H A 2 M N
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H A 2 M N
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| ANTENNA | REMARKS |
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This is a typical high-gain vertical VHF antenna for 2 m FM operation. SWR is 1:1,01 on 145 MHz. This construction may be a substitute for HF vertical antennas operating fairly from 10 to 20 m (included WARC bands) and as a compromise from 30 to 40 m respectively. Should you have a hybrid radio or a antenna tuner you have a chance to tune the antenna for the band needed. The feed-line (a 50 Ohm low-loss coax cable of approximately 20 m in length (on the wall and roof) can also be utilized as antenna on 10, 12, 15, 20, 30, 40, 80, and 160 m bands. It is an end-fed loop as I call it high-handedly. That means the coax is short-circuited resistively at the match for 145 MHz. If you feed the high frequency into the shield and the ground into the center lead you will construct a very effective end-fed loop. Just a few Watts out needed and you are on the bands really. In addition low noise features this arrangement that is known advantage of loop antennas. All written above does not mean that you can compete with high gain antennas. It only means that you can be QRV on HF bands even though you have no choice to install regular HF antennas due to local circumstances. No theory has yet been worked out on how this kind of antenna effect works. Remember that we are talking about substitutes, based on experiments but not calculations. The VHF antenna used for HF frequencies has yielded 187 DXCC entities of 11,432 Qs 100 Watts out. The short circuited coax cable antenna as an end-fed loop is still under test and works fine on 20, 30, 40, 80, and 160 m running 4-25 W out to it. I need 10-15 m bands to open sooner or later and to have about 10,000 Qs on all bands to summarize its real capability. Momentarily, it can be said that the coax loop covers Europe on 40 m with 4-25 W output. It is more than expected after the very first tests. |
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