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
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