I just received my license and purchased a Kelemen trapped dipole 5 band. I installed in my attic and was told to get it level. In my effort to do that I stretched the 2 large coils between balun and 1st trap- shrinking 2 of the loops on each side. I worked on both to get the large circles back but apparently either wrong size or wrong position or both. Looking for someone with this 5 band antenna that may be able to give me some measurements 1. balun to zip tie, 2. diameter of the large loops, 3. zip tie to the 1st trap. that I may be able to get the antenna back. all bands out of spec according to Nano VNA analyzer.
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Kelemen trapped dipole 10 15 20 30 40
- Thread starter KE9DWN
- Start date
Welcome to amateur radio!
Are there any metallic objects in your attic space? Wiring? HVAC ducting? Plumbing stacks? Metal coated insulation board? What type of roofing material? Any or all of those items can cause coupling and/or distortion of the radiation pattern thus not so great results on your NanoVNA. That will also mean not so great performance on the air. If at all possible get the antenna outside after solving your trap and loop issues.
7 3
That antenna will be long if your tuning the "PHONE" bands...Give us some specs.
You may have to contact the original Mfg. to get those original coil size....Don't fret getting antenna "FLAT" , the Inverted V fine...antenna will still have to be tuned. Evan's comments above are correct, on all items he listed these will change the tuning...
Many here to help
All the Best
Gary/W9FNB
WELCOME ED...Congratulations on your new ticket!!!
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