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  1. Jim5570091

    Sark 100 antenna analyzer test frequency

    Thanks. I have this manual, maybe my issue with it wasn't fully understood. Look at the picture attached. The sark is showing the test frequency is 40.810 mhz. Connected to a frequency counter it is actually putting out 27.206 mhz. they should match. Right?
  2. Jim5570091

    Sark 100 antenna analyzer test frequency

    Does anyone know how to calibrate the test frequency to match the display frequency on this cheap analyzer?
  3. Jim5570091

    X-force 10 pill 2 pill section unbalanced

    I have a x-force straight 10 pill converted to HG 2879 it seems to have a 2 pill section that falls off after it warms up. Not excessive heat. It looks like it has cheep 104 feed back caps. If one of them falls out of tolerance when warmed up will that cause that section to fall off? If so what...
  4. Jim5570091

    Eightwood RG400

    I’m 100% sure it’s is a knock off. It has really good reviews. Just looking for someone who has used the specific eightwood brand. I have ordered 40 ft of it to make up some jumpers. Have them made and installed. They seem. To have great shielding. Really good heat resistance as well.
  5. Jim5570091

    Eightwood RG400

    Yeah I seen a BBI review on RG400. Not sure the brand he was referring to. I was gonna replace all my jumpers in the shack. His YouTube shows the way he installs the pl259 ends as well. Thanks 73’s
  6. Jim5570091

    Eightwood RG400

    Has anyone used this coax? Is it good quality? https://a.co/d/0bCnVeb1 This is a Amazon link.
  7. Jim5570091

    Smith chart and amplifier input/output tuning.

    On the out put transformers that is.
  8. Jim5570091

    Smith chart and amplifier input/output tuning.

    What value metal clads are standard for HG 2sc2879 16D08. My box had Toshiba in it before and had 1000 pf. Should they be a different value? Like 1200pf.
  9. Jim5570091

    Smith chart and amplifier input/output tuning.

    Those are better than gold nuggets.
  10. Jim5570091

    Smith chart and amplifier input/output tuning.

    Copy that. I’d just trying to work out a way to know if all that combination is correct by testing.
  11. Jim5570091

    Smith chart and amplifier input/output tuning.

    I managed to get this job completed. Photos is completed results. Turns out I was chasing a bad coax and meter. Go figure. Probably what popped the pills originally. But my goal is to understand how to do input/output tuning. On amplifiers of this design.
  12. Jim5570091

    Smith chart and amplifier input/output tuning.

    It’s a XForce straight 10 pill. That burned completely up. I replaced all the pills from Toshiba 2879 red dot with hg 2879 16DO8 matched. Tested all the caps replaced one bad one on an output transformer. New mini coax, new 5 Port combiners/splitters. All new resistors throughout. All matched. I...
  13. Jim5570091

    Smith chart and amplifier input/output tuning.

    Anyone have a good reliable smith chart program download link? And some expertise on input output tuning amplifier. Can you use an antenna tuner on the amplifier input to verify 50ml input? Amp on and manually key the amp?
  14. Jim5570091

    6JB6 tube amp driving 10 pill hg 2879 bouncing swr

    Wouldn’t the SWR swinging still be happening while running the tube type by itself?
  15. Jim5570091

    6JB6 tube amp driving 10 pill hg 2879 bouncing swr

    Don’t have a dummy load that will handle 1.5 KW. To find out. But just changing it from a tube type driver to a solid state stopped the bouncing fluctuation. My problem is solved but just trying to understand why a tube amp driving a solid state would cause that issue.
  16. Jim5570091

    6JB6 tube amp driving 10 pill hg 2879 bouncing swr

    It’s a straight 10.
  17. Jim5570091

    6JB6 tube amp driving 10 pill hg 2879 bouncing swr

    Strange swr behavior resolved. Galaxy 2547 dead key .75 watts 4 tube 6jb6 driving x-force 10 pill. Anytime I turned the dead key up past a 200 watt my swr would go from 1.2 steady to bouncing erratically all the way to 3. Some research pointed me toward a bad connection on my coax or arching...
  18. Jim5570091

    11 meter ground plane home brewing

    And should it be isolated from the mast?
  19. Jim5570091

    11 meter ground plane home brewing

    Considering building a 5/8 wave ground plane for my base. If using a gamma match to feed a ground plane antenna would the radials and verticals be electrically common?