Racal Instruments 1260 VXI User manual

1260 VXI
SWITCHING CARD
1260-152 / 1260-172
17 CHANNEL SPDT HIGH
FREQUENCY PLUG-IN
PUBLICATION NO. 980824-152/172
RACAL INSTRUMENTS
United States
(Corporate Headquarters and Service Center)
4 Goodyear Street, Irvine, CA 92618
Tel: [phone]; Fax: [phone]
5730 Northwest Parkway Suite 700, San Antonio, TX 78249
Tel: [phone]; Fax: [phone]
Europe
(European Headquarters and Service Center)
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Tel: [phone]; Fax: [phone]
29-31 Cobham Road, Wimborne, Dorset BH21 7PF, United Kingdom
Tel: [phone]; Fax: [phone]
Via Milazzo 25, 20092 Cinisello B, Milan, Italy
Tel: [phone]; Fax: [phone]
Technologie Park, Friedrich Ebert Strasse, 51429 Bergisch Gladbach, Germany
Tel: [phone]; Fax: [phone]
[e-mail]
[e-mail]
[e-mail]
http://www.racalinstruments.com/
PUBLICATION DATE: July 8, 2003
Copyright 2000 by Racal Instruments, Inc. Printed in the United States of America. All rights reserved.
This book or parts thereof may not be reproduced in any form without written permission of the publisher.

THANK YOU FOR PURCHASING THIS RACAL INSTRUMENTS PRODUCT.
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WARRANTY STATEMENT
All Racal Instruments, Inc. products are designed and manufactured to exacting standards and in full
conformance to Racal’s ISO 9001 procedures.
This warranty does not apply to defects resulting from any modification(s) of any product or part without
Racal’s express written consent, or misuse of any product or part. The warranty also does not apply to fuses,
software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear,
such as mechanical relay life, or failure to follow instructions.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty of
merchantability or fitness for a particular use. The remedies provided herein are buyer’s sole and exclusive
remedies.
For the specific terms of your standard warranty, or optional extended warranty or service agreement, contact
your Racal customer service advisor. Please have the following information available to facilitate service.
1. Product serial number
2. Product model number
3. Your company and contact information
You may contact your customer service advisor by:
E-Mail: [e-mail]
Telephone: [phone] (USA)
[phone] (UK)
[phone] (Hong Kong)
Fax: [phone] (USA)
[phone] (UK)
[phone] (Hong Kong)

RETURN of PRODUCT
Authorization is required from Racal Instruments before you send us your product for service or calibration.
Call your nearest Racal Instruments support facility. A list is located on the last page of this manual. If you are
unsure where to call, contact Racal Instruments, Inc. Customer Support Department in Irvine, California, USA
at 1-800-722-3262 or 1-949-859-8999 or via fax at 1-949-859-7139. We can be reached at:
[e-mail].
PROPRIETARY NOTICE
This document and the technical data herein disclosed, are proprietary to Racal Instruments, and shall not,
without express written permission of Racal Instruments, be used, in whole or in part to solicit quotations from
a competitive source or used for manufacture by anyone other than Racal Instruments. The information herein
has been developed at private expense, and may only be used for operation and maintenance reference
purposes or for purposes of engineering evaluation and incorporation into technical specifications and other
documents which specify procurement of products from Racal Instruments.
DISCLAIMER
Buyer acknowledges and agrees that it is responsible for the operation of the goods purchased
and should ensure that they are used properly and in accordance with this handbook and any
other instructions provided by Seller. RII products are not specifically designed, manufactured or
intended to be used as parts, assemblies or components in planning, construction, maintenance or
operation of a nuclear facility, or in life support or safety critical applications in which the failure of
the RII product could create a situation where personal injury or death could occur. Should Buyer
purchase RII product for such unintended application, Buyer shall indemnify and hold RII, its
officers, employees, subsidiaries, affiliates and distributors harmless against all claims arising out
of a claim for personal injury or death associated with such unintended use.

FOR YOUR SAFETY
Before undertaking any troubleshooting, maintenance or exploratory procedure, read carefully the
WARNINGS and CAUTION notices.
This equipment contains voltage hazardous to
human life and safety, and is capable of
inflicting personal injury.
If this instrument is to be powered from the AC line (mains) through an
autotransformer, ensure the common connector is connected to the neutral (earth
pole) of the power supply.
Before operating the unit, ensure the conductor (green wire) is connected to the
ground (earth) conductor of the power outlet. Do not use a two-conductor extension
cord or a three-prong/two-prong adapter. This will defeat the protective feature of the
third conductor in the power cord.
Maintenance and calibration procedures sometimes call for operation of the unit with
power applied and protective covers removed. Read the procedures and heed
warnings to avoid “live” circuit points.
Before operating this instrument:
1. Ensure the proper fuse is in place for the power source to operate.
2. Ensure all other devices connected to or in proximity to this instrument are properly grounded or
connected to the protective third-wire earth ground.
If the instrument:
- fails to operate satisfactorily
- shows visible damage
- has been stored under unfavorable conditions
- has sustained stress
Do not operate until, performance is checked by qualified personnel.

