1. In celebration of the launch of the new redesigned site, we just gave away a FREE antenna! Click Here to See Who Won!

VX-8GR out of band mod and mystery switch.

Discussion in 'Yaesu' started by Brlux, Dec 17, 2010.

  1. Brlux

    Brlux Member

    Joined:
    Jan 20, 2010
    Messages:
    40
    Likes Received:
    0
    I just got a VX-8GR and thought I would post a picture of what you will find when you pull the sticker off the hole in the battery bay.

    [​IMG]

    The little black zero ohm resistor on the right is to be removed to perform the out of band mod. Once you remove it your radio will reset the next time you power it up so back up your memory.

    I use the FTBVX8G software. Pre mod mine showed up as a USA2 after the mod it showed up as a USA3.



    As can be seen on the left there is a small switch which I am calling the "mystery switch". I played with it before and after doing the out of band mod and noticed no difference. It came switched to the right. When I switch it to the left the radio does nothing. It will not power up or recognize that the power cord is plugged in. With the battery removed if I switch it to the right, plug in the power supply, power on the radio and then switch it the radio will be on but frozen. No buttons will respond and it will not tx/rx. Sometimes it would reset it's self after a few seconds to minutes and be operational with the switch to the left, I did not notice any change in operation other than when the power cord is removed and then reinserted or the battery is installed it will no longer power up or do anything. If I remove all power switch it back to the right (default setting) and re apply power then it seems to be back to normal.

    Any ideas what it may be used for? My thoughts are perhaps putting it into mode for firmware upgrade over the serial port?
    #1
  2. richardyoo

    richardyoo Member

    Joined:
    Aug 18, 2009
    Messages:
    17
    Likes Received:
    0
    On the 350r there's a switch inside and behaves as you described and its used for firmware updates.
    #2
  3. Brlux

    Brlux Member

    Joined:
    Jan 20, 2010
    Messages:
    40
    Likes Received:
    0
    O good that is what I was hoping to hear. There is a lot to like about this radio and also a lot to hate which could almost all be fixed in firmware. I have a dream that one day they release a very useful user installed update.

    I am going to start compiling my wish list, now how to bend the ear of someone at Yaesu who can actually make things like this happen?
    #3
  4. Brlux

    Brlux Member

    Joined:
    Jan 20, 2010
    Messages:
    40
    Likes Received:
    0
    My radio did come with a spare back cover sticker in the box. I mangled mine fairly bad when I pulled it off, It would not have been water resistant if I had tried to put the old one back on. This tells me that they did plan on users having to remove and replace this sticker. Perhaps this is a good sign for firmware updates.
    #4
  5. jeepjw

    jeepjw Member

    Joined:
    Jun 9, 2011
    Messages:
    1
    Likes Received:
    0
    With this mod can radio do 220
    #5
  6. Once Bitten

    Once Bitten Member

    Joined:
    Aug 13, 2011
    Messages:
    74
    Likes Received:
    10
    Anyone?
    What can I gain?
    #6
  7. hedehede81

    hedehede81 Member

    Joined:
    Nov 5, 2011
    Messages:
    3
    Likes Received:
    0
    is it possible to RX below 108 mhz? I have VX-8GR, I'm wondering if there's a mod to do that if it's not blocked in hardware. thanks.
    #7
  8. PJ2SM

    PJ2SM Member

    Joined:
    Oct 23, 2010
    Messages:
    2
    Likes Received:
    0
    need some info

    hello, did this mod tx in 220 Mhz? VX-8GR ??
    #8
  9. PD0T

    PD0T Member

    Joined:
    Dec 29, 2011
    Messages:
    3
    Likes Received:
    0
    Hi all!

    Since 2 days I'm a proud owner of the VX-8G handheld and I really like it so far. I saw this topic and decided to register on this forum because I think Yaesu should really provide a firmware update (Dear Yaesu: I'd even PAY for it!!!!).

    This would be my wishlist to make it the ultimate portable for me:

    1. Change the STATION LIST view to show the distance to APRS stations instead of the time/date in the last column or at least make that configurable.

    2. Shortcuts to disable/enable GPS and the APRS modem

    3. Possibility to create APRS objects (or is that already possible?)
    ---

    Regarding the "mystery switch":
    Has someone already tried to see if something happens on the serial (DATA) port of the VX-8G if you set the switch to the left? Maybe, it'd be possible to analyze what the firmware upgrade tool for the FTM-350 is doing on the serial link to initiate the upgrade? It'd be awesome to be able to get a dump of the VX-8G firmware...
    #9
  10. PD0T

    PD0T Member

    Joined:
    Dec 29, 2011
    Messages:
    3
    Likes Received:
    0
    Hello again :)

    I just checked the circuit diagram and found the switch! It's called S1005 and you can find it on the RF Unit diagram (page 19, at the bottom, on the left of the connector).

    There's a small table above it:
    Code:
    ------------------------
    |      | BOOT  | WRITE |
    |MD2   |----------------   
    |      | Vcc    | GND  |
    ------------------------
    
    So by default it's on "BOOT". I hope so much that we can use this to upgrade the VX-8G one day! I'm very sure that by releasing firmware upgrades Yaesu could boost their VX-8G sales big time :)

    Cheers & 73,

    Thomas PD0T
    #10
  11. PD0T

    PD0T Member

    Joined:
    Dec 29, 2011
    Messages:
    3
    Likes Received:
    0
    No, this mod won't enable the 4m band as it's simply not supported by the hardware!
    #11
  12. Lion

    Lion Member

    Joined:
    Jan 20, 2013
    Messages:
    1
    Likes Received:
    0
    I have the Japanese version of this radio (the "VX-8G") and although it has not been modded and the TX is still restricted, there is no resistor on the pads under the sticker - the pads are not connected at all.

    Does anyone know how the Japanese model differs and whether it is possible to mod it?
    #12


Share This Page