Both. It depends entirely on how the pre-existing network is set up.
There is a band in which point-to-point links are the *only* legal
mechanisms ( the 219Mhz band ). Most Amateur networking is a true "cloud"
approach - it isn't really feasible to set up strict point-to-point links
because machines are always being turned on and off, you never know when
someone new will start up a new node, etc.
> 2. What kind of gear would be needed, apart from taking the HAM exams?
>
At least a transciever, of course. If you want speeds from 1200bps to
9600bps, then you can get by with a TNC. ( Terminal Node Controller, which
is essentially a very intelligent modem ) If you want higher speeds,
you'll need to get an RF modem and appropriate controller card. Of course,
you also have to purchase support equipment like antennas, cables, power
supply, etc.
> 3. What kind of reliable distance is achievable without external
> aerials?
>
Again - it depends. You may be relatively close to another machine,
from which you can hop out into the network at large. I can go all over
the Northeast from my location, which is relatively poor. ( I'm at the
bottom of a valley ) On the other hand, indoor antennas are *HIGHLY*
discouraged in networking, because the other stations on the frequency need
to be able to hear you when you transmit, to maximize efficiency.
Otherwise, your station and someone elses station may try and transmit at
the same time, and would interfere with each other.
> 4. What s/w is required to achive any of the above.
>
You can get by with a dumb terminal. Many people, of course, use snazzy
gee-whiz graphic terminal software. :-)
> 5. Is there a FAQ for the questiones I just possed? :-)
>
Go to www.tapr.org. They have some *excellent* introductions to Packet
Radio, and Amateur networking technologies.
- Rich
-- Rich Mulvey My return address is my last name, followed by my first initial, @mulveyr.roc.servtech.com http://mulveyr.roc.servtech.com Amateur Radio: aa2ys@wb2wxq.#wny.ny.usa