Mike Perryman wrote:
>I have heard some rumblings of TCP/IP experimentation in the ham bands, but
>no details as of yet. It is a subject I am very interested in. There would
>be numerous uses for that concept as it relates to our hobby. Hopefully
>someone can shed a little light on the subject as I am certainly no expert
>in this arena.
>
TCP/IP over AX.25 (encapsulated) was working in the late 80's, and
became fairly popular in the early 90's. (AX.25 being the protocol more
typically called "Packet Radio" by most hams.) Worked well. In an
insightful move, early Internet hams also allocated us addresses in the
global address allocations. The entire 44.0.0.0/8 TCP/IP address range
is still allocated world-wide to Ham Radio on the Internet.
TCP/IP over Packet was speed-limited by the modulation type(s) and
radios used, so by todays standards it was very slow. Some folks did
move on up to microwaves and push the speed limits up, but most hams
playing with IP-over-Packet used UHF where they could cram 9600 bps
through a standard UHF FM radio if they pulled the receive audio off the
discriminator and were careful about levels on the input side. On VHF,
1200 bps was common. Both were typically set up half-duplex, although
with a little ingenuity and more radios, point-to-point links didn't
have to be.
TCP/IP over Ham Radio is getting a bit off-topic for Repeater-Builder,
but if you have any questions I can point you to some other lists and
resources off-list. Fire me off a note.
Nate WY0X
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