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Total 98 documents matching your query.

1. Re: LF: QRSS at ~475.560 whois? (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 21 Nov 2014 13:09:52 +0100
Big ear in Moskow! ;-) I confirm. IQ2MI/B JN45NL QTH: Milano ARI Milano Radio Club ERP unknown, the antenna is tuned for the old frequency 501 kHz! 73 de Claudio IK2PII -- Claudio Pozzi - rispondere
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00236.html (18,486 bytes)

2. Re: LF: QRSS at ~475.560 whois? (score: 1)
Author: Claudio Pozzi <>
Date: Sat, 22 Nov 2014 18:57:27 +0100
We are testing a new transmitter after the MOSFET death, but we have some problem with the keyer. May be 1 or 2 weeks. Of course! We are building the CW/QRSS/DFCW keyer with Arduino. And the exiter s
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00243.html (10,842 bytes)

3. Re: LF: QRSS at ~475.810 whois? (score: 1)
Author: Claudio Pozzi <>
Date: Sun, 23 Nov 2014 11:53:43 +0100
We can set any frequency, resolution is 0.1 Hz; what is your preference? Claudio ik2pii -- Claudio Pozzi - rispondere a -- Z-Light e Z-Pro: servizi zimbra per caselle con dominio em
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00247.html (12,355 bytes)

4. LF: IQ2MI 630m beacon at 476.180 kHz QRSS30 (score: 1)
Author: Claudio Pozzi <>
Date: Wed, 24 Dec 2014 09:49:05 +0100
New beacon configuration. Exciter, 24 hour powered: Exciter: Adret-Electronique mod. CS201 SB Frequency: 476.180 kHz Resolution: 0.1 Hz Frequency stability: 2x10^-8/24h, after 8 h (about +- 0.01Hz) E
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00257.html (12,376 bytes)

5. Re: LF: New version OPERA >> ''Opera Dynamic'' << (score: 1)
Author: Claudio Pozzi <>
Date: Thu, 8 Jan 2015 20:25:02 +0100
My old dream! Brain waves DX on 136 kHz. This is wireless! ;-) Claudio ik2pii -- Claudio Pozzi - rispondere a -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it,
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-01/msg00190.html (12,386 bytes)

6. Re: LF: Opera improving (score: 1)
Author: Claudio Pozzi <>
Date: Mon, 12 Jan 2015 16:11:48 +0100
Hi Mike. I don't know Opera but this is my 2 bit "guesswork" ;-) Does the Deep Search decision making algorithm compute a confidence numerical score? If not can compute it? So, normalize the score be
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-01/msg00266.html (10,812 bytes)

7. Re: LF: WSPR MF please (score: 1)
Author: Claudio Pozzi <>
Date: Mon, 9 Feb 2015 20:58:34 +0100
You should say "20m short coax cable" ;-) = 0.032 wavelength! In my opinion if the cable is shorter than 0.1 wavelength and low loss VSWR doesn't matter. 73 de Claudio IK2PII -- Claudio Pozzi - risp
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-02/msg00092.html (14,603 bytes)

8. LF: VLF eclipse report (score: 1)
Author: Claudio Pozzi <>
Date: Sun, 22 Mar 2015 20:08:41 +0100
Here my report about VLF (<24 kHz) propagation during the eclipse. http://ik2pii.altervista.org/Eclissi/Eclissi_en.htm 73 de Claudio IK2PII -- ZE-Light e ZE-Pro: servizi zimbra per caselle con domini
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-03/msg00275.html (9,778 bytes)

9. Re: LF: MF 630m: False Decode or Real? (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 22 May 2015 13:38:56 +0200
What happens if someone flood the internet 'deep search' channel wit a lot of fake callsign etc etc? Can someone test this flood? 73 de Claudio IK2PII -- Claudio Pozzi - rispondere a
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00179.html (16,630 bytes)

