ConneXions II V7 SDC DC, Single Port Version
CONV7SDC 07/05
Issue 4
3
System Overview
The Scope ConneXions II is a POCSAG data display radio paging system which can be used to
transmit both text and numeric messages direct to pocket pagers carried by individuals or entire
groups. Information is input by way of an RS232 serial port. The unit can also be used in conjunction
with an optional telephone interface, thereby enabling any telephone within the building or complex of
buildings to access the paging system. Up to 9,999 pagers can be supported on any one system.
Note ! This system requires a valid OFCOM licence for operation in the UK. It is the user’s
responsibility to apply for an On-Site Paging licence on form Of21 Private Business Radio Licence
Application Form, available online at www.ofcom.org.uk.
The relevant clauses on the Of21 form should be completed as follows:
Section 2, item 9. Tick “
Self-Select PBR licence
”
Section 4, item 28. Generally, antennas provided by Scope are
Omni-Directional
, with a gain of
0
dB.
Section 4, item 30. ERP level:
0.5W
as standard,
2W
if the optional amplifier is fitted.
Section 1: Installation
The information contained in this Section is intended for use by authorised system installation
engineers only. Unqualified personnel should not undertake installation of this equipment
under any circumstances whatsoever.
Siting of the hardware
Before locating the hardware in any given location, it is important to take into account the range of
operation that you require to obtain from your system. The standard transmitter can quite easily
provide ranges of up to a mile or more and will provide excellent propagation on most industrial sites,
covering a considerable area with just a quarter wave antenna (BNC terminated) connected directly to
the unit.
For coverage of very large sites, or where exceptionally difficult operating conditions exist, it may be
advantageous to install an external antenna. Installing the transmitter on the second or third floor of a
building will more often than not boost overall range. However, horizontal range is not always required
as much as propagation through a multi storey building. Here it may be more useful to use a small
external antenna mounted outside the building at half the building height. Sometimes range is
required more in one direction than in the other: moving the aerial to one side of the building can
provide a bias in the required direction, which may overcome the range difficulties. (See section:
Other Antennas
).
Important:
coaxial feeds which are longer than 5 metres must employ low loss 50 ohm coax. We
normally do not recommend feeds of more than 15 metres for standard applications. However, we
suggest you contact our technical department where other considerations may prove this to be
impractical.
A further consideration that must be taken into account is the distance between the transmitter and
the source of the data feeding the transmitter. If the unit is to deploy a standard RS232 serial
interface, reliable reception of the data should not be attempted in excess of
15 metres
of cable.
These cables should be screened/shielded and must be kept clear of sources of induced magnetic or
electrical noise. In the event that distances of over 15 metres are required for the data feed,
additional drivers or amplifiers must be installed at both ends of the data link.
