10 thoughts on “Long range R/C on 868Mhz

  1. That’s _nice_!

    I’d like to use something like that with a wheeled ROV but real time video over those kinds of distances over the ground…ouch. :(

    This is an awesome project.

  2. cool. i know the 900mhz band is mostly open/unlicensed (cordless phones, etc). but 868mhz i dont know much about.

  3. 900 Mhz is licensed but for low power stuff (like a cordless phone or other r/c devices) you dont need one. For the things he is talking about you do need a HAM radio license in the states.
    “The receivers of 11 series of 868/902Mhz are designed for the band ISM of 868-870Mhz of agreement to the European procedure ETSI EN 300 220 and availables for the band ISM 902-928Mhz in agreement with the procedure FCC of the USA.”

    902-928 is the 33cm band and should not be used without a license. If you are interested in getting one, check out the ARRL and QRZ websites, they will help you get your license. Its not very hard to get the basic one which is needed for this band (technician).

    I know he is talking about 868Mhz but it is not legal to use this in the states for any reasonable amount of power.

    Also, if you want more range, try a lower frequency. Once you’ve got your ham license you can use a huge range of them!

    http://www.arrl.org/FandES/field/regulations/bands.html

    http://www.qrz.com/

    Enjoy
    -Bill
    KC2RST

    PS If you are ever in the Newark NJ area listen for me on K2MFF, the repeater at NJIT.
    http://web.njit.edu/~k2mff/

  4. ya, lots of place online willing to sell you tx/rx equipment for 868mhz tho…

    from wikipedia:
    # 824–849 MHz: AMPS A & B franchises, terminal (mobile phone) (formerly TV channels 73–77)
    # 849–869 MHz: Public safety 2-way (fire, police, ambulance — formerly TV channels 77–80)
    # 869–894 MHz: AMPS A & B franchises, base station (formerly TV channels 80–83) (one translator is still in use on channel 83)
    # 902–928 MHz: ISM band: cordless phones and stereo, radio frequency identification, datalinks, amateur radio (33 cm band)
    # 928–960 MHz: Mixed studio-transmitter links, mobile 2-way, paging, other.

    from the ism page, it looks like AMPS spectrum has mostly been abandoned as of feb18 2008. maybe this will get auctioned or opened soon?

    “The receivers of 11 series of 868/902Mhz are designed for the band ISM of 868-870Mhz of agreement to the European procedure ETSI EN 300 220 and availables for the band ISM 902-928Mhz in agreement with the procedure FCC of the USA.”

    looks like the US version will only be 902-928mhz? and “changes for soft (setup)”??? maybe a software setting or jumper that changes it between bands? would 40mhz lower make much of a difference?

    been thinking about getting a ham license for ages now. last time i checked, the morse code requirement is gone for the tech class.

  5. Actually the 868 DMD system is under beta testing and they have flown ¡¡16.5Km away with an easy-star elapor plane !! , the actual limit is the plane battery capacity . They will have available the system in 2 versions , 868 Mhz for Europe ISM band ,and 900 for USA .For more info take a look here : http://www.dmd.es/rc_&_fpv_e.htm

  6. There is a cool set of tested protocols to broadcast digital over 12Mhz SW. I forget what they’re called though.

    There is almost -no- public implementation literature on them though.

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