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20-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options20-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP OptionsSKU PAL-LOOP2006-500List price $189.95 Save 21%$149.95On Sale40-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (40, 20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options40-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (40, 20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP OptionsSKU PAL-LOOP4010-500List price $189.95 Save 11%$169.95On Sale
50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop Antennas50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop AntennasSKU CB-2-2000EBList price $159.95 Save 19%$129.95On Sale
50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KW50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KWSKU CB-2.25-1500TSList price $159.95 Save 31%$109.95On Sale
50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long Wire50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long WireSKU CU-9-1500List price $129.95 Save 15%$109.95On Sale
CUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB SuppressionCUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB SuppressionSKU CU-1-1500SOList price $149.95 Save 27%$109.95On Sale
FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Bulk Pack of 10FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Bulk Pack of 10SKU F240-31-10List price $100.00 Save 10%$89.95On SaleFT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Mini Pack of 3FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Mini Pack of 3SKU F240-31-3List price $34.95 Save 14%$29.95On Sale
Ferrite Mini Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 10 filters (3/8, 1/2, 3/4)Ferrite Mini Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 10 filters (3/8, 1/2, 3/4)SKU FMSCP-31-10List price $55.95 Save 11%$49.95On Sale
Ferrite Ring and Snap On Combo Pack - 10 Rings (1.4" ID) + 10 Snap On Beads (1/2" ID) - Mix 31 (RFI Range 1-300 MHz) FREE USA SHIPPINGFerrite Ring and Snap On Combo Pack - 10 Rings (1.4" ID) + 10 Snap On Beads (1/2" ID) - Mix 31 (RFI Range 1-300 MHz) FREE USA SHIPPINGSKU FRSCP-31-20List price $155.00 Save 10%$139.95On Sale
Ferrite Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 1/4, 3/8, 1/2, 3/4 - 22 filtersFerrite Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 1/4, 3/8, 1/2, 3/4 - 22 filtersSKU FSCP-31-22List price $108.00 Save 12%$95.00On Sale
Ferrite Snap on/Ring Combo Pack, Mix 31, RFI Range 1-300 MHz - 16 filtersFerrite Snap on/Ring Combo Pack, Mix 31, RFI Range 1-300 MHz - 16 filtersSKU FSRCP-31-16List price $112.00 Save 15%$95.00On Sale
Garage Door Opener RFI Kit, Low Freq (150 KHz-10 MHz) for AM Broadcast or High Freq (1-300 MHz) for Ham Radio or Commercial RFIGarage Door Opener RFI Kit, Low Freq (150 KHz-10 MHz) for AM Broadcast or High Freq (1-300 MHz) for Ham Radio or Commercial RFISKU RFI-GDOList price $49.95 Save 30%$34.95On Sale
Home Theater System RFI Kit for up to 4 HDTV, A/V units + I/O cables - 12 filtersHome Theater System RFI Kit for up to 4 HDTV, A/V units + I/O cables - 12 filtersSKU RFI-HTSList price $89.95 Save 22%$69.95On Sale
Hybrid 6:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5KW/5KW PEPHybrid 6:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5KW/5KW PEPSKU CB-6-1-1500List price $189.95 Save 21%$149.95On Sale
Kurt Speaks Out - Digital PDF Version - Download Now!Kurt Speaks Out - Digital PDF Version - Download Now!SKU KURT-KSO-PDFList price $14.95 Save 100%$0.00On Sale
Laptop Computer with DC power RFI Kit - 7 FiltersLaptop Computer with DC power RFI Kit - 7 FiltersSKU RFI-LaptopList price $34.95 Save 14%$29.95
MINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW AntennasMINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW AntennasSKU MB-1-500SS$69.95
HF 1-61 MHz coax feed line common mode chokes
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1:1 feed line Chokes (also known as feed line current chokes, common mode chokes, line isolators, current mode chokes, and 1:1 baluns/ununs) are available in kit form or assembled form in a weatherproof Current Unun and Balun Enclosure which we call a CUBE™. All 1:1 chokes are ferrite based and are designed for 50 ohm coaxial cable input and 50 ohm output. 1:1 Ferrite toroidal or bead chokes have a higher choking impedance than our popular Sleeve Chokes and various models are available for specific frequency ranges and power levels.
1:1 Chokes are useful for choking common mode currents that may flow on the exterior of the coax cable shield while allowing the signals on the interior of the shield and the center conductor to flow unaffected and keeping the common mode current on the antenna. They isolate the coax shield and prevent it from becoming part of the antenna system.
1:1 Chokes are useful between balanced lines for center fed dipoles at their fundamental frequency (468/f (MHz), beam antennas with a 50 ohm balanced driven element, G5RV, loops, yagis, NVIS antennas, mobile installations, portable antennas and anywhere common mode current (or RFI) is a problem. They are also helpful between transmitter and linear amplifier or between linear amp and antenna tuner or as isolation chokes where higher choking impedance is needed (in the range of 2K-7K ohms).
1:1 Chokes are also very useful as feed line current chokes at the “radio end” of the antenna (we call them coax noise filters) where they choke/filter common mode current induced onto the coax shield from radiated waves (from your antenna, and other sources such as DSL routers, computer devices, plasma TVs, etc. originating in your house or your neighbor’s house). For RFI issues see RFI/EMI Solutions for general use or for specific radios and devices.
For best results we recommend a 1:1 choke at the “antenna end” of the coax and a coax noise filter at the “radio end” of the coax. (A side benefit is a reduction in noise level caused by common mode currents). 1:1 chokes are also available as Sleeve Chokes (Slip on or Snap on) for ease of installation and light weight on the antenna.