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Palomar Engineers mc-1-500-50

MINI-CHOKER Coax Line Isolator, 500 Watts PEP

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mc-1-500-50 Description     Hide

MINI-CHOKER Coax Line Isolator, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz


Product Details:

  • Brand: Palomar Engineers
  • MPN: MC-1-500-50
  • Country/Region of Manufacture: United States
  • Effective Frequency Range (MHz): 1-60
  • PEP Power Rating (watts): 500 SSB (25% duty cycle), 250 Watts CW/FT8 (50% duty cycle)
  • Choking Impedance Range (ohms): 500-5000 (1-60 Mhz)
  • Common Mode Attenuation (db): 20-35db
  • Estimated Insertion Loss (db): .25 db
  • Input Connector Type: SO-239 female
  • Output Connector Connector Type: SO-239 female
  • Enclosure Size (LxWxH inches): 3" long, 2 in wide, 1.25" high


MINI-CHOKER(TM) Features:

  • Uses proprietary Multi-Mix, Multi-Core, Multi-Turn ferrite technology for maximum choking (up to -38 dB common mode noise rejection) and maximum bandwidth
  • 500 Watts PEP, 50 ohm SO-239 connectors In/Out, 1-61 MHz (usable to 100 MHz)
  • Works for all coax fed antennas from 1.8-61 MHz (160-6 meters) - excellent for multi-band beams, verticals, dipoles, magnetic loops and highly unbalanced off center fed antennas.
  • 2-5 times more common mode noise rejection, wider bandwidth and higher power then competing isolators


MINI-CHOKER feed line chokes are used to suppress common mode current carried on the outside of the coax braid which is often responsible for receiver noise and RFI in the receiver/transmitter. These chokes are very useful for suppressing RFI common mode current at the antenna feed point, at 1/2 wavelength intervals along the coax feed line and also at the entrance to the radio station.


This choke is available with a SO-239 input/output and ground/static bleeder stud (optional) for attachment to a ground rod. Use an isolator every 1/2 wavelength for the antenna operating frequency (include velocity factor in calculation). Use the ground lug option for long coax antenna feed lines (over 1/2 wavelength at the operating frequency of any antenna system in the near field of the coax).