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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: 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 >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 >>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 >>>>To: "rsgb_lf_group@blacksheep.org" [...] 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 [77.238.189.66 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 80dfd4418e586cee7526d670ae10acbc Subject: Re: LF: Better picture of the 807 based 500kHz TX Content-Type: multipart/alternative; boundary="856002529-1551262948-1355943205=:10939" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_50_60,HTML_FONT_BIG, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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-SCOLL-AUTHENTICATION: mtain-ma05.r1000.mx.aol.com ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d600d50d2110665d6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --856002529-1551262948-1355943205=:10939 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable OK Graham=0A=A0=0AGood point! But it doesn't jump it chirps quite pleasentl= y=A0Louis PA0LCE runs one on 500kc/s and tells me ops like the Retro sound.= =0A=A0=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A>______________________________= __=0A> From: Graham =0A>To: rsgb_lf_group@blackshe= ep.org =0A>Sent: Wednesday, 19 December 2012, 17:52=0A>Subject: Re: LF: Bet= ter picture of the 807 based 500kHz TX=0A> =0A>=0A> =0A>Probably=A0=A0 a= =A0 early=A0 form=A0 of=A0 Spread =0ASpectrum=A0 , hard to=A0 JAM=A0=A0 if = is its=A0 =0Ajumping=A0=A0 about the=A0 band=A0 and=A0 difficult=A0 =0Ato= =A0 make a=A0 fake=A0 transmission if the=A0 Tx has a=A0 =0Awobbly=A0 bob= =A0 signature=A0 : ) =0A>=0A>G.. =0A>=0A> =0A>From: M0FMT =0A>Sent: Wedne= sday, December 19, 2012 5:42 PM =0A>To: rsgb_lf_group@blacksheep.org =0A>S= ubject: Re: LF: Better picture of the 807 based 500kHz =0ATX =0A>=0A> =0A>O= K Mal =0A>=A0 =0A>Point taken. I was referring to a "Power" oscillator like= a single 6L6 used as an Xtal=A0oscillator running at 15 / 20Watts which me= ans =0Anormally=A0there is insufficient current (really) from a VR tube for= the =0AAnode(plate) so all that is necessary is to stab the screen. Otherw= ise I totally =0Aagree. =0A>I do know the standard T1154 chirps well. There= is a PA0 who runs one =0Aon 500 and I am sure you have worked him=A0it is = like a signature signal =0AHI.=A0 =0A>I think there was some kind unpleasan= tness going on at the time of the =0AT1154 manufacture=A0so the=A0fine poin= ts of frequency control was probably =0Aa low priority.=0A> =0A>73 es GL Pe= te M0FMT IO91UX=0A>=0A>=0A>>________________________________=0A>>From: mal = hamilton =0A>>To: rsgb_lf_group@blacksheep.org =0A>>= Sent: Wednesday, 19 December 2012, 11:55=0A>>Subject: Re: LF: Better pict= ure of the 807 based 500kHz TX=0A>>=0A>>=0A>> =0A>>Hi Pete =0A>>Stabilise b= oth Plate es Screen on an Oscillator, followed by a Cathode follower to av= oid chirp and osc pulling. =0A>>The T1154 was very unstable with a bad chi= rp, surprised it ever passed Quality Control =0A>>G3KEV =0A>>=0A>>----- O= riginal Message ----- =0A>>>From: M0FMT =0A>>>To: rsgb_lf_group@blackshee= p.org =0A>>>Sent: Wednesday, December 19, 2012 10:08 AM =0A>>>Subject: Fw:= LF: Better picture of the 807 based 500kHz TX =0A>>>=0A>>> =0A>>> =0A>>>= =A0Try again minus cct too big I think.=0A>>>=0A>>> =0A>>>73 es GL Pete M0= FMT IO91UX=0A>>>=0A>>>----- Forwarded Message -----=0A>>>>From: M0FMT =0A>>>>To: "rsgb_lf_group@blacksheep.org" =0A>>>>Sent: Wednesday, 19 December 2012, 9:52=0A>>>>Subject= : Re: LF: Better picture of the 807 based 500kHz TX=0A>>>>=0A>>>>=0A>>>>Hi= Dimitris and group =0A>>>>=A0 =0A>>>>I have not seen the schematic but it = is usual to stabilise the screen of a power oscillator to reduce chirp on = key down. =0A>>>>Now you have shown us yours I will show you mine. I usuall= y sketch the schamatic after the event so foregive the presentation on t= he back of an envelope. =0A>>>>I now get at least 4Watts after adjusting th= e ant link coupling away from the chasis. Best audible DX Kent 80miles bes= t Opera DX PA0 land.=0A>>>> =0A>>>>73 es GL Pete M0FMT IO91UX=0A>>>>=0A>>>>= =0A>>>>>________________________________=0A>>>>>From: Dimitrios Tsifakis =0A>>>>>To: rsgb_lf_group@blacksheep.org =0A>>>>>Sent: T= uesday, 18 December 2012, 23:46=0A>>>>>Subject: Re: LF: Better picture of = the 807 based 500kHz TX=0A>>>>>=0A>>>>>2012/12/19 Graham :=0A>>>>>> =0A Why the=A0 stabilised=A0 screen=A0 supply ?= =0A>>>>>> =0A G..=0A>>>>>=0A>>>>>It's embarassing. I like the glow = of VR tubes! :-)=0A>>>>>=0A>>>>>73, Dimitris VK1SV=0A>>>>>=0A>>>>>=0A>>>>>= =0A>>>>>=A0=0A>>>>=0A>>>>=0A>>=0A>>=A0 =0A>=0A> --856002529-1551262948-1355943205=:10939 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
OK Graham
 
