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Re: [A-DX] ca.5071khz Zeitzeichen???
- Subject: Re: [A-DX] ca.5071khz Zeitzeichen???
- From: "Thomas M. Rösner" <dl8aam@xxxxxx>
- Date: Tue, 07 Jul 2009 15:53:12 +0200
> Hallo Ralf! Auf 5071kc muß ein Bakensender sein.Diesen höre ich schon > viele Jahre.Vor allen wenn ich auf 5070kc WWCR hören > will,stört er.Auf meiner Spezialfr.Liste steht(NATO Luftverdeidigung). Hi, keine Zeitzeichen, das sind nur Bursts eines NATO-Datenübertragungssystems (der Luftwaffe/Luftverteidigung) genannt TADIL oder "Link-11". Die 5071 kHz stammt aus Italien. Aus der UDXF Yahoogroups-Liste: >>> That is a NATO Link-11 air defence data transmission, usually transmitted in the USB but can have components in both sidebands (ISB). >>From Wikipedia: « TADIL-A/Link 11 is a secure half-duplex TADIL radio link used by NATO that receives or transmits--but not both simultaneously--a sequential data exchange digital link. It exchanges digital information among airborne, land-based, and ship-board tactical data systems. It is the primary means to exchange data such as radar tracking information beyond line of sight. TADIL-A can be used on either high frequency (HF) or ultrahigh frequency (UHF). However, the U.S. Army uses only HF. Link 11 will be replaced by Link 22. » TADIL = TActical Digital Information Link. --- und eine zweite Mail --- >... but this signal is a link 11A (or tadil A) signal (in most >cases they leave the "A"). i meant link 11B (or tadil B). that have to >be different... i guess. if i am wrong... sorry for that ;) It is difficult to find two specifications which agree about what constitutes A and which constitutes B. It seems TADIL-A is/may be/is possibly a parallel system running at 1364 or 2250 bps. It is possible that TADIL-B runs at either 1200 or 2400 bps and may be a serial system originally designed for UHF but probably running at the higher speeds on HF. Some authorities say it is a parallel system. If you log it, then simply call it TADIL without the A or B as it's not possible to say which is which. Sometimes they make use of both sidebands: whether these are in parallel (carrying the same informatio) or whether they are true independent sidebands can be no more than a guess. Link 11 has a so-called 'doppler' pilot at f+605 Hz, then 14 channels 110 Hz apart between f+935 and f+2365. There is a further pair of tones, narrowly spaced at f+2915 Hz. With a good clear signal, this structure is easily seen on a spectrum analyser. The "plink, plink" tapping sound is the doppler pilot which you should tune to put it on f+605 Hz in a spectrum analyser, then switch sidebands and if the pilot is still there then you have what you can call a TADIL in ISB. If you can't measure the speed then call it 2250; no-one will be any the wiser. They're tactical data links, usually naval air defence, often using TDM to address several net users individually on the one TADIL transmission, but they can also be simplex or half-duplex apparently. Hope this helps, but as you can probably imagine, I don't really know very much about it. Perhaps someone else has some definitive information? To confuse matters further there is a system called SLEW sometimes called Serial Link Eleven Waveform and sometimes Single-tone Link Eleven Waveform. It's not very common, but fairly easily recognisable - but that's another story. -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 -- ----------------------------------------------------------------------- Diese Mail wurde ueber die A-DX Mailing-Liste gesendet. Admin: Christoph Ratzer, OE2CRM http://www.ratzer.at ----------------------------------------------------------------------- Private Verwendung der A-DX Meldungen fuer Hobbyzwecke ist gestattet, jede kommerzielle Verwendung bedarf der Zustimmung des A-DX Listenbetreibers.
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[A-DX] Betr.: Aw: [A-DX] ca.5071khz Zeitzeichen???
- From: ralf@ladusch.de
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[A-DX] Betr.: Aw: [A-DX] ca.5071khz Zeitzeichen???
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