- 8 -
Primary/Secondary Switch SW 1 – J5
This switch input will select the primary or secondary operating parameters. When left floating, or at 5 volts, the primary
parameters are used. When grounded, secondary parameters are used. Whenever this switch is changed, the timers
are reset, the Carried Detect LED (D2) will blink rapidly for a short time, and then a transmission will be sent. SW1 is also
available on J1 pin 4. This switch input is optional, and can be left unconnected.
Power Switch – J6
J6 can be used to control power to the radio and/or GPS. TinyTrak3 can be configured to assert J6 with 5V just before a
transmission is sent. After the transmission, J6 will drop back to 0 volts until the next transmission is ready. Be sure to
choose a relay that can handle the power requirements of the radio and GPS. A Radio Shack 5VDC Reed Relay (275-
232) can be used to control power to a radio that draws less than 1 amp. This output is optional, and can be left
unconnected. See the Power Switch section in the Configuration Software.
Serial Power Enable – J7
To bridge serial power J2 pin 4 to TinyTrak3 power J3 and J1 pin 7, this jumper on the bottom of the PCB should be
shorted by dropping a bead of solder across the two square pads. This will allow the GPS to receive power from the
TinyTrak3 power source, or let the TinyTrak3 be powered from the serial connector. If serial power is not needed, leave
this jumper open.
Operations
Configuration Software
To set user options, such as call
signs and transmit rates, use the
TinyTrak3Config.EXE program,
available from www.byonics.com.
First, power TinyTrak3 and connect
it to a computer serial port. Be sure
to use a gender-changer, and a
null-modem adapter. Launch
TinyTrak3Config.EXE, and select
the connected serial port. Click
“Version” to confirm the config
program can communicate with
TinyTrak3. If a firmware version
number is reported, the software
and circuit are communicating. If
not, re-check all previous steps.
Click Read to upload the current
configuration, edit all fields for
desired options, and click Write to
download options to the chip.
Reading the Configuration is
always performed twice and
compared in the program to insure
correct data. Writing the configuration is always followed by a read and compared to insure correct data. A dialog will
notify the user when the read or write is complete, and if it was successful. A read or write operation may fail if the unit is
transmitting. If this happens, simply try again. Detailed information about each configuration parameter is included below.
Primary / Secondary
These tabs select whether the software is viewing and setting the primary or secondary parameters. All parameters can
be adjusted independently in the two configurations. The primary settings will be used if the SW1 input is left floating or
connected to 5 volts. The secondary settings will be used if SW1 input is grounded.
Callsign
This is the identification of the transmitting station. It can be an amateur radio call sign such as N6BG, or a tactical call
such as BUS. No more than 6 characters (excluding SSID) may be used. If a tactical call is used, an amateur radio call