Good point! But it doesn't jump it chirps qui= te pleasently Louis PA0LCE runs one on = 500kc/s and tells me ops like the Retro sound.<= /font>
 
73 es GL Pete M0FMT IO91UX
From: Graham <g8fzk@g8fzk.fsnet.co.uk>
<= span style=3D"font-weight: bold;">To: rsgb_lf_group@blacksheep.o= rg
Sent: Wednesday, 1= 9 December 2012, 17:52
Subject: Re: LF: Better picture of the 807 based 500kHz TX
=0A=0A =0A =0A
=0A
Probably   a  e= arly  form  of  Spread =0ASpectrum  , hard to  JAM=    if is its  =0Ajumping   about the  band&nb= sp; and  difficult  =0Ato  make a  fake  transmiss= ion if the  Tx has a  =0Awobbly  bob  signature  := )
=0A
 
=0A
G..
=0A
=0A

=0A
=0A
From: = M0FMT
=0A
Sent: Wednesday, = December 19, 2012 5:42 PM
=0A
To: rsgb_lf_group@blacksheep.org =0A=0A
Subject: Re: LF: Better picture of the 807 based 500kHz =0A= TX
=0A

=0A
=0A
OK Mal
=0A
<= /span> 
=0A
Point taken. I was referring =0Ato a "Power" oscillator like a= single 6L6 used as an Xtal oscillator running at 15 / 20Watts which means = =0Anormally there is insuffi= cient =0Acurrent (really) from a VR tube for the =0AAnode(plate) s= o all that is necessary is to stab the screen. Otherwise I totally =0Aagree= .
=0A
I do know the standard T1154 chirps well. There= is a PA0 who runs one =0Aon 500 and I am sure you have worked him it = is like a signature signal =0AHI. 
=0A
I think t= here was some kind unpleasantness= going on at the time of the =0AT1154 manufacture so the=  fine points of frequency control was probably =0Aa low priority.
=0A
73 es GL Pete M0FMT IO91UX
=0A
=0A
=0A
=0A
=0A
= From: mal hamilton =0A <g3kevmal= @talktalk.net>
To: r= sgb_lf_group@blacksheep.org =0A
= Sent: Wednesday, 19 December =0A 2012, 11:55
Subject: Re: LF: =0A Better picture of = the 807 based 500kHz TX

=0A
= =0A =0A=0A
=0A
Hi Pete
=0A
Stabilise both Plate es Screen on a= n Oscillator, =0A followed by a Cathode follower to avoid chirp and osc pullin= g.
=0A
The T1154 was very unstable = with a bad chirp, surprised =0A it ever passed Quality Control=0A
G3KEV
=0A
 
=0A=
=0A
----- =0A = Original Message -----
=0A
From: =0A M0FMT
=0A =0A
Sent: =0A Wednesday, December 19, 2012 10:08 AM
=0A
Subject: =0A Fw: LF: Better picture of the 807 =0A based 500kH= z TX
=0A

=0A
=0A
=0A
 T= ry again minus cct too =0A big I think.

=0A
73 es GL Pete M= 0FMT IO91UX=
=0A
=0A
=0A
=0A ----- Forwarded Message =0A = -----
From: M0FMT &l= t;m0fmt@yahoo.co.uk>
To: "rsgb_lf_group@blacksheep.org" =0A <rsgb_lf_group@blackshe= ep.org> =0A
Sent: Wednesday, 19 =0A December 2012, 9:52
Subject: Re: LF: Better picture of =0A the= 807 based 500kHz TX

=0A
= =0A
=0A
=0A
Hi Dimitris and group
=0A
 
=0A
I have not seen the schematic but i= t is usual to stabilise the =0A screen of a power oscillator to reduce= chirp on key down.
=0A
Now you have shown us y= ours I will show you mine. I usually =0A sketch the schamatic after the = =0A event so foregive the presentation =0A on the back of an envelope= .
=0A
I now get at least 4Watts after adjusting= the ant link coupling =0A away from the chasis. Best audible =0A DX Kent= 80miles best Opera DX PA0 land.
=0A
73 es GL Pete M0FM= T IO91UX
=0A
=0A
=0A
=0A =
=0A
<= span style=3D"font-weight: bold;">From: Dimitrios Tsifakis <dtsifakis= @gmail.com>
To: rsgb= _lf_group@blacksheep.org =0A
Sent: Tuesday, 18 =0A December 2012, 23:46
Subject: Re: LF: Better picture of= =0A the 807 based 500kHz TX

2012/12/19 Graham &= lt;g8fzk@g8fzk.fsnet.co.uk>:
> =0A Why the  stabilised  screen  suppl= y ?
> =0A G..

It's embarassing. I =0A like the glow = of VR tubes! =0A :-)

73, Dimitris VK1SV



 




 
=0A


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