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== Configuration
There are three things you need to configure identically in each unit
that is part of a TeleLaunch system for wireless communications to
succeed. Those are the operating frequency, the callsign, and a key
for the AES encryption algorithm. Additionally, each TeleFire unit
also needs to be configured with a unique bank number.
Please note that these values must match exactly, or the system will
not operate as expected. That means the callsign needs to have the
same choices of upper or lower case, no trailing spaces, etc. And
the operating frequency and AES key must match.
=== Connecting to a Unit
Configuring each unit of a TeleLaunch system requires use of
a micro USB cable, and a computer with a suitable terminal
emulation program. Connect a suitable cable, open your
favoriate terminal emulation program, and power up the unit.
By pressing <enter> you should see a command prompt.
=== TeleLCO
The USB connector on TeleLCO is accessible without
opening the lid of the Pelican box. Look for the
blue dust cap over the connector under the handle.
=== TeleFireEight
The USB connector on TeleFireEight is located on the
circuit board. To access it, open the box and flip
the lid up. you should be able to spot a vertical
micro USB connector on the board near the DIP switch.
[WARNING]
Please take care when closing the TeleFireEight lid
not to pinch any wires.
=== Operating Frequency
The TeleLaunch system supports operation over much of the
"70cm" Amateur Radio band, with the filters optimized for a
center frequency of 435 MHz. For each system, a single
operating frequency should be selected and programmed into
each unit.
The default frequency for units leaving the factory is
435.750 MHz. Since Altus Metrum flight computers operate
by default on 10 100khz channels from 434.550 to 435.450 MHz,
we chose this frequency to be far enough away from flight
computers to avoid any interference, but still close enough
to the radio subsystem design center frequency for great
performance.
To configure the frequency, use your terminal emulator to
issue two commands. First, use 'c F xxxxxx' where the xxxxxx
is replaced with the desired operating frequency in kHz. Then
use the 'c w' command to save this value into non-volatile
memory. For example, the default 435.750 MHz would be
configured using
c f 435750 +
c w
=== Callsign
In the US, you need an
link:http://www.altusmetrum.org/Radio/[amateur radio license]
or other authorization to legally operate the radio
transmitters that are part of TeleLaunch.
The default callsign shipped from the factory is "N0CALL",
which is not a valid callsign and meant to humorously point
out that the callsign hasn't been configured yet.
Individual owners of a TeleLaunch system should use their
own callsign.
Club owners of a TeleLaunch system should pick the callsign
of one club member who is willing to be designated as the
control operator of the system. Under FCC Part 97 rules,
being the control operator does not mean you have to be LCO
all the time, it just means taking responsibility for ensuring
the system is being operated in compliance with the rules.
To configure the callsign, use your terminal emulator to
issue two commands. First, use 'c c callsign' to set the
callsign, then use 'c w' to write to non-volatile memory.
For example, to set the default N0CALL, the commands would
be
c c N0CALL +
c w
=== AES Key
For safety, TeleLaunch uses cryptographic checksums to help
prevent interference, intentional or un-intentional. This
means each system must have a shared AES encryption key
identically configured into each unit.
The key size required is 128 bits, which must be expressed
as a 32-digit hexadecimal number.
To configure the AES key, use 'c a key' followed by 'c w'
to write the key to non-volatile memory. For example, to
configure your system with a key that is the answer to life,
the universe, and everything, the commands would be
c a 00000000000000000000000000000042 +
c w
=== Bank Number
Each TeleFire unit needs to be configured with a bank number,
and bank numbers should be unique within a given system. For
most systems with 8 or fewer banks, just use the DIP switch
on the circuit board inside the TeleFire unit to select the
desired bank. Only one switch should be turned on. Switch
one means bank one, etc.
To allow systems to have more than 8 banks, if all the DIP
switches are "off", the unit will use the bank configured in
non-volatile memory.
To configure the bank number, use 'c B bank' followed by
'c w' to write to non-volatile memory. For example, to
set the bank to 42, the commands would be:
c B 42 +
c w
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