Hi John, Our nodes use a CC1101 at 868 MHz, which should be quite similar to 915 MHz. I don't think we've used a folded dipole, though. If I'm not mistaken, we usually use a monopole or inverted F antenna on the PBC, or a chip antenna if space is an issue. Michiel
> -----Original Message----- > From: [email protected] [mailto:tinyos-help- > [email protected]] On Behalf Of John Griessen > Sent: Sunday, September 30, 2012 22:44 > To: [email protected] > Subject: [Tinyos-help] low power, good range,sub GHz transceivers with > tinyos > > I'm going to be making some tinyos nodes for field biologists using > the old telosb design slightly modified, but after that batch, > I'd like to make something better for frequencies like the CC1101 > transceivers use: > 315, 433, 868, and 915 MHz. A few years ago David Moss emailed this > list often with > talk about using those frequencies, but I don't see him talking lately, > is anyone else using > 433 or 915 MHz bands for tinyos? I'd like to know if so. I'm > wondering how difficult the testing > and all for a folded dipole for 433 or 915 MHz is and what is out there > already. > > In reading about antennas, I like the folded dipole as used on CC2500 > reference designs since > it is matched to the transceiver output impedance so you don't need a > balun circuit and have > fewer parts and inherent good coupling to the antenna for true low > power. So, another question > I have is, "Is there an open platform based on the cc2500, and if so, > it probably uses a MSP430 > for the tinyos code rather than the internal 8051 MCU of the CC2500, > and if so, which one? > > The msp430f5438A platform mm5t, (https://github.com/MamMark/mm.git), > mentions using > the CC2420, which costs 2X as much as a CC2500, and doesn't have a > folded dipole ref design, > so not as desirable... > > > John Griessen > -- > Ecosensory _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
