Portable Dipole with PTFE Twisted Pair Feed Line

#22 PTFE Insulated Twisted Pair Loss

  • Loss is computed by measuring R as series resonances of the line with open and short termination.
    Using loss equation: Loss = 8.686 * R/Zo. Where Zo is the transmission line impedance.
  • Line impedance, Zo = 110, measured by evaluating minimum SWR with several load values.
  • Velocity Factor = 0.77

TP Loss



SimSmith results for 28' high 20 Meter Inverted Vee

  • 53.25 feet Twisted Pair transmission line.
  • ATU simulated with SimSmith elements A and B.
  • Antenna simulation LastZ files from EZNEC.
  • Load Pin=.787 Transmission line plus ATU loss = 1.04 dB

SimSmith image



SimSmith results for 28' high 20 Meter Inverted Vee with RG-58A/U

  • 26.5 feet Twisted Pair transmission line.
  • 20 feet RG-58.
  • Load Pin=.818 Transmission line plus ATU loss = 0.87 dB

SimSmith image



AA-54 results for 28' high 34.75 foot Inverted Vee

  • 18 feet of the 100 foot twisted pair unfolded to form the dipole.
  • RigExpert AA-54 Antenna Analyzer
  • RigExpert AntScope Software
  • Using AntScope feature to subtract 82 feet of transmission line from the results using Vf, K1, and K2 measurements.
  • Long dipole used to solve length formula: 34.75 * 13.61 = 473
  • Length for 14.15 MHz: 473 / 14.15 = 33.4 feet

SimSmith image



AA-54 results for 28' high 33.5 foot Inverted Vee

  • Using AntScope feature to subtract 82 feet of transmission line from the results using Vf, K1, and K2 measurements.

SimSmith image



AA-54 results for 28' high 33.5 foot Inverted Vee with 53.25 foot Feed Line

SimSmith image



Antenna Mounted on DK9SQ Mast

Picture

Picture

Picture



Portable operation at Mansfield Dam Park

  • Twisted Pair cut to 26.5 feet
  • Choke Balun on Twisted Pair at Coax connection.
  • RG-58A/U to transceiver.

Antenna at park



Elecraft KX3 Portable Station

KX3 Portable Station



Workbench Art

Desk Art