TM Page 33
Figure 9 - Example of "TX.MTGS" Custom Split-Ring with IL2 Inductive Loop Assembly
CUSTOM
PACKAGED
IL2
LOOP ANTENNA
FORMED FROM
BRASS STRIP
ALUMINIUM
SPLIT-RING
TRANSMITTER
HOUSED WITHIN
RING
POWER PICKUP
LOOP ANTENNA
MOUNTED
ON
SIDE OF RING
5.2
INDUCTIVE LOOP IL2 WITH SHAFT MOUNTED POWER PICKUP LOOP OR IP2 PICKUP
Although slightly more complex to install, the inductive loop arrangement can transmit higher power and will accommodate
much greater shaft displacements in both radial and axial directions. Also, the actual loop interface transformer module
may be located remotely from the loop itself and connected by co-axial or flat ribbon cable. This can be very useful where
space is limited - inside gearboxes for example.
The IL2 module consists of a transformer to match the 50 ohms cable impedance to the loop antenna and a tuning adjuster
to enable loops of various sizes to be tuned to resonance. These parts are encapsulated within a phenolic-resin housing to
ensure maximum resistance to vibration. A range of different sized glass-fibre loop antennae are supplied as part of the IL2
parts set and loops may also be fabricated by the user (for example, oval shaped loop to accommodate large vertical shaft
displacements such as are found in vehicle driveline shafts). A mounting boss and universal mounting bracket provides a
means of installing and aligning the IL2 loop antenna. For demanding applications, the IL2 may be mounted using
bracketry and the body is drilled with 4 x m3 threaded holes to provide fixing points. Non metallic material must be used for
the bracketry.
In operation, the loop antenna is energised, via the interface transformer, by a power oscillator in the demodulator/decoder
module - usually at 2MHz frequency. This generates an alternating magnetic field within the loop antenna, which in turn
induces power into the power pickup loop. The IL2 loop antenna may also be used with custom designed split-ring shaft
mounting assemblies general part number "TX.MTGS", ( these incorporate either a locating groove for the loop wire or an
integrated glass-fibre ring with printed copper track) or a power pickup loop wound onto the shaft itself (with an intervening
insulating layer) using material provided in the CAK kit.
5.2.1
Inductive Loop IL2 with Power Pickup Loop in Split Ring Assembly "TX.MTGS"
Where a system is supplied with a custom design split-ring assembly it has been fully pre-tested and therefore requires little
adjustment. The section below "Suggested Installation Sequence" details points to be remembered.
Figures 9, 10, and 11 show typical examples of custom designs.
Summary of Contents for TX31D/1/IFM
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