Greg, Give us a call. Best Regards David Huisman ----------------------------------------------------------------------- ORBIT COMMUNICATIONS Reliable Wireless Solutions (Telemetry, Control, Monitoring ...) Website : http://www.orbitcoms.com PO Box 3469 Tuggerah NSW 2259, AUSTRALIA Phone: 61-2-4393-3627 Fax : 61-2-4393-3685 Mobile: 61-413-715-986 ----- Original Message ----- From: "G Brigley" To: Sent: Sunday, May 12, 2002 8:02 AM Subject: [EE]: RF modules > Hi, > > I'm designing a network of devices that uses a shared wireless medium. > Messages will be sent to specific nodes using an address unique to each > device. Each node will also sense the presence and addresses of all other > devices within transmission range. I was going to do this by having each > device transmit an announcement at regular intervals (OK, somewhat > regular; I realize that I'll have to avoid collisions). > > I want to make the cost per node as low as possible, and requirements for > range and throughput are very low. (A few tens of metres and a few > hundred bps minimum). > > I was looking at transceivers using 315MHz and 433MHz frequencies costing > about $25 US in small quantities, which would be acceptable. I read > somewhere that unlicensed users of those frequencies are prohibited from > sending continuous data or regular periodic data. Would my application > violate those requirements? I get the impression that the 900MHz range is > less restricted, but those modules seem to be far more expensive. Can > anyone point me to the authoritative document that details the > limitations? I'm in Canada, but I expect that our regulations are similar > to those in the US. > > This is a student project, so certification for retail sale is not an > issue, but I'd like to avoid building something that is blatantly > illegal or harmful to others. > :) > > > Thanks in advance, > Greg > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > > > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.338 / Virus Database: 189 - Release Date: 14-Mar-02 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu