Yaesu FT-911 (FT 911 FT911) user and service manual, modifications

   
 
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23 April 2019, 3:56 UTC 


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Yaesu FT-911 (FT 911 FT911)
FT-911
Programming interface schematics for Yaesu FT-911 (FT 911 FT911) : programming interface, Yaesu 4 pin plug
Programming software (MARS/CAP/extend TX modification) for Yaesu FT-911 (FT 911 FT911) : 
PDF User Manual for Yaesu FT-911 (FT 911 FT911) : 

Mods for Yaesu FT-911 (FT 911 FT911) :
   Yaesu FT 911 (FT-911 FT911) + 9k6, so gehts!

Yaesu FT-911 (FT 911 FT911) technical specifications :  Yaesu FT-911 (FT 911 FT911) technical specifications



Yaesu FT 911 (FT-911 FT911) + 9k6, so gehts!

Hallo OM's!

Nachdem viele Anfragen auf den Umbau des Handies Yaesu FT-911 fur 9600 Baud Packet Radio in die Boxen eingegangen sind, und ich selbst ein solches Handy besitze, hab ich mich an die Arbeit gemacht und den Umbau mit Hilfe des Schaltplans versucht.

Ich beschränke mich hierbei auf die wichtigsten Angaben, und setze ein gewisses technisches Verständnis voraus:

  1. Das Handy wird geöffnet.
    • Kontaktblech fur Akku abschrauben
    • Bedienknöpfe abziehen
    • obere Abdeckung abschrauben
    • hinten am Handy 2 Schrauben lösen und es kann auseinandergeklappt werden
  2. Der Sende-Anschluß (TX)
    • der Anschlußpunkt befindet sich auf der CNTL UNIT (obere Gehäusehälfte, mit Display, Tastatur)
    • Flachbandkabel, welches die beiden Hälften verbindet, verfolgen
    • flexibles Kabel an Pin 6 von unten (MOD) des Flachbandkabels auf der CNTL UNIT anlöten
    • ggf. Leiterbahn weiterverfolgen und am Widerstand R244 od. R245, 10K anlöten, da Flachbandkabel schlecht zugänglich (vorsicht: Widerstand ist nicht gekennzeichnet)
  3. Der Empfangs-Anschluß (RX)
    • Schrauben der Kupferabdeckung auf der MOTHER UNIT (untere Gehäusehälfte) lösen
    • Kupferabdeckung vorsichtig an allen Lötstellen ablöten
    • die IF UNIT kommt zum Vorschein, 2. Steckplatine von rechts
    • auf dieser befindet sich ein IC, Q501 mit der Bezeichnung TK10487M
    • an Pin 11 dieses IC's wieder ein flexibles Kabel anlöten (1. Pin oben links von rechts gesehen)
    • Kabel geeignet herausfuhren
    • Kupferabdeckung wieder anschrauben und anlöten (keine Lötstelle vergessen!)
        * Wer sich den Aufwand sparen will, kann auch Pin 3 des
          CTCSS-Steckers verwenden, allerdings ist der Pegel dort
          sehr gering, es gibt kein zufriedenstellendes Empfangs-
          ergebnis!
    
  4. Gerät wieder in ungekehrter Reihenfolge wie bei 1. schließen
So, das war schon das wichtigste.
Fur das Herausfuhren der Kabel fur die Verbindung mit dem Modem ist jedem freien Lauf gegeben. Naturlich muß auch die PTT-Leitung uber die Mic-Buchse mit dem Modem verbunden werden.

Ich ubernehme keinerlei Haftung fur eventuell entstandene Schäden, sowie fur die einwandfreie Funktion der Anleitung. Es funktioniert allerdings bei meinem Gerät einwandfrei.
Wer technisch nicht so begabt ist, soll lieber einen anderen OM zur Hilfe nehmen, der sich vielleicht besser auskennt.

Noch ein kleiner Tip furs DF9IC-Modem:
- der Widerstand R19, 27K sollte uberbruckt werden, da das Modem sonst recht taub ist

Fur Anregungen, Verbesserungsvorschläge und weitere Fragen bin ich jederzeit offen.


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