band and difficult to make a fake = transmission if the Tx has a wobbly bob signature : ) G..=20 From: M0FMT=20 Sent: Wednesday, December 19, 2012 5:42 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Better picture of the 807 based 500kHz TX OK Mal Point taken. I was referring to a "Power" oscillator like a single 6L6 = used as an Xtal oscillator running at 15 / 20Watts which means normally = there is insufficient current (really) from a VR tube for the = Anode(plate) so all that is necessary is to stab the screen. Otherwise I = totally agree. I do know the standard T1154 chirps well. There is a PA0 who runs one on = 500 and I am sure you have worked him it is like a signature signal HI.=20 I think there was some kind unpleasantness going on at the time of the = T1154 manufacture so the fine points of frequency control was probably a = low priority. 73 es GL Pete M0FMT IO91UX From: mal hamilton To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, 19 December 2012, 11:55 Subject: Re: LF: Better picture of the 807 based 500kHz TX 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_0182_01CDDE11.A91924A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Probably   a  early  form  of  Spread = Spectrum  , hard to  JAM   if is its =20 jumping   about the  band  and  difficult  = to  make a  fake  transmission if the  Tx has = a =20 wobbly  bob  signature  : )
 
G..

From: M0FMT
Sent: Wednesday, December 19, 2012 5:42 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: Better picture of the 807 based 500kHz=20 TX

OK Mal
 
Point taken. I was referring=20 to a "Power" oscillator like a single 6L6 used as an Xtal oscillator running at 15 / 20Watts which = means=20 normally there is insufficient=20 current (really) from a VR = tube for the=20 Anode(plate) so all that is necessary is to stab the screen. Otherwise I = totally=20 agree.
I do know the standard T1154 chirps well. There is a PA0 who = runs one=20 on 500 and I am sure you have worked him it is like a signature = signal=20 HI. 
I think there was some kind unpleasantness going on at the time = of the=20 T1154 manufacture so the fine points of frequency control was = probably=20 a low priority.
73 es GL Pete M0FMT = IO91UX
From: mal hamilton=20 <g3kevmal@talktalk.net>
To: = rsgb_lf_group@blacksheep.org=20
Sent: Wednesday, = 19 December=20 2012, 11:55
Subject: Re: LF:=20 Better picture of the 807 based 500kHz TX

Hi Pete
Stabilise both Plate es Screen on an = Oscillator,=20 followed by a Cathode follower to avoid chirp and osc pulling.
The T1154 was very unstable with a bad chirp, = surprised=20 it ever passed Quality Control
G3KEV
 
-----=20 Original Message -----
From:=20 M0FMT =
To:=20 rsgb_lf_group@blacksheep.= org=20
Sent:=20 Wednesday, December 19, 2012 10:08 AM Subject:=20 Fw: LF: Better picture of = the 807=20 based 500kHz TX

 Try again minus cct too=20 big I think.

73 es GL Pete M0FMT = IO91UX
----- Forwarded Message = -----
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=20 the 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=20 event so foregive the = presentation=20 on the back of an envelope.
I now get at least 4Watts after adjusting the ant link = coupling=20 away from the chasis. = Best audible=20 DX Kent 80miles best = Opera DX PA0 land.
73 es GL Pete = M0FMT IO91UX
From: Dimitrios Tsifakis = <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=20 like the glow of VR = tubes!=20 :-)

73, Dimitris VK1SV



 




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