Message-ID: <002f01c2bf13$1efa5000$1700a8c0@home>
From: "Dave Pick" <g3yxm@wireless.org.uk>
To: rsgb_lf_group@blacksheep.org
References: <74S2VLF93VUXSTQGSM09USTSNL3YJF.3e29837a@Charlie_Drake>
Date: Sat, 18 Jan 2003 17:00:28 -0000
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Subject: Re: LF: LF T/A
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Steve.

Yes it's excellent. laurie and I did try some T/A tests last night but were
diappointed by the results around 0000utc and went off. It looks from your
latest graph that we should have persevered! The sig/noise at 0600 looks
very good. You need to couple that s/n figure to a big bell in our bedrooms!

Cheers.
Dave Pick
G3YXM.
----- Original Message -----
From: "Steve Dove" <dsp@hifidelity.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, January 18, 2003 4:40 PM
Subject: Re: LF: LF T/A


> Greetings, fellow static-heads,
>
> Having just returned from a week long business trip to find that
> w3eee.com was still working(!) I'm also gratified to see that it is
> of use . . .   also amazed by the great propagation it captured
> last night.
>
> (1)  Daytime noises
>
> As Peter queried and Alan correctly answered, the daytime
> noises evident are switch-mode 'squirglies' and the odd electric
> drill from construction down the road.  When I'm here (w3eee.com
> is in my downstairs office) I'm able to 'police' the house for known
> grotties that have otherwise not been fixed, 'retired' or 'broken'.
> These are the ones that require 'social engineering' to keep under
> control.  There is a bad one from an adjacent property (300' away)
> about which nothing much can be done.
>
> That said, it is fairly clear if the 'squirglies' are causing false
readings;
> that is the purpose of the 'control' traces from adjacent frequencies.
> And since the 'squirglies' really only affect measurements when no-one
> in their right mind is going to be attempting transatlantic QSOs, for
> the immediate purpose they really don't matter;  obviously for the
> science aspect, they have to go.  This is going to involve a new
> antenna, further away from houses  -  since we're still armpit deep
> in snow, and the weather-man's favourite utterance of late is
> "single digits!" (of degrees Fahrenheit) this isn't going to happen
> any time soon . . .
>
> Incidentally, the signal strength 'bloom' centered around 1400z
> on today's graph is real, and not a 'squirgly'  -  note that the
> noises are well below the DCF trace.
>
> (2)  Data clipping
>
> As Alan has noted,  some traces show suspicious signs of the
> measuring system clipping, or 'topping out';  this can be seen at
> about the -8dB level on the 'Scorcher!' trace, and at 0700z+ on
> the present trace. The actual data figures behind these traces
> still show signs of wiggle, so, I'm really not sure.  However, since
> there is 'plenty of room' at the low-level end of the graph, at the
> next reasonable opportunity (i.e. when the 'puter falls over next)
> I might spend the time to recalibrate it down 10dB, as per Alan's
> suggestion.
>
> Don't worry.  I'll let you know if it happens, just so that people
> won't assume the band's over for the season!
>
>         Cheers,
>
>                 Steve
>
>
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>