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Date: Sun, 11 Oct 2015 16:46:50 +1100
Message-ID: <CAKvcm2cJDkUCZsZSXqgOB+Quu+bvD25nkadp1FGaYO5r_VAeVw@mail.gmail.com>
From: Dimitrios Tsifakis <dtsifakis@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: QRSS/DFCW transmission with a Raspberry Pi
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Status: O

Hi Stefan,

>> Hmm, that's about 2 km of wire, my place is not big enough, but the
>> people around me seem to be quite friendly, so I guess it's possible.
>> What sort of wire would you use for this?
>>
>
> Well i'm not an expert on beverage antennas. Not at all. I even never built
> one :-)
> But i expect the wire diameter, i.e. the wire losses are not critical. There
> are some interesting new pages about DX antennas on 630m in the web. Worth
> to study.
> What is your new locator?

By chance, and after I picker the COW callsign, I discovered that the
QTH locator is the  appropriate QF44ox :-)

> I would start to place the wire, and play with the termination resistance. I
> guess that 5m above ground is a good choice? Or maybe it doesn't matter so
> much because the skin depth on 630m is larger then on 80m/160 anyway? So
> maybe it is not necessary to lift the wire at all? It will depend on the
> ground conductivity. So i would lay the isolated wire just on the ground and
> start that way. Interesting.
> Some simulations could be helpful as well.

There is a lot to consider. I am still unpacking boxes here, so I have
been rather inactive radio wise. One of my intentions is to get some
VLF activity happening from here. The place is rather undulating and
there are many opportunities for some sort of large, across-the-valley
type antennas.

AW, I have sent you the early beta of the QRSS software for Pi, for
testing. Needless to say, test thoroughly before you put into service
:-)

73, Dimitris VK2COW