HDMI Wireless Video Transmitter and Receiver COFDM-908T

Q. X'inhi r-riżoluzzjoni tal-vidjo?
A: HDMI 1080p.

Q. Il-kurrent tal-qawwa tat-trasmettitur huwa għoli?
A: Għal trasmettitur, il-PA differenti (amplifikatur tal-qawwa) ġewwa, il-kurrent huwa differenti. 20W 6-7A, 10W5A, 5W 3A, 1-2W 1.6A

Għal riċevitur, il-kurrent huwa biss 0.3A (300mA)

Q: Bħall għandna bżonn biss 10km, kemm PA huwa rakkomandat?
A: Meta wieħed iqis li t-trasmettitur u r-riċevitur tiegħek jintużaw fuq l-art, kuntrarjament għad-drones, l-għoli tat-trasmettitur u r-riċevitur huma differenti ħafna. Huwa rakkomandat li tuża trasmettitur PA 10W għal 10 kilometri. Trid tikkunsidra wkoll li r-riċevitur tiegħek huwa installat fuq il-karozza, u jibqa 'jiċċaqlaq b'veloċità għolja fi kwalunkwe ħin. Trasmettitur ta 'qawwa għolja biss jista' jiżgura l-istabbiltà tas-sinjal fir-riċevitur.

Q: Liema frekwenza hija aħjar? 2.4G jew 5.8G?
A: Il-firxa tal-frekwenza ta 'Cofdm hija 170 ~ 860Mhz.
Għandna wkoll prodotti li jużaw 2.4G jew 5.8G, iżda l-firxa ta 'dawn iż-żewġ intervalli hija l-istess bħall-frekwenza tal-WiFi, li se jikkawża li t-trażmissjoni tkun interferita ħafna mill-WiFi, u d-distanza tat-trasmissjoni se titqassar ħafna.
Jekk hemm sinjali tat-TV diġitali DVB-T lokalment, ipprova tevita frekwenzi f'dawn il-meded meta tagħżel frekwenzi.

Q: Jistgħu l-klijenti jaġġustaw il-frekwenza waħedhom? Jekk xi kultant il-frekwenza hija okkupata.
A: Il-frekwenza ċentrali default hija 595Mhz, ġeneralment hemm bandwidth +/-15Mhz, li huwa 30Mhz, u l-firxa tal-frekwenza tista 'tiġi aġġustata. (580-610Mhz).
Lil hinn minn din il-firxa, huwa meħtieġ li tinbidel l-antenna u l-PA apposta skont din il-frekwenza taċ-ċentru.

Q:Kif il-klijent jaġġusta l-frekwenza tat-trasmettitur jew riċevitur? Hemm xi softwer biex tinbidel il-frekwenza?
A:It's very easy, it-trasmettitur jista 'juża l-bord tal-assistent ħdejn l-istampa, and the receiver's assistant board is on the fuselage, bi skrin u buttuni.

Iżda mhuwiex rakkomandat li l-klijenti jaġġustaw, għax xi drabi huwa biddel il-parametri tat-trasmettitur iżda ma biddilx il-parametri tar-riċevitur, qal li ma setax jirċievi s-sinjal.

Q: Nista 'naġġusta l-amplifikatur tal-qawwa fuq it-trasmettitur?
A: L-utent jista 'jnaqqas il-qawwa attwali tal-ħruġ billi jżid l-impedenza tal-qawwa għolja, iżda ma tistax iżid it-trasmettitur tal-PA ta 'enerġija baxxa.
Pereżempju, 10W PA jista' jinbidel għal 5W PA, iżda ma tistax tbiddel 5W PA għal 10W.

1. Ħadd ma jista 'jgħidlek id-distanza eżatta tat-trasmissjoni. Minħabba li d-distanza tat-trażmissjoni tiddependi fuq l-għoli tal-antenna tat-transceiver tiegħek u t-tip u l-ħxuna tal-ostakli, jekk is-sinjal trażmess jistax jiġi diffrattat, jekk hemmx interferenza fil-frekwenza kurrenti, eċċ.
2. Hemm siġar jew muntanja fin-nofs, u d-distanza tat-trasmissjoni hija differenti.
3. Huwa diffiċli li tgħidlek distanza ta 'trasmissjoni preċiża, anke l-ħitan għandhom ħxuna, ġeneralment 500-1000 metru.
4. Jekk jogħġbok ara l-video tat-test tagħna, jekk taħseb li huwa adattat, tista 'tixtri kampjun għall-ittestjar, jekk m'intix sodisfatt, tista’ tirritornaha lilna.
5. Hawnhekk hawn formola għad-distanza tat-trażmissjoni COFDM PA u LOS u NLOS għar-referenzi tiegħek.

