Tebulu ọdịnaya

Otu esi elele mmepụta ike nnyefe iji lelee ndị na-ebugharị vidiyo ikuku COFDM’ ezigbo ike ampilifaya n'ime?

Ka ibunye akara ngosi vidiyo ikuku na-aga n'ihu, onye na-ebufe chọrọ ihe nrịbawanye ike dị ike.

Yabụ kedu ka anyị ga-esi tụọ ike ampilifaya ikuku ikuku? Na vidiyo dị n'elu, ayi atuwo ub͕ò atọ COFDM-908T, nke enyere iwu n'aka ndị ahịa anyị. Onye ahịa a chọrọ nkwalite ike 10-watt maka nnyefe vidiyo ikuku ala. Ya mere, anyị na-atụle transmitter TX ike maka ya.

Anyị ga-eji ngwa pụrụ iche iji nwalee ike mmepụta RF nke ihe nrịbama vidiyo ikuku.

Mbụ, anyị kwesịrị ịma table nke mmepụta ike na ike amplifier ike. Nke a bụ ụfọdụ mkpụrụedemede n'etiti ike mmepụta yana paramita dBm nke ngwa ahụ gosipụtara.

20mW bụ 13dBm
200mW bụ 23dBm
1 Watts bụ 30dBm
2 Watts bụ 33dBm
5 Watts bụ 37dBm
10 Watts bụ 40dBm
20 Watts bụ 43dBm
50 Watts bụ 47dBm
100 Watts bụ 50dBm

Ndị na-ebugharị na vidiyo a niile nwere ihe nkwusa ọkụ 10-watt arụnyere n'ime ya, na ngwa kwekọrọ kwesịrị tụọ 40dBm.

N'otu oge ahụ, akụrụngwa anyị nwere 40dBm attenuator agbakwunyere, yabụ ngwa ahụ kwesịrị igosi arụmọrụ nke gburugburu 0dBm.

Ị nwere ike ịhụ ihe ngosi arụmọrụ na vidiyo: otu bụ 0 dBm, otu bụ 0.07 dBm, na otu bụ 0.18 dBm. Site na tebụl, anyị nwere ike ịhụ 0 dBm, Ha niile nwere ihe nrụnye ọkụ 10-watt arụnyere.

Na vidiyo na-esote, anyị ga-egosipụta otu esi agbanwe ike mmepụta site na bọọdụ mgbanwe parameter.

Anyị ga-egosi gị otu esi agbanwe vidiyo ikuku ikuku site na amplifier 2-watt gaa na otu-watt.

Biko cheta soro anyị Ọwa YouTube. Ọ bụrụ na ị nwere ntụnye ọ bụla maka nnyefe vidiyo ikuku ikuku COFDM na nnata, biko nweere onwe gị ịgwa anyị okwu.

Iji tụọ ike mmepụta RF nke ihe na-ebufe vidiyo ikuku, ị ga-eji mita ike na ihe mmetụta ike dakọtara na usoro mgbama onye na-ebufe na ụdị modulation..

Iji nweta ikike nnyefe kwesịrị ekwesị, ị ga-adabakwa na impedance nke transmitter na ihe mmetụta ike. Nke a bụ ụfọdụ usoro ị ga-eso:

Gbanwuo mita ike wee jikọọ ihe mmetụta ike. Lelee na a haziri ha nke ọma yana hazie ha.
Iji eriri coaxial, jikọọ mmepụta nnyefe na ntinye ihe mmetụta ike. Iji chebe ihe mmetụta ike site na mmebi nke ọkwa ike dị elu kpatara, jiri attenuation ma ọ bụ ibu dummy ma ọ bụrụ na ọ ga-ekwe omume.
Tọọ ugboro ole na ọnọdụ mgbanwe nke onye na-ebugharị dịka ịchọrọ. Dị ka ọ dị mkpa, gbanwee ọkwa ike mmepụta.
Lezienụ anya na uru ike gosipụtara na mita ike. Nke a bụ ike mmepụta RF nke nnyefe na watts ma ọ bụ decibels (dBm). Ọ bụrụ na ị nwere oscilloscope, ị nwekwara ike iji usoro voltaji kachasị elu-na-elu iji gbakọọ ike.
Achọrọ ihe njikọ ntụzịaka ma ọ bụ ihe nlegharị anya iji nyochaa oke ebili mmiri na-eguzo voltaji (VSWR), nke na-egosi ka esi kwekọọ nke ọma transmitter na ihe mmetụta ike.
Ngwa ndị a nwere ike gbakọọ VSWR site n'ịtụ ma n'ihu ma na-egosipụta ike. VSWR dị ala na-egosi ezigbo egwuregwu impedance yana mfu ike dị ala.