Maritec PMG1

PMG1 - Programmable Modulation Waveform Generator

General Description

The Programmable Modulation Waveform Generator Model PMG1 creates the required modulation waveforms as set out in IEC61993-2 paragraph 10.4 and IEC 62287 paragraph 10.4. It can perform the encoder requirement as set out in IEC61993-2 10.6.

The PMG1 is a conveniently sized add on for any good quality signal generator. All menu entries are displayed on a 2 X 16 character LCD screen for easy visibility. Toggle switches have been limited to the power switch to prevent factory damage. Utilization of positive action high quality push switches is included in the design.

The PMG1 is field programmable and upgradeable.

Operation

The operation is simplified to multiple choices. An AIS and DSC profile are uploaded to the PMG1 with transponder data to allow VDL simulation.

Automated PC API Operation.

Automated control is now standard using the RS232 presentation port on the PMG1. A simple string library is all that is required to control all facets of the PMG1. View the operational and technical manual for further information.

Features

Encoder Function as stated in IEC61993-2 paragraph 10.6 “Encoder for receiver measurements”.
Standard DSC test signal as defined in 10.4.1
Standard TDMA test signal as defined in 10.4.2
Standard TDMA test signal as defined in 10.4.3
Standard TDMA test signal as defined in 10.4.4 (Class B draft IEC 62287)
Own user profile
VDL Packet creation for message types 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24 (extended using AIS Developer Studio interface )
Includes CCITT 511 bit pseudo-random test pattern.
Non-volatile memory retains programming on power down.
Manual Menu driven command set.
Automated control via simple string API.
External DC operation.
Automatic Synchronization scheme.
LCD display with backlight.
Push button selection of menu and variables.
VDO String generation
See Download Page

Minimum Keyboard And Display (Extended using AIS Developer Studio Interface)

Menu A Items:

ITEM 1	SETTING	SET GMSK BT 0.5 SET GMSK BT 0.4 SET GMSK BT 0.3 SET DSC PRE-EMPHASIS SET DSC NO PRE-EMPHASIS
ITEM 2	Multiple DSC	Test Signal Number 1
ITEM 3	Multiple Msg 8 TDMA	Test Signal Number 2
ITEM 4	Multiple Msg 8 TDMA	Test Signal Number 3
ITEM 5	Multiple Msg 8 TDMA	Test Signal Number 4
ITEM 6	Multiple Msg 8 TDMA	Test Signal Number 5
ITEM 7	Manual Single Entry	MANUAL VDL MSG TYPE 1 +VDO MANUAL VDL MSG TYPE 2 +VDO MANUAL VDL MSG TYPE 3 +VDO MANUAL VDL MSG TYPE 4 +VDO MANUAL VDL MSG TYPE 5 +VDO MANUAL VDL MSG TYPE 9 +VDO MANUAL VDL MSG TYPE 11 +VDO MANUAL VDL MSG TYPE 18A +VDO MANUAL VDL MSG TYPE 18B +VDO MANUAL VDL MSG TYPE 19 +VDO MANUAL VDL MSG TYPE 21 +VDO MANUAL VDL MSG TYPE 24A +VDO MANUAL VDL MSG TYPE 24B +VDO MANUAL DSC Position & Name
ITEM 8	System	DISPLAY GPS GPGGA STRING
ITEM 9	System	SERIAL NUMBER 010101-xxxx SW Version

Menu B Items:

ITEM 1	Stream	Infinite stream 10101010
ITEM 2	Stream	Infinite stream 00110011
BT of 0.5,0.4,0.3 selectable for each menu item – NO NRZI encoding is performed on this stream

Synchronization in order of priority:

Internal Slot Map synchronized with	External GPS GGA	External GPS 1PPS
Internal Slot Map synchronized with	Profile GPS	External EUT 1PPS
Internal Slot Map synchronized with	Profile GPS	Internal slot map

Synchronization in order of priority:

Internal Slot Map synchronized with	External GPS GGA	External GPS 1PPS
Internal Slot Map synchronized with	Profile GPS	External EUT 1PPS
Internal Slot Map synchronized with	Profile GPS	Internal slot map

Generator A Specification:

GMSK

DSC

BT selectable 0.5,0.4,0.3

V23

Front Panel 50 Ohm BNC Socket

PTT

Internal PTT O/P

Rear Panel 50 Ohm BNC Socket

Generator B Specification:

GMSK

BT selectable 0.5,0.4,0.3

Front Panel 50 Ohm BNC Socket

Dimensions:

283mm Wide

135mm Deep

60mm High

Connectors:

DC power source.	Nominal 12VDC @ 500mA
Fuse Socket	500 mA Continental
Signal Generator A	BNC Socket Output
Signal Generator B	BNC Socket Output
Internal Bit Clock	BNC Socket Output
Female RS232 socket	external GPS/ 1PPS/SYNC
Female RS232 socket	Presentation Port and Proprietary

Design Reference Documents

Document Number	Title
IEC 61993-2	Universal Ship borne Automatic Identification System (AIS).
ITU-R M.1371-1	Technical characteristics for a universal ship-borne automatic identification system using time division multiple access in the maritime mobile band.
ITU-R M.493	Digital Selective Calling (DSC) system for use in the Maritime Mobile Service.
ITU-R M.825-3	Characteristics of a Transponder system using DSC techniques for use with vessel traffic services and ship-to-ship identification.
IEC 62287-1	AIS Class B/CS (CSTDMA)
IEC 62320-1	AIS Base Station
IEC 62320-2	AIS Aids To Navigation Station (AtoN)
EN50081-1	EMC
EN50082-1	EMC
EN55022	class B – Radiated interference field strength
EN61000-4-2	Electrostatic discharge
EN61000-4-3	Radiated frequency electromagnetic field 80Mhz to 1000Mhz