FT240-43 Torriod based on the W1JR design

£60.00

Email for availability

 W1JR-FT240-43-Balun.jpg  mounting_kit.jpg

 Balun With Out Mounting Kit £60.00

 Balun With Mounting Kit £75

 

FT240-43 Torriod based on the W1JR design

This form of choke is referred to as an Inline-Isolation Balun. Design is quite simple. 70cm of RG-303 high power coax coiled 8 times round a FT240-43 Toroid housed in a waterproof box and potted with Polyester resin. Termination is a chassis-mount SO-239 on opposite ends of the box.

Balun is tested with full UK power limit due to power restrictions; under perfect 1:1 SWR conditions the FT-240 can handle 1KW of power.

In-line Isolation Balun consists of

  • 10cm x 10cm x 5cm UV resistant Box
  • 1 x FT240-43 Torriod core
  • RG-303 high power Teflon Coax or similar
  • 2 x SO-239 Chassis Mounted Sockets
  • All fixing hardware stainless steel
  • Potted for 100% WX proofing
  • Feed at lowest band, E.G. 20m

 

Make your own balun

1:1 Balun Options

Steve G3TXQ has done a lot of research on the use of different types of cores and air cored ferrites, the results can be seen on the chart below. For a link direct to his page please click here

The two types I refer to within this site are the 8T RG58 on FT240-43 but substituting the RG58 for RG142. Also the 6 x FB-31-1020 on RG213. There are many other ways listed on Steve's list below and more info can be found on his site.

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http://www.karinya.net/g3txq/chokes/

 

 

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Manufacturing Hexbeams Since July 2009

G3TXQ Hexbeams Trading as Hexbeam UK since 31st March 2013

45 Amanwy Bryn Llanelli SA14 9AH

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mw0jze@g3txq-hexbeam.com

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