COFDM Wireless Video Transmitter thiab Receiver
Cov Lus Qhia
COFDM Wireless video transmitter thiab receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
loj: 90x 65 x 22 mm
Kev nce qib tsis ntev los no hauv COFDM (Coded Orthogonal Frequency Division Multiplexing) wireless video transmitter thiab receiver technology tau hloov pauv li cas video kis tau thiab tau txais. COFDM yog ib qho kev hloov kho uas tso cai rau cov ntaub ntawv digital xa mus rau ntau qhov ntau zaus, ua rau lub teeb liab txhim khu kev qha thiab txhim kho cov ntaub ntawv xa mus.
Peb siv COFDM thev naus laus zis hauv ntau daim ntawv thov, xws li digital TV, wireless video kis tau tus mob, thiab cov xov tooj cua. Nws kuj pom muaj nyob rau hauv cov tub rog thiab aerospace daim ntaub ntawv xws li satellite kev sib txuas lus thiab unmanned aerial tsheb.
Thaum kawg, Kev nce qib tsis ntev los no hauv COFDM wireless video transmitter thiab receiver thev naus laus zis tau hloov pauv txoj kev xa thiab tau txais cov yeeb yaj kiab. Cov thev naus laus zis no tau ua kom muaj kev txhais cov yeeb yaj kiab zoo tshaj plaws hauv cov tes hauj lwm wireless, nrog rau kev xa tawm video hla ntau lub network thiab cov khoom siv. Kev siv cov txheej txheem coding siab heev, xws li kev kho qhov yuam kev rau pem hauv ntej (FEC) thiab adaptive modulation, tau enabled no.
5-watt PA COFDM Wireless Video Transmitter
5-Watt PA COFDM-912T Qhov hnyav
Pob rau ib qho tag nrho ntawm COFDM Wireless Video Transmitter
FAQ ntawm COFDM Wireless Video Transmitter thiab Receiver
Nyob zoo, Kuv tab tom nrhiav rau ntev-ntau hd video transmitter nrog hdmi input thiab receiver nrog hdmi tso zis.
Koj puas xav tau ib ib txoj kev los yog ob txoj kev system? As many as 16 people have liked the video Kwv Txhiaj, koj puas tseem xav tau xa cov kev tswj hwm ntawm lub drone?
Tsuas yog xa thiab tau txais hauv lub chaw soj ntsuam. Lub tswv yim yog siv HDMI tso zis ntawm cov chaw taws teeb tswj thiab rov xa mus rau hauv nruab nrab. Lub drone muaj qhov system xa tawm hauv internet, tab sis tsis muaj internet hauv suab puam, yog li peb yuav tsum rov xa rov qab tab sis tsis nrog internet.
OK, peb ib-txoj kev ntev-ntau wireless video kis tau tus mob yog lub hauv paus ntawm COFDM technology (zoo ib yam li DVB-T digital TV tshaj tawm). Nws tsis yog nyob rau hauv lub hauv paus ntawm Internet.
Puas yog COFDM wireless video transmitter thiab receiver muaj AES 256 los yog 128 encryption? cov zis hom yog full hd?
Yog, COFDM-912T txhawb AES 128 encryption. Thov ceeb toom rau peb ntxiv rau a Parameter Configuration board rau kev teeb tsa AES128 lo lus zais thaum koj tso qhov kev txiav txim. Nws yog xaiv tau los yuav.
COFDM-912T transmitter tsuas yog txhawb SD720P Video tswv yim. Yog li txawm tias lub receiver muaj HDMI tso zis, nws tsis tuaj yeem tso tawm tiag 1080P siab-txhais yees duab, ib 720p.
Yog tias koj muaj kev xav tau siab heev ntawm lub ntsiab lus ntawm daim duab tso zis, Kuv xav kom koj xaiv tus qauv uas ob lub transmitter thiab receiver txhawb 1080P, COFDM-908T
Nws tuaj yeem ncav cuag 30 km ncig?
Hauv kev taw qhia ntawm wireless video kis tau tus mob, tag nrho cov kis kis tau tus mob hais txog yog nyob ntawm qhov pom ntau yam (LUB). 2WPA fais fab amplifier txhawb nqa 30 kilometers thiab feem ntau yog siv rau ntawm drones. Qhov siab yog siab heev thiab lub receiver yog nyob rau hauv av, yog li muaj qhov pom tseeb qhov siab qhov sib txawv ntawm lub transmitter thiab receiver, thiab lub teeb liab wireless kis tau raws li lub waveform. Lub teeb liab poob yog me me thiab lwm yam cuam tshuam me me heev.
