GE Medical Systems Information Technologies 340MT WMTS Transmitter User Manual TRANSMITTER
GE Medical Systems Information Technologies Inc. WMTS Transmitter TRANSMITTER
Contents
Ex 13c 18921273
ST600 TRANSMITTER
OPERATING INSTRUCTIONS
1892 1273
PL1 PL3
PL2
Figure 1 Physical Arrangement
These operating instructions are intended to provide the user with sufficient information
to install and operate the unit correctly.
The Wood and Douglas ST600 UHF transmitter is intended to fulfil the numerous OEM
applications by virtue of its highly flexible synthesized design approach, miniature size
and cost-effective performance. The transmitter can accept analogue and digital data
input and provides an RF output power of 125mW (adjustable down to 1mW, refer to
Sales Office for details).
INSTALLATION
NOTES: Pin spacing on all connectors is 2.54mm (0.1")
All dimensions in millimetres
For 7 pin connector version position is shown dotted.
TXE
CONNECTION
Connection to the ST600 transmitter is via PL1, PL2 and PL3 which plug directly into
the user's own equipment. The location of these connectors is shown in Figure 1 and
detailed in the following tables. (The unit is fitted with a 10 pin connector when parallel
frequency select facility is provided).
PIN NAME FUNCTION REMARKS
10V 0 volts common ground
2RF O/P RF output 50 ohms output
30V 0 volts common ground
Connector PL1 pin detail
PIN NAME FUNCTION REMARKS
1+VIN positive supply +6.0V to +15.0V
20V 0 volts common ground
Connector PL2 pin detail
PL1
PIN NAME FUNCTION REMARKS
10V 0 volts common ground
2transmit enable o/c = transmitter disabled
LOW <+0.5V = transmitter enabled
1k nom. internal pull-up to +Vin
3DIGITAL I/P data input 0/+3V to 0/+12V, DC-coupled
4ANALOGUE I/P data input > 50 mV p-p, AC-coupled
5+5VOUT + 5 volt supply output 50mA maximum current drain
6RS232 I/P serial programming
i/p RS232 level programming input
Note: Inverted TTL data can also be used.
If not used, leave not connected, or
connect to 0/V
70V 0 volts common ground
8RB1 parallel frequency
select internal pull-up to +5V, active low
9RB2
10 RB3
Connector PL3 pin detail
Figure 2 Programming Adaptor
FREQUENCY PROGRAMMING
The ST600 has an internal memory which can store up to 128 RF channels (16
randomly programmed and 112 sequentially programmed). The frequency and set-up
information is programmed into the unit by a synchronous PCM interface protocol.
The software supplied with the ST600 transmitter is the STSRn00.exe program. The
software can be run on a PC with the serial port connected to PL1 of the ST600
transmitter via a suitable adaptor as shown in Figure 2. If the read-back function is
desired, then PL1 pin 10 of the transmitter must be connected to pin 2 of the PC serial
port via a buffer circuit. A 1k pull-up resistor to +5V must also be provided as shown.
RUNNING THE SOFTWARE
1. Connect ST600 to a suitable supply and to the PC using the programming
adaptor.
2. Insert the STSRn00.exe disk into drive A and type:
A:STSRn00 <return>
3. The user is then prompted to enter the serial port number of his PC which is
used to communicate with the ST600 receiver. Enter 1 or 2.
4. Next there is a prompt to select STn00 or SRn00. Enter 1 for the ST600
5. Next is the prompt to select freq. range: 1 : ST100 (125 - 180MHz)
2 : ST/SR500 (400 - 650MHz)
3 : ST/SR800 (800 - 880MHz)
After the software has successfully loaded the main menu screen is displayed as shown
in Figure 3. The screen shows the default settings which are entered at factory set-up.
These default settings will be displayed whenever the STSRn00 software is run.
Please note that mouse operation is not supported with this program.
FREQUENCY STORAGE
The internal PIC processor allows for both random allocated frequencies and
sequential channels. The program displays the 16 (as channel 0/ to 15) random
channels on the main screen. If a sequential table is used then these are stored in
channels 16 to 127. These cannot be displayed or printed out.
To simplify the situation, the first 16 channels of the sequential table can be copied to
the random channel by pressing the F2 button.
The first 8 channels (0 to 7) can be selected using the serial interface or the parallel
interface, as described later.
STSRn00 Programmer v.1.0.02
Chan 0 458.5 MHz << Comparison freq. 12.5 KHz
Chan 1 458.5125 MHz Ref. (TCXO) freq. 12. 8 MHz
Chan 2 458.525 MHz Parallel channel select
Chan 3 458.5375 MHz
Chan 4 458.55 MHz
Chan 5 458.5625 MHz
Chan 6 458.575 MHz COMMANDS:
Chan 7 458.5875 MHz
Chan 8 458.6 MHz F2 :copy Ch 16-31 to Ch 0-15
Chan 9 458.6125 MHz F3 :change comparison frequency
Chan 10 458.625 MHz F4 :set parallel ch. mode
Chan 11 458.6375MHz F5 :read from unit
Chan 12 458.65 MHZ F6 :program unit
Chan 13 458.6625MHz F7 :program serial channel
Chan 14 458.675 MHz F12 :QUIT
Chan 15 458.6875MHz
Start table 458.7 MHz
Max. Freq. 458.95 MHz Sequential frequencies, Chan. 16 to 127
Table step 1 x 12.5 kHz
Figure 3
NOTES:
1. The reference (TXCO) frequency is not programmable.
2. The readback function (F5) reads the current settings from the unit into the PC.
3. Function F6 (program the unit) is only enabled after the read-back, (refer to
Figure 2). This function re-programs the unit connected.
