RFT18-20 64:1Bal-Un 20W

This is a high efficiency matching transformer, ultraportable, for SOTA or other outdoor activities and not only. Based on a FaiRite larger size ferrite bead instead of a toroidal core ( NOT the FT82-43 or similar!) it has excellent thermal behavior and efficiency, > 85…90% (@3.6MHz). Enclosure design copyright Luis – CT2FZI. Technical description file available below in the Downloads Tab.


Main Features:

  • enclosure color: grey or black
  • manufacturer code: ROW-RFT18-20
  • ordering code: RFT18-20
  • applications: for 1/2 wire (EFHW antennas, QRP, SOTA, portable etc.)
  • fast deployment antenna wire length: ~ 9.35m (30.5ft) for 20m band (EU QRP region, 14.285KHz), min. 5..7m above ground
  • antena wire length: ~40m for 80-10m operation, use min. 20m of wire for decent results
  • transformation ratio: impedance transformation 64:1 (autotransformer, 3 + 24 turns, turns ratio 1:8)
  • compensation capacitor: 100pF MLCC 100V capacitor, 100Vdc inside
  • power handling: 20W and more (120s @ CW – core temp. is 25°C, on dummy load)
  • ferrite Bead Material: 43
  • frequency range: 3- 30MHz
  • transformer Efficiency: > 85…90% @ 3.6MHz
  • RF max. power depends on application: 20W CW
  • VSWR: < 2 with 3200Ω load (please see Datasheet below)
  • weight: 35g
  • dimensions: 8.8cm x 2.6cm x 2.6 cm

14,90 EUR (excl. VAT)

12 in stock

Technical description file:

Weight 130 g
Dimensions 6,1 × 3,55 × 1,27 cm

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