TOKO RAKOM BERKAH ELEKTRONIK: ANTENA HOME BASE VHF

Senin, 30 Juni 2014

ANTENA HOME BASE VHF

ANTENA VHF BASE STATION
- Diamond F-23H new ! 3 x 5/8 class, up to 7 db gain
- V2R Taiwan !! Strong construction and weatherproof yearsly
- Bae Gazden, local stuff but standing still yearsly !
- Hy Gain, the recommended local homebase antena

Menerima pembuatan antena G-7 / G-9, larsen racing, dll.

ENCYCLOPEDIA :

1 cm = 10 mm
1 feet = 30.48 cm
1 inch = 2.540 cm
1 meter = 1.094 yards
1 db = 1.122 (Volt/Current Ratio)
1 db = 1.259 (Power Ratio)
10 db = 3.162 (Volt/Current Ratio)
10db = 10 (Power Ratio)

1 nano farad (nf) = 1000 pico farad (pf)
1 mikro farad (mf) = 1000 nano farad (nf)

urutan warna pada resistor :
0. hitam
1. coklat
2. merah
3. orange
4. kuning
5. hijau
6. biru
7. ungu
8. abu-abu
9. putih
warna gold = toleransi 5% +/-
warna perak = toleransi 10 % +/-

Nilai Resistive relatif logam :
(dibandingkan tembaga)
1. Alumunium : 1.6
2. Emas : 1.4
3. Besi : 5.68
4. Nikel : 5.1
5. Perak : 0.94
6. Baja : 7.6 - 12.7
7. Brass :3.7 - 4.9

Nilai Velocity Kabel Coaxial :
1. RG-6 Belden 8215 = 75 ohm = 66
2. RG-8 TMS LMR400 = 50 ohm = 85
3. RG-8 Belden 9913 = 50 ohm = 84
4. RG-8 Belden 9914 = 50 ohm = 82
5. RG-8 Belden 8237 = 52 ohm = 66
6. RG-11 Belden 8213 = 75 ohm = 78
7. RG-11 Belden 8238 = 75 ohm = 66
8. RG-58 Belden 8240 = 53.5 ohm = 66
9. RG-58A Belden 8219 = 50 ohm = 78
10. RG-213 Belden 8267 = 50 ohm = 66
11. RG-214 Belden 8268 = 50 ohm = 66
12. LDF4-50A Heliax 1/2"= 50 ohm = 88
13. LDF5-50A Heliax 7/8"= 50 ohm = 88
14. TV Twinlead = 300 ohm = 80
15. Open wire line = 600 ohm = 92

Kecepatan Gelombang Radio
= 299.792.077 ~ 300.000.000 meter/detik
= kecepatan cahaya

Gain antena
1. Ground plane = 0.3 dbi / -1.8dbd (dipole)
2. Half wave dipole = 2.1 dbi / 0 dbd
3. 5/8 wave = 3.3 dbi / 1.2 dbd
4. quad loop = 4.1 dbi / 2.0 dbd
5. Yagi 2 elemen = 7.1 dbi / 5.0 dbd
6. quad 2 elemen = 9.1 dbi / 7.0 dbd