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A stand-Alone APRS Digipeater:
EOP
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In this project, special
attention is paid to get an economical APRS Digi with minimum
current consumption, that too without using a
GPS. To achieve this, only a command statement of Location
(Lat/Long.) is required to be included in BTEXT.
FoxDigi has two D9 connectors for outside communications. J1, a
D9F is
provided for your transceiver. J1, a D9M is for connection to your
PC using a null modem cable for PIC Parameter configuration. J1 may
be used for a GPS with RS232 level support.
FoxDigi require a supply of +12V (+7-12V) from Transceiver
connector J1. An internal regulator (78L05) provides +5V for digital
circuits. Current consumption is well below 20ma (Depending on LEDs)
which is good enough for most remote solar powered locations.
Further, in this newly designed FoxDigi, you may turn off power to
MAX232 once config process is over.
FoxDigi uses a standard RS232 driver to interface
with your PC (or GPS) J2 is configured as DTE using D9M connector. A
null modem will be required for configuration of PIC. However, it should be noted that
this project is not designed for use like a tracker but rather
a Stand alone APRS Digipeater.
Project
is
designed
on 8cm X 5cm Double
Sided PTH
board and
results
were very
encouraging.
At moment firmware is at 4800 baud. This will effect both, the GPS & the "Hyperterminal" used
for config of your FoxDigi.
In a stand-alone Digipeater application, a BTEXT
beacon with your position should be good enough. As the current
consumption of a GPS is perhaps too large to handle at a remote site. |
