Difference between revisions of "Antenna Double Bazooka"
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Latest revision as of 09:43, 11 May 2010
Rumus Antenna dalam Meter
Panjang Total Antenna (m) = 140.21 / frekuensi (MHz) Panjang Total coax (m) = 99.06 / frekuensi (MHz) Panjang Twinlead satu sisi = (Total Antenna - Coax) / 2
Beberapa Hasil Perhitungan
| Frekuensi (Mhz) | Total Antenna (meter) | Panjang Coax (meter) | Twinlead / sayap (meter) | Min. Tinggi dr tanah (meter) | Min. Tinggi ujung dr tanah (meter) |
|---|---|---|---|---|---|
| 1.618 | 86.66 | 61.22 | 12.72 | 18 | 5 |
| 3.550 | 39.5 | 27.9 | 5.8 | 12 | 5 |
| 3.8 | 36.9 | 26.07 | 5.41 | 12 | 5 |
| 7.025 | 19.96 | 14.1 | 2.93 | 8 | 3 |
| 7.070 | 19.83 | 14.01 | 2.91 | 8 | 3 |
| 7.110 | 19.72 | 13.93 | 2.89 | 8 | 3 |
| 10.147 | 13.82 | 9.76 | 2.03 | 8 | 2 |
| 14.070 | 9.97 | 7.04 | 1.46 | 8 | 2 |
| 14.150 | 9.91 | 7.00 | 1.45 | 8 | 2 |
| 18.105 | 7.74 | 5.47 | 1.14 | 8 | 2 |
| 21.070 | 6.65 | 4.7 | 0.98 | 8 | 2 |
Bagi yang kesulitan mencari kabel 300 ohm, dapat membuat sendiri Ladder Line 300 ohm melalui rumus
Z = 276 log ( 2S/d ) S = (d/2) 10 * exp(Z/276)
S = Spasi antar kabel d = diameter kabel
Contoh untuk Z = 300 ohm
d = 1.5 mm S = 22.2 mm
d = 2.5 mm S = 37.07 mm