[Tinyos-help] Antenna gain on tmote

[Chang Li]

The height may be a factor. That is interesting. I tested it on the ground. My maximum distance in an open football field with PCB antenna is 25 meter ( 80 feet ?) that is similar result to 100 feet. In such a short distance the PCB antenna is not much helpful outdoor. Anybody knows the information of an amplifer with an external antenna? Can I connect a large external antenna like HDTV antenna on the mote?

-Chang   


  How high off the ground do you have the motes?  To get good transmission distances I would recommend to you that you place them at least 1 yard off the ground, 2 yards is even better.  I have done range testing with the standard antenna and some external antennas in an open hay field.  We had similar results to what you are getting when they are on the ground.

  Matt

  -----tinyos-help-bounces at Millennium.Berkeley.EDU wrote: -----


    To: Chang Li <changl at neatware.com>
    From: Matt Thompson <matt.thompson at lochisle.com>
    Sent by: tinyos-help-bounces at Millennium.Berkeley.EDU
    Date: 07/24/2006 05:26PM
    cc: tinyos-help at Millennium.Berkeley.EDU
    Subject: Re: [Tinyos-help] Antenna gain on tmote

    I have only had a max distance of 100 feet outdoor line of sight :(

    -Matt

    Chang Li wrote:
    > What is the maximum distance between two motes who can communicate 
    > outside by your chip antenna?
    >
    >> Hi,
    >>
    >> Does anyone know the dBi gain of the PCB antenna on the tmote sky 
    >> modules??  We have layed out a board with fractus 1dBi gain antennas, 
    >> and we're not getting close to the range of the tmote antennas.  
    >> Trying to figure out if this is due to lack of gain, or other 
    >> design/manufacturing issues (unmatched impedance).
    >>
    >> Cheers,
    >> Matt
    >> _______________________________________________
    >> Tinyos-help mailing list
    >> Tinyos-help at Millennium.Berkeley.EDU
    >> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
    >>
    >>

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