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flex 6700 crashing if i use more than 25watts output...

G4YDO Member ✭✭
edited September 2019 in SmartSDR for Windows
I normaly have an expert 1k linear in my setup, but i have had a problem with the expert, so its away at the repair shop, the flex is now connected direct to my steppir antenna, but when in increase my power to more than 25watts the radio locks up with this fault code  "p8l13v8b-09.48
check fuse "
when the expert1k is connected, i can tx over 500w with a problem...
can anyone help..


  • Jim K4JAF
    Jim K4JAF Member ✭✭
    edited January 2018

    You may have a large voltage drop from the power supply, check your voltage right at the 6700 at various power levels.. PS could be problem but more likely the 12 volt supply cable connectors.

    73s Jim K4JAF

  • K2CM
    K2CM Member ✭✭
    edited September 2019
    If You put more than 25 watts into your amp, then the voltage should be ok. RF feedback might be causing the problem. Try putting ferrite cores on all cables. RF can get into everything....and sometimes a minor change causes RF to get into places that you would least expect.
  • GI4FZD
    GI4FZD Member
    edited April 2017
    I would suggest test it into a dummy load and see if you get the same results, just to eliminate the
    possibilities of rfi,
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited March 2017
    These are all good suggestions.  I would do the transmit into a dummy load first to rule out an RFI issue.  This could be a bad coax jumper or common mode currents on the coax form an unbalanced antenna.
  • Roland
    Roland Member
    edited November 2016
    I had the same problem with a 6300, the fan in the transceiver quit working!

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