Message-ID: <008e01cd61fe$928e7710$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4FFF49E4.3040604@iup.uni-heidelberg.de>, <1953BDD65F0E4832AF043E22C05F5650@AGB>, <4FFF5E95.6020706@iup.uni-heidelberg.de> <5001A14A.30585.1055DF9@mike.dennison.ntlworld.com> <3276F2210AEA4C14843256CE9A603133@AGB>
Date: Sat, 14 Jul 2012 20:23:46 -0000
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Subject: Re: LF: LF OP32 to VK??
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Graham
If you wind a 150mH loading coil for me I could be on next day !! I have
already resonated my LF antenna for 8.9 Khz using small ferrite core loading
coils and signal generator. It works and is also hot on RX
I need a big coil to handle a QRO amplifier which I already have. I can
guarantee you a signal


mal/g3kev

----- Original Message -----
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, July 14, 2012 8:06 PM
Subject: Re: LF: LF OP32 to VK??


> ''Coupled with this, there are relatively short periods of very good
> conditions amongst the QSB which could be taken advantage of by a
> faster speed.''
>
> Mike,
>
> That's the  $64,000  question  , is there  enough   burst  time  in the
> cycle to  exceed the  -40 dB  lower threshold , but  -40  is the  average
> along the  time  line , like  stocks and shares the  signal  can   move
up
> and down , round  this  point , the  same  dsp  engine is decoding  at -50
> dB  at  4 hours  in the  experimental   8KHz  mode , still  waiting  for
MAL
> to sort  his  licence  out  (HIHI) we  have the  600  ft loop  this  side
of
> the  hill.
>
> I believe the  path  loss  is  in the  order of  40 dB ,  so  who knows ,
> Gary crossed  the  Atlantic  with  300 watts  to a   30  ft  top loaded
> vertical, using  OP8  ,looking  at the  screen  captures  10 dB  variation
> in signal  can be  seen
>
> But I think  there will  be a  lot of  stations  tuned in  during  the
> tests, what  ever the  outcome !
>
> 73 -Graham
>
>
http://groups.yahoo.com/group/O_P_E_R_A_/photos/album/2031588689/pic/7820982
76/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> --------------------------------------------------
> From: "Mike Dennison" <mike.dennison@ntlworld.com>
> Sent: Saturday, July 14, 2012 4:41 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: LF OP32 to VK??
>
> >> So do you and others think there will be a chance compared to
> >> DFCW-180? The next VK season may start in 6 weeks or so...
> >> 73, Stefan/DK7FC
> >
> > Op32 has been tested as roughly equivalent to QRSS10, so would be
> > unlikely to produce a good enough signal/noise for DL-VK.
> >
> > The dilemma of LF DX: is that you need to use a very narrow bandwidth
> > to get the S/N, so you need a very slow mode. However, the periods of
> > good conditions are not open for very long, so you need a faster
> > mode.
> >
> > Coupled with this, there are relatively short periods of very good
> > conditions amongst the QSB which could be taken advantage of by a
> > faster speed.
> >
> > Ideally you need a mode that will accumulate the results from several
> > periods of good reception over a few hours or even over several days.
> >
> > Mike, G3XDV
> > ==========
> >
> >
>