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Date: Thu, 20 Dec 2012 14:47:21 +1100
Message-ID: <CAKvcm2cAnZK5nJwoQO7rUVUaofhgS4NzBrbnSKhZeu9TN5okuQ@mail.gmail.com>
From: Dimitrios Tsifakis <dtsifakis@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Better picture of the 807 based 500kHz TX
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When it comes to CW transmitters, this one takes the cake I think:

http://fhs-consulting.com/aa1tj/newenglandcodetalker.html

73, Dimitris

2012/12/20 Graham <g8fzk@g8fzk.fsnet.co.uk>:
> Now  there is  a  idea  , could  use  a  music  synth  to  make a wobbly
> note  , and  send it  via the  ssb exciter , for  a  real  retro vintage cw
> sound ?
>
> just had a long  retro  data  qso  with  Chris  xiz , on 502 , must be  2
> years at  least  since used  rtty  ,   beacon  still  running  now  , not
> sure  if anyone is  still  monitoring  , all  this  web linking  has
> spoiled  things !
>
> 73 -G..
>
> From: M0FMT
> Sent: Wednesday, December 19, 2012 6:53 PM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> OK Graham
>
> Good point! But it doesn't jump it chirps quite pleasently Louis PA0LCE runs
> one on 500kc/s and tells me ops like the Retro sound.
>
> 73 es GL Pete M0FMT IO91UX
>
> From: Graham <g8fzk@g8fzk.fsnet.co.uk>
> To: rsgb_lf_group@blacksheep.org
> Sent: Wednesday, 19 December 2012, 17:52
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> 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
>
> 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.
> 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 <g3kevmal@talktalk.net>
> To: rsgb_lf_group@blacksheep.org
> 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.
> The T1154 was very unstable with a bad chirp, surprised it ever passed
> Quality Control
> G3KEV
>
>
> ----- Original Message -----
> From: M0FMT
> To: rsgb_lf_group@blacksheep.org
> 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 <m0fmt@yahoo.co.uk>
> To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
> 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 <dtsifakis@gmail.com>
> To: rsgb_lf_group@blacksheep.org
> Sent: Tuesday, 18 December 2012, 23:46
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> 2012/12/19 Graham <g8fzk@g8fzk.fsnet.co.uk>:
>> Why the  stabilised  screen  supply ?
>> G..
>
> It's embarassing. I like the glow of VR tubes! :-)
>
> 73, Dimitris VK1SV
>
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