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CARA MENGHITUNG PANJANG KABEL

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CARA MENGHITUNG PANJANG KABEL



panjang kabel
(300/frek) x velocity coax x kelipatan ganjil
contoh
frek di 100 Mhz pake kabel rg 58 kabel yang tersedia 14 meter
(300/100) x 0.66 x 5 = 9.9 bila terlalu panjang motongnya
(300/100) x 0.66 x 7 = 13.86...paling mendekati 14 meter

Contoh penggunaan tabel velocity.
Membuat kabel jumper dengan RG58 di frekuensi 100mhz maka

(300/100)/2*0.66 = 99cm

ak machmud apakah velocity ini digunakan juga untuk menentukan panjang antena???
contoh kita mau buat antena 1/4 lamda di 100Mhz dan transmisi line kabel rg 58 maka

(300/100)/4*0.66= 0.495 cm begitu pak?

((300 dibagi frekuensi)/2*velocity)JUPER SWR

Untuk nge-match coax bisa juga dengan pemancar caranya :
a. Siapkan pemancar yang 5watt saja
b. Kabel jumper yang sudah diukur pada frekuensi yang diinginkan. Nah jumper ini pesan kepada yang punya swr analizer
c. Ujung jumper masuk ke pemancar dan ujungnya lagi ke swr.
d. output swr tutup dengan conector T dan salah satu ujung conector T tsb tutup dengan dumyload tanpa jumper
e. Ke ujung satu lagi connector T masukan kabel transmisi dan dip ujungnya sedikit-sedikit sd swr rendah
Silahkan dicoba

Untk jumpernya masih bisa pakai rumus
Misal pakai RG8 yang tengahnya serabut maka (((300/100)/2)*.66) = 99cm

Secara teori panjang coax untuk jumper maka 1/2 lamda X velocity, misal RG8 tengahnya serabut,  frekuensi 100Mhz maka (((300/100)/2*.66) hasilnya 99cm bila dikalikan 30 maka menghasilkan 29.70m, tetapi pada kenyataannya mungkin lebih atau kurang dari 29.7M
bisa saja jadi 29.55m atau 29.80m, mengingat coax tsb belum tentu flat impedansinya dari ujung sd ujung.

Rumus tsb berlaku untuk semua jenis coax, antenanya terserah antena apa pun tak jadi masalah.

2 Comments

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    BalasHapus
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