User's Manual

Page 40

E Series Data Radio – User Manual

Part H – Maintenance

Routine Maintenance

Considerations

The E Series hardware itself does not require routine maintenance.

However all radio products contain crystal frequency references,

and the stability of these crystals changes with time. The effect of

this is that the product will slowly drift off frequency, and eventually

it will require re-calibration. E Series radios are designed with

high quality, low drift speciﬁcation references, to ensure a

long maintenance free lifespan. The length of this lifespan will

depend on the severity of temperature extremes in the operating

environment, but is normally 3–5 years. Extended frequency drift

can be detected using TVIEW+ Diagnostics “Freq error” parameter.

Generally, re-calibration is achieved by replacing the radio in the

ﬁeld with a spare, and returning the radio to a service centre for

re-calibration and speciﬁcation testing at moderate cost.

Routine maintenance should be performed on external equipment

subject to greater environmental stresses including antennas, RF

feeder cables, backup batteries and cooling fans (if required). This

maintenance should include testing of site commissioning ﬁgures

such as received signal strength, VSWR, P/S voltage etc.

Part H – Maintenance