Jack, I am sorry to hear that you had problems with the twisted pair wire.
Normally twisted pair makes a very effective and self shielding transmission line, even at 6 meters. The characteristic impedance does depend on the diameter of the conductors and the thickness of the insulation separating the two conductors.
I am glad that you had success with your RG-58 substitution, but I believe there was some other condition present that your substitution corrected.
73, Don W3FPR On 11/17/2015 5:55 PM, wa9fvp wrote:
I remember when I was building the KPA500 that there was a 4" twisted wire from the PA board to the RF out jack. A short twisted wire as a transmission line on the HF bands is probably OK but On 6 meters, the inductance in twisted wire, I'm sure, will exhibit loss. I replace it the wire with a 4" length of RG58U. Now all 3 SWR readings agree and the VSWR is 1.1:1.
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