Koj tau hais tias koj qhov kev siv qhov xwm txheej yog tias ob qho tib si transmitter thiab receiver nyob rau hauv av, tshwj xeeb tshaj yog nyob rau thaj chaw suab puam, thiab tej zaum yuav muaj dov xuab zeb dunes. Yog li ntawd, lub teeb liab kis wirelessly yog yooj yim cuam tshuam nrog. Yog li ntawm no yog cov lus qhia:
1. Sim siv lub tshuab hluav taws xob siab, xws li 10 Watts lub 20 Watts. Ntau ntawm peb cov neeg siv khoom nkoj siv 20W transmitters.
2. Sim siv lub kav hlau txais xov siab dua lossis muab lub kav hlau txais xov rau ntawm lub ru tsev lossis lub toj nyob ze, thiab koj tuaj yeem nce lub kav hlau txais xov tripod. Peb cov neeg siv khoom ib txwm xaiv qee yam 1.8-' meter ' FRP omnidirectional fiberglass kav hlau txais xovs.
3. Yog tej yam kev tso cai, ib tug repeater kuj tseem tuaj yeem muab ntxiv los txhim kho lub teeb liab lub zog thiab ua kom qhov sib kis tau zoo. Lub repeater tuaj yeem kho tau ntawm qhov chaw siab lossis ntawm lub ru tsev ntawm lub tsheb txav.
Yuav ua li cas sib sau ua ke lub wireless video transmitter, lub koob yees duab, thiab roj teeb?
Thov xyuas daim duab hauv qab no. 
Muaj ob lub zog txuas ntawm lub transmitter, liab connector yog 12V tso zis rau lub koob yees duab, thiab dub connector yog 12V input.
Dab tsi yog qhov lag lossis qeeb hauv milliseconds ntawm koj COFDM-912T?
200-300ms nrog lub koob yees duab tsis tu ncua thiab saib xyuas.
Lub koob yees duab ib txwm thiab lub vijtsam muaj qhov ncua sij hawm ntawm 200 milliseconds, txoj cai?
Nrog peb 100 milliseconds, nws yog hais txog 300 rau 400.
Peb kuj muaj ib tug nrog 30 milliseconds, tab sis tus nqi yog 6 lub sij hawm ntawd
300 milliseconds tau txais yog tias koj lub dav hlau muaj qhov tsis siv neeg tiv thaiv kev ua haujlwm.
Kuv sau koj lub transmitter tuaj yeem txhawb nqa mus txog 30 km hauv LOS. Nws yuav txhawb nqa deb npaum li cas hauv NLOs ib puag ncig?
Nws yog ib qho nyuaj rau hais qhov ntau yam ntawm kev siv tsis-kab-ntawm-pob ntseg, nws nyob ntawm seb muaj pes tsawg obstacles nyob nruab nrab. Nws yog ib qho nyuaj rau kis yog tias tag nrho cov hlau los yog roob thaiv nws.
Qhov kev xeem ib puag ncig yog tshwj xeeb, thiab qhov kev ncua deb tau los ntawm qhov kev xeem kuj txawv. Peb tsis tuaj yeem ua ib qho kev lees paub lossis kev cog lus txog qhov no.
Peb yog ib lub tuam txhab uas muab kev daws teeb meem rau qee qhov chaw nyob deb nroog ntawm no hauv Philippines los saib xyuas lawv cov dej ntws. Yog tias peb yuav 2W(30km) in the NLOS, nws tuaj yeem txo mus rau 20 km lossis ntau dua?
Nws yog ib qho nyuaj hais, nws yuav tsum nyob ntawm cov teeb meem ntawm lub transmitter thiab receiver. Peb tsis kuaj nws hauv koj qhov chaw siv, Yog li kuv tsis tuaj yeem qhia koj.
Tib yam khoom yuav raug cuam tshuam nrog qhov sib txawv ntawm qhov chaw sib txawv, thiab qhov kis tau tus mob nyob deb yog nyuaj hais. Tsuas yog qhov kev sim tiag tiag thiaj paub.
