Making open wire feed line




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This is post 2337 in a continuing series of simple ham radio antennas.

Thanks to Australian radio amateur Peter Parker (VK3YE) for this simple way to make a balanced, open wire feed line for your HF antenna. 

If want multi-band performance from a single HF wire antenna, then using a balanced (open wire) antenna feed line is the way to go.

Here are some general remarks from Peter:

Open wire feedline is a cheap and low-loss feedline ideal for feeding HF dipoles. Open wire can tolerate significant impedence mismatches without adding much loss and in conjunction with a balanced antenna coupler allows multiband operation on a single dipole. Unlike a coax fed antenna the length of the dipole is not critical but for best efficiency aim for a minimum 3/8 wavelength at the lowest operation frequency (ie 30 metres for 3.5 MHz or the 80 metre band). Open wire should ideally be fed away from the antenna wire at right angles (to maintain balance) and kept away from metal objects such as masts and guttering. If using a mast in the middle of the antenna a timber one such as shown here http://www.youtube.com/watch?v=tWq4tg... is recommended. A suitable antenna coupler to use is the Z-match by VK5BR: http://users.tpg.com.au/users/ldbutle...
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Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

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