Weinschel 8314 - Ward Davis Associates

Subsystems & Accessories
Model 8314-1
Model 8314-2
WLAN System Simulator
2.0 to 4.0 GHz
2.0 to 6.0 GHz
Simulate Connectivity over Distance & Speed
Data/Clk
Comm
Control
Interface
Controller
RS232
Trig
Status
8 TTL
Atten 1
Atten 2
Atten 4
Atten 3
Description
This specialized subsystem is used to simulate the connectivity between a mobile unit running along a line of 3 base
stations spaced from 250 to 1000 meters apart. The test
subsystem is able to simulate the variation of the RF signal
from the base stations reaching the mobile (as well as the
signal from the mobile reaching the base stations) when the
mobile is moving at speeds of up to 250 km/h. Serveral variations of this have been developed and produced.
The simulator attenuates the simulated Base Station signal
through three independent attenuators, then combines the
signals. Each attenuator has a dynamic range of 60 dB in 1
dB steps. The operation of the unit is via a RS232 interface,
ASCII commands can input parameters into the controller.
Upon receiving a trigger the controller executes the program to simulate the link loss to all three Base stations as
seen from the mobile transceiver.
BS 1
Frequency 3 or 6 GHz
BS 2
BS 3
1 Km
Mobile TX/RX Km/hr
10 meter
-40.00
-45.00
-50.00
-55.00
-60.00
-65.00
-70.00
-75.00
-80.00
-85.00
-90.00
-95.00
-100.00
3:1
Figure 1. RF Simulator Block Diagram
TRIGGER: The signal to begin a run can be either a hardware based trigger generated external from the controller,
or via RS232 command. If it is desirable to synchronize the
beginning of a train run with other external hardware/ software, a hardware based trigger is recommended. The
controller will also output a status signal to indicate that the
train is running. Once triggered, this signal is active for the
duration of the run.
OPERATOR CONTROLLED PARAMETERS: Using the
RS-232 control interface the operator has the ability to control the following parameters to set up any mobile unit
simulation:
o Base Station Positions (X meters, A station, B station,
C station, + offset from the track), 0-3000 meters for
station positions and 10-100 meters for offset from the
track.
o Mobile Transceiver Start/Stop Position
(x , y meters):
0-10, 000 meters.
o Mobile Velocity (Y km/hr): 0-250 km/hr
BS1
BS2
o Time Resolution (1,10,100,1000 mS or auto
to fill memory)
BS3
o Frequency: 2 to 6 GHz
o Ant Gain for Mobile and Base Station
0
15
30
45
60
75
90
105
120
135
Time, seconds
Calculated signal level from each Base Station.
150
o Transmitter Antenna Gain:
Receiver Antenna Gain:
-10 to +10 dB
-10 to +10 dB
o Loop Command: Used to simulate the train
running in a continuos loop.
(mobile unit moving at 100 km/hr)
For additional information on the Model 8314, visit our website @ www.aeroflex.com/AW/8413.htm
265
5305 Spectrum Drive, Frederick, MD 21703-7362 s TEL: 301-846-9222, 800-638-2048 s Fax: 301-846-9116
web: www.aeroflex.com/weinschel s email: [email protected]
Revision Date: 9/30/2012
Subsystems & Accessories
Specifications
SPECIFICATION
DESCRIPTION
Input Power Requirements
ac
100 to 240 Vac, 50/60 Hz, 50 Watts
Environmental
Operating Temperature
Storage Temperature:
Humidity:
Altitude:
0 to +50°C
67° to +167 °F (-55° to +75°C)
96%
40,000' (12,192M)
RS-232 Bus
Connector:
Signals:
Baud Rates:
Data Bits:
Handshaking:
Parity:
Indicators:
9-pin male D
TXD, RXD, RTS, CTS, DTR, GND
2400, 9600, 19200, and 38400
8
None, RTS/CTS, XON/XOFF
None, Odd, Even
Tx (Transmit) and Rx (Receive)
RF Characteristics
Attenuator (Qty 4):
Attenuation Range/Step Size:
Incremental Attenuation Accuracy:
Frequency:
Pin diode design
0-63.75 dB/ 0.25 dB step
+5% of selected value
Model 8314-1: 2.0 - 4.0 GHz
Model 8314-2: 2.0 - 6.0 GHz
3 inputs, 1 output
50 ohm
27 dB
+25 dBm
N Female
1.75:1 Target
>40 dB
Configuration:
Impedance:
Insertion Loss:
RF Input Power (P1dB):
RF Connector:
VSWR:
Port to Point Isolation:
1. RS-232 can be used with standard PC serial port for short and medium distances (up to approximately 50 ft).
Physical Dimensions
Aeroflex / Weinschel
266
5305 Spectrum Drive, Frederick, MD 21703-7362 s TEL: 301-846-9222, 800-638-2048 s Fax: 301-846-9116
web: www.aeroflex.com/weinschel s email: [email protected]
Revision Date: 9/30/2012