Demons DX´ers

Modificacion de potecia de TX en Yaesu FT-857

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Creado en Jueves, 27 Agosto 2009 07:19
Escrito por EA1HFI

Cambiando algunas opciones de este menú, se puede aumentar la potencia máxima en todas las bandas, y el resultado es bastante bueno. En HF y 6M,  casi 150W , en VHF salen casi 100W, y sobre 50 en UHF.

Según algunos colegas que llevan la modificación dicen que el ventilador trabaja un poco mas pero que el equipo no calienta, así que a probar !!!

Aquí dejo la info:

TX Power Mod for Yaesu FT857(D)

WARNING: changing these will reset all the memories.

  1. Enter the Servicemenue. I want to warn you do not change these values unless you are sure of what you are doing. To get them turn transceiver off. Press and hold the A,B,C keys; while holding them in, press and hold in the [PWR] switch for 1/2 second to turn the tranceiver On. Now let go of all keys. Press F key to finish.
  2. For this procedure you will need a Dummy Load (or a well matched Antenna) and a Wattmeter!
  3. Locate Menue No 
    NO-024  HF1-PO-MAX  165 (set to 255) CW     1.800.00

    NO-028  HF2-PO-MAX  159 (set to 255) CW     7.068.19

    NO-032  HF3-PO-MAX  158 (set to 255) CW    21.225.13

    NO-036  50M-PO-MAX  145 (set to 255) CW    50.000.00

    NO-040  VHF-PO-MAX  87 (set to 255)  CW   145.437.50

    NO-043  UHF-PO-MAX  112 (set to 255) CW   438.900.00

That´s it!

After this mod I have about 130 Watts on HF and 6 mtr, about 90 Watts on VHF and 40 Watts on UHF!

I have done this mode a few month ago and I have no problems (my Final Transistor is still ok ;-)) !

IMPORTANT: Before changing any values in the Aligment menue, please write down your original settings!

WARNING: DOING THIS MOD MAY EVENTUALLY RESULT IN A DAMAGED FINAL TRANSISTER AND/OR REDUCED SERVICE LIFE!!

73 de Alex, HB9TSF, NH7VW

 

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