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1260-152/172 User Manual
i
Table of Contents
Chapter 1...........................................................................................................................1-1
SPECIFICATIONS .......................................................................................................................1-1
Introduction ..............................................................................................................................1-1
Specifications ...........................................................................................................................1-2
Power Dissipation.....................................................................................................................1-3
About MTBF .............................................................................................................................1-4
Ordering Information ................................................................................................................1-5
Chapter 2...........................................................................................................................2-1
INSTALLATION INSTRUCTIONS................................................................................................2-1
Unpacking and Inspection ........................................................................................................2-1
Reshipment Instructions...........................................................................................................2-1
Installation ................................................................................................................................2-1
Module Configurations..............................................................................................................2-2
Front Panel Connectors ........................................................................................................2-2
Mating Connectors................................................................................................................2-4
Chapter 3...........................................................................................................................3-1
MODULE OPERATION................................................................................................................3-1
Setting the Module Address .....................................................................................................3-1
1256 Operation.........................................................................................................................3-1
VXI Operating Modes ...............................................................................................................3-1
Operating In VXI Message-Based Mode ..................................................................................3-3
Channel Descriptors For The 1260-152/172 .........................................................................3-3
Reply To The MOD:LIST? Command ...................................................................................3-4
Operating in VXI Register-Based Mode....................................................................................3-4
1260-152/172 Example Code ...............................................................................................3-8
Chapter 4...........................................................................................................................4-1
OPTIONAL ASSEMBLIES .......................................................................................................... 4-1

1260-152/172 User Manual
ii
Chapter 5...........................................................................................................................5-1
PRODUCT SUPPORT.................................................................................................................5-1
Product Support .......................................................................................................................5-1
Reshipment Instructions...........................................................................................................5-1
Support Offices ........................................................................................................................5-2

1260-152/172 User Manual
iii
List of Figures
Figure 1-1, 1260-152/172 ........................................................................................................... 1-1
Figure 2-1, Front-Panel Connector Pin Numbering ..................................................................... 2-2
Figure 2-2, Relay Diagram .......................................................................................................... 2-3
Figure 2-3, Block Diagram .......................................................................................................... 2-4
Figure 3-1, Message-Based Mode of Operation ......................................................................... 3-2
Figure 3-2, Register-Based Mode of Operation........................................................................... 3-2
List of Tables
Table 2-1, 1260-152/172 Front-Panel Connections..................................................................... 2-3
Table 3-1, Control Register Channel Assignments...................................................................... 3-6

1260-152/172 User Manual
iv
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1260-152/172 User Manual
Racal Instruments Ó2003 Module Specification 1-1
Chapter 1
SPECIFICATIONS
Introduction The 1260-152/172 is an RF plug-in switch module developed for a
variety of Racal Instruments platforms, such as the 1260-100
Adapt-a-Switch Carrier and the 1256 Switching System. The 1260-
152/172 includes the following features:
· Standard Adapt-a-SwitchÔand 1256 Switching System plug-in
design, providing for ease of replacement.
· Data-Driven embedded descriptor, allowing immediate use with
any Option-01T or 1256 switch controller, regardless of
firmware revision level.
· 17 High Frequency channels of SPDT switching.
Figure 1-1, 1260-152/172

1260-152/172 User Manual
Module Specification 1-2 Racal Instruments Ó2003
Specifications Characteristic Impedance
1260-152 50W
1260-172 75W
Bandwidth (-3dB)
1260-152 ³1.2GHz
1260-172 ³900 MHz
Insertion Loss, 500MHz
1260-152 £0.5dB to 300MHz
£0.75dB to 600MHz
£0.9dB to 900MHz
1260-172 £0.5dB to 300MHz
£1.5dB to 600MHz
VSWR
1260-152 to 900MHz £1.1:1 to 100MHz
£1.6:1 to 500Mz
£2.0:1 to 900MHz
1260-172 to 600MHz £1.5:1 to 100MHz
£2.1:1 to 500MHz
Isolation
500MHz ³85dB to 100MHz
³55dB to 600MHz
³45dB to 900MHz
Crosstalk
500 MHz £-80dB to 100MHz
£-55dB to 600MHz
£-50dB to 900MHz
Maximum Switching Voltage
AC 30 VAC peak
DC 30 VDC
Switching Current
AC 0.50 AAC peak
DC 0.50 A
Switching Power
AC 10VA
DC 10W
Path resistance < 1W
Insulation resistance > 109W
Relay Settling Time < 10ms

