[TowerTalk] More from the M2 antennas quality control file
normanlizeth at gmail.com
Mon Apr 13 09:42:17 EDT 2015
Do have a question. How does one characterize an unknown antenna's
parameters? If I understand it correctly, to characterize the "real
world performance" (using the sun) of this type of antenna, G/T needs
to be known.
How do I figure this out (G/T)? Am curious how to do this as it's a
good tool (sun noise) to measure performance with out a lot of gear or
an antenna range.
On Mon, Apr 13, 2015 at 9:26 AM, Jim Lux <jimlux at earthlink.net> wrote:
> On 4/13/15 5:37 AM, Patrick Greenlee wrote:
>> I'm not a Yagi guru or an EZNEC modeler. Can someone tell me what 1/16
>> of an inch in element length means in performance parameters in the
>> example below? I have done mostly wire antennas and 1/16 or 1/8 didn't
>> seem to make much difference.
> this is a 432 MHz antenna with a lot of elements where the elements are
> about a foot long overall.
> 1/16" if it's on both sides, is shortening the element by about 1%
> The element lengths are critical to getting low side/back lobe performance,
> although it doesn't change forward gain very much.
> As you note, on something like a dipole, a change of a few percent doesn't
> change the performance all that much.
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