User's Manual

Personnel Alert: Base Station
User Manual
a Caution
For multi-base station installations, ensure that adjacent
base stations do not have the same hopping pattern, as
interference will result.
The following Table 7. Frequency Hopping Pattern
represents the decimal to binary conversion for the dip switch
S2 settings. 0-6 and 7=1 (Zoltan)
Table 15. Frequency Hopping Pattern
Decimal 1 2 3 4 5 6 7
Binary 001 010 011 100 101 110 111
Adjusting the Transmit/Receive Attenuation
Levels
Area coverage of the base station can be controlled by
adjusting the transmit/receive attenuation levels in the base
station to match the actual radio coverage area that was
determined during the area system planning.
The attenuation adjustments are also used to tune the
amount of coverage overlap between base stations.
Proper operation of the Personnel Alert system requires that
robust data transfer in both directions: from the base station
to the badges, and from the badges to the base station.
The 1 Watt maximum transmit power of the base station can
never be exceeded. However, by using the attenuation
adjustments, it can be reduced by up to 40dB. Attenuation
can also be used to adjust the receive path in the base
station to maintain a similar loss in both the receive and
transmit links.
The transmit power levels and the receive sensitivity are
fixed for the badges and cannot be adjusted.
To adjust the base station attenuation levels, it is necessary
to physically walk with a badge within the coverage area(s) to
determine the range of each base station.
After establishing the boundaries between the coverage
areas, review the site plans to determine if base station
power levels need to be reduced.
If a “coverage hole” is revealed, verify if
• an additional base station is required,
• attenuation reduction of the neighbouring base stations
is required,
• the mounting height of the base station needs to be
increased, or
• the location of the base station needs to be changed.
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