40-6 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 OptionsProduct DetailsMPN: PAL4010LOOP-500, -1500, -5000Country/Region of Manufacture: USAInput ohms/Output ohms: 50 in/200 outFrequency Range < 2:1 SWR (MHz): Balun rated at 1.8-61 MHz for 1.5KW, 1.8-31 MHz for 3KW/5KWPEP Power Rating (watts): 500/1.5KW/5KWInput Connector: SO-239Output Connector(s): Eyebolts/Wing NutHardware Type: Stainless SteelEnclosure Size: 4"x4"x 2"(1.5KW), 4"x 4" x 4"(5KW)Weight (pounds): 3#(500)/4#(1.5KW)/5#(5KW)40-6 Meter Loop antenna (144' wire) + 500/1500/5000 Watt PEP rated 4:1 Current Balun + internal 1:1 Current Balun in one enclosure + 4 insulators for support
* Complete package - just add coax
* works multiple bands with ease
* can be configured as delta, square, rectangle or multi-sided horizontal loop (6 insulators included)
* Choice of 500, 1.5KW or 5KW PEP rated baluns to suit power needs
* No need for extra feed line choke as it is built into the 4:1 balun enclosure
After many requests we have created a compact, special balun for OCF and loop (Skyloop or Delta loop) antennas. The CB-4-1-1500/5000 is a CUBE enclosure containing a multi-core, broadband 4:1 impedance transformer in series with a 1:1 current balun for extra common mode current choking to keep RF current off the outside of the coax braid and on the antenna where it belongs. The extra choking action also means that the coax feed line will not act as a radiator causing unnecessary RF interference (RFI).
1.5KW Rated for full 1500 watts PEP and 1000 watts CW/FT8 (ICAS). 1.8Mhz – 61 MHz.
5KW Rated for full 5000 watts PEP and 1500 watts CW/FT8 (ICAS). 1.8Mhz – 61 MHz.
500 watt version is in "BULLET" format, 1.5KW is a 4 x 4 x 2 cube and 5KW is in 4" x 4" x 4" enclosure.
HF 1-61 MHz coax feed line common mode chokes
40-6 Meter Loop antenna (144' wire) + 500/1500/5000 Watt PEP rated 4:1 Current Balun + internal 1:1 Current Balun in one enclosure + 4 insulators for support
* Complete package - just add coax
* works multiple bands with ease
* can be configured as delta, square, rectangle or multi-sided horizontal loop (6 insulators included)
* Choice of 500, 1.5KW or 5KW PEP rated baluns to suit power needs
* No need for extra feed line choke as it is built into the 4:1 balun enclosure
After many requests we have created a compact, special balun for OCF and loop (Skyloop or Delta loop) antennas. The CB-4-1-1500/5000 is a CUBE enclosure containing a multi-core, broadband 4:1 impedance transformer in series with a 1:1 current balun for extra common mode current choking to keep RF current off the outside of the coax braid and on the antenna where it belongs. The extra choking action also means that the coax feed line will not act as a radiator causing unnecessary RF interference (RFI).
1.5KW Rated for full 1500 watts PEP and 1000 watts CW/FT8 (ICAS). 1.8Mhz – 61 MHz.
5KW Rated for full 5000 watts PEP and 1500 watts CW/FT8 (ICAS). 1.8Mhz – 61 MHz.
500 watt version is in "BULLET" format, 1.5KW is a 4 x 4 x 2 cube and 5KW is in 4" x 4" x 4" enclosure.
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.