Date: Tue, 23 Mar 2010 14:09:59 +0100
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
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Subject: Re: LF: Re: DK7FC's 3rd VLF transmission
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Jim,

thanks for the circuit diagram for 9kHz the loop / preamp. That way I 
(and other) do not have to re-invent the wheel.
It would be nice to have an e-probe circuit diagram as well, any takers ?

73, Rik  ON7YD - OR7T

At 11:34 23/03/2010, you wrote:
>Dear Stefan, LF Group,
>
>...>Jim, M0BMU is the 2nd best DX distance! Jim, can you describe you RX
>detailed, pse. Or have i forgotten an older mail? What was the new /p QTH?
>And what are your observations about the change of QRM?...
>
>I was very pleased to be able to see a signal at my first serious attempt...
>I have attached the current schematic of the preamp/filter used on Sunday.
>
>The receive site was about 5km east of my normal QTH, I think the locator is
>IO91WR, but I'll check the exact coordinates.
>
>The /P site had considerably less man-made QRM than my home QTH. The odd
>31.5Hz/5Hz spectral lines seen at home were completely absent, but
>considerable 50Hz harmonics were present, due to nearby overhead power
>lines. But these did not really cause a problem on Sunday, and I think a
>noise-cancelling antenna arrangement would be feasible in a future test.
>
>...>BTW: We could philosophize what is the definition for "DX" on LF and
>VLF! Or is there a standard definition? In my ham licence i learned that on
>HF, DX is outside the own continent and on VHF it is above 300km. So, what
>is it for LF? And what for VLF (by hams)?...
>
>I think on HF nowadays, DX just means stations with unusual callsigns. On
>VLF, it probably should mean distances beyond those normally achieved -
>which means just about any distance at all!
>
>Cheers, Jim Moritz
>73 de M0BMU