Message-ID: <4B9F82C9.3000301@abelian.org>
Date: Tue, 16 Mar 2010 13:08:25 +0000
From: Paul Nicholson <vlf0308@abelian.org>
User-Agent: Thunderbird 2.0.0.14 (X11/20080421)
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <000001cac47a$f4ba1350$0202a8c0@laptopcore2> <E2DAF94B7561449DA86210B16A68F704@JimPC> <38A51B74B884D74083D7950AD0DD85E82A1B57@File-Server-HST.hst.e-technik.tu-darmstadt.de>
In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B57@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Subject: Re: AW: LF: DK7FC's 2nd VLF TX test...
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Stefan schrieb:
 > I will detailed describe now what happend on this experiment.
 > ...

Thanks, that was a good field trip in the best amateur radio
tradition.  Ironic how we are at the same time using the most
hi-tech, but also the simple batteries, kites, wires, big coils, etc
that Marconi would have been quite at home with.  It is a nice
mixture.

What is the exciter you are using - the silver box with the LCD
display?

And when the kite is up and tied to the car, and the wind picks up,
how do you pull it down again - do you have a winch - or a knife?

Your website mentions improvements for the next run, what do you
have in mind?

 > So, what is the new WR?

Sorry, only about 16km - so far!

Perhaps the authorities can issue shorter callsigns for QRSS
300 operation?   Practically, send the callsign rapidly for
station ID, then slowly send one or two random code letters to
constitute a message which can be verified for record purposes.
DX receivers may cheat by looking at online spectrograms
of course!   FSK should be better than simple keying.

 > And what do you expect is possible at night?

Signals should go a lot further, but the rx has a torrent of
sferics to deal with.  We will have to see.

I think the ERP is about the same power as a small LED,
or less?  Amazing to think that is detectable 850km away.

A puzzle is the excess signal strength, further independent
rx measurements are required.

If anyone is transmitting from home (uQRP?), I can set up very
long non-coherent averaging (days?).  That is something else
to try for someone.  An alternative to sending messages serially
is to send data bits in parallel, multi-frequency, the whole
message received in one long averaging.   Many things to try!
-- 
Paul Nicholson
--