SA-2060A Balun Model

  • Heathkit SA-2060A 4:1 Balun
  • Estimate core as two T200-2 Powdered Iron with 14 Turns
    T200-2 AL = 120uH/100T (Reference)
    Two T200-2 AL = 120uH * 2 = 240uH
    uH = 240 * (14/100)2 = 4.7uH
  • C1.Wr1M = Estimated wire loss at 1MHz
    14T #16, 2.23Ω/100' at 1MHz (Reference)
    Length=45" (estimated)
    2.23 / 100 / 12 * 45 = 0.0836Ω (Round up to 0.1Ω)
  • Estimated core loss, Rp = 80kΩ, using T94-2 measurement below
  • Balun measurement, Balun.s1p, from ZL4AI using AA-54, photo below
  • Square chart L dBW = Balun Matched Loss
  • Files: ZL4AI.zip


SimSmith SA-2060A 4:1 Balun Model and Measurement
ss-Balun-Auto.ssx



SimSmith Balun Model RUSE


Photo by ZL4AI




Evaluate -2 Powdered Iron Loss





Wire Resistance
  • 24T #22, 4.73Ω/100' at 1MHz (Reference)
  • Length=26" (measured)
  • 4.73 / 100 / 12 * 26 = 0.1025Ω

SimSmith T94-2 Core Loss Estimate
ss-T94-2-24T-S.ssx



SimSmith Inductor RUSE




T200-2 14T 4:1 Auto-Transformer



SimSmith Description
  • C1 Auto-Transformer RUSE, Parameters tuned to match VNWA measurement
  • S1.File = T200-2-14T-Auto.s2p (12-term correction VNWA measurement)
  • Files: ZL4AI.zip


SimSmith Auto-Transformer Model and VNWA Measurement
ss-T200-2-14T-Auto.ssx, useZo


SimSmith Auto-Transformer Model and VNWA Measurement
ss-T200-2-14T-Auto.ssx, xMtch



SimSmith Auto-Transformer RUSE