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