What can we expect from the stock ZX-YAGI 11-5DX
An analysis of the antenna using EZNEC PRO4 with NEC 4 NEC5 engines.
In order to keep it fair to all others:
- We did not implement losses due to material or matchingsystems
(peak gain should be fraction less if measured in the real world.)
The sizes we used are from the manual :
(click to enlarge pictures)
Above the freespace azimuth pattern
Above the freespace elevation pattern
Above the SWR diagram, a gamma-match was added (and needed) to obtain a good SWR.
Above the Gain / Front to back and Front to rear response versus frequency
Above the antenna Q.
If the Q factor is below 15 over a wide range of frequencies above and below the operating band, these
are very good stable antennas.
Q factors between 15 and 30 over a wide range of frequencies above and below the operating range
represent acceptable values for slightly less stable antennas.
Q factors between 30 and 50 indicate that they are relatively unstable antennas, although often in some
narrow part of the range they can have a lower Q factor.
Q factors over 50, regardless of the possible narrow parts of the lower Q band, represent extremely
unstable antennas. (SOURCE: YU1AW)