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ham:twinleadjpole

Twin-lead J-Pole Antenna

From [1]: “the J-Pole is an end-fed, halfwave antenna with a quarterwave matching section to allow feeding with 50-ohm coax. Being a halfwave antenna, it is not dependent on a ground or radials for proper performance.”

(All length converted from imperial units)

Material

  1. 1.5(24)m 300 ohm flat twinlead TV antenna ribbon
  2. 1.8(29)m (min) 50 ohm coax cable

Building

  1. Join the two leads of the ribbon at the bottom (strip about 6mm)
  2. Strip both leads 3.2cm from the bottom of the ribbon (including the length of the joined leads)
  3. Connect the coax to the ribbon on the stripped parts
  4. 38.7cm up from the connection of the shield to the ribbon, cut a 6mm notch in the lead
  5. Cut the ribbon to 1.3(72)m (94.6cm from the notch)

Tuning

References

  1. Craig LaBarge, WB3GCK. The Twinlead J-Pole. 1998.
ham/twinleadjpole.txt · Dernière modification: 2014-10-30 23:20 par oliviermehani