Ke holomua nei ka holomua ma ka honua, akā naʻe, ʻaʻole wikiwiki e like me kā mākou makemake. No laila, i kēia manawa, ʻaʻole hiki i nā miliona o nā kīwī ke loaʻa i kahi hōʻailona kikohoʻe me ka ʻole o nā koʻokoʻo, a ʻo ka mea hoʻolako e mālama i ka ʻoluʻolu o ka mea kākau inoa pono e hāʻawi i ka hōʻailona TV ma ke ʻano analog.
Nā mea i loko o ka moʻo o nā ʻatikala
- Māhele 3: Māhele Hōʻailona Analog
- Māhele 4: ʻĀpana hōʻailona kikohoʻe
- Mahele 5: Pūnaewele hoʻolaha Coaxial
- Mahele 6: RF Signal Amplifiers
- Mahele 7: Nā mea hoʻokipa Optical
- Mahele 8: Pūnaewele iwi kuamoʻo Optical
- Māhele 9: Ke poʻo
- Mahele 10: Hoʻoponopono i ka pūnaewele CATV
Hoʻolālā ka mokuʻāina e hoʻopau i ka hoʻolaha analogue o nā kaha TV
ʻOiai ʻaʻole pili pono kēia i ke kumuhana, ʻaʻole hiki ke haʻalele ʻole i kēia pilikia wela i kēia manawa.
No laila: pili wale kēia mau kamaʻilio ʻana i ka hoʻolaha. ʻO ia ka hōʻailona e hele ana ma ka lewa mai ka hale kiaʻi TV kokoke loa. ʻO ka moku'āina wale nō ke kuleana no kēia hōʻailona ma Rūsia, a ʻelua wale nō (ma kekahi mau ʻāina ʻekolu) mau multiplex e noho i loko. ʻO ka ʻāpana analog o ka hoʻolaha kelepona pili wale i nā mea hoʻolako a ʻaʻole paha e hele. No laila inā ʻaʻole pili kāu TV i kahi antenna e kū ana ma luna o ka hale a i ʻole windowsill, a laila ʻaʻole e pili kēia outage iā ʻoe. No ke aha wau e ʻōlelo ai "kokoke" a "ʻoi aku paha"? ʻO ka mea ʻoiaʻiʻo, ua hoʻolaha mua kekahi mau mea kelepona i ka pau ʻana o ka hāʻawi ʻana i nā hōʻailona analog i nā mea kākau inoa. He mea paʻakikī ke hoʻomaopopo i ka hoʻoikaika ʻana, no ka mea, e like me ka mea i ʻike ʻia mai ka Māhele 1 o kaʻu mau ʻatikala, ʻaʻole hiki i kēia ke lawe i ka mālama kālā nui ma nā mea hana: he mau kāleka hoʻonui wale nō i loko o kahi chassis maʻamau ke kuleana no kēia. ʻO ka hoʻokuʻu ʻana i nā alapine kaʻa he kumu kānalua hoʻi: ʻaʻohe pono i ka mākeke no nā ʻano kikohoʻe like ʻole e hiki ke hoʻokipa ʻia e hoʻololi i nā mea like ʻole. ʻO ke ala wale nō e loaʻa ai ke kālā ma ʻaneʻi ʻo ke kūʻai aku ʻana i nā pahu hoʻonohonoho i nā mea kākau inoa, akā e waiho mākou i ka lunamanaʻo o nā mea hana.
Nā Analog Signal Parameter
ʻO ka hōʻailona kīwī analog ka huina o ʻekolu hōʻailona: amplitude modulated brightness and color, a me frequency modulated sound. Akā no ka loiloi ʻana i ka nui a me ka maikaʻi, ua lawa ka lawe ʻana i kēia hōʻailona ma ke ʻano he hoʻokahi, ʻoiai ua ʻike mākou a pau ma mua o hoʻokahi manawa me ke kiʻi weliweli, maikaʻi ke kani mai ka TV. ʻO kēia ma muli o ka ʻoi aku ka maikaʻi o ka noise immunity o ka FM. No ke ana ʻana i nā ʻāpana hōʻailona analog, hāʻawi ka Deviser DS2400T i kēia ʻano hana:
Ma kēia ʻano, hiki iā ʻoe ke hoʻohana i nā pihi e hoʻololi i nā kahawai analog (e hoʻokuʻu ʻia nā kaha kikohoʻe) e like me ka TV. Ma kahi o ka hoʻolaha a me ka nūhou wale nō e ʻike mākou i kekahi mea e like me kēia:
Ma luna o laila hiki iā mākou ke ʻike i nā ʻāpana nui o ka hōʻailona: ʻo ia ke kiʻekiʻe ma dBµV a me ka ratio o ka pae hōʻailona i ka walaʻau (a i ʻole, ka mea lawe / walaʻau). No ka mea e pili ana nā kaila ma nā alapine like ʻole i nā ʻano like ʻole i ka wā o ka hoʻouna ʻana, pono ia e lawe i nā ana ma nā alapine (ma ka liʻiliʻi loa ma nā ʻelua ʻelua i ka pae alapine).
