[H-GEN] radio modems - the story so far.

[Chris Baird]

(Note reply-to: being general at humbug.org.au vs Chris Baird <cbaird at turing.une.edu.au>)

> Im still definaly interested in getting this all up and running.
> Who knows..

Back in the v.early 1990's, Newcastle's Mad Computer Scientists, Mick
Brown and I, had a few similar projects going...

	a) a microwave<->ethernet repeater, based on "garden variety"
	   gun diodes and a ARRL cookbook design.  There were a few
	   HNA users in the neighbourhood, so line-of-sight wasn't a
           problem.

	b) a standard-ish packet radio network, but using <5mW
           transceivers, and therefore, like the walkie-talkie toys,
           never needing a licence. The number of repeaters/bridges
	   needed was always the question though...

	c) "the sunrise project"-- using bright directional light
           sources with a fast switching time (zillions of LEDs?) to
           broadcast a carrier and signal _into_the_sky_ above our
           house (invisible to the eye), and using sensitive
           photodiode receivers to detect the carrier. Intended for
           broadcast material like Usenet. (In those days, news made
           up for most of our AARNet link's volume, believe it or
           not. :)

We did managed later to get our hands on a real TNC [packet
transceiver], but you didn't hear that, because we didn't have
licences at the time. :)

[Mick later got his ham licence, and when I last heard he was busily
trying to get Newcastle to upgrade their Mt. Sugarloaf repeater to
19200.]

-- 
Chris,,

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