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FT857D - All Band Modification

IMPORTANT - I carried this out many years ago and it was successful.  Others have contacted me from around the world, in the intervening years, and not all have been successful.  I would therefore caution against carrying it out, maybe the firmware of the radio has changed over time, or in that it only applies to certain markets.  I would remove the page, but it did work for me and someone else may have a simialr age 857D and/or be interested in the details of the mod'..

I successfully modified my UK FT857D to allow me to transmit on 5Mhz in accordance with my Notice of Variation (NOV).

The hardware modification details were obtained form the internet and are recorded here. NOte however that someone recently applying this had problems (2016).  As such, I wonder if Yaesu have changed the radio since the time I carried out this modification.  As such,  please proceed only if you are brave (and no, I dont offer any warranty) ... .. .

If you have memories set in the radio, then the first step would be to record these if you wanted to re-input them after the modification. I use FTBasicMMO and used this to read the radio settings (but see note 2 below)

Next we power off and disconnect all connectors.

Remove the top cover.  This involves removal of the seven screws hightlighted below

Lift the ccover off carefully and disconnect the speaker lead (circled in yellow)

Locate the jumpers that are to be modified

On my UK (C2) version the jumpers are originally set as below
you can see the surface mounted jumpers (zero ohm resistors) and also the numerical identification. Note the non-consecutive numbering - make sure you positively identify the required jumpers before proceeding.

Remove the un-required jumpers by using a fine tipped soldering iron and fine tweezers (and a magnifying glass!). Next in theory you could use these removed jumpers and solder them in the locations that need them adding.  However, because this is really fiddly (for me), and because the jumpers are zero ohm resistors, I elected to just solder bridge the lands for the newly required jumpers. Here's the result

Next, reassemble everything.  On powering on you'll need to do a reset. When I used the master reset as detailed in he manual (<home> and <power>) I found that I could still not transmit on 5Mhz. A more careful read of the instructions I was following indicated that a reset involving <Func> and <V/M> and <Power> together was required.  I carried this out and was now able to TX on 5Mhz.

Next I wanted to reload the programming into the radio. As I use FTBasicMMO I elected to use that only to find it failed on writing back to the rig. This turned out to be because the Rig ID had changed as part of the modification.  FTBasicMMO now reported the ID as 50/06 whereas it was 15/06 before.  The solution was to save the original programming as CSV, read the radio to set the ID to 50/06, import the saved CSV data and then finally write it back to the radio - job done.


  1. Following a reset (Home and Power) i found that the 5Mhz band was still unavailable. Reading carefully on the website, it referred to a reset of <func> <V/M> and <Power>. Tying this did the trick and allowed transmission of 5Mhz.
  2. I use FTBasicMMO to read and write memories to my 857.  Following the reset above I found that this program would cause a report of 'Error' on the 857 when trying to send programming to the radio. Whilst investigating this, I noticed that the pre-mod radio had a 'Rig ID' of 15/06 and post mod a 'Rig ID' of 50/06. I am not sure of the significance of these numbers but by reading the rig and then import the old settings from CSV, I was able to send the old memories to the 857 as  a rig with an ID of 50/06.
  3. I found in my attempts to re-instate the programming with FTBasicMMO that in some circumstances the radio went deaf on all bands!  I never did figure out why, but once finally programmed correctly (see above) all was in order.
  4. Information found so far as to jumper settings is:
  5. And the relevant circuit diagram details:
  6. FT857D Reset options from manual
    Some or all transceiver settings can be reset to their factory-default states using one of the
    following power-on routines:
    a)  [V/M] + POWER on: Resets all memories and following menu settings to their factorydefault
    Menu #06 (AM STEP), 33 (DCS CODE), 52 (FM STEP), 56 (MEM TAG), 76 (RPT SHIFT),
    82 (SSB STEP), and 83 (TONE FREQ).
    b)  [FUNC] + POWER on: Resets all menu settings (except the following menu items) to
    their factory-default values.
    Menu #06 (AM STEP), 33 (DCS CODE), 52 (FM STEP), 56 (MEM TAG), 76 (RPT SHIFT),
    82 (SSB STEP), and 83 (TONE FREQ).
    c) [HOME] + POWER on: CPU master reset for all memories and menu settings.

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