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en:etk-r_55 [2024/01/14 19:06] – mben:etk-r_55 [2024/01/14 19:06] (aktuell) – mb
Zeile 34: Zeile 34:
 The modem section in the ETK-R was fundamentally revised and optimised with better filtering for radio teletype connections.\\  The modem section in the ETK-R was fundamentally revised and optimised with better filtering for radio teletype connections.\\ 
 Operation modes can be used with single-tone telegraphy 1500 Hz ("Radio ETT" setting) or frequency shift keying with space frequency 1245 Hz, mark frequency 1155 Hz ("Radio normal" mode). In addition to the normal "radio" mode, the "radio fading" mode was introduced; a second detector is used to transmit and analyse not only the fundamental frequencies 1255/1145 Hz, but also the first harmonic 2510/2290 Hz, with the stronger signal being fed to the ETK teleprinter. Operation modes can be used with single-tone telegraphy 1500 Hz ("Radio ETT" setting) or frequency shift keying with space frequency 1245 Hz, mark frequency 1155 Hz ("Radio normal" mode). In addition to the normal "radio" mode, the "radio fading" mode was introduced; a second detector is used to transmit and analyse not only the fundamental frequencies 1255/1145 Hz, but also the first harmonic 2510/2290 Hz, with the stronger signal being fed to the ETK teleprinter.
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 {{:images:gretag-etk-r55-elektronik.jpg?direct&330|ETK R-55: Modem}} {{:images:gretag-etk-r55-elektronik-inside.jpg?direct&330|ETK R-55: Interior view}} {{:images:gretag-etk-r55-elektronik.jpg?direct&330|ETK R-55: Modem}} {{:images:gretag-etk-r55-elektronik-inside.jpg?direct&330|ETK R-55: Interior view}}
  
en/etk-r_55.1705255603.txt.gz · Zuletzt geändert: 2024/01/14 19:06 von mb