Making open wire feedline скачать в хорошем качестве

Making open wire feedline

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    • A timber antenna mast   is recommended. A suitable antenna coupler to use is the Z-match by VK5BR: http://users.tpg.com.au/users/ldbutle... PS: If you liked this video please consider supporting Amateur Radio VK3YE by: Subscribing on YouTube, Checking my books page at https://books.vk3ye.com Shopping on Amazon via: https://amzn.to/3iiDQXv , or Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you)