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| To: | [email protected] |
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| Subject: | Re: LF: Re: Luxembourg |
| From: | Markus Vester <[email protected]> |
| Date: | Thu, 15 Jan 2009 05:09:16 -0500 |
| In-reply-to: | <[email protected]> |
| References: | <F4E8A04C3CBA4C67AE9C3318F2F40C4F@JimPC><[email protected]><0F3DBBAC61C545AE85525CD884B642EC@Black><20090114231729.6b8aea4f@lurcher><2AD1A31DF27448F495C0CE7FF33CE9DE@Black><C4F6E432D5814955A1FDD42B0279F472@AGB><1E6D0A88C4DE49E5A2AF05911187E7A3@Black><89A232DF7CE7420380CD8B9E9AE1FA79@Black><[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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what the ICM products look like in a spectrogram of course depends on the FFT resolution. The narrow events were created by test tone modulation on the broadcast transmitter (probably 225 kHz but I didn't listen). Such tones are often transmitted some time after local midnight for a couple of minutes. The sub-Hz line linewidth was probably defined by a slight audio frequency drift of the tones, in addition to the 0.1 Hz broadening of the DCF /HGA carriers themselves due to the FSK telegrams. The more typical musical tones create strips and patches that are several Hz to tens of Hz wide. So they have a somewhat similar appearance, but on a wider frequency and faster time scale. You can often see them on the fullband panel of my colour DF grabber - red above HGA22 (135.43 kHz) and purple below DCF39 (138.83). However with millihertz resolution (e.g. QRSS-60), they mostly appear as temporarily increased noise. 73, Markus -----Ursprüngliche Mitteilung----- Von: John RABSON <[email protected]> An: [email protected] Verschickt: Do., 15. Jan. 2009, 10:30 Thema: Re: LF: Re: Luxembourg Markus, Lubos, Are these light-coloured patches a typical signature of this effect? I get quite=2 0a lot of them here. John F5VLF *********** REPLY SEPARATOR *********** On 15/01/2009 at 03:32 Lubos OK2BVG wrote: >Hello Markus, LF! >Many thanks for your info about Russian Loran (GRI 8000), it´s this! > >Here is my picture of Luxembourg effect in JN88KS. Very strong signal. > >Lubos, OK2BVG > >************************************************** > >> From: [email protected] >> To: [email protected] >> Date: Thu, 15 Jan 2009 01:22:41 +0100 >> Subject: LF: Re: Luxembourg >> >> .. this is the cross modulation signature on the RN3AGC grabber. The >pattern was also visible on F1AFJ's screen. - 73, Markus >> >> ----- Original Message ----- >> From: "Markus Vester" <[email protected]> >> To: <[email protected]> >> Sent: Thursday, January 15, 2009 12:52 AM >> Subject: LF: Re: WSPR beacon on 136kHz, Luxembourg >> >> >> The band is fairly quiet tonight. Twice for a few minutes around 23:23 >and 23:33, there were strong Luxembourg sideband carriers >> simultaneously on both HGA and DCF. They were apparently caused by a >1054 Hz sinusoidal modulation test tone (sidebands at 136.484, >> 75 uV/m and 137.776 kHz, 13 uV/m). There was also a -20=2 0dB second >harmonic component (137.538, 6 uV/m and 136.722, 1.5 uV/m), due >> to >> the square-law charasteristic of the heating effect. >> >> Kind regards, >> Marksu, DF6NM >> > >_________________________________________________________________ >Pozvi své přátele z Facebooku a Hotmailu do Messengeru! >https://www.invite2messenger.net/Default.aspx |
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