#18 PTFE Loss Study

#18 PTFE Twisted with length = 23' 1" (repurposed 30M 1/4 wave wires)
5T:5TCT #22 Fair-Rite 2843010402 Transformer Balun, 96.3Ω Cal LOAD
5T:5TCT #24 BN-43-202 Fair-Rite 2843000202 Transformer Balun, 49.3Ω Cal LOAD
"Theory and Problems of Transmission Lines," Robert A. Chipman,
Equations 7.27, 7.28, and 7.29
VNWA: 1-30 MHz Log, 200 points, 20 second sweep
VNWA files: open.s1p short.s1p 43202-open.s1p 43202-short.s1p

Toroid Core Auto-Transformer Ruthroff Balun

FT-50-43 Fair-Rite 5943000301
12T:12T #24
VNWA Calibration and Measurement: 1 - 30 MHz, Log, 21 Points, 2.1 second sweep
VNWA files: ft50-43-short.s1p ft50-43-open.s1p

VNWA Calibration and Measurement: 1 - 100 MHz, Log, 21 Points, 2.1 second sweep
VNWA files: ft50-43-short-1-100.s1p ft50-43-open-1-100.s1p

Two FT-50-43 Fair-Rite 5943000301
12T:12T #24
VNWA Calibration and Measurement: 1 - 100 MHz, Log, 21 Points, 2.1 second sweep
VNWA files: 2xft50-43-short.s1p 2xft50-43-open.s1p

SimSmith Plot of VNWA 43202 Measurement

Vf at 1/4λ = 23.08 / (246.1 / 8.615) = 0.81
Vf at 3/4λ = 23.08 / ((3 * 246.1) / 26.17) = 0.818

#18 DCr = 6.385Ω/1000' = 1.277Ω/200'
k0 = 10 * Log10((114.2 + 1.277) / 114.2) = 0.048

Plots Text for Cut and Paste
//Plots // Chipman Equation 7.28 $t = Sqrt(L.Z/LG1.Z); $loss = 4.34295 * Ln(Mag((1+$t)/(1-$t))) * 100/len; Plot("Loss",$loss); // Average (20 * Log(Reflection Coefficient)) / 2 // Zo dependent $SRL=IndB(Mag(Gamma(L.Z))); $ORL=IndB(Mag(Gamma(LG1.Z))); $ARL=-($SRL+$ORL)/4*100/len; Plot("GLoss",$ARL); Plot("k1k2",k1*Sqrt(G.MHz) + k2*G.MHz);