• Balun - BN-43-202 4T:8TCT #26
• Balun balanced side OSL Calibration
  L = 195.2Ω two series PR02FS0201000KR500 100Ω
• Cable purchased Nov 16, 2020
• DXE-LL300 Reference
• No markings on cable
• DXE rebranding of Seminole 1321
• Test length = 33'
• #18/19 #30 measured DCR (2 way) = 1.42Ω (0.0215Ω/ft)
  21% CCS Spec #30 = 491.4Ω/kft. 491.4/1k/19 = 0.0259Ω/ft
• Files dxe300-33-Short.s1p dxe300-33-Open.s1p
• SimSmith traces
  • ARL Blue - Zsc/Zoc Average Return Loss at Zo=250Ω
  • ML Violet - Zsc/Zoc Matched Loss
  • Zo Red - Zsc/Zoc Impedance Ω

• Balun - BN-43-202 4T:8TCT #26
• Vintage JSC 1321
• No markings on cable
• Test length = 47' 8.5"
• #18/19 #30 measured DCR (2 way) = 1.59Ω (0.0167Ω/ft)
  30% CCS Spec #30 = 344.0Ω/kft. 344.0/1k/19 = 0.0181Ω/ft
• Files 1321-Short.s1p 1321-Open.s1p
• SimSmith traces
  • ARL Blue - Zsc/Zoc Average Return Loss at Zo=251Ω
  • ML Violet - Zsc/Zoc Matched Loss
  • Zo Red - Zsc/Zoc Impedance Ω

• Balun - BN-43-202 4T:8TCT #26
• JSC 1320
• No markings on cable
• Test length = 65' 4.5"
• #20/7 measured DCR (2 way) = 1.32Ω (0.0101Ω/ft)
• SimSmith Johnson Model k0 Using #20 Specification 10.15Ω/kf
  k0 == 20 * Log((281 + 2.03/2)/281) = 0.0313
• Files 1320-Short.s1p 1320-Open.s1p
• SimSmith traces
  • ARL Blue - Zsc/Zoc Average Return Loss at Zo=281Ω
  • ML Violet - Zsc/Zoc Matched Loss
  • Zo Red - Zsc/Zoc Impedance Ω

• R1 = 200ft #20 DCR = 2.03Ω
• #20 100% skin depth = 27kHz

• Adjust T2.in_spacing for T2.effZ ~= 281
• Tune T1.k0 for T1 T2 loss trace match at 10kHz

//Plots
$Zo=Fo[];
$Zs=Fs[];
$SRL=IndB(Mag(Gamma($Zs)));
$ORL=IndB(Mag(Gamma($Zo)));
$ARL=-($SRL+$ORL)/4*100/len;
Plot("ARL",$ARL);
$t = Sqrt($Zo/$Zs);
$loss = 0.5 * IndB(Mag((1+$t)/(1-$t))) * 100/len;
Plot("ML",$loss);
$zo = Sqrt($Zo * $Zs);
Plot("Zo",$zo.M,"Ohm",y2);
Plot(k1*Sqrt(G.MHz));

// Vf, Chipman Equation 7.29
$Quarter = 245.8935 / G.MHz;
$t = Sqrt($Zs/$Zo);
$aa=((1+$t)/(1-$t));
$ang=$aa.A;
for($n=0;$n<20;$n++) {
    $TL = 90/(($ang + (360 * $n)) / (2 * len));
    Vf = $TL/$Quarter;
    if((Vf > MinVf) && (Vf < MaxVf)) {
        Plot(Vf,"Vf",y2);
        break;
    }
}