Sea Air and Land Communications 1178 User Manual

Page of 4
11-78-0000
SYNTHESIZED UHF 4 WATT
NRZ DATA TRANSMITTER
PRODUCT
INFORMATION
Sea Air and Land Communications Ltd, PO Box 22-621, 120 St Asaph Street, Christchurch, New Zealand
11-78-0000 SYNTHESIZED NRZ DATA TRANSMITTER PRODUCT INFO
Issue 11787TA
Sea Air and Land Communications Ltd
Page 1
11-78 NRZ
UHF DATA TRANSMITTER
1.0
DESCRIPTION   
The 11-78 is a stand-alone 4 watt NRZ data paging transmitter.  It has
a special modulator design capable of transmitting frequency shift
keying down to DC, using a dual point modulation synthesizer.
The unit can be configured via an RS232 serial interface adapter
(SALCOM 11-46) using the Product Support Disk (PSD) programming
software.
The unit supports three inputs, PTT, DATA and BUSY. An internal data
delay can be selected for use in simulcast networks, and a “maximum
on air timer” (MOAT) can be implemented.
An independent PTT output is available, controlled by the MOAT or 
BUSY functions, for enabling external power amplifiers or aerial
changeover relays.
Over temperature cutout:     When the unit transmits at full power in a
hot  environment, a protective cutout may operate. This will reduce the
output power to a safe level, and will reset when the unit temperature
has fallen to below 70 deg. This cutout is designed to avoid  permanent
damage to the transmitter.
1.1
Year 2000 compliance statement:   SALCOM has made every effort
towards year 2000 compliant systems and software.  However, as our
products are often used as system integration tools or rely on other
systems, we cannot fully determine their behaviour in every
environment. 
Full Y2K Compliance can be defined as follows:
(1)
No value for current date will cause any interruption in
operation
(2)
Date based functionality must behave consistently for
dates prior to, during and after year 2000
(3)
In all interfaces and data storage, the century in any
date must be specified either explicitly or by
unambiguous algorithms or rules (like a 'pivot' date)
(4)
Year 2000 must be recognized as a leap year
The 11-78-0000 has no internal time or date reference.  It is