Issa COFDM-908T jappoġġja H.264, mhux H265.

Appoġġ massimu 1080 50P. Fil-fatt ittestjajna dak f'1080P60, il-qafas se jkun imwaħħal, jew ir-rikonoxximent ma jkunx komplut

1. Il-konsum tal-enerġija huwa ugwali għall-vultaġġ tal-ħinijiet tal-kurrent. Pereżempju, għal trasmettitur 10W, il-kurrent huwa 5.5A, u l-vultaġġ huwa 12V, għalhekk il-konsum tal-enerġija tiegħu huwa 66W.
2. Jekk tipprepara batterija rikarikabbli ta '1000W u tuża trasmettitur PA ta' 10W, huwa stmat li tista 'tuża 1000W diviż b'66W, li hija ugwali għal 15 sigħat.

1. Jekk ir-rabta bejn it-trasmettitur u r-riċevitur hijiex tajba jew is-saħħa tas-sinjal tista' tidher fuq l-iskrin żgħir fir-riċevitur COFDM.
2. Mhux fuq it-trasmettitur. Minħabba li COFDM hija trasmissjoni one-way, ir-riċevitur biss jista 'jirċievi s-saħħa tas-sinjal tat-trasmissjoni u jurihom fuq l-iskrin. Jekk it-trasmettitur jeħtieġ li jara dawn is-sinjali, huwa meħtieġ li jiżdied sett ta 'tagħmir ta' trażmissjoni tad-dejta biex jittrasferixxi s-sinjal tal-istatus mir-riċevitur għat-trasmettitur u jurihom bid-dawl tas-sinjal.
3. It-trasmettitur u r-riċevitur tat-trasmissjoni f'żewġ direzzjonijiet jista 'jkollhom din il-funzjoni, u huwa rakkomandat li tagħżel apparat ta 'trasmissjoni bidirezzjonali.

1. First of all the frequency is correct.
2. In order to achieve the best performance of the transmitter, power amplifier and antenna, they are generally customized according to a central operating frequency point, and they can all work within a working frequency range, generally ±15Mhz. That is to say, when the central operating frequency is 290Mhz, the working range of the transmitter is 275Mhz~305Mhz. So it meets the frequency range of 280~300Mhz required by customers.

1. Iva, the wireless video signal reception is improved by using Yagi and omni-directional antennas.

2. 

3. 

1. Iva, we can build the transmission of telemetry and video in COFDM-908T.

2. The below model of transmission of telemetry is recommended.

   https://ivcan.com/p/digital-data-link-for-drones-and-robotics/

   

1. L-ewwel, the 10-watt RF linear amplifier and the 20-watt RF linear amplifier use the same cavity, which is machined by a CNC mill.
2. CNC milling machines are not only expensive but also take a long time to process. The 20W and 10W cavities are universal, so they can be used with each other. For faster delivery, this character was not changed and used directly.
3. This product actually has 20 watts. We used special instruments to test it before shipment. Please see the video below. （The instrument shows 3.04dBm plus the black attenuator 40dBm equals 43.04dBm）
4. Test video at youtube: https://www.youtube.com/shorts/jfNoZeb1BIA
5. Here are some correspondences between the output power and the dBm parameters displayed by the instrument.
6. 20mW is 13dBm
   200mW is 23dBm
   1 Watts is 30dBm
   2 Watts is 33dBm
   5 Watts is 37dBm
   10 Watts is 40dBm
   20 Watts is 43dBm
   50 Watts is 47dBm
   100 Watts is 50dBm

Normal Four HDMI Video input and One HDMI output box

If it is just a simple splicing of four camera videos into one video, you can add a box with four HDMI inputs and one HDMI output in front of the transmitter. This means that the monitor on the receiver will always display each video on a quarter of the screen.

Iva, our dual antenna RF input receiver supports diversity. You can use two yagi directional antenna on our cofdm wireless video receiver.

For better signal reception, it is recommended to have one Yagi directional antenna and one omnidirectional antenna installed on the receiver.

It can be used by photographers. Currently supports 1080@60P, 1080Vidjo u Awdjo, 1080Vidjo u Awdjo
bħalissa, it does not support 1080i, nor does it support 4K transmission.