Antenna Double Eagle. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / VHF antennas
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The antenna is a dual-band vertical antenna array for frequencies of 260-390 MHz.
Eagle - antenna - half-wave vibrator for two bands, the jumper adjusts the matching for a 50 or 75 Ohm cable.
When assembled on a metal mast, the diagram is cardioid, the gain is higher along the axis. The design is simple and made from improvised materials.
The tuning consists in the gradual shortening of the vibrators to the desired frequency. For tuning, the author used the frequency response meter X-1-50.
The adjustment is made according to the well-known method for the minimum SWR in the measuring cable 10-15m long.
With a distance between the floors of the antenna array equal to 600 mm, the length of the segments of the connecting cables (75 Ohm) is 660 mm. Then there is a 50 ohm cable to the device.
In test results, the antenna outperforms the DX-60 and commercially manufactured log-periodic antenna.
Publication: cxem.net
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