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| 無線電設備 > 天線系列 > Butternut 系列天線 > HF5B |
270-20 Model HF5B
Five Band Butterfly Beam Antenna |
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| Five popular HF bands 20, 17, 15, 12 and 10 meters in a rotatable, two element beam? No Lossy traps? YES! Butternut's innovative HF5B offers exactly that! Especially designed for the amateur with limited space, it offers significant improvement over omni-directional antennas, with useful forward gain and good front-to-side and front-to-back rejection of QRM. |
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| Wingspan: |
12 ft. 6 in. (3.8 m) |
| Boom Length: |
6 ft. (1.8 m) |
| Turning Radius: |
6 ft. 11 in. (2.1 m) |
| Vertical Spreaders: |
6 ft. (1.8 m) |
| Shipping weight: |
22 lbs. (10 kg) |
| Feed Point Impedance: |
Nominal 50 ohms. Includes RF connector for direct
connection to any length feed line terminated in PL-259 |
| VSWR at Resonance: |
1.5:1 or less |
| Power rating: |
500 watts CW/1200 watts PEP SSB input to the final. |
| Wind loading: |
3 ft2 (.3 m2) |
| Unguyed Wind Survival: |
80 mph (129 kph) |
| Bandwidth for VSWR of 2:1 or less: |
10 m - 1.5 MHz
12 m - entire band
15 m - entire band
17 m - entire band
20 m - 200 kHz |
| Gain: |
3+ dBd 20 m, up to 5 dBd on all other bands except 17 m which acts
as a rotary dipole |
| Front-to-back: |
up to 20 dB |
| Front-to-side: |
up to 30 dB |
| Minimum height above ground: |
30 ft. (9.1 m) |
Accepts up to a 1-1/2 in (38.1 mm) mast. Light enough to be turned with a TV rotator.
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