Interesting, the highest channel (26, which is the default in tinyos) should be on 2.48GHz. While I managed to communicate with motes on neighbouring channels (like on transmitting on 14 the other receiving on 15, 5MHz between them), but there shouldn't be anything above 2.48.
Your problem can be something completely different, but based on your description, it seems like everything is working between the mcu and the radio, so there's probably something between the transmitter and the receiver. - But I'm still just guessing. Andris On Thu, Mar 26, 2015 at 7:18 PM, jobishjohn ips <[email protected]> wrote: > Hi, > > Thanks for your valuable time. > > Its 2.4845GHz. The spectrum analyzer output for both the cases ( A > purchased telosb programmed as the transmitter and "test telosb" acting as > the transmitter) are attached. Request you to kindly have a look. > > Thanks > John J > > On Thu, Mar 26, 2015 at 11:20 PM, András Bíró <[email protected]> > wrote: > >> Hi, >> >> Are you sure it's 2.45GHz? It should be 2.48GHz (channel 26, 2.45 is >> channel 20) - that can be a problem. >> >> Andris >> >> On Thu, Mar 26, 2015 at 5:23 PM, jobishjohn ips <[email protected] >> > wrote: >> >>> Hi, >>> >>> Sorry for the inconvenience due to a lengthy mail. Requesting you to >>> spent 2 minutes on this issue. >>> >>> I have assembled a telosB board with the help of layout given in >>> http://www.tinyos.net/scoop/special/hardware to continue with my >>> research studies. >>> >>> Let me call this as “test telosb board”. I also have some other >>> working telosb boards which are purchased from a local distributor. >>> >>> The “test telosb” does not work either as transmitter or receiver. >>> Please give me some directions to debug this board. My trials as listed >>> below (I use tinyos 2.1.2 on Ubuntu). >>> >>> *Debugging method**1 * >>> >>> I have programmed one *purchased telosb as **transmitter* and the *“**test >>> telosb board” **as receiver**.* >>> >>> The transmitter is programmed to broadcast periodic AM messages. >>> >>> The receiver is programmed with the standard “Basestation” application. >>> But the receiver is not receiving any data. >>> >>> While debugging, I could find that the “SFD” pin of the cc2420 in the >>> test board is NOT going into active state (high) at all. >>> >>> The nesC program running on the transmitter & the receiver are tested >>> using purchased telosb boards. In this case everything works fine. >>> >>> *Debugging method2:* >>> >>> I have a *transmitter (test telosb board)* and a *receiver **(purchased >>> telosb**)*. >>> >>> Receiver is programmed with “Basesation” application. The transmitter is >>> programmed to broadcast some periodic AM messages. >>> >>> The nesC program running on the transmitter signals the event >>> “AMSend.sendDone” >>> with success. >>> >>> In this case , the “SFD pin ” works as expected (Fig 15 in cc2420 >>> data-sheet). Also I am able to measure a transmission power of approx. 0 >>> dBm around 2.45GHz band using a spectrum analyzer. >>> >>> But the receiver does not receive any data. >>> >>> Other than radio, everything works fine in the test telosb board. >>> >>> Thanks for your valuable time. >>> >>> Regards >>> >>> John J >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> >> >> >
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