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433Mhz (or 866Mhz) Video transmission, what modulation? 64QAM? MASK?

Hi


For a drone developpement we would like to transmit video, we already have done experiment with 2.4GHz which is fine for drone control but not for video over long range (tartget being 1 -2Km), At 1Km distance 2.4GHz bitrate is 250Kbps at 100mW emission (max power from law).

433Mhz would allow >2km but the <2MHz bandwith does not gives enough datarate with ASK (OOK) or FSK modulation (as it seems nobody have done QAM on 433 and similar band). If using QAM modulation (or even MASK) we could reach 4Mbps easily on these 2Mhz bandwith (on 433Mhz).

Our problem is that no solution (TI or other) seems to be available to transmit digital video over 433 / 866 / (3xx in other country ) MHz.

It was a time with analog TV were such solution were existing for indoor on 443 and similar Band (but i suspect at this time QAM was  not existing).

I expect this thread to gives some insight on how would you do or existing solution to transmit video (~4Mbps) on sub gigahertz band with respect to the law of course.

Regards

  • I'm not sure we can advise you to well. It seems you need a video source, I presume it will be a digital source, then you need to encode that to some video standard using some CODEC to a bitstream, this could be running in some processor/FPGA/CPLD, then encode that data in some modulation scheme which can be sent to a digital to analog converter for transmission at allowable rates/bandwidth for the bit-stream rate and allowable power levels for range. Of course adhering to any other spectral emission rules for where you are transmitting, provided it allows that usage.

    It seems we have chips which have some video CODECs on them.
    www.ti.com/.../c66xcodecs

    And we have digital to analog converters, we also clocking devices which could drive the system/converters and have PLL synthesizers for mixing your output with for transmission, but that's about all I can say to help.

    73,
    Timothy