{"id":483,"date":"2022-02-10T17:12:32","date_gmt":"2022-02-10T17:12:32","guid":{"rendered":"http:\/\/m0aws.co.uk\/?page_id=483"},"modified":"2022-02-10T17:21:12","modified_gmt":"2022-02-10T17:21:12","slug":"30m-efhw-inverted-l","status":"publish","type":"page","link":"https:\/\/m0aws.co.uk\/?page_id=483","title":{"rendered":"30m EFHW Inverted L"},"content":{"rendered":"\n

This is a design I’m currently working on based around a 12m Spiderpole<\/a>.<\/p>\n\n\n\n

Unfortunately the 12m Spiderpoles are out of stock so I can’t actually get on and build this antenna. It’s a pretty basic design that’s put together around a standard 49:1 Unun and a half wave of wire for 10.125Mhz.<\/p>\n\n\n\n

\"\"
30m EFHW Inverted L antenna wire view<\/figcaption><\/figure>\n\n\n\n

The antenna consists of 14.8046m of wire, 12m of which is vertical and 2.8046 horizontal from the top.<\/p>\n\n\n\n

\"\"
30m EFHW Inverted L 3D Field Plot<\/figcaption><\/figure>\n\n\n\n

The 3D field plot shows a pretty much circular radiation pattern with the typical null in the centre.<\/p>\n\n\n\n

\"\"
30m EFHW Inverted L 2D Field Plot<\/figcaption><\/figure>\n\n\n\n

Looking at the elevation slice there’s 5.53dBi of gain at 5 Deg, ideal for DXing. <\/p>\n\n\n\n

It’s worth noting that a fully vertical 14.8046m EFHW antenna for the 30m band would give 5.81dBi at 5 Deg so, the inverted L is only 0.28dBi down on gain and the overall radiation pattern is pretty much the same.<\/p>\n\n\n\n

As soon as I can get my hands on a 12m Spiderpole I’ll get this antenna built and on air.<\/p>\n\n\n\n

Summary:<\/p>\n\n\n\n

Total Wire Length: 14.8046m
Vertical Wire Length: 12m
Horizontal Wire Length: 2.8046m @ 12m above ground
Wire Dia: 1.5mm
Feed Type: 49:1 Unun or simple LC impedance matching circuit
Impedance: 50 Ohm
SWR: <1.5:1 across whole band<\/p>\n","protected":false},"excerpt":{"rendered":"

This is a design I’m currently working on based around a 12m Spiderpole. Unfortunately the 12m Spiderpoles are out of stock so I can’t actually get on and build this antenna. It’s a pretty basic design that’s put together around a standard 49:1 Unun and a half wave of wire for 10.125Mhz. The antenna consists … <\/p>\n

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