Mai sa. Raitim, shawng na antenna ni hta gaw, coaxial cable n re ai flat feeder ni hpe lang ma ai.
RF coaxial cables hpe daw lahkawng hku chye na ra ai.
RF: RF ngu ai gaw, 300kHz kaw nna 300GHz du hkra, lamu ga de nhtoi htoi wa lu ai wan n-gun hpe tsun mayu ai.
RF gaw radio frequency current rai nna, -frequency kaba ai galai shai ai wan n-gun hpe tsun ai ga si kadun re.
Second mi hta kalang 1000 hta n-pu galai shai ai galai shai ai n-gun hpe low-frequency n-gun ngu shamying nna, second mi hta 10000 lang jan galai shai ai hpe gaw high-frequency n-gun ngu shamying ma ai. RF gaw dai zawn re ai -frequency kaba ai.
RF (300K-300G) gaw nsen kaba ai (10K hta grau ai) n-gun kaba ai band kata na grau tsaw ai nsen band re.
Electronics theory hta, n-gun dat langai ngai hku nna lwi wa ai shaloi, n-gun dat n-gun dat a grup yin hta magnetic field byin pru wa ai; conductor langai hku nna galai shai ai wan n-gun lwi wa ai shaloi, dai conductor grup yin hta galai shai ai wan n-gun field byin pru wa ai. Ndai hpe wan n-gun n-gun (electromagnetic wave) ngu shamying ma ai.
100kHz npu na frequency nga ai Electromagnetic wave ni hpe lamu ga ntsa kaw na hkap la ai majaw, hkrak hkrak n mai shapoi ai. Raitim, 100kHz jan ai frequency ni nga ai electromagnetic wave ni gaw nbung hku nna hprawng hkawm nna, nbung a shinggan jut kaw na ionosphere hku nna nhtang wa ai majaw, tsan ai shara de -hprawng hkawm lu ai.
Anhte gaw, tsan ai shara de htawt sit lu ai atsam nga ai, n-gun kaba ai -wan n-gun hpe radio frequency (RF) ngu shamying ga ai.
RF hpaji hpe wireless matut mahkai lam hta grai lang ai; cable TV system ni hta RF shapoi ai lam hpe lang ai.
Coaxial cable: Hpa majaw nga yang, n-gun dat lahkawng (kata na n-gun/shinggan n-gun) gaw ga hte seng nna n bung ai majaw, kata na n-gun langai gaw kaga cylindrical shinggan n-gun a axis kaw nga ai majaw, dai hpe "coaxial cable" ngu shamying ma ai.
Coaxial cable ni a arawn alai langai gaw, wan n-gun n-gun hpe madung hku nna shinggan conductor kata kaw shinggrup da ai majaw, grau tsaw ai frequency ni hta jai lang mai ai.
Myit yu na lam: Coaxial cable a shinggan na conductor gaw conductor hte shielding layer lahkawng yan rai nga ai (loop lahkawng yan hku nna galaw nna, -hkap la ai lam hpe ninghkap ai magam bungli hpe jaw ya ai).
RF signal ni hpe shapoi na matu lang ai coaxial cable hpe "RF coaxial cable" ngu shamying ma ai.
Antenna kaw na hkam la ai signal hpe feeder line hku nna shawng na maga de sa ya nna, shawng na maga kaw na pru wa ai signal hpe mung feeder line hku nna hkap la ai jak amyu myu de sa ya ai.
Ya aten hta, shawng na-line wireless signal tower (China Mobile, Miwa Unicom, Miwa Telecom, etc.), hka htung npu, npu nta ni zawn re ai signal jat ai ladat ni hta lang ai matut mahkai hte shapoi ai feeder ni hpe law law lang mu lu ga ai.