-part 4 Being the last part of about vertical antenna above sea water (see part 2 & part 3), we will discuss 40 m band vertical antenna which configured as 2 x 2 parasitic array. As shown in part 2, a vertical antenna with 2 elevated radials situated above seawater has a peak gain of…
-part 3- In the previous part, we talked about vertical antenna for 15 m band, while in the first part, we talked about 40 m band. Not so consistent isn’t it ? Well, let’s convert our 15 m band vertical antenna for 40 m band operation. Actually, converting/resizing an antenna for another band is pretty straightforward, especially if…
“…It’s a neat trick !…” -Fred Harris- -part 2 In the last article, we’ve seen that under typical ‘newcomer’ installation conditions, vertical antenna potentially perform better than the inverted-Vee antenna. But, there are two weaknesses of the vertical antenna; 1. The vertical antenna needs a very good ground system installation (not trivial) and 2. The vertical antenna that…
“…We, engineer, are really easy to believe, just show us the data…” -part 1 When it comes to inexpensive, easy, all around, resonant wire antenna, inverted-Vee configuration become the gold standard for the low-bander amateur radio operator. It provides good gain (we will see that later), good coverage (at least medium distance, up to 5000 km), and the-best-bang-for-your-money.…
In the antenna modeling activity, I use two software, MMANA-GAL and 4NEC2. I use MMANA-GAL for quick and easy modeling because the interface is very intuitive, while I use 4NEC2 for in-depth modeling because the tool is more complete than MMANA-GAL. One of 4NEC2’s most useful tools is integration with VOACAP so users can see antenna performance under certain…
