ConneXions CX9DC DC power, Two Port Version
CX9DC Issue
1
Page
3 of 13
System Overview
The Scope Connexions CX9DC is a 12V DC powered 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 using either or both of the two RS232 serial ports.
There are also models available which provide an additional RS232 port, a USB port, an RS485 port
and an ethernet port. Contact our Sales team on +44 (0)1803 860710 for further details. 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.
For other EC countries, referral must be made to the relevant national telecommunications authority,
who will provide licensing details and applicable frequencies.
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 sites, covering
a considerable area with just a 1/4 wave antenna (BNC terminated) connected directly to the unit.
For coverage 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 greater 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 dept where other considerations may prove this to be impractical.
A further consideration is the distance between the transmitter and the source of the data. 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, additional drivers or amplifiers must be installed at both ends of the data link.
