3 image::telemini-v1-top.jpg[width="5.5in"]
5 TeleMini v1.0 is ½ inches by 1½ inches. It was
6 designed to fit inside an 18mm air-frame tube, but using it in
7 a tube that small in diameter may require some creativity in
8 mounting and wiring to succeed! Since there is no
9 accelerometer, TeleMini can be mounted in any convenient
10 orientation. The default ¼ wave UHF wire antenna attached to
11 the center of one end of the board is about 7 inches long. Two
12 wires for the power switch are connected to holes in the
13 middle of the board. Screw terminals for the e-matches for
14 apogee and main ejection charges depart from the other end of
15 the board, meaning an ideal “simple” avionics bay for TeleMini
16 should have at least 9 inches of interior length.
18 === TeleMini v1.0 Screw Terminals
20 TeleMini v1.0 has four screw terminals on the end of the
21 board opposite the telemetry antenna. Two are for the apogee
22 and two are for main igniter circuits. There are also wires
23 soldered to the board for the power switch. Using the
24 picture above and starting from the top for the terminals
25 and from the left for the power switch wires, the
26 connections are as follows:
28 [options="header",grid="all",cols="2,3,10"]
30 |Terminal #|Terminal Name|Description
34 |Apogee pyro channel connection to pyro circuit
38 |Apogee pyro channel common connection to battery +
42 |Main pyro channel connection to pyro circuit
46 |Main pyro channel common connection to battery +
50 |Switch connection to flight computer
54 |Switch connection to positive battery terminal
57 === Using a Separate Pyro Battery with TeleMini v1.0
59 As described above, using an external pyro battery involves
60 connecting the negative battery terminal to the flight
61 computer ground, connecting the positive battery terminal to
62 one of the igniter leads and connecting the other igniter
63 lead to the per-channel pyro circuit connection. Because
64 there is no solid ground connection to use on TeleMini, this
67 The only available ground connection on TeleMini v1.0 are
68 the two mounting holes next to the telemetry
69 antenna. Somehow connect a small piece of wire to one of
70 those holes and hook it to the negative pyro battery terminal.
72 Connecting the positive battery terminal to the pyro
73 charges must be done separate from TeleMini v1.0, by soldering
74 them together or using some other connector.
76 The other lead from each pyro charge is then inserted into
77 the appropriate per-pyro channel screw terminal (terminal 3 for the
78 Main charge, terminal 1 for the Apogee charge).
80 === Using an Active Switch with TeleMini v1.0
82 As explained above, an external active switch requires three
83 connections, one to the positive battery terminal, one to
84 the flight computer positive input and one to ground. Again,
85 because TeleMini doesn't have any good ground connection,
86 this is not recommended.
88 The positive battery terminal is available on the Right
89 power switch wire, the positive flight computer input is on
90 the left power switch wire. Hook a lead to either of the
91 mounting holes for a ground connection.