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
