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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: Re: DK7FC's 3rd VLF transmission |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 23 Mar 2010 10:34:56 -0000 |
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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 Moritz73 de M0BMU
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