SM7GVF antenna for 144 MHz.
2005-10-23 One prototype 14 elements yagi, 9,8 m long, almost done.
2005-11-20 Three antennas completed
2006-07-07 All antennas completed
This picture show how I mount the 5,5 mm dia elements to the 28 mm
boom. I add glue also to prevent that
the lements rotates around the boom (wind, birds sitting on the
The antenna is based on DK7ZB optimized yagi, but I have changed the
first director position for
50 ohms instead, and use a bazooka choke for the unbalanced feeder.
Wheather protection is not solved yet.
Today I should verify VSWR on the third antenna, and found it to be
This little snow on the elements was the reason.
Will this new antenna (4x14 ele) outperform the old 6x15 NBS yagies
which I used in 1985-1990, shown below?
No, preliminary results (October 2006) indicates that 6 yagis is
better... BUT the number
of maintance hours is lower now I hope...
How wrong I was, the antenna came down in January 2007 (Storm "Per")