dlec
Freebander
Registered: 03-2013
Location: Germany
Posts: 28
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27 MHz LFA YAGI 3 Elements (self build)
27MHz LFA YAGI 3 Elements
By http://www.14lv108.sitew.com/#antennas.B
Last edited by dlec, 4/Apr/2013, 5:51 pm
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4/Apr/2013, 5:45 pm
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henry hpsd
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Registered: 02-2010
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Re: 27 MHz LFA YAGI 3 Elements (self build)
Hello,
I perfectly understand you think the data provided is accurate.
But i do believe, in this case the provided data can be "improved".
As it seems the designer used a programm called MMana:
Mmana uses a mininec "engine" and is less accurate with loop and tappered elements.
If you use a NEC4 engine (what one should do..) You will find out..
At 27.000 It will have 8 dBI and a front to back of 16 dB
At 27.555 it will have 8.6dBI and a front to back of 18 dB.
The resonant impedance is around 40 ohms.
And "happens" around 27.45 Mhz.
The 2 to 1 SWR bandwidth is around 600 Khz.
You will NOT get a perfect 1:1 swr without adjustments. (or internal loss)
So, what im saying..Although I highly value the effort of the designer...In my opinion the antenna could be improved
Kind regards,
Henry
Last edited by henry hpsd, 4/Apr/2013, 9:58 pm
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4/Apr/2013, 9:45 pm
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Oksana
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Registered: 10-2014
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Re: 27 MHz LFA YAGI 3 Elements (self build)
Good evening
What is the length of the boom of this antenna? 3,56 m ?
Thanks in advance for the reply.
Oksana
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16/Oct/2014, 6:41 pm
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