Discussions

HM-TRP 868 vs. 3DR Radio Config 0.9

Posted by Marcin Krawczyk on December 3, 2012 at 11:28am

"Homemade" HM-TRP 868 MHz identified as:

SiK 1.6 on HM-TRP

FREQ_868

In tool for Min Freq default value is 868000, for Max Freq is 869000, BUT in both dropdown lists I have:

902000

907500

915000

921000

928000

433050

434040

434790

435000

Is this correct?

PS. Same in Mission Planner...

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Replies

  • Hugh Hemington August 10, 2014 at 8:18pm

    I have the 915MHz radio from the RCTimer APM 2.5.2 kit, and it has a different range. Just load the default.  I see Mission Planner 2.0.14 no longer has an option to upgrade the 3DR radio firmware, or it just won't upgrade this one.

    How are people doing the upgrade to 1.9 now?  I'm on 1.6, and I don't think that will transmit data -- mine isn't anyway!

  • MHefny July 17, 2014 at 9:06pm

    I have a question .....  using a telemetry of 433 MHz can I change frequency to 900MHz  internally using firmware or this is a hardware feature ... the datasheet says that "Frequency range = 240–960 MHz"

    so are there variant of the IC itself for different frequency ranges or this is a single IC

    • MHefny > MHefny July 17, 2014 at 9:11pm

      I have just found this function in radio.c 

      set_frequency_registers

      EZRADIOPRO_HBSEL

      I believe this is the answer am I right

  • Cheng Lawrence July 4, 2013 at 7:19pm

    Greetings,

    When I inquiry the RSSI my HM-TRP868M using "AA FA 87", it shows 00.

    According to data sheet, this is > -100dbm.

    Is this normal?

    Lawrence

    • Hugh Hemington > Cheng Lawrence August 10, 2014 at 8:19pm

      That would be 1/2 watt!  That's a honking radio there.

      • Marcin Krawczyk > Hugh Hemington August 10, 2014 at 11:30pm

        Check your calculation again...

  • Developer
    Andrew Tridgell December 5, 2012 at 12:43pm

    Hi Marcin,

    I think you will need to use the AT interface in a terminal program to set the frequencies. The 3DR tool that Michael wrote is meant for the 3DR radios, which don't (yet!) come in a 868 variant.

    See the wiki page for information on the AT interface.

    Cheers, Tridge

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