Simon wrote: > I find it hard to imagine both system > protocols working > harmoniously as the local field.
Why would they not work in harmony on the same field? Existing radios are on 72 Mhz. Existing SS radios use 900 Mhz and 2.4 Ghz. Are you assuming the powers that be might grant spread spectrum on the same 72 Mhz? > To be able to comment requires a firm > understanding > of the technology, bandwidth requirements versus numbers of > channels per > TX, and the fact it varies (protocol), effective range because the > carrier frequency (to get the bandwidth) would have to be at least a > magnitude higher than 72MHz. Does everyone "just turn on" ( actually > impossible), or does your TX use blue-tooth (eg: 802.11), and > a central > hub takes care of the communications protocol (which > one...FHS, DSS, how > about FSK or FDM). More B/W means a higher carrier, which equates to > less effective range. Theoretical maximum bandwidth is proportionol to center frequency. Classic channel theory. Range is primarily determined by radiated power. Smart radios can exchange bandwidth for power if required, by changing the amount of redundant information (error correction codes) transmitted. Sure range is affected by frequency, but with enough power that is easily overcome. Just look at TV satelites broadcasting 200 channels of video at the same time. > Go talk to the inovators using spread spectrum, you will > learn that not > only is their particular application limited by range, but also > bandwidth, and more importantly a protocol that is limited to > real-time > commands of a rate which is in the stone age compared to what we are > used to right now. Again. Power is their real limit (FCC), which in turn limits range and/or bandwidth, as you mentioned. Regards, Jon RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
