HSMM High Speed Multimedia Radio

Discussion in 'VHF/UHF - 50Mhz and Beyond' started by KB3VWG, Aug 22, 2014.

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  1. KB3VWG

    KB3VWG Ham Member QRZ Page

    Has anyone begun experimenting with HSMM or transferring data over wireless at speeds faster than 56kbps?

    Has anyone done any successful data transfers with 420, 900, 2400 or 5800 MHz? Have you experimented with data on any other band?

    Is anyone using software/hardware other than Broadband-Hamnet and consumer routers?

    If so, do you provide connectivity to AMPRNet (www.ampr.org)?

    I currently have 2.4GHz nodes at my station, and I provide AMPRNet access and services on AMPRNet (e.g. whatismyip.ampr.org and an online tool to "recover" your APRS access code, and other services). My goal is to mesh across my county and eventually have a HSMM Mesh infrastructure in my section. There are many stations working on the effort in my area.

    I welcome your comments and experiences with HSMM.



    73,

    KB3VWG
     
  2. AA9G

    AA9G Premium Subscriber QRZ Page

    I have never heard of this. What exactly is this?
     
  3. WA6MHZ

    WA6MHZ Subscriber QRZ Page

    I have 2 LINKSYS routers configured for it, and they recognize each other, but haven't been able to transfer any data between them
     
  4. KB3VWG

    KB3VWG Ham Member QRZ Page

    High Speed Multimedia Radio, basically, is the use of wireless to transfer data at speeds faster than 56kbps.

    HSMM: https://en.wikipedia.org/wiki/High-speed_multimedia_radio
    AMPRNet: https://en.wikipedia.org/wiki/AMPRNet

    Connect one to the Internet by making a connection between your Internet router and the WAN port, plug a laptop into the other, then and see if you can reach the WWW. That's the easiest way to see if you're passing data.
     
  5. W6RZ

    W6RZ Premium Subscriber QRZ Page

    I'm experimenting with digital television, which is essentially a high rate data link. The hardware platform is one of the new "low-cost" transmit capable SDR's, bladeRF.

    http://nuand.com

    The software platform is Linux and GnuRadio. Myself and others have developed GnuRadio projects for almost all of the digital television formats in use today including ATSC, DVB-T, DVB-S, DVB-S2 and CATV 64-QAM. Bandwidth is typically 6 MHz, but larger and smaller bandwidths can be done with the DVB standards. Bit rates are in the 20 to 30 Mbps range, although higher bit rates are certainly possible (with DVB-S2, the hardware is capable of 89 Mbps in a 24 MHz wide signal).

    Although the digital television formats use 188 byte packets, it would be easy to encapsulate TCP/IP packets into the 188-byte format (in fact, this is exactly how DOCSIS cable modems work on the downlink). DVB-S2 is even more IP friendly with arbitrary encapsulation.

    To be honest, I've yet to do any over the air testing due to the low power output of the bladeRF (only 6 dBm peak). All testing to date has been done with direct connections to receivers through an attenuator. However, I'm in the process of acquiring a power amplifier for 70cm. The nice part of using 70cm is that cable ready TV's have tuners that work directly at 70cm. Cable channels 57, 58, 59, 60 and 61 all fall in the 70cm band. I've been testing on channel 58, which is centered on 429 MHz (426 to 432 MHz for a 6 MHz wide signal).

    The other band of interest is 23cm, since DVB-S and DVB-S2 receivers typically tune 950 to 2150 MHz.

    Here's a pic of the GnuRadio instrumentation while transmitting DVB-S2 with 8PSK modulation.

    [​IMG]


    DVB-S QPSK on a spectrum analyzer.

    [​IMG]

    Some links.

    DVB-T transmitter and receiver.

    https://github.com/BogdanDIA/gr-dvbt

    CATV 64-QAM transmitter.

    https://github.com/argilo/gr-qam

    DVB-S transmitter.

    https://github.com/drmpeg/gr-dvbs

    DVB-S2 transmitter.

    https://github.com/drmpeg/gr-dvbs2

    Yahoo digital amateur television group.

    https://groups.yahoo.com/neo/groups/DigitalATV/info
     
  6. W6OGC

    W6OGC Ham Member QRZ Page

    Pat:

    Get in touch with the guys in CERO across the bay. They have a system linking the hospital, ECC, the CERO repeater site at the top of Coronado Shores building, down to the Cays and I don't know where all these days.... the same guys that did that generator comparison down at your shop a few years back.
     
  7. KC2UGV

    KC2UGV Ham Member QRZ Page

    Yes, and in process of a Part 15 plan to cover as much of my city as possible with this network (Subject to change, still in formative stages).
     
  8. KB3VWG

    KB3VWG Ham Member QRZ Page

    Part 15...or Part 97?

    You know once you modify the antenna or amplify the power, you're no longer under Part 15 paramaters and you must follow Part 97 parameters on frequency, power, identification, etc.
     
  9. W7BDB

    W7BDB Premium Subscriber QRZ Page

    I have configured six units and have them all communicating with one another. I connected a IP camera to one of them and can view it from the other nodes. Several of us in this area are working on linking up but haven't brought it all together yet. There is another group working with a slightly different technology that has some potential too. https://www.hamwan.org/t/tiki-index.php The latest version 1.1.2 has had a few issues with the Linksys routers but they are working on a fix.

    73
    Bryant
    W7BDB
     
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