Tus neeg yuav khoom: Tiag tiag, peb tau teeb tsa lub xov tooj cua transceiver uas sib sau cov ntaub ntawv sensor thiab xa nws cov ntaub ntawv mus rau 18km deb ntawm qhov chaw hais kom ua. Kev ua haujlwm yog du thiab ok.
Tib qhov chaw peb yuav muab cov cuab yeej uas peb yuav yuav los ntawm koj.
Raws li koj tau hais, tsuas yog ib qho kev xeem tiag tiag yuav teb tag nrho kuv cov lus nug.
Tau COFDM-912T TX ntaus ntawv tso tawm cov ntaub ntawv sib cais?
Cov ntaub ntawv tsuas yog kis tau nyob rau hauv ib qho kev taw qhia los ntawm lub transmitter mus rau lub receiver.
Yog tias koj xav tau xa cov ntaub ntawv hauv ob qho tib si, koj yuav tsum tau ntxiv ib xov tooj cua digital telemetry. (wireless cov ntaub ntawv transceiver).
Kuv xav paub yog tias lub transmitter tseem tuaj yeem tso tawm cov ntaub ntawv serial ntawm lub koob yees duab yog dab tsi. Lwm yam tshaj li RF puas nws muaj cais rs232 tso zis rau lub transmitter?
Yog, COFDM-912T txhawb kev xa cov ntaub ntawv serial rau koj. Thov xyuas daim duab hauv qab no. 
Hauv no module qhov twg kuv tuaj yeem tso lub koob yees duab? Hom koob yees duab zoo li cas rau cov cuab yeej no?
Qhov dub nyob rau sab laug qhia me ntsis ntawm daim duab saum toj no, uas txuas nrog lub koob yees duab.
Nws txhawb nqa 720p CVBS composite AV lub koob yees duab. lossis ib lub koob yees duab HDMI los ntawm HDMI rau AV converter lub thawv.
Kuv tuaj yeem cia qhov kev sib kis tau zoo li cas yog tias kuv tshem tawm cov ntawv qhia zaub mov thiab vaj huam sib luag ntawm lub receiver?
Puas muaj ib txoj hauv kev los lov tes taw tswj vaj huam sib luag kom lub receiver tuaj yeem pom cov vis dis aus los ntawm transmitter?
Yog tias kuv tshem tawm cov tswj vaj huam sib luag ntawm lub receiver, tus receiver tsis pom lub teeb liab ntawm lub transmitter.
teb: Thov xyuas cov FAQ hauv qhov txuas hauv qab no.
https://ivcan.com/p/cofdm-video-transmitter-receiver-av-in-hdmi-out/#accordion-item-6._i_have_changed_the_parameter_on_the_configure_board_tool,_why_it_is_not_saving_when_i_restart?
Kuv twv tias koj tsis tau txuag qhov zaus, tom qab koj tshem tawm cov ntawv qhia zaub mov ntawm lub receiver, lub kaw lus yuav rov qab mus rau lub neej ntawd zaus ntawm 340Mhz. Yog li koj tsis tuaj yeem tau txais lub teeb liab.
Yog GPS thiab TX cais tsawg dua 1 'meter' – GPS yog jammed. COFDM-912T muaj suab nrov hauv GPS l1 thiab l2 zaus. Koj puas muaj cov lim dej qis los daws qhov teeb meem no?
Nyob zoo! Peb tau sim ntau yam ua ntej xaj ib pawg loj dua. Thiab ntsib teeb meem yog sib txuas COFDM-912T transmitter nrog GPS.
teb:
1. Yog koj yuav nws dua, Kuv tuaj yeem ntxiv cov lim lim qis hauv lub transmitter hauv dawb. Kuv kuj tseem tuaj yeem muab cov lim lim sab nraud rau koj dawb.
2. “Koj puas paub tias qhov poob qis hauv qhov tsis lim dej ntau npaum li cas?”, teb: max 0.6 db
3. “Koj puas paub dab tsi dBm poob yog dhau zaus?” 0.4dBm
COFDM-912T Customize Development
2 Watts default 595Mhz nrog 1.8-meter transmitter thiab receiver kav hlau txais xov
Tus neeg thov tau hais rau peb tias nws cov ntaub ntawv thov, transmitter thiab receiver, ob leeg siv rau hauv av. Txhawm rau txhim kho lub wireless kis tau tus mob nyob deb thiab zam lwm yam teeb liab cuam tshuam, Kuv pom zoo tias ob lub transmitter thiab receiver antennas siv 1.8-meter fiberglass kav hlau txais xov.
