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Une balise à lettre unique est une station … Une balise à lettre unique est une station radio qui émet en boucle une même lettre en morse (A1A). En anglais, on parle de letter beacon, single letter beacon, single letter high frequency beacon, ou single letter high frequency marker. L'existence de ces balises n'est reconnue par aucun État, même s'il paraît clair qu'elles sont toutes situées en ex-URSS ou dans des pays alliés. Elles ne sont pas déclarées auprès de l'UIT, dont elles ne respectent pas les plans de bandes. Leur fonction demeure incertaine. Leur existence a été découverte à la fin des années 1960. Elles sont bien connues des radioamateurs depuis 1978, lorsque la balise « W » a commencé à émettre sur 3,584 MHz dans la bande des 80 mètres. Il existe des preuves indirectes qui montrent que cet émetteur était situé à Cuba.trent que cet émetteur était situé à Cuba.
, Letter beacons are radio transmissions of … Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter. They have been classified into a number of groups according to transmission code and frequency, and it is supposed that the source for most of them is Russia and began during the Soviet Union. (Some beacons sending Morse code letters are well known directional or non-directional beacons for radio navigation. These are not discussed in this article.) Letter beacons have been referred to as:
* SLB, or "Single Letter Beacons"
* SLHFB, or "Single Letter High Frequency Beacons"
* SLHFM, or "Single Letter High Frequency Markers"
* Cluster beacons
* MX — an ENIGMA and ENIGMA-2000 designation.X — an ENIGMA and ENIGMA-2000 designation.
, I letter beacon sono segnali (simili a que … I letter beacon sono segnali (simili a quelli prodotti da un radiofaro) di origine incerta e con scopi sconosciuti, consistenti in una trasmissione radio di una singola lettera ripetuta in codice Morse. Vengono anche chiamati, sulla base di lievi differenze:
* SLB: Single Letter Beacons (segnali a lettera singola);
* SLHFB: Single Letter High Frequency Beacons (segnali a lettera singola in HF)
* SLHFM: Single Letter High Frequency Markers (marcatori a lettera singola in HF)
* marcatori di canale
* marcatori cluster
* marcatori FSK
* MX, una designazione ENIGMA La designazione ENIGMA è la più opportuna e classifica questi segnali in tre categorie:
* MXb: segnali di a lettera singola
* MXm: marcatori di canale a lettera singola
* MXr: altri marcatori correlati Si suppone che molti dei letter beacon abbiano origine da postazioni militari usate dalla Russia o dalla marina statunitense. Altri segnali, i cosiddetti phantom fishnet beacon, (radiofari posti solitamente su una boa atti a segnalare la presenza di una rete da pesca, in questo caso di origine sconosciuta) si suppone si trovino nel sud dell'oceano Atlantico. Vi è stato un caso in cui l'origine di una trasmissione di questo tipo è stata ricondotta ad un trasmettitore legato a due palme in una spiaggia isolata della Florida. Scoperte alla fine degli anni sessanta, lo scopo di queste trasmissioni è sconosciuto. Si è ipotizzato che siano marcatori di canale, che siano usate nel tracciamento dei satelliti o, ancora, per scopi di protezione civile. Alcune stazioni come il marcatore U (identificato dalla lettera trasmessa) sono state usate per operazioni di . Le frequenze utilizzate vengono spesso cambiate e, occasionalmente, vengono trasmesse voci o segnali di tipo (a volte identificabili come o informazioni cifrate). Gli elevati costi per mantenere stazioni simili rendono assai improbabili le bufale.imili rendono assai improbabili le bufale.
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Une balise à lettre unique est une station … Une balise à lettre unique est une station radio qui émet en boucle une même lettre en morse (A1A). En anglais, on parle de letter beacon, single letter beacon, single letter high frequency beacon, ou single letter high frequency marker. L'existence de ces balises n'est reconnue par aucun État, même s'il paraît clair qu'elles sont toutes situées en ex-URSS ou dans des pays alliés. Elles ne sont pas déclarées auprès de l'UIT, dont elles ne respectent pas les plans de bandes. Leur fonction demeure incertaine. bandes. Leur fonction demeure incertaine.
, I letter beacon sono segnali (simili a que … I letter beacon sono segnali (simili a quelli prodotti da un radiofaro) di origine incerta e con scopi sconosciuti, consistenti in una trasmissione radio di una singola lettera ripetuta in codice Morse. Vengono anche chiamati, sulla base di lievi differenze:
* SLB: Single Letter Beacons (segnali a lettera singola);
* SLHFB: Single Letter High Frequency Beacons (segnali a lettera singola in HF)
* SLHFM: Single Letter High Frequency Markers (marcatori a lettera singola in HF)
* marcatori di canale
* marcatori cluster
* marcatori FSK
* MX, una designazione ENIGMArcatori FSK
* MX, una designazione ENIGMA
, Letter beacons are radio transmissions of … Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter. They have been classified into a number of groups according to transmission code and frequency, and it is supposed that the source for most of them is Russia and began during the Soviet Union. (Some beacons sending Morse code letters are well known directional or non-directional beacons for radio navigation. These are not discussed in this article.) Letter beacons have been referred to as:) Letter beacons have been referred to as:
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Balise à lettre unique
, Letter beacon
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