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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+noise\s+on\s+VK\s+and\s+earth\s+dipole\s+tests\s*$/: 15 ]

Total 15 documents matching your query.

1. Re: LF: noise on VK and earth dipole tests (score: 1): Author: John Rabson <[email protected]>; Date: Sat, 15 Oct 2011 18:43:46 +0200; The more the better up to 6 or 7 rods. From cave radio tests we find that the earth rods need to be spaced by 2 or more times their depth. John F5VLF; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00017.html (11,023 bytes)
2. LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Wed, 12 Oct 2011 08:37:03 +1100; Hi Stefan, Last two or three days have been rather noisy, yesterday I had to turn down the volume of the receiver as the static was reaching annoying levels. But hey, transmitting _is_ fun and I am s; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00025.html (13,617 bytes)
3. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Sat, 15 Oct 2011 18:34:33 +1100; Hi Stefan, I followed up your suggestion of elevating the wire off the ground and it seems that there is some benefit in doing that: http://people.physics.anu.edu.au/~dxt103/136/earth/3/ However, it'; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00094.html (11,678 bytes)
4. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Thu, 13 Oct 2011 08:47:30 +1100; Hi Stefan, I have read your adventures in the "dreamer's band" and I admit it has been very inspiring. Yes, I am planning some VLF activity soon. I have already got a kW capable audio amplifier, so a; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00224.html (14,344 bytes)
5. Re: LF: noise on VK and earth dipole tests (score: 1): Author: John Rabson <[email protected]>; Date: Wed, 12 Oct 2011 11:10:24 +0200; In the early days of 73 kHz, someone achieved naerly 400 km with an earth current system. John F5VLF; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00242.html (10,319 bytes)
6. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Thu, 13 Oct 2011 17:26:35 +0200; Hi Dimitris, Am 12.10.2011 23:47, schrieb Dimitrios Tsifakis: Was the 450 km reception done during the day or night? It was in the evening. The mail and screenshot is in one of the 1000s of mails her; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00318.html (16,829 bytes)
7. Re: LF: noise on VK and earth dipole tests (score: 1): Author: John Rabson <[email protected]>; Date: Wed, 12 Oct 2011 15:23:14 +0200; Hi Dimitrios, Depending on what you are doing it may be inverse cube law (9 dB). 73 John F5VLF; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00413.html (11,596 bytes)
8. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Wed, 12 Oct 2011 12:35:53 +0200; Hi Dimitris, Sorry, have lost your mail in the large ammount of mails yesterday ;-) Am 11.10.2011 23:37, schrieb Dimitrios Tsifakis: Hi Stefan, Last two or three days have been rather noisy, yesterda; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00436.html (13,745 bytes)
9. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Sat, 15 Oct 2011 18:53:17 +0200; Hi John, Yes, the more the better. If it is just one rod and the overall losses would be 450 Ohm, i expect a high ground conductivity which would be worse for an earth antenna... Maybe the elevated w; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00441.html (12,318 bytes)
10. Re: LF: noise on VK and earth dipole tests (score: 1): Author: John Rabson <[email protected]>; Date: Wed, 12 Oct 2011 10:07:48 +0200; hi Dimitrios, Amongst other things, it depends on the geology. G3XBM has managed 5.6 km with 5 W RF at very low frequency. On 87 kHz with 4W SSB (cave radio) in limestone, the best I know of is 1.6 k; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00461.html (10,350 bytes)
11. Re: LF: noise on VK and earth dipole tests (score: 1): Author: "mal hamilton" <[email protected]>; Date: Wed, 12 Oct 2011 10:29:19 +0100; Earth probes not suitable for DX but good for cave exploration, looking for Bats and the Loch Ness Monster g3kev hi Dimitrios, Amongst other things, it depends on the geology. G3XBM has managed 5.6 k; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00497.html (10,809 bytes)
12. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Wed, 12 Oct 2011 20:20:15 +1100; Hi John, Well, the S/N required for voice is much higher than that of QRSS30. With a puny 3 W of RF and QRSS30 it seems I can cover a distance of about 30 km and still have a S/N of 30 dB! Which impl; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00548.html (11,608 bytes)
13. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Sun, 16 Oct 2011 07:29:31 +1100; Hi John and Stefan, I know that the electrodes can be improved, the ones I used are 1 m long galvanized rods, driven 2/3 or so in the ground. But at this stage, I wanted to keep all but one parameter; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00718.html (13,776 bytes)
14. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Sat, 15 Oct 2011 14:14:11 +0200; Hello Dimitris, Very interesting and nice to read experiments and web page! Good to see some experimenters beeing available. Some questions and ideas: How do you ground the earth antenna at the end?; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00749.html (13,851 bytes)
15. Re: LF: noise on VK and earth dipole tests (score: 1): Author: Dimitrios Tsifakis <[email protected]>; Date: Thu, 13 Oct 2011 08:48:36 +1100; Hi John, Would that be the attenuation expected for signal travelling strictly in the ground? 73, Dimitris VK1SV; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-10/msg00791.html (11,265 bytes)

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