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6600 pops household circuit breaker when keyed in tune mode with over 5 watts

I just received my new 6600. I am using MACOS smartSDR. Receive OK. Whenever I try to key the transmitter with tune button, if power is over 4 - 5 watts the room circuit breaker is tripped. I've tried it on several different circuit breakers with same result. Power supply is new linear 30 amp PS. Any ideas before I call in a help request? Works fine on receive


  • Martin AA6E
    Martin AA6E Member ✭✭✭

    Had similar issues with my 6500. RF coupled into the ac power line triggered my arc interrupter breaker. Depends on power level and frequency.

    Try a good dummy load. Check your antenna SWR. Try an un-un coax isolator etc.

    GL es 73 Martin AA6E

  • John KB4DU
    John KB4DU Member ✭✭✭✭

    Is it a breaker in the main entrance panel, or is it the gfi in the outlet itself?

  • Erika - KØDD
    Erika - KØDD Member ✭✭✭
    edited July 31

    I originally had the same sort of problem using my 6500. I who worked as an electrician in our family business at one point of my life, installed a 200A 40 breaker panel in the house, all new wiring, and a lot of expensive ARC Fault / GFI breakers. Back in my electrician era I installed a lot of panels and new breakers, and in those days GFCI outlets were the thing and there were no ARC fault breakers.

    WELL, when on 40m pop and the whole shack went down.... I had quickly installed the radio (As it was my new toy) and station grounding, lead RFI ferrites and chokes were just not installed as it was day 1 an upgrade from a FLEX 1500.

    I changed out the ARC fault for a standard breaker and it's still in there 7 years later. HOWEVER, the station got a straight shot through the floor to the foundation, through a hole right to an 8 ft x 5/8" copper ground rod. I installed ferrites on about everything that comes out or goes into the radio... And am meticulous with station grounding and RFI protection. This is especially important when you need to interface with remote coax switches driven with USB cables to computers.

    First thing would be get the ARC fault out of the shack, so that you can get on the air. and then make sure whatever RF you do make, gets out of the shack through feedlines correctly and then decouple everything. My favorite ferrite is a DXE slip over the coax and then install connector unit.

    Through this process, I still managed to BREAK, my 8877 amp when the 6500 locked in full transmit, crashed the computer and recently my little dual 3-500 FT8 amp blew up when the station again locked in transmit when the coax switch freaked and locked the computer on. The end result was a complete rebuilding of my station into heavily grounded racks on one side of the room, and the shack computer op desk now 15 feet away from the radio, power supplies, tuners and switches. When you start adding even more power, your RFI procedures become even far more critical !!! You can see what I've done on my ZED Page... and I'm still working on the rebuild. Good luck with everything. Erika DD

  • k3Tim
    k3Tim Member ✭✭✭

    For anyone that has to deal with the AFCI type breakers, this thread may be of interest:


    Page 53 of the forum post is a good place to start reading.

  • David Lejeune
    David Lejeune Member
    Sure enough, it was an EATON circuit breaker of vintage 2003 when the condo I'm in was built. Called an electrician to come in and swap it out with one that doesn't trip. Hopefully I wont have to swap out all of them (at $40 each). Thanks for the help.

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