Scope DataPage UHF MK2 Radio Paging System
DPMK2/6
7
07/05
Group Calls
As previously stated, this system will accept pager identities from number 1 through 9,999. Most pagers will
accept a minimum of two identities, enabling the pager to respond to selected group calls as well as its own
unique identity. Advanced pagers offer multiple identities, again, enabling one to be reserved for its own
unique identity and then for the pager to belong to a selected number of groups of pagers which can be
called collectively by entering just one identity or number. Sometimes the requirement is to have a global
call and upon the entry of this specific number the system will call all pagers at one time. As group calls are
created from single pager identities, any number of groups can be constructed to suit individual customers
requirements. The default
Global Group Call number is 9999.
Performance
The system will normally cover 95% of all range requirements with the use of just the internal antenna. The
helical quarter wave antenna supplied with the system can provide ranges of up to half a mile free space
and will normally cover industrial buildings of up to 100,000 square feet or more. This short helical wound
antenna can be replaced with a straight quarter wave which can provide ranges in excess of one mile in free
space and considerably enhance the units performance in industrial or commercial environments. Position
the unit on the opposite end of the desk to computers, telephones and intercoms etc. to minimise the
potential for cross interference.
Also, remember that the capability of your system will be affected by:-
Foil backed plaster board, metal mesh, wire reinforced glass, metal sheeting, large mirrors, suspended
ceilings, lift shafts etc. These can all reflect and thereby reduce the signalling capability of the transmitter. A
little forethought prior to installation, coupled with a few tests, can normally avoid most of these problems
Other Aerials
The range and performance of this equipment can be improved by the addition of more efficient aerials*.
These can be installed either inside or outside the building and are connected to the transmitter with 50 ohm
coaxial cable.
A glass mount is available to install on the inside of a suitable window which can boost range, especially if
its required in one direction from the building.
The centre fed half wave di-pole measuring approximately 300 mm from tip to tip, will provide excellent all
round local signalling. This can be mounted either inside or outside the building and is available in either a
light weight or heavy duty stainless steel design.
The 6 dB end fed Colinear is intended for external application and will, when elevated, boost overall range
with a slight loss to some local signals.
Pre-terminated coaxial feeders are available for 5, 10 or 15 metre requirements. High frequencies can
equate to high power losses. Always use the best quality cable. RG58 is only acceptable on cable runs of
up to 5 metres. We recommend RG213 or equivalent on greater lengths. If in doubt consult our technical
department. Coaxial cable intended for TV satellite or CCTV installations is normally 75 ohm and therefore
totally unsuitable and can cause severe transmitter damage.
*Subject to licence conditions.