[Cu-wireless] CD-ROM progress; other progress
dyoung at ojctech.com
Sun Jun 9 17:34:34 CDT 2002
I am making decent progress on the CD-ROM. The boot process is
sophisticated, and so it requires a lot of debugging. I doubt that it will
"just work" at our next meeting, however, it will be a lot more nearly
complete, and I will probably have certain questions. I will bring a
list of bugs and a CD-ROM to load on the devel boxes at Zach's. (When
is our next meeting, again?)
In an independent project, I am in the stage of collecting pieces to build
two wireless routers inside surplus 30mm ammunition canisters. (Darren,
the ham I met today, tells me I should consider Tupperware, and I will,
but the ammo can has a certain aesthetic/symbolic/practical appeal. Also,
an ammo can might actually be cheaper than Tupperware, it has a handle,
and it is more amenable to being locked closed and locked down.)
The way I will build these ammo-can routers is this:
Waterproof the can. Probably sand & repaint, treat w/ Rustoleum? Peter
Folk tells me there is such a thing as spray-on galvanization. Sounds
weird, but it might work.
Produce from wood, metal, or plastic, a rigid backing for the embedded
computer; screw in stand-offs; screw the computer onto the stand-offs
through the mounting holes it provides.
*Somehow* attach the embedded computer to the inside of the can. I am
still thinking about this. It would be nice if there were "bumpers"
or a "suspension" to absorb some shock, because I want the computer
to withstand some rough handling.
Install one or two Prism-based 802.11 radios w/ MMCX connectors.
Install watertight N bulkhead connectors in the side of the can;
"jump" these to the radio(s) w/ 1-ft RG-316 cable.
Install a watertight 8-pin DIN jack on the side of the can; "jump"
to ethernet jack on embedded computer w/ short Cat5 cable.
Install on the computer a 64MB CompactFlash card. (64MB is overkill;
certainly 32MB or less will fit BSD/Linux "cozily," but trimming
operating systems is a pain.)
Assemble a versatile mount for an antenna, and affix to the side of
the can. I have no idea what this will look like. It will depend my
choice of antenna, I think.
Assemble a weatherproof cat5 cable. On one end will be the watertight
8-pin DIN that mates with the connector on the ammo can. On the
other end, an ordinary RJ45 connector. The cable will probably be
UV-protected. Apparently Tepper electric sells UV-protected cable,
it is ironically called "direct-burial Cat5." Is it for all that UV
radiation in hell?
Insert between the can and its ethernet jack a power-over-Ethernet
David Young OJC Technologies
dyoung at onthejob.net Engineering from the Right Brain
Urbana, IL * (217) 278-3933
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