Vortex Antenna Systems 1 to 1 Ratio Wideband Current Choke Balun

Vortex Antenna Systems 1 to 1 Ratio Wideband Current Choke Balun

Vortex Antenna Systems 1 to 1 Ratio Wideband Current Choke Balun

£80.00

Product Code – VOR1TO1BALUN

A hand wound and constructed very high efficiency 1:1 Choke Balun based on the tested designs of  Dr. Jerry Sevick W2FMI. Sometimes called a ‘Choke Balun’ or Common Mode Choke’, this 1:1 ratio current balun can be used to prevent feedline radiation.

Constructed using only premium parts (Mainly from the USA) this balun uses *RG142/RG400/RG303 MIL-17 Spec Silver Coated Coax and will handle power levels up to 5kw (3kw from 36 to 54mhz). Uses include at the feed-point of a YAGI antenna to prevent feeder radiation and to de-couple the feed-line of vertical antennas, preventing the vertical radiator using your coax feeder as a radial. On analysis using DG8SAQ VNA Software, the choking impedance is approx 600 ohms on 160m, rising to over 4200 ohms at 10 Mhz. The balun is still very useful up to and including the 6m band.

See info below for mechanical and electrical details

  Vortex Antenna Systems 1 to 1 Ratio Wideband Current Balun

Balun Ratio:  1 to 1 (No impedance transformation)
Enclosure:  Fibox Polycarbonate to IP67 Rating
Coax:  *RG142/RG400/RG303 MIL-17 Spec, Silver Coated Braid and Center Conductor. Solid Teflon Dielectric (USA)
Coax Rating:  Typical 8kw at 14.0Mhz (3.5kw at 50Mhz)
Ferrite Core:  ‘K’ Series (Type 52 wideband material) (USA) x 1
Connector (In):  SO239 – Silver Plated, PTFE insulator
Connector (Out):  SO239 – Silver Plated, PTFE insulator or Stainless Steel M6 Hex Head Bolts (User Selectable)
Frequency Coverage:  1-54MHz
Power Handling:  5kw (1-35mhz), 3kw (36-54Mhz)
Choking Impedance:  Variable – Unit covers from 1.8 to 54Mhz with max choking impedance on 30 and 20m

* Stock dependant (RF characteristics of all three cables are nearly identical)