Nws yog thawj zaug uas tus neeg siv khoom coj tus qauv rau kev sim, yog li nws siv lub neej ntawd ob-watt amplifier thiab 595 MHz zaus.
Tus neeg siv khoom xav kom lub transmitter muaj HDMI tso zis kom nws thiaj li xa tau cov yeeb yaj duab tau txais mus rau lwm yam khoom siv. Tib lub sijhawm, txhawm rau txhawb HDMI cov tswv yim, Kuv kuj tau phim lub HDMI rau CVBS RCA AV converter lub thawv.
Cov neeg siv khoom tau ntxiv ib qho kev xaiv parameter hloov cov cuab yeej, Lub luag haujlwm tseem ceeb ntawm uas yog hloov kho lub transmitter kis zaus thiab impedance. Koj tseem tuaj yeem ntxiv tus password rau lub wirelessly kis video los encrypt cov yees duab ntawm lub transmitter. We must enter the same password on the receiver to decode the video to improve the security of the video.
Hloov COFDM Transmitter rau 200 mW TSIS, nrog lub zog hloov ntawm lub kiv cua txias rau lub cev hnav
Customize video on-off hloov ntawm COFDM Transmitter rau lub suab nkaus xwb wireless hloov.
Here is the test video for this client’s requirement, added a video on-off switch at the 10-watt PA wireless video transmitter to transfer the audio only.
Here is a video to show you that we can add one video on-off switch on the COFDM wireless video audio transmitter.
Video on, then the transmitter will transfer the video and audio at the same time.
Video off, then the transmitter will transfer the audio only.
Yog tias koj muaj ib qhov project lossis xav tau kho qhov ua haujlwm ntawm wireless video transmitter thiab receiver, thov hu rau peb.
Lub neej ntawd lub hwj chim amplifier yog 2-watt, peb kuj ua 10-watt PA sab hauv, los txhawb kev ntev-ntev thiab hloov mus ntev dua.
2 Watts default 595Mhz nrog Yagi Directional Kav hlau txais xov thiab Omnidirectional kav hlau txais xov
300 Watts fais fab amplifier hloov 230Mhz COFDM wireless video transmitter thiab receiver
FAQs
- Yog, Qhov ntau zaus tuaj yeem hloov pauv ntawm 170Mhz (zoo los ntawm 220Mhz) rau 860mhz. Yog li nws tuaj yeem ua haujlwm zoo ntawm 260Mhz band.
- Qhov zaus yuav tsum tau hloov mus rau tib yam ntawm lub transmitter thiab receiver. Yog vim li cas, Lub hwj chim Amplifier thiab kav hlau txais xov zaus yuav tsum hloov kho tib zaus. (Koj yuav tsum tau yuav lub hwj chim amplifier thiab kav hlau txais xov rau lub transmitter thiab receiver kom tau raws li koj qhov kev hloov zaus).
- Txhawm rau txhim kho qhov rhiab heev ntawm kev xa tawm thiab tau txais, qhov zaus bandwidth feem ntau ua nqaim heev (nruab nrab zaus ±15Mhz, yog li bandwidth yuav tsum yog 30Mhz). Lub hwj chim amplifier ntawm lub transmitter thiab zaus ntawm lub kav hlau txais xov yog tshwj xeeb customized raws li qhov zaus koj xav tau.
- Nws yog qhov zoo tshaj thaum koj tso qhov kev txiav txim, thov qhia rau kuv seb koj xav tau dab tsi ua haujlwm zaus. Peb cov engineers yuav hloov qhov zaus ntawm lub transmitter thiab receiver, thiab kuj hloov kho PA thiab kev cai kav hlau txais xov raws li qhov ntau zaus no los xyuas kom meej qhov zoo tshaj plaws rhiab heev thiab txhawb qhov ntev tshaj qhov sib kis.
- Lub neej ntawd zaus yog 590Mhz, Nrog 30Mhz (+/-15Mhz), koj tuaj yeem hloov nws yam tsis tau hloov kho lub hwj chim Amplifier thiab kav hlau txais xov. Piv txwv li, 578Mhz, 584Mhz, 590Mhz, 596Mhz, thiab 602Mhz.
