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FELD HELL De 82 de ANI In slujba comunicatiilor DIGITALE

FELD HELL De 82 de ANI In slujba comunicatiilor DIGITALE 12.11.2011 YO9ADN - Dan ANGHEL. Terminal FELD HELL “T typ 58” (1935-1945). Ce este de fapt FELD HELL?. Numele provine din limba germana : FERNFELDSCHREIBER In traducere libera :

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FELD HELL De 82 de ANI In slujba comunicatiilor DIGITALE

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  1. FELD HELL De 82 de ANI In slujbacomunicatiilor DIGITALE 12.11.2011 YO9ADN - Dan ANGHEL

  2. Terminal FELD HELL “T typ 58” (1935-1945)

  3. Ce este de fapt FELD HELL? • Numeleprovine din limbagermana: FERNFELDSCHREIBER • In traducerelibera: TELE IMPRIMATORPORTABIL • NumitFELD – HELL in cinsteainventatorului

  4. Dr. Rudolf HELL (1901 – 2002) • Pionier al capturiidigitalepentrutextesiimagini (alb negru & color) • Pionier al metodelor de procesare, transmitere, afisaresitiparire in format digital • In 1929 inventeazametoda de digitizare la nivel de caracter – primul fax al ereimoderne

  5. Cum functioneaza FELD - HELL • Emisie: Fiecarecaracterestedescompus sub forma uneimatrici de pixelisitransmis in forma seriala. • Receptie: Fiecare pixel estetiparitinstantaneu in momentulreceptiei. • Adica: FAX de rezolutiejoasa la nivel de caracter

  6. Digitizarea unui caracter

  7. Imprimarea unui caracter

  8. Avantajele FELD HELL • Caractereletransmise nu suntcodificate la emisie • Zgomotulinterferentelesau fading-ul pot cauzadistorsionareacarcteruluireceptionat • Nu se pierdcompletcaracterelesinici nu se pot receptionaaltecaracteredecatceletransmise • Emisiasireceptia nu necesitasincronizare • Constructiesimplificata a emitator / receptorului • Nu se initiazadecodificari false • Caracterele se tiparescinstantaneu la receptie • Se poatereglalantul de receptie in timp real pentruceamaibunacalitate a imprimarii • Latime de bandafoarteingusta • Functioneazachiarsiatuncicand un canal de voce devine ne-inteligibil • Se pot folositransceivere simple CW • In concluzie: Un mod de lucruextrem de ADECVATpentruRADIOAMATORI !!

  9. PSK-31 RTTY 31.5 Bd 50 WPM 45.45 Bd 60 WPM 62.5 Hz 270 Hz 80-100% 100% NU NU NU NU NU NU DA NU Comparatie cu modurile digitale uzuale Feld-Hell 122.5 Bd 35 WPM Viteza Banda 367.5 Hz 6-39% Factor umplere Corectie eroriRedundanta NU MARE Transceiver CW? (On-Off-Keying) DA Este necesara stabilitatea frecventei ? NU

  10. PTT-in Spkr-out Mic-in COM-port-out Mic-in Spkr-out Ce avem nevoie pentru a lucra in modul FELD - HELL ? • Un computer cu placa de sunet • Eventual un port serial fizic sau simulat via USB • Un transceiver industrial sau HM chiar in varianta numai CW • O interfata simpla HM • Un software adecvat multimode de exemplu suita HRD - DM

  11. Detalii despre interfata folosita

  12. 2009 O interfata simpla HM

  13. Unde sa ascultam ? • Frecvente de apelHF : • 160 m: 1804 kHz • 80 m : 3574-3584 kHz (Region 1) • 40 m: 7030-7040 kHz, 7077-7084 kHz • 30 m: 10135 - 10145 kHz; 10144 (Region 1) • 20 m: 14063 - 14080 kHz; calling frequencies 14063 & 14074 kHz • 17 m: 18101 - 18107 kHz; calling frequency 18104 kHz • 15 m: 21063 - 21070 kHz; calling frequency 21074 kHz • 12 m: calling frequency 24924 kHz • 10 m: 28063 - 28070 and 28100 - 28110 kHz; calling frequency 28074 kHz.

  14. Multumiri N4SPP Frank Dörenberg www.hellschreiber.com

  15. Multumimpentruatentie ! Varugamsamaiavetirabdare 5 minute pentrudemonstratia LIVE !

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