4. A value for each parameters has to be entered.
5. Only channel 0 to 15 frequencies can be displayed by this software explicitly.
6. Sequential channel table is displayed as start, step and stop frequencies.
Serial channel selection
The unit defaults to serial channel selection whenever the software is run. Selecting
the F7 function key prompts the user to enter the new serial channel number which is
then displayed in ‘Serial channel selected’.
Parallel channel selection
To enable parallel channel selection mode press the F4 (Parallel channel mode)
function key, The screen then displays ‘parallel channel selected’.
Three inputs RB1, RB3 and RB3 applied via PL3 to pin 8, pin 9 and pin 10 respectively,
select the operating channel as shown in the following table.
CHANNEL SELECTION
PIN 10 PIN 9 PIN 8 CHANNEL
LOW LOW LOW 7
LOW LOW HIGH 6
LOW HIGH LOW 5
LOW HIGH HIGH 4
HIGH LOW LOW 3
HIGH LOW HIGH 2
HIGH HIGH LOW 1
HIGH HIGH HIGH 0
The logic levels are : LOW < 0.8V
HIGH > 2V or floating
Programming random channels
Random channels between 0 and 15 can be entered using the Up 8 and Down 9 arrow
keys and then entering the required operating frequency. The entered value must be
an integer multiple of comparison frequency otherwise an ‘invalid’ message is
displayed.
Programming sequential channels
To generate a new frequency table the following parameter values must be entered:
- start frequency
- the table step as a multiple of comparison frequency.
The maximum frequency is calculated from the start table frequency and the table step..
Therefore if the calculation exceeds the maximum frequency then this parameter will
be increased automatically.
When the frequency table has been generated the user then selects F6 to program the
unit, assuming the unit has been read before.
The function key F2 can be used to copy the contents of channel 16-31 to channel 0 -
15 to ease sequential programming.
Programming from customer equipment
In the event of a customer wishing to program the ST600 transmitter from his own
equipment then the following data sequence must be used allowing 5ms between the
characters in the data stream:
1200 baud, RS232 levels, 1 start bit - 8 bit data - no parity - 1 stop bit
40 (decimal 64) synchronising code
7 bit channel 0 - 127 (bit 7 = 0)
95 (decimal 149) confirmation byte
RANGE INFORMATION
The following table gives an indication of the typical ranges to be expected between a
transmitter and receiver that have simple end-fed dipole antennas.
The following assumptions have been made in the calculations:
line-of-sight between antennas
0dB gain for the transmitter and receiver antennas
0dB loss for connectors and cables between the antenna and the radio
connector
20dB fade and environmental margin
-100dBm received signal strength, allowing for digital and analogue signals
Range versus TX power
Frequency (MHz) Power (mW) Power (dBm) Range
(km) Miles
600 1mW 00.4 0.3
600 10mW 10 1.3 0.8
600 25mW 14 2.0 1.2
600 100mW 20 4.0 2.5
600 500mW 27 8.9 5.5
Wood and Douglas Ltd, Lattice House,
Baughurst Road, Tadley, Hampshire RG26 5LP 1892 1273
Tel: +44(0) 118 981 1444. Fax: +44(0) 118 981 1567 1.1/November2000
TECHNICAL SPECIFICATION
Frequency range :580 - 625 MHz
Switching bandwidth :8 MHz
Frequency stability :+/-2.5ppm
Number of RF channels :up to 128 (16 randomly programable, 112
sequential), serial select/reprogram, 1200 baud
RS232 or
1 of 8 parallel select
RF output power into 50 ohm :25mW adjustable to 1mW
:1 - 10 mW version available
Adjacent channel power :<200nW (-37dBm)
TX switching time :<60 mS
Modulation input
analogue :200 mV to 5V p-p AC coupled
digital :+3 to 12V square wave DC coupled
Frequency response :9Hz to 3kHz at -3dB
Deviation
25kHz channel spacing :+/-3kHz nom (±5kHz max)
20kHz channel spacing :+/-2.3kHz nom (±4kHz max)
12.5kHz channel spacing : +/-1.5kHz nom (±2.5kHz max)
Channel switching delay :<50mS across switching bandwidth
Channel spacing :25kHz
Modulation type :F3D
Spurious emissions
(conducted & radiated) :in accordance with ETS/CEPT specifications
Supply voltage :6 - 12V DC -ve earth
Supply current at 7.2V :<60mA for 25mW output
Interface connections :2 and 10 pin 0.1" header
RF connection :3 pin 0.1" header
Operating temperature :-30oC to +55oC
Storage temperature :-30oC to +70oC
Size overall :60 x 39 x 15 mm (2.36 x 1.53 x 0.59 inches)
Weight :30gm
Type approval :designed to meet ETS 300/220
General facilities :+5V output
:analogue and digital inputs
: