Message-ID: <4EF212B5.7040807@iup.uni-heidelberg.de>
Date: Wed, 21 Dec 2011 18:09:09 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: A certain law
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Hi Laurence, LF,

For LF/p i'm using a Samsung N150 Netbook which actually runs 8 hours 
non stop on batteries. It causes no QRM at all of LF/VLF and has a 
soundcard sampling at 96kS/s, 24 bit. Costs about 300 Euro 2 years back 
and is very lightweight. Optimal!
It is even possible to supply my /p RX from the USB by using a DC/DC 
converter (that adds no noise to the band too)! The best choice for me 
in combination with the ferrite antenna. See 
http://dl.dropbox.com/u/19882028/LF/LF-P%20RX%20RIG.JPG

73, Stefan

PS: Supplied by a homemade SMPS running on a 12V car battery i measured 
15 watts maximum power consumption (while running a SpecLab instance), 
so not much than 1A!

Am 21.12.2011 16:46, schrieb Laurence KL7UK:
> Just as I was leaving the Oklahoma residence my screen went Black on 
> the Dell 610  :-(  - seems to be a common failiure mode and looks like 
> the Hv inverter fail behind the Dell logo on the screen. This is the 
> unit I use for mobile and portable work and is getting rather long in 
> the tooth anyway -
>
> I need to buy myself an early birthday present but want to find one 
> with a "quieter" screen - most of the back lit fluor displays 
> produce 35-50kHz + harmonics switching signal which can cause E/M QRM 
> in the mobile environment or locations where signal currents arent 
> going the way you want them. Any suggestions for a reasonable "quiet" 
> at LF/MF tried and tested laptop that could be used for our sport - 
> preferably with serial but not exclusive. Obviously longer battery 
> life the better too
>
> I fear the purchase will be after Santa is on his holidays. With thanks
>
> Laurence KL7UK

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Hi Laurence, LF,<br>
<br>
For LF/p i'm using a Samsung N150 Netbook which actually runs 8 hours
non stop on batteries. It causes no QRM at all of LF/VLF and has a
soundcard sampling at 96kS/s, 24 bit. Costs about 300 Euro 2 years back
and is very lightweight. Optimal!<br>
It is even possible to supply my /p RX from the USB by using a DC/DC
converter (that adds no noise to the band too)! The best choice for me
in combination with the ferrite antenna. See
<a class="moz-txt-link-freetext" href="http://dl.dropbox.com/u/19882028/LF/LF-P%20RX%20RIG.JPG">http://dl.dropbox.com/u/19882028/LF/LF-P%20RX%20RIG.JPG</a><br>
<br>
73, Stefan<br>
<br>
PS: Supplied by a homemade SMPS running on a 12V car battery i measured
15 watts maximum power consumption (while running a SpecLab instance),
so not much than 1A! <br>
<br>
Am 21.12.2011 16:46, schrieb Laurence KL7UK:
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  <div dir="ltr">Just as I was leaving the Oklahoma residence my screen
went Black on the Dell 610&nbsp; :-( &nbsp;- seems to be a common failiure mode
and looks like the Hv inverter fail behind the Dell logo on the screen.
This is the unit I use for mobile and portable work and is getting
rather long in the tooth anyway - <br>
&nbsp;<br>
I need to buy myself an early birthday present but want to find one
with a "quieter" screen - most of the back lit fluor displays
produce&nbsp;35-50kHz + harmonics switching signal which can cause E/M QRM
in the mobile environment or locations where signal currents arent
going the way you want them. Any suggestions for a reasonable "quiet"
at LF/MF tried and tested&nbsp;laptop that could be used for our sport -
preferably with serial but not exclusive. Obviously longer battery life
the better too <br>
&nbsp;<br>
I fear the purchase will be after Santa is on his holidays. With thanks<br>
&nbsp;<br>
Laurence KL7UK<br>
  </div>
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