Explaining End Fed Half Wave Antennas & Experimentation скачать в хорошем качестве

Explaining End Fed Half Wave Antennas & Experimentation

This presentation explaining the basics of End Fed Half Wave (EFHW) antennas was done at the REAST DATV experimenters night hosted by Justin VK7TW and Hayden VK7HH. Topics covered were the basics of EFHW antennas by Steve Yates AA5TB including lengths, design and installation of the antenna. Voltage and current distribution and the issues this presents, the minimum counterpoise, impedances and turns ratios of end fed impedance transformers. Hayden VK7HH then took the audience through a great presentation on his experiments with his EFHW. Hayden covered the modification based on the VK4YE design, the testing, and the additional 80m loading coil, the coax counterpoise, and the common mode toroids. This allows a antenna for smaller spaces. Toroids 👉 https://geni.us/zl6H FT-240-31 👉 https://geni.us/tLvfMqw (Amazon) FT140-31 👉 https://geni.us/ps6to (Amazon) Some links are affiliate and I may receive a small commission on sales ► $15 OFF at Radioddity: http://radioddity.refr.cc/haydenvk7hh References: Steve Yates – AA5TB http://www.aa5tb.com/efha.html http://www.aa5tb.com/efha_wrk.html http://www.aa5tb.com/coupler.html Ben - VK7BEN https://www.vk7ben.id.au/2017/01/09/e... VK4YE http://sarc.org.au/wp-content/uploads... Steve Dick - K1RF (The End Fed Half Wave Antenna) http://gnarc.org/wp-content/uploads/T... http://reast.asn.au/ ⏱️TIMESTAMPS⏱️ 0:00 End Fed Half Wave Fundementals 0:43 Voltage and Current Distributions 2:32 What are End Fed Half Wave Antennas? 4:01 Counterpoise or no Counterpoise 7:06 Son of Counterpoise 8:24 How to Make a EFHW Work - Tuning 10:36 Coupler Learnings - Counterpoise and SWR 12:19 AA5TB Musings 13:22 Extending this to other Antennas 15:30 VK7HH Introduction - 5 Band End Fed Design by VK4YE 17:55 EFHW Layout 18:49 49 to 1 Impedance Transformer build 20:22 80 Meter Loading coil construction 21:59 Installation of the Antenna 22:50 Common Mode Current Choke 29:01 SWR Results 33:07 How many toroids should you use? 35:23 A Full Size 80m EFHW is actually a multiband antenna! 36:29 Adding 160m capability 🎥 Watch more recent videos here:    / hamradiodx   Support Ham Radio DX: ► Patreon:   / hamradiodx   ► YouTube Memberships:    / @hamradiodx   ► PayPal Tip Jar: https://www.paypal.com/donate?hosted_... ► Merch: https://hamradiodx.net/merch ► Buy Ham Radio products on Amazon & eBay: https://geni.us/HamRadioDX ► Gear I Recommend: https://www.amazon.com/shop/hamradiodx (Affiliate) Items in My Shack: ► https://www.hamradiodx.net/vk7hh-shack Follow Me: ► Website: https://hamradiodx.net ► Facebook:   / vk7hh   ► Instagram:   / hamradiodx   ► Twitter:   / hamradiodx   ► Discord:   / discord   ► Ham Mail: Hayden Honeywood - P.O Box 5071, Sandy Bay Tasmania 7005 Australia #HamRadio #EFHW #EndFedHalfWaveAntenna Music: Bensound: https://www.bensound.com/royalty-free... Epidemic Sound: https://www.epidemicsound.com/