{"id":2755,"date":"2014-11-01T20:54:38","date_gmt":"2014-11-01T20:54:38","guid":{"rendered":"http:\/\/lefars.org.uk\/WPblog\/?p=2755"},"modified":"2014-11-02T15:14:08","modified_gmt":"2014-11-02T15:14:08","slug":"60ft-portable-vertical-antenna","status":"publish","type":"post","link":"https:\/\/lefars.org.uk\/WPblog\/60ft-portable-vertical-antenna\/","title":{"rendered":"60ft Portable vertical antenna."},"content":{"rendered":"

Today the weather was ideal for some \/p over Hornchurch Country Park.<\/p>\n

Equipment<\/strong><\/p>\n

85Ah Battery, Icom 7200, 18m Roach Pole, Inductor 340\u00b5H.<\/p>\n

The roach pole provided 18m (60ft) of antenna, and when coupled with the inductor at 15m provided a match at 1880 kHz. The ATU was used to provide a match at 1910 kHz the club top band frequency. It makes it all a bit critical having the inductor so high, but the big advantage is that the bottom 15.5 metres has a lot of current in it, leaving only the 2.5 metres above it at a high impedance, making a better radiator. Ground was provided by a chicken wire fence, which I have used many times before with good results.
\n<\/a>\"m0taz\"<\/a>\"60<\/a><\/p>\n

Below is a short video and some pictures showing the antenna first on 24MHz where Dave is working Bahrain where the vertical was set up close to a ? wave, then afterwards, it\u2019s fully extended with the loading coil 15.5 metres up, making it a loaded\u00a0\u00bc\u00a0wave for 160m. I calculated for 1900kHz, so I guess 70kHz off isn\u2019t bad! It would be easy enough to fine tune it. Lovely day for it, a bit breezy towards the end though!<\/p>\n