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.
43 This configures which of the frequencies to use for
44 both telemetry and packet command mode. Note that if
45 you set this value via packet command mode, the
46 TeleDongle frequency will also be automatically
47 reconfigured to match so that communication will
52 The radios in every Altus Metrum device are calibrated
53 at the factory to ensure that they transmit and
54 receive on the specified frequency. If you need to
55 you can adjust the calibration by changing this value.
56 Do not do this without understanding what the value
57 means, read the appendix on calibration and/or the
58 source code for more information. To change a
59 TeleDongle's calibration, you must reprogram the unit
62 ==== Telemetry/RDF/APRS Enable
64 Enables the radio for transmission during
65 flight. When disabled, the radio will not
66 transmit anything during flight at all.
68 ==== Telemetry baud rate
70 This sets the modulation bit rate for data
71 transmission for both telemetry and packet
72 link mode. Lower bit rates will increase range
73 while reducing the amount of data that can be
74 sent and increasing battery consumption. All
75 telemetry is done using a rate 1/2 constraint
76 4 convolution code, so the actual data
77 transmission rate is 1/2 of the modulation bit
82 How often to transmit GPS information via APRS
83 (in seconds). When set to zero, APRS
84 transmission is disabled.
87 available on TeleMetrum v2 and TeleMega
88 boards. TeleMetrum v1 boards cannot transmit
91 Note that a single APRS packet
92 takes nearly a full second to transmit, so
93 enabling this option will prevent sending any
94 other telemetry during that time.
98 Which SSID to report in APRS packets. By
99 default, this is set to the last digit of the
100 serial number, but can be configured to any
105 Whether to send APRS data in Compressed or
106 Uncompressed format. Compressed format is
107 smaller and more precise. Uncompressed
108 format is older, but may work better with your
109 device. The Kenwood TH-D72 only displays
110 altitude information with Uncompressed
111 format, while the Yaesu FT1D only displays
112 altitude with Compressed format. Test before
113 you fly to see which to use.
117 This sets the call sign included in each
118 telemetry packet. Set this as needed to
119 conform to your local radio regulations.
124 ==== Maximum Flight Log Size
126 This sets the space (in kilobytes) allocated
127 for each flight log. The available space will
128 be divided into chunks of this size. A smaller
129 value will allow more flights to be stored, a
130 larger value will record data from longer
133 ==== Ignitor Firing Mode
135 This configuration parameter allows the two standard ignitor
136 channels (Apogee and Main) to be used in different
140 This is the usual mode of operation; the
141 'apogee' channel is fired at apogee and the
142 'main' channel at the height above ground
143 specified by the 'Main Deploy Altitude' during
147 This fires both channels at apogee, the
148 'apogee' channel first followed after a two
149 second delay by the 'main' channel.
152 This fires both channels at the height above
153 ground specified by the Main Deploy Altitude
154 setting during descent. The 'apogee' channel
155 is fired first, followed after a two second
156 delay by the 'main' channel.
158 ifdef::telemetrum,telemega,easymega[]
161 Because they include accelerometers,
162 TeleMetrum, TeleMega and EasyMega are
163 sensitive to the orientation of the board. By
164 default, they expect the antenna end to point
165 forward. This parameter allows that default to
166 be changed, permitting the board to be mounted
167 with the antenna pointing aft instead.
170 In this mode, the antenna end of the flight
171 computer must point forward, in line with the
172 expected flight path.
175 In this mode, the antenna end of the flight
176 computer must point aft, in line with the
177 expected flight path.
178 endif::telemetrum,telemega,easymega[]
180 ==== Beeper Frequency
182 The beeper on all Altus Metrum flight
183 computers works best at 4000Hz, however if you
184 have more than one flight computer in a single
185 airframe, having all of them sound at the same
186 frequency can be confusing. This parameter
187 lets you adjust the base beeper frequency
193 ==== Logging Trigger Motion
195 This sets the amount of motion that TeleGPS
196 needs to see before logging the new
197 position. Motions smaller than this are
198 skipped, which saves storage space.
200 ==== Position Reporting Interval
202 The interval between TeleGPS position reports,
203 both over the air and in the log. Increase
204 this to reduce the frequency of radio
205 transmissions and the length of time available
209 ifdef::telemega,easymega[]
211 ==== Configure Pyro Channels
213 .Additional Pyro Channel Configuration
214 image::configure-pyro.png[width="5.5in"]
216 This opens a separate window to configure the
217 additional pyro channels available on TeleMega
218 and EasyMega. One column is presented for
219 each channel. Each row represents a single
220 parameter, if enabled the parameter must meet
221 the specified test for the pyro channel to be
224 Select conditions and set the related value;
225 the pyro channel will be activated when *all*
226 of the conditions are met. Each pyro channel
227 has a separate set of configuration values, so
228 you can use different values for the same
229 condition with different channels.
231 At the bottom of the window, the 'Pyro Firing
232 Time' configuration sets the length of time
233 (in seconds) which each of these pyro channels
236 Once you have selected the appropriate
237 configuration for all of the necessary pyro
238 channels, you can save the pyro configuration
239 along with the rest of the flight computer
240 configuration by pressing the 'Save' button in
241 the main Configure Flight Computer window.
243 include::pyro-channels.raw[]
245 endif::telemega,easymega[]