[aprssig] poor man's blue tooth
brozgrimm at hotmail.com
Wed Aug 4 14:46:21 EDT 2004
One thing that needs to be looked for legality at is the legality of
using these modules for streamed data. It's been a while since i last
looked at the rules, but as I recall, Part 15 unlicensed operation
requires that the transmission cycle be no more than 1/10 of the time;
it's meant for short burst communuication and not continuous streams of
Now, if you meant to use these as amateur transmitters, it'll need the
10 minute idenfication as well as a reduction from 8-bit ASCII to 7-bit
ASCII (according to
305.html#309, only 7-bit ASCII is permitted), both of which will
require more smarts than just RS232 level translation.
Date: Tue, 03 Aug 2004 15:32:33 -0400 (EDT)
From: wes at johnston.net
Subject: [aprssig] poor man's blue tooth
To: aprssig at lists.tapr.org
<20040803123233.22322.h016.c000.wm at mail.johnston.net.criticalpath.net>
Content-Type: text/plain; charset=iso-8859-1
Although one of the arguements against blue tooth enabled GPS units is
just have that many more batteries to replace... consider this...
I'm thinking of two uses..
1)I have a GPS unit in my car and want to stream the GPS data to a
having to have a tangle of wires. My GPS is already wired to a d700.
2)In an emergency comms bus, I want to have the ability to share GPS
and TNC data
with other users. I don't need them to be able to talk back, just to
going on around them.
I think a neat "one to many" solution is Linx Technologies LC 433mhz rf
The modules are simple 433mhz radios with serial in / serial out. The
is $5.60 in onesies, RX module is $11.80. These modules TX at 5kbps at
of 300 feet. All we need is to add them to a PCB with will do the
level conversions and Y GPS data and TNC data together (on the TX
each person/laptop you want to beable to see what is going on a RX
rs232 or they have a rs232 to USB module for $10. Now you can "stream"
of the em comm bus to a public display (in the case of a publicity show
or even share a GPS between two cars which are following each other....
or pass a
laptop around the inside of car w/o wires.
I have seen the village...
and I don't want it raising my children.
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