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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+VLF\s+in\s+VO\s*$/: 17 ]

Total 17 documents matching your query.

1. LF: VLF in VO (score: 1)
Author: [email protected]
Date: Mon, 23 Nov 2015 15:20:05 -0330 (NST)
Following last night's misadventure, the VLF/LF/MF exciter seems to be recovering. On VLF, CW on 8.277 kHz was heard at just over 1 km using a crude DC receiver and a miniwhip. NAA on 24 kHz was loud
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00529.html (9,218 bytes)

2. Re: LF: VLF in VO (score: 1)
Author: Paul Nicholson <[email protected]>
Date: Mon, 23 Nov 2015 19:28:33 +0000
Great. My rx is recording again with a fresh charge in the battery. Should I be looking for your carrier? Can you reach 20uW ERP, GPS locked? If so, try sending 2 hours of unmodulated carrier between
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00530.html (10,369 bytes)

3. Re: LF: VLF in VO (score: 1)
Author: DK7FC <[email protected]>
Date: Mon, 23 Nov 2015 23:19:52 +0100
Am 23.11.2015 20:28, schrieb Paul Nicholson: [...] It would be great to see some VLF activity. Very little sign of amateur activity seen here lately. Except for http://abelian.org/vlf/fbins.shtml#p=1
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00534.html (10,700 bytes)

4. Re: LF: VLF in VO (score: 1)
Author: Domenico IZ7SLZ <[email protected]>
Date: Tue, 24 Nov 2015 00:22:21 +0100
Hi Joe and all Group. I'm also recording around 137777.00 Hz and i will try to read Joe's EbNaut message tomorrow morning. Just confirm with an email the starting  time of each  transmissions and if
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00536.html (11,961 bytes)

5. Re: LF: VLF in VO (score: 1)
Author: [email protected]
Date: Mon, 23 Nov 2015 20:28:14 -0330 (NST)
Hi Paul, The tuning coil is rather small and lossy. The best range is 5 km using a DK7FC E probe and Spectrum Lab with QRSS100. I don't have a GPSDO yet, but Markus says the dual oven osc should be s
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00537.html (11,506 bytes)

6. Re: LF: VLF in VO (score: 1)
Author: [email protected]
Date: Mon, 23 Nov 2015 20:30:31 -0330 (NST)
Hi Domenico, Thanks for watching. 8K19A 2 s symbols 7 characters. Next start time 0000 UTC 24 Nov. Just started! 73 Joe VO1NA Hi Joe and all Group. I'm also recording around 137777.00 Hz and i will t
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00538.html (11,351 bytes)

7. Re: LF: VLF in VO (score: 1)
Author: Paul Nicholson <[email protected]>
Date: Tue, 24 Nov 2015 08:17:06 +0000
For both messages I got an 'all-star' decode 23:00 found rank 0: ** ps [ 8 -60 -60 -60 -60] re-encode 167/608 ber 2.75e-01 Es/N0=-7.4 Eb/N0=4.2 23:20 found rank 0: ** ps [ 0 0 0 0 0] re-encode 1/608
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00539.html (11,538 bytes)

8. Re: LF: VLF in VO (score: 1)
Author: Markus Vester <[email protected]>
Date: Tue, 24 Nov 2015 06:42:42 -0500
The cat sat under the stars... Confirming Paul's observation. The strong unmodulated carrier was well visible in the grabber spectrograms. Got an error-free ** decode of the 0:00 transmission: found
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00540.html (13,648 bytes)

9. Re: LF: VLF in VO (score: 1)
Author: IZ7SLZ <[email protected]>
Date: Tue, 24 Nov 2015 18:40:36 +0100
Hi Joe, This are EbNaut results of your carrier well received here in JN80NU (QRB=5400 km): found ** list rank 0 reference phase    0    0    0    0 carrier RMS 4.628e+005 noise RMS 1.827e+004 carrie
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00541.html (14,858 bytes)

10. LF: VLF in VO (score: 1)
Author: [email protected]
Date: Sun, 20 Dec 2015 16:16:06 -0330 (NST)
It was a nice but windy day today so the VLF TX was put on the air for a quick test. About 30 watts were fed to a 5:1 XFMR and a ~0.35H tuning coil to the 100m wire at 10m height. CW signals were hea
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00357.html (10,924 bytes)

11. Re: LF: VLF in VO (score: 1)
Author: Paul Nicholson <[email protected]>
Date: Sun, 20 Dec 2015 21:39:57 +0000
How about a long carrier, GPS or rubidium? It's a long shot but it's a low loss path and the time of year is good for several hours of coherent integration. I can easily see 10uW from 1000km in one
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00361.html (11,320 bytes)

12. Re: LF: VLF in VO (score: 1)
Author: Dimitrios Tsifakis <[email protected]>
Date: Mon, 21 Dec 2015 09:21:03 +1100
Hi Joe, thanks for sharing your experiment details. I have been doing similar tests on VLF, using about 120 m of wire, about 10 m of the ground. I have used initially much less power, so signals disa
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00362.html (12,584 bytes)

13. Re: LF: VLF in VO (score: 1)
Author: "Markus Vester" <[email protected]>
Date: Sun, 20 Dec 2015 23:20:33 +0100
Yes Paul, that sounds like a very reasonable proposal. Joe's OCXO is obviously stable enough for the task, all that's needed there is a different frequency word for the DDS. And considering the anten
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00363.html (13,207 bytes)

14. RE: LF: VLF in VO (score: 1)
Author: <[email protected]>
Date: Sun, 20 Dec 2015 17:56:24 -0500
Paul, Ref: " I can easily see 10uW from 1000km in one hour over a path with a lot of land. West to east over water will be lower loss and four or six hours integration will make up for the lower ERP.
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00364.html (12,653 bytes)

15. Re: LF: VLF in VO (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 21 Dec 2015 20:44:14 +0100
Adding to what Paul says I have found that NEC needs to be treated with caution even higher in the LF range. Another thing to remember is that the skin depth at these VLF frequencies is quite signifi
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00371.html (15,210 bytes)

16. Re: LF: VLF in VO (score: 1)
Author: Paul Nicholson <[email protected]>
Date: Mon, 21 Dec 2015 14:28:26 +0000
The radiator, although a horizontal wire, is practically a vertical polarised Hertzian dipole with the ground as one pole and the wire as the other. Horizontal polarisation suffers very high attenuat
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00373.html (13,791 bytes)

17. Re: LF: VLF in VO (score: 1)
Author: [email protected]
Date: Mon, 21 Dec 2015 20:25:38 -0330 (NST)
Hi Paul and thanks very much for the data. Unfortunately, after the experiment, the aerial current had decreased to zero. It seems a short developed in the tuning coil. A better design is being consi
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00396.html (12,259 bytes)


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