Codan Radio Transportable Radio Systems User Guide - Manual (Page 23)

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4.6.3 Weight
The selection of the case may be determined by its weight or conversely the application it is intended for may dictate
the maximum weight of the case. Shown below is a recommended lifting weight range from the UK government
http://www.hse.gov.uk/pubns/indg143.pdf
Note: 1 kg = 2.21 lbs
Each box contains a guideline weight for lifting and lowering in that zone. The guideline weights are reduced if han-
dling is done with arms extended, or at high or low levels, as that is where injuries are most likely to occur. The guide-
line weights assume that the load is readily grasped with both hands and that the operation takes place in reasonable
working conditions, with the lifter in a stable body position.
4.6.4 Case Size Selection
The requirements of the system may necessitate that some components are large and cumbersome. A common
situation that can cause this is frequency selection/availability for the repeater. Many times the user of the repeater
does not have much choice regarding the channels they can use in their system. This may ultimately mean that the
frequencies are very close and the system requires a large duplexer. If the duplexer needed to satisfy the system
requirements is too large for the main repeater case, then a second case can be used to contain the duplexer. In these
scenarios, it is wise to consider once again how and where the system will actually be deployed. If the system needs
to be loaded into a small helicopter, or needs to be hand carried up multiple fl ights of stairs, then multiple smaller
boxes might be much easier to handle vs. a single large box that may require multiple personnel to lift.
Other scenarios that can affect case size/weight include:
• Vehicle Mounted Repeaters – Size can get quite large for these repeater solutions however actual location of the
deployment on-scene is limited to vehicle access areas.
• Manpack Deployments – Some agencies must operate in ever-changing environments such as large scale tracking
through urban areas on foot (shopping centers for example). These deployments may require one person to carry
the repeater inside a back-pack or case during operation. This creates a moving radio coverage area that can be
quite effective in challenging RF environments. Obviously size/weight is of the upmost importance for this deploy-
ment scenario.
• Briefcase/Suitcase – For transportation simplicity, it can be benefi cial that the repeater fi t into a standard form
factor for travel such as a briefcase or suitcase. Briefcase options can allow for discrete deployments of the re-
peater. Suitcase options can allow for larger systems to be transported with relative ease as roller wheels and
other common luggage features are typically employed.
• 2-Man Lift – Many large Transportable Radio options are designed more with simplicity in mind. A single case that
can be deployed on-scene, with little or no further connections needing to be made. The trade-off with this how-
ever is that quite often the single case can become quite heavy.
Women
Men
Shoulder height
Elbow height
Knuckle height
Mid lower leg height
Shoulder height
Elbow height
Knuckle height
Mid lower leg height
3 kg
7 kg
10 kg
7 kg
3 kg
7 kg
13 kg
16 kg
13 kg
7 kg 10 kg
10 kg
10 kg
10 kg 5 kg
15 kg
5 kg
20 kg
25 kg
20 kg
ET-4 Polyethylene Briefcase Polyethylene Rack
Mount Case