Hello Alex. Thanks for your reply.
>From the omnidirectional gain antenna of 5 dBi in each case mote TelosB (Rssi Base and Sending Mote ) Probably, the Line loss is very high? but it seems to be little credible, because in each case it will be -6.5 dB (impossible no?) PTx - Ltx+ Gtx+Grx-Lrx= 0dBm - 6.5dB + 5 dBi + 5dBi - 6.5dB = -3dBm ???? Alex CP. CUC On Tue, May 12, 2015 at 2:31 PM, Alexander <axel2...@mail.ru> wrote: > Hello Alex, > Where you got GainTx and GainRx from? > > Regards, Alex. > > 12 мая 2015 г., в 22:07, Alex Cp <cpa9...@gmail.com> написал(а): > > Dear Jobish John. > > You know the reason about why the measure of the Rssi in the Base is > -3dBm, because after make a link budget calculus it should be: 10 dBm when > the two antennas are touching? > > > Ptx+GainTx+GainRx= > 0dBm+5dBi+5dBi= > 10dBm > > Nevertheless the currently value obtained is -3dBm (The maximum value > obtained in terms of wireless power) > > Thanks in advance for your kind answer. > > > Alex CP > CUC. > > > > > > On Sat, May 9, 2015 at 2:00 PM, < > tinyos-help-requ...@millennium.berkeley.edu> wrote: > >> Send Tinyos-help mailing list submissions to >> tinyos-help@millennium.berkeley.edu >> >> To subscribe or unsubscribe via the World Wide Web, visit >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> or, via email, send a message with subject or body 'help' to >> tinyos-help-requ...@millennium.berkeley.edu >> >> You can reach the person managing the list at >> tinyos-help-ow...@millennium.berkeley.edu >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Tinyos-help digest..." >> >> >> Today's Topics: >> >> 1. Re: Rssi convert to dBm in TelosB (Alex Cp) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sat, 9 May 2015 12:45:00 -0500 >> From: Alex Cp <cpa9...@gmail.com> >> Subject: Re: [Tinyos-help] Rssi convert to dBm in TelosB >> To: tinyos-help <tinyos-help@millennium.berkeley.edu> >> Cc: ketan patel <ashok256...@gmail.com> >> Message-ID: >> <CAJk1sZ= >> jilo-oukvz7ol5ua1ayh+y3ae-e6pneb0w0ukzdk...@mail.gmail.com> >> Content-Type: text/plain; charset="utf-8" >> >> Dear Jobish Jhon and Alexander. >> >> Thanks a lot for all advices. Currently are worked fine, and the best is >> the fact that I know the calculus is very trustworthy (accurate >> information >> Jobish Jhon). >> >> Finally the file RssiDemo.java is now: >> >> ... >> int source = message.getSerialPacket().get_header_src(); >> double rssi = msg.get_rssi()-45; >> System.out.println("Rssi Message received from node " + source + >> ": Rssi = " + rssi + " " + "dBm"); >> } >> ... >> >> And mantaining the two TelosB motes very, very close (touching its >> antennas) I've obtained: >> >> Rssi Message received from node 1: Rssi = -4.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -4.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> Rssi Message received from node 1: Rssi = -3.0 dBm >> >> Thanks a lot again!! >> >> Alex CP >> CUC >> >> >> On Sat, May 9, 2015 at 2:14 AM, JOBISH JOHN <jobishjohn.m...@gmail.com> >> wrote: >> >> > Hi Alex, >> > >> > The datasheet (Page No: 11) of CC2420 says ? The range for RSSI is >> > approximately from ?100 dBm to 0 dBm ?. Page No: 49 of CC2420 datasheet >> > talks about substracting the offset value, -45 to get the dBm >> equivalent. >> > Page No: 10 of datasheet talks about the Receiver Sensitivity (Typ: -95 >> > dBm). >> > >> > Your previous readings shows approx. 