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.' or sequences like'RYRYRYRYRYRY.' such signals are useful for testing purposes, ifa little dull to watch scrolling up the VDU screen.You will discover many signals that you can't decode: thecommonest reason is that the transmissions do not use Europeanalphabets, and all the elements in the Baudot code have beenre-assigned--some versions of Baudot use not one shift, but two, togive the required range of characters.Straightforward en- cryptedmessages are usually recognisable as coming in groups of fiveletters, but the encryption can also operate at the bit- as well asat the character-level -- in that case, too, you will getgobbleydegook.A limited amount of ASCII code as opposed to Baudot is to befound, but mostly on the amateur bands.Finally, an error-correction protocol, called SITOR, isincreasingly to be found on the maritime bands, with AMTOR, an amateurvariant, in the amateur bands, SITOR has various modes of operationbut, in its fullest implementation, messages are sent in blocks whichmust be formally acknowledged by the recipient before the next one isdespatched.The transmitter keeps trying until an acknowledgement isreceived.You may even come across, on the amateur bands, packetradio, which has some of the features of packet switching on digitalland lines.This is one of the latest enthusiasms in amateur radiowith at least two different protocols in relatively wide use.Discussion of SITOR and packet radio is beyond the scope of thisbook, but the reader is referred to BARTG (the British Amateur Radiofile:///E|/Books/Hackers Handbook.htm (99 of 133) [11/28/2000 5:58:50 AM] Hacker's HandbookTeletype Group) and its magazine Datacom for further information.Youdo not need to be a licensed radio amateur to join.The address is:27 Cranmer Court, Richmond Road, Kingston KT2 SPY.Operational problems of radio hacking are covered at the end ofAppendix I, the Baudot code is given Appendix IV and an outlinefrequency plan is to be found in Appendix VI.** Page 105The material that follows represents some of the types of commontransmissions: news services, test slips (essentially devices forkeeping a radio channel open), and amateur.The corruption in placesis due either to poor radio propagation conditions or to the presenceof interfering signals.REVUE DE LA PRESSE ITALIENNE DU VENDREDI 28 DECEMBRE 1984LE PROCES AUX ASSASSINS DE L~ POIELUSZKO, LA VISITE DEM.SPADOLINI A ISRAEL, LA SITUATION AU CAMBODGE ET LA GUER-ILLA AU MOZAMBIQUE FONT LES TITES DES PAGES POLITIQUESMOBILISATION TO WORK FOR THE ACCOUNT OF 1985- AT THE ENVER HOXHA AUTOMOBILE ANDTRACTOR COMBINE IN TIRANA 2TIRANA, JANUARY XATA/.- THE WORKING PEOPLE OF THE ENVER HOXH~/AUTOMOBILE AND TRACTOR COMBINE BEGAN THEIR WORR WITH VIGOURAND MOBILISATION FOR THE ACCOUNT OF 1985.THE WORK IN THISIMPROVOWNT CENTER FOR MECHANICAL INDUSTRY WAS NOT INTERRUPTEDFOR ONE MOMENT AND THE WORKING PEOPLE 8~S ONE ANOTHER FORFRESHER GREATER VICTORIES UNDER THE LEADERSHIP OF THE PARTYWITH ENVER HOXHA AT THE HEAD, DURING THE SHIFTS, NEARTHE FURNANCES~ PRESSES ETC.JUST LIKE SCORES OF WORKING COLLE-CTIVES OF THE COUNTRY WHICH WERE NOT AT HOME DURING THE NEWYEAR BIN THE FRONTS OF WORK FOR THE BENEFITS OF THE SOCI-ALIST CONSTRUCTION OF THE COUNTRY.PUTTING INTO LIFE THE TEACHINGS OF THE PARTY AND THE INSTRU-CTIONS OF COMRADE ENVER HOXHA, THE WORKING COLLECTIVE OF THISCOMBINE SCORED FRESH SUCCESSES DURING 1984 TO REALIZE THEINDICES OF THE STATE PLAN BY RASING THE ECEONOMIC EFFECTIVE-NESS.THE WORKING PEOPLE SUCCESSFULLY REALIZED AND OVERFULFILLED THE OBJECTIVE OF THE REVOLUTIONARY DRIVE ON THE HIGHEREFFECTIOVENESS OF PRODUCTION, UNDERTAKEN IN KLAIDQAULSK SO~WITHIN 1984 THE PLANNED PRODUCTIVITY, ACCORDING TO THE INDEXOF THE FIVE YEAR PLAN, WAS OVERFULFILLED BY 2 PER CENT [ Pobierz całość w formacie PDF ]

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