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![]() "Cecil Moore" wrote in message ... snip The velocity factor of the twinlead might be as much as 20% different from the copper tubes. If you use the same dimensions, the resonant frequency will be too low. Did you compensate for velocity factor? Did you check the resonant frequency with something like an MFJ-259B? snip Seems you need to make the adjustments using a throw-away version of the antenna. Once you determine the proper dimensions, you can build the final version. I would start by shaving the insulation off both stub wires so they can be soldered to the coax and chopping off 10% of the length of the 1/2WL section. Yes! All of the above! Also, it has been my experience that the recommended quarter-inch gap cut in one of the twinlead conductors [to create the stub section] is insufficient. I make it at least a half-inch. |
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