artisan pickering 20-740 Series Manuel utilisateur
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1
20-740/745
RF MULTIPLEXER MODULE
pickering
USER MANUAL
Issue 2.10 Feb. 2008
© Copyright (2008) Pickering Interfaces Ltd. All Rights Reserved
Designed & Manufactured by:-
Pickering Interfaces Limited.
Stephenson Road
Clacton-on-Sea
Essex
CO15 4NL
England
Tel: 01255-428141
+44 1255-428141 (International)
Fax: 01255-475058
+44 1255-475058 (International)
Internet: www.pickering.co.uk
Model No. 20-740/745
RF Multiplexer Module
pickering
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2
20-740/745
RF MULTIPLEXER MODULE
pickering
HELP!!!
If you need assistance with your Pickering Interfaces Switching
System: Switching problems, Programming or Integration within your Test
System. – Please ring Pickering Interfaces and ask for “Technical
Support”.
Alternatively you may fax, email or connect to our Internet Web Site.
A full set of operating manuals, application notes and software drivers is
available on CD ROM.
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20-740/745
RF MULTIPLEXER MODULE
pickering
Contents
Section 1
20-740 R.F. Multiplexer Module................................................................................. 5
Section 2
20-745 R.F. Multiplexer Module................................................................................11
Section 3
Programming ........................................................................................................... 17
Section 4
Interconnecting R.F. Switching Modules.................................................................. 21
Section 5
Self Test................................................................................................................... 25
Section 6
Front Panel Layouts................................................................................................. 27
Section 7
Reconfiguring Driver Card to Your Application......................................................... 31
Section 8
Circuit Diagrams ...................................................................................................... 33
Section 9
Electrical, Environmental, Mechanical & Firmware Specifications .......................... 43
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4
20-740/745
RF MULTIPLEXER MODULE
pickering
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20-740/745
RF MULTIPLEXER MODULE
pickering
Section 1
20-740R.F. Multiplexer Module
1.1 Features
• Dual 8 to 1 Multiplexer with 2000MHz Bandwidth
• Configurable as 16 to 1 Multiplexer
• Available in both 50 and 75ΩVersions
• Choice of Front Panel Mounted Connectors: BNC, SMA and Type N
• Automatic Termination of all Unselected Inputs
• Ideal Building Block for Large R.F. Switching Networks
• 75ΩVersion Suitable for Telecoms and Video Switching
1.1.1 Description
The20-740seriesarearangeofhighperformancedual8to1RFBi-DirectionalMultiplexerswithabandwidthof2000MHz,
available in 50 or 75Ωversions. All non-selected input lines are terminated into a matched load. This module may also
be configured (via DIP switches) as a 16 to 1 multiplexer but with reduced r.f. performance.
Applications include routing high frequency signals to and from oscilloscopes, analysers, signal generators and
synthesizers,video/audioswitching,switchinghighfrequencylogicandmanyothersituationsinvolvingcoaxialswitching.
All inputs are automatically terminated into matched loads (50 or 75Ω).
Larger multiplexer/matrix switching networks may be constructed by interconnecting individual modules, see section 4
for further details.
1.1.2 Operation
This module is factory configured as a dual 8 to 1 multiplexer, see fig 1.2. Performance figures are given in table 1.1.
However it may also be configured (using dip switches) as a 16 to 1 multiplexer. Please note that the R.F. performance
for this configuration is to a slightly reduced specification (please refer to table 1.3 for further details).
Self-Test is performed both at power up and at any other time either manually or under program control. In the unlikely
event of relay failure the front panel will indicate a fault. The diagnosis - including the position of the suspect relay - will
be indicated using the DIAGNOSTIC? command.
This is a double height module and must be mounted into a double height (6U) case.
1.1.3 Front Panel
The module front panels are illustrated in Section 6, they include:
Status Display, 4 LED Indicators:-
Power LED. Connected to power system supply.
Active LED. On whenever one or more switches are closed. For a list of all active switches use the VIEW?
command.
Self-Test LED. Active when self-test in progress.
Error LED. Indicates that error found during self-test.
Self-Test Button. Press to initiate a self-test. While in progress the “Self-Test” LED will be on, if a failure is detected
thenthe“Error”LEDwillbesetonpermanently. UsetheDIAGNOSTIC? command to find the exact cause of any failure,
refer to section 5 for further details. NB: Self-Test button will only respond when module is inactive.
