Yaesu FT-857 (FT 857 FT857) user and service manual, modifications

   
 
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Yaesu FT-857 (FT 857 FT857)
FT-857
Programming interface schematics for Yaesu: programming interface, Yaesu 4 pin plug
Programming software for Yaesu FT-857 (FT 857 FT857) : Yaesu FT-857 soft jump for extended TX
PDF User Manual for Yaesu FT-857 (FT 857 FT857) : Yaesu FT-857 Operating Manual
PDF presentation brochure for Yaesu FT-857 (FT 857 FT857) : Yaesu FT-857 brochure
PDF Service Manual with schematics for Yaesu FT-857 (FT 857 FT857) : Yaesu FT-857 Service Manual, schematics

Mods for Yaesu FT-857 (FT 857 FT857):
   Yaesu FT-857 (FT 857 FT857) low frequency response in SSB
   Yaesu FT-857 (FT 857 FT857) 40m band expansion 7.1 mhz 7.2 mhz transmit
   Yaesu FT-857 (FT 857 FT857) Undocumented Feature
   Yaesu FT-857 (FT 857 FT857) Mic Wiring
   Yaesu FT-857 (FT 857 FT857) Adding drag to FT-857's tuning knob
   Yaesu FT-857 (FT 857 FT857) European FM Settings
   Yaesu FT897/857/817 (FT-897-857-817 FT897/857/817) Jumpers by Software
   Yaesu FT-857 (FT 857 FT857) Second menu
   Yaesu FT-857 (FT 857 FT857) MARS mod
   Yaesu FT-857 (FT 857 FT857) Installing The Options
   Yaesu FT-857 (FT 857 FT857) FM-Squelch Fix

Yaesu FT-857 (FT 857 FT857) technical specifications : Yaesu FT-857 (FT 857 FT857) technical specifications

Yaesu FT-857 (FT 857 FT857) MARS mod

FT-857 (US version)
Modification for TX:
1.8-56MHz, 137-164MHz, 420-470MHz
  1. Remove the seven screws affixing the top panel of the transceiver, and gently lift it upward.

  2. Carefully remove the small 2-pin speaker plug from the left rear corner of the transceiver interior then remove the top case and set it aside for the moment.

  3. Locate the nine jumpers about 2" from the front edge of the main unit and about 3/4" from the left edge. For 144/430MHz expansion only, remove the jumper at JP1002, leaving the other jumpers alone. For complete expansion per the above listing, place jumpers at JP1007/1008/1009, and remove the jumpers at JP1001/1002/1003/1004/1005 (leave the jumper at JP1006 in place). NOTE THE UNUSUAL SEQUENCE FOR THE NUMBERING.

  4. Replace the top panel; don't forget to re-connect the speaker lead removed in step 2.

  5. With the transceiver off, press and hold in the [F] and [V/M] keys; while holding them in, turn the radio on. Modification is now complete.

Hanno Vogels, DG8JZ




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