My antennas
Japanese : Jul. 19, 2011, English : May 5, 2012
Last update : June 16, 2018
Japanese page is here.
Overview of my antennas -- from May 2018
My antennas -- from May 2018
Left : GP-15, 40m dipole
Center : VX4000, A430S10R x2, UMX42A, 8-band dipole
Right : EH-V160ve
| Antenna type | Manufacturer, model | Bands | Antenna height above the ground |
| Radialless vertical | Diamond Antenna VX4000 | 2m/70cm/23cm | 13m |
| 10ele x2 Yagi-Uda antennas |
Diamond Antenna A430S10R x2 | 70cm | 13m |
| 2ele beam | Mini-multi Antenna UMX42A | 20/15/10/6m | 12m |
| 8-band dipole | Diamond Antenna W-8010 + elements of Sagant Antenna MT-WARC |
80/40/30/20/17/15/12/10m | 10m |
| Ground plane anenna | Comet Antenna GP-15 | 6m/2m/70cm | 9m |
| Dipole | Homebrew | 40m | 9m |
| EH antenna | FR Radio Lab. EH-V160ve | 160m | 8m |
HF beam antenna UMX42A
UMX42A is a 4-band - 20/15/10/6m - miniature beam antenna manufuctured by Mini-multi Antenna in Japan. It's a combination of a 20m 2-element Yagi-Uda antenna and a 15/10/6m 2-element Yagi-Uda antenna. It's one of the world smallest beam antennas including 20m band, because maximum element length is only 3.63m, boom length is 1.7m, weight is 10kg. Its bandwidth is wide for antenna size, because dual radiator system is adopted.
HF beam antenna UMX42A
( Upward of UMX42A, there are 70cm 10x2 Yagi-Uda antennas and a 2m/70cm/23cm
vertical )
Ferrite cores on the feedline of my UMX42A
VSWR characteristics of my UMX42A are shown in the table. When an user assembles UMX42A, he or she needs to choose either for CW use or for SSB use in 20m band. I chose for CW use.
| (Unit:MHz) | Sunny, 17 degrees Celsius | Rainy, 11 degrees Celsius | ||
| VSWR is 1.5 or less | VSWR is 2.0 or less | VSWR is 1.5 or less | VSWR is 2.0 or less | |
| 20m band (chosen for CW use) |
14.033 - 14.193 | 14.010 - 14.234 | Band edge - 14.090 | Band edge - 14.130 |
| 15m band | Band edge - 21.205 | Whole band | Band edge - 21.091 | Whole band |
| 10m band | Band edge - 28.910 | Band edge - 29.016 | Band edge - 28.779 | Band edge - 28.934 |
| 6m band | Band edge - 52.45 | Band edge - 52.70 | Not measured in detail, but OK between 50 and 52MHz |
|
I think that the bandwidth is wide for antenna size, and the influence of rain is relatively small.
8-band Dipole (from May 2014)
8-band Dipole consists of Diamond Antenna W-8010 (80/40/20/15/10m) plus elements of Sagant Antenna MT-WARC (30/17/12m).
Loading coils and a balun of W-8010 (Left photo)
Balun of my 8-band Dipole (Right photo)
VSWR characteristics of my 8-band Dipole
Bandwidth of my 8-band Dipole in kHz
| Band | VSWR is 1.5 or less | VSWR is 2.0 or less | VSWR is 3.0 or less |
| 3.5MHz | 39 | 58 | 90 |
| 7MHz | 100 | 170 | 260 |
| 10MHz | 150 | 250 | 460 |
| 14MHz | 380 | 550 | 980 |
| 18MHz | 1200 | 2100 | 3000 |
| 21MHz | 500 | 1300 | 2200 |
| 24MHz | 870 | - | - |
| 28MHz | 2000 | - | - |
160m EH antenna EH-V160ve (from Oct. 2012)
FR Radio Lab. EH-V160ve is a 160m band EH antenna. Its total length is only about 1.6m(typ.), weight is only about 4.5kg.
160m band EH antenna EH-V160ve
Ground system for my antennas
Grounding electrodes for my antennas consist of two copper plates and 37
ground rods. The grounding resistance is 5.5 ohms.
Copper plate used for my grounding electrode
(900 x 900 x 1.5mm)
My past antennas page is here。
Copyright (C) 2012-2018 by MATSUMOTO Koichi, JN3DMJ