On 2011-05-01 21:07, Joseph Apuzzo wrote:
Well almost, the design in my head is like a modern WiFi router, but
with a tad bit more server.
We should just add a modem circuit to a router circuit and do it as
a Ethernet attach.
That's an interesting theory but the typical throughput you'd get at 30%
duty cycle half-duplex over AX.25 would likely be terrible.
Additionally, one of the things you need to keep in mind is that each
packet transmission MUST have the callsign of the ham transmitting
within the packet and use a standard packet protocol AFAIK. Thus, you
cannot simply "put ethernet over the radio" like I think you might be
thinking of. If you are I don't blame you, because I had that dream
once also.
But back to reality are there any projects that can take low cost
GMRS radios and deliver 9600bps-1mbs?
If not then can we get the right people together and propose something?
I sure between me you and Ed we can design something...
Right now I'd say 9600 baud (BAUD != bps) is realistic; the problem with
custom modem hardware like you're talking about is that even if we had
it or designed it, nobody else will. So if your goal is to make a
high-speed link that nobody else can use, that can work, but somehow I
don't think that's what your after. For instance if your goal is to
communicate in a disaster situation, you want to use OFF THE SHELF
HARDWARE so that other people can communicate with you. Telling people
"go buy these parts and build it" doesn't work for a disaster.
So... first figure out which of your goals has the highest priority.
I recommend taking things one step at a time. The first goal is to put
together something that actually works, even if slowly. First thing I'd
do would be to get on normal 1200 baud 2m packet radio and play with it
some. Figure out what you can do with it now and what kind of systems
are already in place. Find out what wheels are already around before
going and re-inventing one.
Now... ANOTHER angle you could take for this kind of project would be to
use a different UNLICENSED spectrum that doesn't have the same Amateur
Radio constraints. For instance, what's to say you couldn't use
directional antennas, bi-directional amplifiers, and standard wireless
hardware at 2.4 or 5 GHz to make your high speed data links?
If I were you I'd focus on off the shelf hardware for several reasons:
A: it doesn't take a year to design and test
B: it's cheaper
C: it's standard and other people will have it
--
-- Chris
--
Chris Knadle
[email protected]
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