Re: Seattle CWN Concepts was SeattleWireless Node Fundraiser

> If your willing to accept responsbility for it, no reason you can't do
> this under part 97. The rules now allow personal business to be conducted
> on amateur radio, so for example it is OK to shop on Ebay.

And I am certain that someone could come up with some reason to
operate under part 97.  But in our case, and for just about any CWN,
there no real need to burden your organization with all the
disavantages of part 97 with pretty much none of the advantages.  With
our system, we *want* people to conduct business, and we dont want to
tell people what they can and cannot do.

> Channels 1-6 are entirely on the amateur band, so you can operate two
> non-interfering channels. Also some hams from Germany have recrystaled the
> WRT54G's, and that might give you one more (below the part 15 allocation).

Here is my technical basis for my "only 1 channel" statement:

an 802.11b/g carrier is 22MHz wide.  802.11 channel numbers refer to
center frequencies.

Channel 6, 2450MHz, is on the edge of the amateur band (2390-2450). 
This would spill 11MHz out of band onto ~2450.1-2460MHz.    Operating
on a center frequency below 2450 (perhaps 2438) would cause overlap on
our channel 1 carrier, and cause considerable signal degration.   This
would also rule out operation on 2401.

The 2300-2310 swath would be completely out of the question, since it
really could not fit a carrier without spilling over into non-amateur
bands.  Im sure a particular satellite radio company would not be
happy.

One could possibly operate in a cross polarized configuration on a
semi-overlapping frequency, but this would still cause significant
degration.  That would put us a couple dB down, and at that point you
would want to operate at a reduced power level too, which then puts us
back at part 15 levels....

Now, downconvert it to the 1.2GHz band, and now you have a pretty good
argument for part 97.
_______________________________________________
Dev mailing list
[email protected]
http://seattlewireless.net/mailman/listinfo/dev