[sdiy] presets on a modular

[Glen]

At 03:34 PM 11/11/04 , Richard Wentk wrote:

>>...or perhaps implement a wireless digital network
>
>Big issues with guaranteed bandwidth and delivery time there. And issues 
>with FCA and other certification if you try to roll your own protocol.
>
>If there's an off-the-shelf solution for wireless that's synchronous rather 
>than packet based, I'd like to know about it because it's exactly what I 
>need for my ever expanding laser controller.

Wireless doesn't always have to mean radio transmission. Could you perhaps
use a modulated IR link for your laser? I don't think the FCC regulates IR,
but I don't know about agencies of other countries.

There are also several frequency bands scattered throughout the spectrum
that are reserved for low-power non-licensed applications. I don't remember
all the technical details, but if you operated on one of those frequencies,
with low enough power, you might be able to use whatever modulation and
protocol you desired. There's also the remote control bands available to
amateur radio operators. Perhaps one of those frequencies could be pressed
into service? Of course, you would need an amateur license to transmit
anything on those frequencies. (It's not practical for most people, but it
possibly might be for someone on this list?)


take care,
Glen