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Tuesday, December 11, 2012

TX Power Mod for Yaesu FT857(D)



WARNING: changing these will reset all the memories.


  1. Enter the Service menu. 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 transceiver 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 Menu No 
    1. NO-024 HF1-PO-MAX 165 (set to 255) CW 1.800.00 
    2.  NO-028 HF2-PO-MAX 159 (set to 255) CW 7.068.19 
    3.  NO-032 HF3-PO-MAX 158 (set to 255) CW 21.225.13 
    4.  NO-036 50M-PO-MAX 145 (set to 255) CW 50.000.00 
    5.  NO-040 VHF-PO-MAX 87 (set to 255) CW 145.437.50 
    6.  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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