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External Antennas
The external antennas come in two styles.
The flat PCB antenna can be mounted inside a plastic housing or to the outside of a metal housing. The PCB
requires 3mm Clearance on all edges, this also applies to the RF window.
The bulkhead mounting antenna can be used with metal or plastic housings. Care must be taken when mounting
the Antenna to ensure the installation does not become directional.
Acquisition Module Power Supply
See Appendix B – Acquisition Module Power Supply
Attach power supply wiring to the module as shown below:
+ 3V Supply
0V Supply
Connect to a 3 Volt power supply or batteries.
WARNING: This module is not reverse polarity protected!
WARNING: The maximum voltage is 3.6V!
Battery Types
Battery Type
Alkaline
Zn-MnO
2
Nickel Metal Hydride
NiMh
89
Mantracourt Electronics Limited T24 Technical Manual
64 mm
58 mm
Notes
Pairs of alkaline 1.5V cells are the most common. Use D cells for maximum life
and AA cells where space is restricted.
Example: Varta 4014 (D), Varta 4006 (AA)
Recommend T24-PSSA module to maximise usable capacity.
Most cells are 1.2V so two in series gives 2.4 Volts. These can match alkaline
batteries in capacity but as the charged voltage is lower they do not match the
usable capacity. These batteries self discharge at a faster rate than alkalines. If
charging these cells in circuit precautions must be taken to ensure that the
maximum voltage on the T24-SA is not exceeded.
Example: GP 270AAHC (AA)
Recommend T24-PSSA module to maximise usable capacity.
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