1.1.4 20-740 Module Model Numbers
The following table lists the standard options available with the RF multiplexer module:-
Model Number Configuration Connector Impedance
20-740-501 Dual 8 to 1 MUX BNC 50Ω
20-740-511 Dual 8 to 1 MUX SMA 50Ω
20-740-521 Dual 8 to 1 MUX Type N 50Ω
20-740-701 Dual 8 to 1 MUX BNC 75Ω
Further connector types may be available (particularly 75Ω), please contact factory for further details.
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20-740/745
RF MULTIPLEXER MODULE
pickering
Multiplexer Model
20-740-501 20-740-511 20-740-521 20-740-701
Impedance 50Ω50Ω50Ω75Ω
Max Frequency 1500MHz 2000MHz 2000MHz 1000MHz
Max Insertion Loss < 3dB < 3dB < 3dB < 3dB
VSWR < 1.8:1 < 1.6:1 < 1.6:1 < 1.8:1
(1.0GHz) (1.5GHz) (1.5GHz) (800MHz)
Isolation (at 2GHz) > 60dB > 60dB > 60dB > 60dB
Crosstalk (at 2GHz) > 55dB > 55dB > 55dB > 55dB
Terminating Resistors Yes Yes Yes Yes
Terminating Resistor
Max Power 0.25W 0.25W 0.25W 0.25W
.c.dV03Switch VoltagexaM
W01rewoPxaM
W51rewoPyrraCxaM
A5.0tnerruChctiwSxaM
m052<ecnatsiseRnOhtaP Ω(d.c.)
01>ecnatsiseRnOhtaP 8Ω(d.c.)
Sm02emiTgnihctiwS
Table 1.1 General Specification
(Dual 8 to 1 Multiplexer Mode)
Fig 1.1 8 to 1 Multiplexer Half of Model 20-740
1
50Ω
2
3
8
50Ω
50Ω
50Ω
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20-740/745
RF MULTIPLEXER MODULE
pickering
1.2 Dual 8 to 1 Multiplexer Mode
This is the standard configuration offering the user most flexibility, the module contains two separate 8 to 1 multiplexers,
whichmaybeoperatedindependentlyofoneanother. Theseunitsoffertheuseraveryflexiblebuildingblocktoconstruct
large R.F. switching systems, see Section 4 for further information.
1
50Ω
2
3
8
50Ω
50Ω
50Ω
Bank 1
1
50Ω
2
3
8
50Ω
50Ω
50Ω
Bank 2
Fig 1.2 Dual 8 to 1 Multiplexer Mode
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20-740/745
RF MULTIPLEXER MODULE
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-30 dB
-50 dB
-60 dB
-70 dB
-80 dB
-90 dB
-40 dB
500MHz
1000MHz
1500MHz
20-740 CROSSTALK
(8 to 1 and 16 to 1 modes)
2000MHz
Fig 1.5 Typical Crosstalk: 50ΩDual 8 to 1 Multiplexer Mode
-80 dB
-90 dB
-70 dB
-100 dB
500MHz
1000MHz
1500MHz
20-740 ISOLATION
(8 to 1 and 16 to 1 modes)
2000MHz
-40 dB
-50 dB
-60 dB
Fig 1.4 Typical Isolation: 50ΩDual 8 to 1 Multiplexer Mode
0 dB
-0.8 dB
-1.2 dB
-1.6 dB
-2.0 dB
-2.4 dB
-2.8 dB
-0.4 dB
500MHz
1000MHz
1500MHz
20-740 INSERTION LOSS
-3.2 dB
2000MHz
BNC
SMA
Fig 1.3 Typical Insertion Loss: 50ΩDual 8 to 1 Multiplexer Mode
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9
20-740/745
RF MULTIPLEXER MODULE
pickering
Fig 1.6 Typical VSWR: 50ΩDual 8 to 1 Multiplexer Mode
500MHz
1000MHz
1500MHz
20-740 VSWR (RETURN LOSS)
1.6
1.4
1.2
1.0
1.8
2000MHz
13dB
16dB
21dB
11dB
VSWR
Return Loss
26dB
SMA
BNC
90%
50%
10%
200pS
400pS
600pS
20-740 TYPICAL
STEP RESPONSE
380pS
Fig 1.7 Step Response: 50ΩDual 8 to 1 Multiplexer Mode
1.3 Single 16 to 1 Multiplexer Mode
This configuration provides a single 16 to 1 multiplexer, it operates in a similar manner to the 8 to 1 version. R.F.
performance is slightly reduced.
1
50Ω
2
3
50Ω
50Ω
16
50Ω
COM 1
Fig 1.8 Single 16 to 1 Multiplexer Mode
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