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MX920 Base Station & Repeater
2. Installation and Operation
2.1 Installation
MX920 series radios are securely packed for transport with special packers within a
cardboard container. Before unpacking the MX920 radio, please inspect the packaging
for signs of damage and report any damage to your MX920 distributor.
Upon unpacking of the MX920 radio, please ensure that all items shipped were
received, report any missing items to your MX920 distributor.
Check the fan is free or does not look blocked as operation of the radio will be
affected if any packaging or shipping damage causes the fan to stop working.
If you intend to install the radio in an equipment rack consult the suppliers
instructions for your system. If the radio is to be used in a stand-alone configuration,
ensure that it is in a secure, dry location with sufficient air space around it to allow for
adequate ventilation. It is recommended that the chassis is earthed to the equipment
rack.
Equipment connection details are located in Appendix 8.1. The MX920 will draw
approximately 7 to 9A (band dependent) for 50 Watts on transmit and the gauge of the
DC cable fitted to the 12V supply connector should be adequate to ensure less than
0.5V volt drop at this current.
2.2 Screw Head Types
Modern screws employ a wide variety of drive designs, each requiring a different kind
of tools to drive in or extract them. Spectra Engineering has chosen the Pozidriv ®
screw head and screwdriver as it preferred screw type on all of its products, sizes 1 &
2. This is because the Pozidriv system is the choice for high volume assembly
operations. It provides self-centring system and excellent driving control with less
operator fatigue.
It is similar to the classic Phillips cross-head. The differences lie in the way that the
heads are machined. The Phillips head has 4 simple slots cut out of it, whereas in the
case of the Pozidriv each slot is the result of two machining processes at right angles.
The result of this is that the arms of the cross are parallel sided in the case of Pozidriv,
and tapered in the case of Phillips. The Pozidriv has four additional points of contact,
and does not have the rounded corners that the Phillips screw drive has.
Phillips screwdrivers will usually work in Pozidriv screws, but Phillips screwdrivers
are likely to slip or tear out the screw head when used in Pozidriv screws. It is
important that you use the correct type and size screwdriver to avoid damaging the
screw head.
Pozidriv
Exrta contact points
Philliips
Figure 1-1 Top view of screw heads
Technical Manual
2003 Revision
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