[aprssig] Parallel UHF APRS level-4 node system.
jdw at eng.uah.edu
Tue Dec 28 15:00:06 CST 2004
On Dec 28, 2004, at 1:36 PM, John Denison wrote:
> from a newbie point of view, I wonder why 1200 baud is still being
I think the biggest reason is that you can get a data signal into and
out of a radio via the audio I/O. A big (the biggest?) component of ham
radio is experimentation, and a digital mode that you can build digital
hardware for without hacking or building a transceiver is very
The various microcontrollers out there (PIC, Atmel, 68HCxx, TI, etc)
that can generate (or decode, or both) the audio with few or no
external components gives us a very powerful experimental platform if
we can live within that 1200 baud AFSK limit. APRS trackers and
weather stations fit wonderfully into that particular niche.
A local ham has an Atmel based tracker that will also decode packets.
the last I heard he has experimental support for wiggling bits via APRS
messages, so his rig can not only send tracking and telemetry data from
an amateur balloon experiment, it can provide signals for cutdown
mechanisms or experiment control. Not bad for one IC, eh?
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