3 ==== Main Deploy Altitude
5 This sets the altitude (above the recorded pad
6 altitude) at which the 'main' igniter will fire. The
7 drop-down menu shows some common values, but you can
8 edit the text directly and choose whatever you
9 like. If the apogee charge fires below this altitude,
10 then the main charge will fire two seconds after the
15 When flying redundant electronics, it's often
16 important to ensure that multiple apogee charges don't
17 fire at precisely the same time, as that can over
18 pressurize the apogee deployment bay and cause a
19 structural failure of the air-frame. The Apogee Delay
20 parameter tells the flight computer to fire the apogee
21 charge a certain number of seconds after apogee has
26 Apogee lockout is the number of seconds after boost
27 where the flight computer will not fire the apogee
28 charge, even if the rocket appears to be at
29 apogee. This is often called 'Mach Delay', as it is
30 intended to prevent a flight computer from
31 unintentionally firing apogee charges due to the
32 pressure spike that occurrs across a mach
33 transition. Altus Metrum flight computers include a
34 Kalman filter which is not fooled by this sharp
35 pressure increase, and so this setting should be left
36 at the default value of zero to disable it.
42 This configures which of the frequencies to use for
43 both telemetry and packet command mode. Note that if
44 you set this value via packet command mode, the
45 TeleDongle frequency will also be automatically
46 reconfigured to match so that communication will
51 The radios in every Altus Metrum device are calibrated
52 at the factory to ensure that they transmit and
53 receive on the specified frequency. If you need to
54 you can adjust the calibration by changing this value.
55 Do not do this without understanding what the value
56 means, read the appendix on calibration and/or the
57 source code for more information. To change a
58 TeleDongle's calibration, you must reprogram the unit
61 ==== Telemetry/RDF/APRS Enable
63 Enables the radio for transmission during
64 flight. When disabled, the radio will not
65 transmit anything during flight at all.
67 ==== Telemetry baud rate
69 This sets the modulation bit rate for data
70 transmission for both telemetry and packet
71 link mode. Lower bit rates will increase range
72 while reducing the amount of data that can be
73 sent and increasing battery consumption. All
74 telemetry is done using a rate 1/2 constraint
75 4 convolution code, so the actual data
76 transmission rate is 1/2 of the modulation bit
81 How often to transmit GPS information via APRS
82 (in seconds). When set to zero, APRS
83 transmission is disabled.
86 available on TeleMetrum v2 and TeleMega
87 boards. TeleMetrum v1 boards cannot transmit
90 Note that a single APRS packet
91 takes nearly a full second to transmit, so
92 enabling this option will prevent sending any
93 other telemetry during that time.
97 Which SSID to report in APRS packets. By
98 default, this is set to the last digit of the
99 serial number, but can be configured to any
104 Whether to send APRS data in Compressed or
105 Uncompressed format. Compressed format is
106 smaller and more precise. Uncompressed
107 format is older, but may work better with your
108 device. The Kenwood TH-D72 only displays
109 altitude information with Uncompressed
110 format, while the Yaesu FT1D only displays
111 altitude with Compressed format. Test before
112 you fly to see which to use.
116 This sets the call sign included in each
117 telemetry packet. Set this as needed to
118 conform to your local radio regulations.
122 ==== Maximum Flight Log Size
124 This sets the space (in kilobytes) allocated
125 for each flight log. The available space will
126 be divided into chunks of this size. A smaller
127 value will allow more flights to be stored, a
128 larger value will record data from longer
131 ==== Ignitor Firing Mode
133 This configuration parameter allows the two standard ignitor
134 channels (Apogee and Main) to be used in different
138 This is the usual mode of operation; the
139 'apogee' channel is fired at apogee and the
140 'main' channel at the height above ground
141 specified by the 'Main Deploy Altitude' during
145 This fires both channels at apogee, the
146 'apogee' channel first followed after a two
147 second delay by the 'main' channel.
150 This fires both channels at the height above
151 ground specified by the Main Deploy Altitude
152 setting during descent. The 'apogee' channel
153 is fired first, followed after a two second
154 delay by the 'main' channel.
158 Because they include accelerometers,
159 TeleMetrum, TeleMega and EasyMega are
160 sensitive to the orientation of the board. By
161 default, they expect the antenna end to point
162 forward. This parameter allows that default to
163 be changed, permitting the board to be mounted
164 with the antenna pointing aft instead.
167 In this mode, the antenna end of the flight
168 computer must point forward, in line with the
169 expected flight path.
172 In this mode, the antenna end of the flight
173 computer must point aft, in line with the
174 expected flight path.
176 ==== Beeper Frequency
178 The beeper on all Altus Metrum flight
179 computers works best at 4000Hz, however if you
180 have more than one flight computer in a single
181 airframe, having all of them sound at the same
182 frequency can be confusing. This parameter
183 lets you adjust the base beeper frequency
188 ==== Logging Trigger Motion
190 This sets the amount of motion that TeleGPS
191 needs to see before logging the new
192 position. Motions smaller than this are
193 skipped, which saves storage space.
195 ==== Position Reporting Interval
197 The interval between TeleGPS position reports,
198 both over the air and in the log. Increase
199 this to reduce the frequency of radio
200 transmissions and the length of time available
206 ==== Configure Pyro Channels
208 .Additional Pyro Channel Configuration
209 image::configure-pyro.png[width="5.5in"]
211 This opens a separate window to configure the
212 additional pyro channels available on TeleMega
213 and EasyMega. One column is presented for
214 each channel. Each row represents a single
215 parameter, if enabled the parameter must meet
216 the specified test for the pyro channel to be
219 Select conditions and set the related value;
220 the pyro channel will be activated when *all*
221 of the conditions are met. Each pyro channel
222 has a separate set of configuration values, so
223 you can use different values for the same
224 condition with different channels.
226 At the bottom of the window, the 'Pyro Firing
227 Time' configuration sets the length of time
228 (in seconds) which each of these pyro channels
231 Once you have selected the appropriate
232 configuration for all of the necessary pyro
233 channels, you can save the pyro configuration
234 along with the rest of the flight computer
235 configuration by pressing the 'Save' button in
236 the main Configure Flight Computer window.
238 include::pyro-channels.raw[]