1
DC1765 CELLULAR PHONE PACKAGE OPERATOR'S MANUAL
1. INTRODUCTION
Telecommunication using cellular telephones is
a convenient alternative to standard phone or
RF telemetry. In areas with cellular coverage, it
has an advantage over ordinary phone lines
where the lines are not established and would
be costly to install. The advantage over an
independent RF telemetry system is that the
company providing the cellular service takes
care of the FCC licensing and maintenance of
repeater stations.
To determine if a site has sufficient cellular
coverage, a user can usually borrow a portable
cellular phone and visit the site. If a standard
cellular phone can place a call from the site with
good sound clarity and good signal strength the
site should have no problems using cellular
telemetry. If a Yagi antenna is being used, it
would be a good idea to have the cellular phone
company locate their cellular tower on a map so
the antenna can be pointed towards the tower.
Campbell Scientific's DC1765 Cellular Phone
Package includes:
Motorola S1765 Transceiver
Campbell Scientific DC112 Modem
Crydom Relay D1D07
Mounting bracket and wiring
An appropriate power supply and antenna must
be selected for each station.
The Motorola S1765 Cellular Connection
Transceiver has a standard RJ11C telephone
interface. A standard RJ11C cable connects the
DC112 Modem directly to the transceiver. A
computer equipped with the PC208 Datalogger
Support Software and a Hayes compatible
phone modem connected to a standard phone
line is used to call the cellular equipped stations
(see Figure 1-1).
The transceiver does not have a handset, but if
the user wishes to place a voice call, any
standard touchtone telephone can be
connected. However, the DC112 and a
telephone cannot be connected to the
transceiver at the same time. Programmable
phones will not work with the transceiver.
2. SPECIFICATIONS
S1765 TRANSCEIVER
Dimensions: 2.0 x 3.5 x 8.5 inches
Operating Temperature: -30 to 60
°C
Average current drain
standby: 0.38 A
on line: 2.1 A
Supply voltage: 10.9 - 16.3 VDC
Antenna Termination: Mono UHF
D1D07 RELAY
Control Voltage: 3.5-32.0 VDC
Control Current: <1.6 mA @ 5 VDC
Output Rating: 7 A @ 100 VDC
FIGURE 1-1. Cellular Telecommunications
(48 pages)
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