- Yog hais tias koj yuav tsum tau hloov lub transmitter zaus thiab bandwidth, koj xav tau ib lub cuab yeej tshwj xeeb ntawm parameter configure board, thov saib daim duab hauv qab no, nws tsis yog ib tug default accessory, thov yuav nws ntawm tus nqi ntxiv lossis tiv tauj peb ua ntej xaj.
Yog, nws txhawb xa cov video thiab UART cov ntaub ntawv los ntawm transmitter thiab receiver.
Raws li nws yog ib txoj kev kis tau tus mob, yog li nws tsis tuaj yeem xa cov lus txib los ntawm lub receiver mus rau lub transmitter.
Yog tias koj xav tau xa cov lus txib lossis lwm cov ntaub ntawv los ntawm lub receiver los tswj lwm yam khoom siv xws li lub koob yees duab lossis drones ntawm lub transmitter., koj tuaj yeem ntxiv cov khoom pheej yig digital kis tau tus mob, hu rau peb, thiab peb tuaj yeem kho nws rau koj.
Thov xyuas UART txhais ntawm lub transmitter thiab receiver ntawm qhov txuas hauv qab no. Thov qhia rau kuv yog tias koj xav tau cov kab hlau lead. (default yog tsis muaj)
Lub transmitter default Power Amplifier yog 2 Watts, yog li nws tuaj yeem txhawb nqa 30 KM ntawm kab ntawm qhov pom.
Daim duab hauv qab no yog peb qhov kev sim deb ntawm lub roob mus rau ntug hiav txwv.
Yog tias koj xav xa cov kab ntev dua, koj tuaj yeem nce lub zog amplifier. Ntxiv rau ib watt thiab ob watts, peb kuj tuaj yeem ua tau 5 watts, 10 watts, thiab 20 watts rau koj xaiv. Cov amplifiers loj dua kuj xav tau cov roj teeb loj dua thiab kev txhawb nqa tam sim no.
Rau 20W PA, Lub hwj chim yuav tsum yog 24 ~ 28V. Tsuas yog ntawm 28 volts tuaj yeem ua lub zog amplifier ua tiav qhov kev ua haujlwm zoo tshaj plaws.
Peb tus engineer tuaj yeem hloov qhov zaus mus rau 300Mhz los ntawm lub neej ntawd 590Mhz, Lub kav hlau txais xov, thiab PA hauv warehouse yog 590Mhz, 300Mhz xav tau ob lub lis piam los kho, yog li lub sijhawm xa khoom xav tau ntev dua li peb lub neej ntawd 590Mhz.
Kauj ruam 1: Thov nias OK thiab khawm sab xis tib lub sijhawm, cov ntawv qhia zaub mov seb puas yuav txuag tau tshwm ntawm qhov screen.
Kauj ruam 2: Thov nias OK kom xaiv Yog los cawm.
Nco ntsoov, thov siv tus kav hlau txais xov loj lossis ntev dua yog tias koj qhov project tso cai, nws tuaj yeem tau txais kev txais tos zoo dua hauv qhov loj dua.
Cov txheej txheem tag nrho
- SD Transmitter ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W xaiv tau raws li koj qhov kev thov)
- SD Transmitter kav hlau txais xov
- HDMI CVBS tso zis receiver nrog parameter tswj zaub mov thiab lub vijtsam me
- 0.8-meter receiver kav hlau txais xov 1 pcs. (Muaj ob hom kev txhim kho lossis kho lub kav hlau txais xov: 1. magnetic sucker puag kav hlau txais xov, 2. default U-type clamp FRP fiberglass kav hlau txais xov )
- yeem, parameter configuration board rau lub wireless video transmitter.
(Yog hais tias koj xav tau ib tug magnetic sucker puag kav hlau txais xov, tus nthuav qhia lossis cov neeg nqa khoom xav tias cov khoom sib nqus yuav cuam tshuam rau lawv lub dav hlau kev nyab xeeb, yog li tus nqi thauj khoom yog siab dua li U-hom clamp kav hlau txais xov. )
Lub default tag nrho set pob dimension
- 84*21*12CM
- Qhov hnyav tag nrho 4.5KG
- Yog tias koj xaiv tshaj 100cm kav hlau txais xov thiab sib nqus nqus lub hauv paus kav hlau txais xov, Qee tus neeg xa khoom thauj khoom yuav them tus nqi ntxiv, xws li cov nqi ncua ntev thiab cov nqi ntxiv rau cov khoom sib nqus muaj zog.
