FORCE 12 17M/12M DUALBAND YAGI BEAM ANTENNA

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The YAGI BEAM ANTENNA LFA-R is one of the latest designs from the desk of G0KSC. The LFA-R has no reflector, just a LFA (Loop Fed Array) hybrid driver laid flat on the boom with one close proximity director. This dual band version has the second band drive element placed close enough for ‘open-sleeve’ coupling to occur in order so service can be provided on a second band with a single feedline. LFA-R designs antenna do not give wide band performance (and thus are well suited to the WARC bands) but do give incredible levels of gain and F/B per foot of boom (see plots). This is an awesome performer for such a short antenna and in fact compares well or exceeds theperformance of larger antennas.

Performance

- Gain on 18.1 MHz: 6.89 dBi @ 18.110 MHz
- F/B on 18.1 MHz: 23.82 dBi @ 18.110 MHz
- Gain on 18M.1 Hz at 15m above Ground: 12.04 dBi
- Gain on 24.9 MHz: 7.18 dBi @ 24.90 MHz
- F/B on 24.9 MHz: 14.38 dBi @ 24.90 MHz
- Gain on 24.9 MHz at 10m above Ground: 12.23 dBi
- Power Rating: 5 kW+ (limited by balun)
- SWR 18.1 MHz: Below 1.4:1 from 18.08MHz to 18.180MHz
- SWR 24.9 MHz: Below 1.4:1 from 24.88MHz to 25.00MHz
- Turning Radius: 4.251m / 14fts

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