0 dBm (when both the motes placed >> > very close) >> > >> > Try to increase the distance between the motes. When they get >> > disconnected, the Rssi Message received on your PC will be close to -50 >> ( >> > so that -50 -45 = -95dBm) ( I am getting this value). >> > >> > Thus I believe subtracting -45 is enough. >> > >> > Thanks >> > >> > Jobish John >> > >> > >> > >> > >> > >> > On Sat, May 9, 2015 at 10:37 AM, Alex Cp <cpa9...@gmail.com> wrote: >> > >> >> Hi all. >> >> >> >> Im trying to convert in dBm the values obtained from the app: >> >> >> >> <http://tinyos.stanford.edu/tinyos-wiki/index.php/Rssi_Demo> >> >> >> >> In my case appears the next values: >> >> >> >> Rssi Message received from node 1: Rssi = 40 >> >> Rssi Message received from node 1: Rssi = 41 >> >> Rssi Message received from node 1: Rssi = 40 >> >> Rssi Message received from node 1: Rssi = 40 >> >> Rssi Message received from node 1: Rssi = 41 >> >> >> >> Because is very close both motes TelosB (Sending Mote and Rssi Base ) >> >> >> >> In the TinyOS tutorial appears the next: "...that this app prints only >> >> the raw RSSI values ..." >> >> >> >> On the other hand I have the Data sheet of the RF Transceiver CC2420: >> >> >> >> <http://web.stanford.edu/class/cs244e/papers/cc2420.pdf> >> >> >> >> But is not clear to me How I can do the conversion from raw RSSI to >> dBm. >> >> >> >> >> >> I read, someone in the TinyOS mail-list, who wrote that is only >> necessary >> >> substract -45: >> >> >> >> < >> >> >> https://www.millennium.berkeley.edu/pipermail/tinyos-help/2014-March/058162.html >> >> > >> >> >> >> But I suppose is not a exact calculation. >> >> >> >> I'll be grateful if somebody can generously explain how is the correct >> >> way to convert raw RSSI values from a TelosB to a dBm. >> >> >> >> Thanks in advance. >> >> >> >> Alex. >> >> >> >> >> >> Date: Mon, 3 Mar 2014 12:13:27 +0530 >> >> From: ashok <ashok256...@gmail.com> >> >> Subject: [Tinyos-help] RSSI DEMO >> >> To: tinyos-help@millennium.berkeley.edu >> >> Message-ID: >> >> <CAKs3p-d4GxW_dJjVc9Hwmk-+X_ZKi+hnvzCr+C2TS2NkuKg4uA@mail. >> >> gmail.com> >> >> Content-Type: text/plain; charset="iso-8859-1" >> >> >> >> Dear All, >> >> >> >> I am getting RSSI value in tinyos like: >> >> >> >> Rssi Message received from node 1: Rssi = -14 >> >> Rssi Message received from node 1: Rssi = -1 >> >> Rssi Message received from node 1: Rssi = 2 >> >> Rssi Message received from node 1: Rssi = -2 >> >> Rssi Message received from node 1: Rssi = 2 >> >> Rssi Message received from node 1: Rssi = 0 >> >> Rssi Message received from node 1: Rssi = -2 >> >> Rssi Message received from node 1: Rssi = 2 >> >> Rssi Message received from node 1: Rssi = 2 >> >> >> >> and I want to conform that is this value is in Dbm? >> >> >> >> if not than how can i convert it? >> >> >> >> regards, >> >> >> >> -ashok >> >> >> >> _______________________________________________ >> >> Tinyos-help mailing list >> >> Tinyos-help@millennium.berkeley.edu >> >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> > >> > >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> https://www.millennium.berkeley.edu/pipermail/tinyos-help/attachments/20150509/3814e7ec/attachment-0001.htm >> >> ------------------------------ >> >> _______________________________________________ >> Tinyos-help mailing list >> Tinyos-help@millennium.berkeley.edu >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> End of Tinyos-help Digest, Vol 145, Issue 8 >> ******************************************* >> > > >
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