- Lub transmitter parameter configures board yog txawv los ntawm ib tug nyob rau hauv lub receiver. Lub firmware ntawm lub parameter configure board txawv ntawm lub transmitter thiab receiver, lawv tsis tuaj yeem siv sib hloov.
- Lub transmitter parameter configures board tuaj yeem kho lub teeb liab attenuation ntawm lub transmitter. Ib 0.3db yuav txo qhov 0.5W PA.
Lo lus nug: Nws puas tuaj yeem hloov lub zog tawm (internal PA 0,5 w, 1 w, 2 w) ntawm lub rooj tsavxwm configuration?
- Raws li teb saum toj no, koj tuaj yeem kho lub zog tso zis los ntawm kev teeb tsa qhov tsis muaj ntawm ATTEN los ntawm qhov ntsuas qhov ntsuas qhov ntsuas lub cuab yeej ntawm lub transmitter.. (Cov cuab yeej no tsis suav nrog lub neej ntawd pob, koj yuav tsum tau ceeb toom tias koj xav kom muaj cov cuab yeej no thaum koj xaj)
- Yog tias koj yuav 2W PA, ces koj tuaj yeem teem nws 0.5W, 1W, tab sis tsis tuaj yeem hloov mus rau 5W.
- Peb kuj tuaj yeem ua rau 5W, 10W, 20W, thiab 50W yog tias koj xav tau kev txhawb nqa ntev.
tsis.
Lub wireless video transmitter no tsuas yog txhawb nqa CVBS lub koob yees duab lossis yees duab tawm tswv yim, lwm hom yees duab yees xav tau ib lub thawv converter ntxiv.
tsis. Nws yog COFDM (DVB-T) technology.
Yog li COFDM zaus ntau yog 170-860Mhz. Nws tuaj yeem txhawb nqa 477, 610, 675, 724, 816Mhz, tab sis tsis tuaj yeem txhawb nqa 970, 1180, 1230 Mhz.
Peb tus qauv tshwj xeeb transmitter tuaj yeem txhawb nqa txhua qhov saum toj no, tab sis tus txais yuav tsum tau siv lub downconverter thaiv.
Yuav kom tso cai rau peb lub wireless kis tau tus mob los txhawb ntau qhov dav thiab zoo dua lub teeb liab zog, peb feem ntau teeb tsa qhov kev khiav hauj lwm zaus mus rau ib qho chaw (170~ 860Mhz), thiab nws cov kev txhawb nqa tsuas yog ntxiv lossis rho tawm 15Mhz. Piv txwv li, Qhov nruab nrab zaus yog 590Mhz, max txhawb ntau zaus yuav tsum yog 575Mhz ~ 605Mhz, PA thiab kav hlau txais xov tshwj xeeb yog kho raws li qhov chaw nruab nrab no.
Yuav ua li cas ntxiv ib qho qis-pass lim nti rau lub transmitter?
Qee cov neeg siv khoom tau tshaj tawm tias thaum qhov kev ncua deb ntawm peb lub transmitter thiab GPS kav hlau txais xov tsawg dua ib meter, lub transmitter yuav cuam tshuam nrog kev ua haujlwm ntawm GPS los ntawm kev xa xov tooj cua.
GPS satellite teeb liab tau muab faib ua L1 thiab L2, nrog zaus ntawm 1575.42MHZ thiab 1228MHZ feem. Peb transmitter zaus yog 595Mhz los ntawm lub neej ntawd. Yog peb ntsib qhov teeb meem no, peb tuaj yeem txiav txim siab ntxiv qhov lim qis qis, uas txhais tau tias zaus qis dua 600Mhz. Frequencies saum toj no 600 MHz tuaj yeem raug tshem tawm kom tsis txhob cuam tshuam nrog lwm yam khoom siv hluav taws xob.
Muaj ob txoj hauv kev ntxiv cov lim. Ib qho yog ntxiv cov lim IC rau COFDM-912T transmitter board, thiab lwm qhov yog ntxiv lub thawv lim sab nraum lub transmitter. Cov lim dej down-pass tuaj yeem txwv cov zaus hauv qab ib qho chaw zaus, thiab cov lim dej nthwv dej tuaj yeem cuam tshuam cov zaus hauv qab ntawm qee qhov zaus los ntawm kev tso cai rau lawv hla.
