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SM4OTI's tower and antenna project
Hi OM!
Glad that you're checking in to this very simple web page. It consist of some pictures and video clips from the building of the tower and antennas.
2006 - After almost a year of struggling with the local authorities, the building permit was finally granted.
2006 - The holes for the guy wires and foundation poured with concrete.
2007 - The first 28m (90ft) of the tower lifted by the mobile crane.
2007 - The OB17-4 fourbander antenna by Optibeam mounted near the top of the tower.
2008 - The newly designed OB9-WARC tribander by Optibeam mounted at the very top of the tower.
2009 - Upgraded the Prosistel rotator PST61 to the bigger and more robust PST71.
2010 - WARC balun broken. Substituted to a new one.
As I always have had doubts regarding multiband antennas, I was surprised how well the antennas actually performed. The front to back ratio on the different bands equals a monobander. This was measured in a real-life-environment with a calibrated s-meter in dBm. The SWR curves are broadbanded and low over the different bands (slightly higher on the band edges on 40m).
The antennas are 35m (115 ft) respectively 40m (130ft) above the ground and no interaction could be noticed between them.
Hope to see you down the log soon!
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2007 - Antenna 1 (40, 20, 15, 10m)
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2008 - Antenna 2 (30, 17, 12m)
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2009 - Upgrading rotator
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2010 - Fixing broken balun
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Live video streaming - http://oticam.mine.nu
Video clips below requires an XviD codec (www.xvid.org) installed on your computer.
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Video 1 (Concrete - 4 MB) Video 2 (Lift #1 - 2 MB) Video 3 (Lift #2 - 1 MB) Video 4 (Lift #2 - 5 MB) Video 5 (Lift #3 - 116 MB) Video 6 (Balun - 1 MB) |