A 1:1 Choke/Line Isolator for use across HF frequencies and handles up to 1kW RF power (assuming 1:1 SWR). Internally, it's the same as our 1:1 Balun but with SO239 connectors at each end. Wound using RG142 coax on an FT240-31 core, this Choke offers resistive performance 3.5MHz up to 30MHz - Much better than an "ugly-balun" made from 20ft of RG58 around a bottle/pipe!
160m/80m : If you intend to use this Choke below 15MHz, we can supply it with 12 turns instead of the usual 8. This gives improved choking performance on the lower bands. Please note that this is a custom option and will usually add 24 hours to the delivery time.
Picture 3 shows the inside of a similar model, the Doublet/G5RV Choke which has the same core/coax, but screw terminals rather than an SO239 connector.
We also have a 100w version in a smaller box, too!
Made (and used) by us - Be weary of any supplier who can't (or won't) tell you what's inside the box you buy!
Choosing a Balun
We are often asked "what balun should I use?" by customers - here's our simple guide to choosing the right one: