Unexpected Behavior of Smart SDR SWR / Power Meter into New OCF Dipole

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  • Updated 3 years ago
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Today I installed a Maxcom (fairly generic) OCF dipole for 80-6 meters.  It has the supplier's 4:1 balun.  I have made a choke at the feed point from a 3 inch ferrite doughnut with 12 turns of RG8X coax followed by 5 snap-on split beads of admittedly unknown mix (Amazon).  My MFJ 259C analyzer says 1.2:1 SWR on 40 meters.  The feed point is about 40 feet above the house and not directly over the shack.  My "Flex PC" has a pair of $8.99 amplified speakers that pick up virtually all stray RF.  They are quiet.

Given the above, my back-up rig, an IC 7300 operates normally into the antenna.  At least on 40, my Flex 6300 running SSDR 1.18.4 shows off the scale SWR and little power output.

Any ideas?
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Bill Roberts

  • 225 Posts
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Posted 3 years ago

  • 1
Photo of Bill Roberts

Bill Roberts

  • 225 Posts
  • 46 Reply Likes
Official Response
Might as well close this one. It appears my problem was stray RF that didn't bother the back-up radio. Problem resolved with an old Radio Works line isolator.