10. Re: OT - VLF: Tweek mode resonances (score: 1)
Author: Claudio Pozzi <>
Date: Thu, 23 Jul 2015 18:14:11 +0200
Hi Stefan this remember me a "CERN style" balun attached! I suggest you a QSY near Geneva ;-) 73 de Claudio ik2pii -- Claudio Pozzi - rispondere a -- ZE-Light e ZE-Pro: servizi zim
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00113.html (15,648 bytes)

11. Re: LF: Time server with delay option? (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 02 Oct 2015 14:06:47 +0200
... an hardware powerful tool: https://en.wikipedia.org/wiki/Thiotimoline ;-) 73 Claudio ik2pii -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00017.html (10,050 bytes)

12. Re: LF: EbNaut and The Cat / Take 3 (score: 1)
Author: Claudio Pozzi <>
Date: Wed, 25 Nov 2015 21:10:37 +0100
Prad = i^2 * 1579 ohm * (h / lambda)^2 My 2 dB contribute: h in meters (or ft) lambda in meters (or ft) so (h / lambda) is dimensionless scaling factor confirmed by P = i^2 * R Or not? 73 Claudio ik2
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00571.html (16,379 bytes)

13. Re: LF: Beware damage from active antennas (score: 1)
Author: Claudio Pozzi <>
Date: Thu, 03 Dec 2015 17:29:27 +0100
For sharp spikes coming out from the cable I suggest some ferrite bead or a VK200 choke on the receiver input. I believe they have no attenuation at LF frequency. 73 de Claudio ik2pii -- Claudio Poz
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00051.html (14,234 bytes)

14. Re: LF: Real DX (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 13 May 2016 11:57:35 +0200
The distance is about 3 billion km, say 10000 seconds light. Round trip time twice. Send K, sleep 5.5 hour ... and the antenna is in shadow side... Tx here and Rx over the pound! Claudio ik2pii -- Z
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00091.html (17,686 bytes)

15. Re: LF: Re: Cumiana OOS (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 24 Jun 2016 16:50:55 +0200
HI Stefan I suggest neon sign transformer https://en.wikipedia.org/wiki/Neon-sign_transformer 15 kV and 50 mA at 50-60 Hz but I don't know what happen at 3 kHz. 73 de Claudio ik2pii -- ZE-Light e ZE-
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-06/msg00093.html (10,050 bytes)

16. Re: LF: Audio link (score: 1)
Author: Claudio Pozzi <>
Date: Wed, 12 Oct 2016 16:37:23 +0200
The AC 230 power supply in the shack and the desktop computer grounding wire are equipotential, share the same grounding system? 73 de Claudio ik2pii -- ZE-Light e ZE-Pro: servizi zimbra per caselle
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00149.html (11,799 bytes)

17. Re: ULF: Finally 100 mA on 2.97 kHz / 65 km ULF experiment (score: 1)
Author: Claudio Pozzi <>
Date: Fri, 09 Dec 2016 17:15:52 +0100
May be a crazy idea... but the atmosphere refractive index (and light speed and wavelength) change a little with pressure, temperature and humidity. 50 uHz at 3 kHz are 1.7e-8 so may be you can dete
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00122.html (15,371 bytes)

18. LF: interesting paper about VLF & LF & MF propagation (score: 1)
Author: Claudio Pozzi <>
Date: Thu, 26 Jan 2017 13:36:44 +0100
http://www.navy-radio.com/manuals/0101-1xx/0101_113-02.pdf 73 de Claudio IK2PII -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli clicca qui Sponsor: Caselle
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00237.html (10,729 bytes)

19. Re: LF: A transductor for power regulation? (score: 1)
Author: Claudio Pozzi <>
Date: Wed, 19 Apr 2017 19:12:28 +0200
Your circuit is a magnetic amplifier. This book is useful. https://archive.org/details/MagneticAmplifiers 73 Claudio ik2pii -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00287.html (15,426 bytes)

20. Re: LF: A transductor for power regulation? (score: 1)
Author: Claudio Pozzi <>
Date: Thu, 20 Apr 2017 21:02:24 +0200
Some idea for the transformer... May be that a small toroidal transformer core for mainline power supply can be useful for 2 and 6 kHz bands. But toroid are without transformer air gap. A core from
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00299.html (14,717 bytes)


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