E like me nā koi GOST, pono ke kiʻekiʻe o ka hōʻailona ma ka hoʻokomo i ka mea hoʻokipa ma waena o 60 a 80 dB. I mea e hōʻoiaʻiʻo ai i kēia mau waiwai, pono e hāʻawi ka mea hāʻawi i ka mea kūʻai aku ma ka wahi pili (maʻamau he papa haʻahaʻa haʻahaʻa ma ka pae ʻana) kūpono loa 70-75 dB. ʻO ka ʻoiaʻiʻo, hiki i kekahi mea ke hana ma ka hale o ka mea kūʻai aku: maikaʻi ʻole a i ʻole ke kaula pōʻino, nā mea hoʻokaʻawale i koho hewa ʻole ʻia, kahi TV me kahi paepae sensitivity maikaʻi ʻole. ʻO kēia mau mea a pau e alakaʻi i ka attenuation hōʻailona. Akā maikaʻi ʻole ka pae hōʻailona kiʻekiʻe: ʻo kahi TV maikaʻi me ka circuitry kūpono, me kahi AGC kiʻekiʻe, hiki ke mālama palekana i kahi hōʻailona ma mua o 100 dB, akā ʻaʻole hiki i ka hapa nui o nā TV kūʻai ʻole ke hoʻokō i kēlā hōʻailona.
ʻO kahi hoa nui o kekahi hōʻailona he walaʻau. Hoʻokomo ʻia ia e nā mea hana ma ke kahua o ka hoʻokumu ʻana i ka hōʻailona, a laila hoʻonui ʻia nā mea hoʻonui me ka hōʻailona, a hoʻohui pū i kahi mea liʻiliʻi o lākou. No ka hōʻailona analog, he mea koʻikoʻi kēia: ʻo nā hau a pau, nā ʻōpala a me nā mea ʻino ʻē aʻe he leo e pono ke ana ʻia a, ʻoiaʻiʻo, e hoʻemi ʻia. No ka loiloi i ka maikaʻi o kahi hōʻailona analog, hoʻohana ʻia ka ratio o ka hōʻailona pono i ka walaʻau, ʻo ia hoʻi, ʻoi aku ka kiʻekiʻe o ka waiwai, ʻoi aku ka maikaʻi. Ua wehewehe ʻo GOST i ka waiwai liʻiliʻi e like me 43 dB; ʻoiaʻiʻo, loaʻa i ka mea kākau inoa, ʻoiaʻiʻo, ʻoi aku ka nui, akā no nā kumu like me ka attenuation, hiki i kēia ʻāpana ke hoʻonui i ke ala mai ka panel a i ka TV. ʻOiai ke manaʻoʻiʻo nei ʻaʻole hiki i ka wili passive ke hoʻokomo i ka walaʻau, hiki ke loaʻa ke keakea mai kahi kaula uila kokoke, no ka laʻana, a i ʻole ka loaʻa ʻana o kahi hōʻailona terrestrial ikaika mai kahi mea hou. Eia kekahi, hiki i nā mea hoʻokaʻawale haʻahaʻa a ʻelemakule paha ke hana i kā lākou hana - pono kēia e hoʻolohe.
Ma ka hoʻomaʻamaʻa, pili ka maikaʻi o ke kiʻi hope i ka TV ponoʻī. ʻOiaʻiʻo, ʻaʻohe redundancy o kahi hōʻailona analog no ka pale ʻana i ka walaʻau, akā ʻo nā kānana i nā mea hoʻokipa kiʻekiʻe, a me nā amplifiers i kūkulu ʻia, hiki ke hana i nā mea kupanaha, akā ʻo ka mea hāʻawi, ʻoiaʻiʻo, ʻaʻole pono e hilinaʻi i kēia.
Source: www.habr.com