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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <000c01c8e8c3$7e117840$0301a8c0@mal769a60aa920> <4880961E.4040803@ntlworld.com> <000901c8e8e0$f8d6bc80$693a2e40@p1i5f0> <4880B1E7.3040008@ntlworld.com> <000a01c8edb7$0174f7a0$713a2e40@p1i5f0> <004101c8edc4$b4bc9590$6401a8c0@asus>
Date: Thu, 24 Jul 2008 23:14:27 +0100
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Subject: Re: LF: RE: 600m Info
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Some thoughts on 600


The antenna systems and power levels needed to  establish communication on 
600 Mtr's are considerably smaller than 2200 , the tx power levels are 
compatible to  normal HF operation , in tests , 20 watts feeding a 35 ft top 
loaded system , using modern and not so  modern data systems have produced 
reliable copy both inside the apparent ground wave range of 60/70 miles ( A 
un expected phenomena resulting in 'beacon bedlam' a testing time south of 
Watford gap ) and in the intermediate skip ranges of 250+  and 500+ miles.

5 or 10 watts , giving a good trace at Johns most excellent internet linked 
panoramic monitoring station   located in the Shetland islands , some 600 
miles north of my qth , which at the moment can be observed a on going 
propagation experiment by  Finbar with compact antenna array, slightly 
closer (to me) is of course I think the original monitoring station 
established by Dave in Birmingham , which has proved invaluable as a remote 
monitor for those in ground wave range ,  some 500 mW being all that is 
required to  produce a trace

It is tempting to replicate vlf systems and launch them on  600 mtr , but in 
retrospect this might of been the result of operations rising from the lower 
bands and not , dropping down from top band, where it would of never 
occurred to any one using data  to  of deployed a non linear system, even 
with the deployment of the 'wspr' auto reporting beacon system, still 
requires either the use of a pic controlled dds  exciter or the linear 
translation of the sound card interface. linear translation in frequency 
that is , to  retain the very narrow fsk

The generation of power levels round the 100 watt , may be accomplished by 
any of the existing technology's   and where it is quite possible to  obtain 
high levels of efficiency with non-linear systems , in the long run the 
limitation this imposes on the types of modes that may be used, may, if 
taken into account at the off set , may of  resulted in a much higher take 
up


The only advice I would give is , If you can use top band , then you can use 
600 , you don't  need much power and keep your options open , keep it 
linear ... this opens up experimentation using all most anything ...


prologue


However If you have introduced logic in the transmitter drive chain , this 
rather well presented project by 'Jim may facilitate a change of mode?


Link's  :-


http://groups.google.com/group/uk500khz/web/eer-transmitting


http://uk500khz.googlegroups.com/web/EER_Transverter_v2.pdf?gda=t-IW0EcAAADreA3He7z-1zl0nx8aKTrkbPAui0z31g_35dksGVSJPGG1qiJ7UbTIup-M2XPURDT1pV1Og9oeqwS6db_U_lgaw8OU8Ap4Nqh177si8htneQ

Reference material listed on the EER  transmitting page of the  uk500khz 
news group.

--------------------------------------------------
From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
Sent: Thursday, July 24, 2008 8:37 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: RE: 600m Info

> Steve, LF,
>
> Re: "Scopematch"
>
> I built the "LF Tuning Meter" from Jim M0BMU for 136 KHz & I now use it 
> for
> 500 KHz & it works just as well.
>
> Quoting from the article :-
>
> "This LF tuning meter was conceived to perform the same function,
> but to be a simple, self-contained unit requiring no additional power
> supply."
>
> http://www.picks.plus.com/software/LFtunemeter.pdf
>
> Gary - G4WGT.
>
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Steve McDonald
> Sent: 24 July 2008 18:59
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: 600m Info
>
> Are there any web sites devoted to 600m circuits etc? I am aware of the 
> U.S.
> group one as well as G3YMC's page and N4ICK's tx design, but perhaps there
> are others as well?
>
> Several of the 2200m experimental licencees have just been asked to submit
> formal proposals for 600m experimental permits here in Canada so things 
> are
> starting to look positive but I have no idea of the timeline. Just in 
> case,
> I thought I had better get the soldering iron warmed-up once again, not 
> that
> it has ever really cooled-off.
>
> Also...does anyone know how well the M0MBU scope match circuit (that works
> so wonderfully-well on 2200m) performs on 600m without any modification?
>
> Steve / VE7SL
>
> Web: "THE VE7SL RADIO NOTEBOOK" at   http://www.imagenisp.ca/jsm
>
>
>
>
>
>
>
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>
>