1260-152/172 User Manual
Racal Instruments Ó2003 Module Specification 1-3
Shock 30g, 11ms, ½ sine wave
Vibration 0.013 in. Pk-Pk, 5-55Hz
Bench Handling 4 in., 45°
Cooling See 1260-100 cooling data
Temperature
Operating 0°C to +55°C
Non-operating -40°C to +75°C
Relative Humidity 85% ±5% non-condensing at
< 30°C
Altitude
Operating 10,000 feet
Non-operating 15,000 feet
Power Requirements
+5VDC 150mA + 40mA per energized relay
(850mA Max.)
Weight 9oz. (0.26kg)
MTBF >300,000 hours (MIL-HDBK-217E)
Dimensions 4.5”H X 0.75”W X 9.5”D
Power
Dissipation
While the cooling of the Adapt-a-Switch carrier is dependent upon
the chassis into which it is installed, the carrier can normally
dissipate approximately 100 W. Care must be taken, then, in the
selection and loading of the plug-in modules used in the carrier. It
is not possible to fully load the carrier, energize every relay, and
run full power through every set of contacts, all at the same time.
In practice this situation would never occur.
To properly evaluate the power dissipation of the plug-in modules,
examine the path resistance, the current passing through the relay
contacts, the ambient temperature, and the number of relays
closed at any one time.
For example, if a 1260-152/172 module (containing 17 relays) has
all relays closed, passing a current of 0.5A, then:
Total power dissipation =
[(current)2* (path resistance) * 17 ] + (quiescent power)
By substituting the actual values:

1260-152/172 User Manual
Module Specification 1-4 Racal Instruments Ó2003
Total power dissipation =
[(0.5A)2* (1W) * 17] + (5W) = 9.25W at 55°C
This is acceptable power dissipation for an individual plug-in
module. If five additional modules are likewise loaded, then the
overall carrier dissipation is approximately 56 W, which is well
within the cooling available in any commercial VXIbus chassis. In
practice, rarely are more than 25% of the module’s relays
energized simultaneously, and rarely is full rated current run
through every path. In addition, the actual contact resistance is
typically one-half to one-fourth the specified maximum, and
temperatures are normally not at the rated maximum. The power
dissipated by each plug-in should be no more than 15 W if all six
slots are used simultaneously. Consult the Power Dissipation
Section of any other 1260 Adapt-a-Switch card manuals for
additional information.
Most users of a signal-type switch, such as the 1260-152/172,
switch no more than a few hundred milliamperes and are able to
energize all relays simultaneously, should they so desire.
Additionally, if fewer plug-in modules are used, more power may
be dissipated by the remaining cards. By using a chassis with high
cooling capacity, such as the Racal Instruments 1261B, almost
any configuration may be realized.
About MTBF The 1260-152/172 MTBF is >300,000 hours, calculated in
accordance with MIL-HDBK-217E, with the exception of the
electromechanical relays. Relays are excluded from this
calculation because relay life is strongly dependent upon operating
conditions. Factors affecting relay life expectancy are:
1. Switched voltage
2. Switched current
3. Switched power
4. Maximum switching capacity
5. Maximum rated carrying current
6. Load type (resistive, inductive, capacitive)
7. Switching repetition rate
8. Ambient temperature
The most important factor is the maximum switching capacity,
which is an interrelationship of maximum switching power,
maximum switching voltage and maximum switching current.
When a relay operates at a lower percentage of its maximum
switching capacity, its life expectancy is longer. The maximum
switching capacity specification is based on a resistive load, and

1260-152/172 User Manual
Racal Instruments Ó2003 Module Specification 1-5
must be further de-rated for inductive and capacitive loads.
For more details about the above life expectancy factors, refer to
the data sheet for the switch plug-in module.
The relays used on the 1260-152/172 plug-ins are Racal P/N’s
310157-001and 310289. The manufacturer’s specifications for
these relays are:
Life Expectancy
Mechanical 1,000,000 operations
Electrical 100,000 operations at 1W RF load
or 10mA 24VDC (resistive)
For additional relay specifications, refer to the relay manufacturer’s
data sheet.
Ordering
Information
Listed below are part numbers for both the 1260-152/172 switch
modules and available mating connector accessories. Each 1260-
152/172 uses two mating connectors, provided in the Shipping Kit.
Coax pins or cables must be ordered separately.
ITEM DESCRIPTION PART #
1260-152 Switch Module 50W17CH SPDT Coax Switch Module 407742-003
1260-172 Switch Module 75W17CH SPDT Coax Switch Module 407742-004
Shipping Kit Mating connectors (2) and manual 407653-152/172
Mating Connector Spare 26 Pin Housing 602221-126
Coax Pin Coax Pin 602221-903
Cable Assy. 2ft, 50WSingle Coax Cable w/connectors 407746-001
Cable Assy. 6ft, 50WSingle Coax Cable w/connectors 407746-003
Cable Assy. 12ft, 50WSingle Coax Cable w/connectors 407746-006
Cable Assy. 2ft, 75WSingle Coax Cable w/connectors 407747-001
Cable Assy. 6ft, 75WSingle Coax Cable w/connectors 407747-003
Cable Assy. 12ft, 75WSingle Coax Cable w/connectors 407747-006
Additional Manual User Manual 980824-152/172

1260-152/172 User Manual
Module Specification 1-6 Racal Instruments Ó2003
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1260-152/172 User Manual
Racal Instruments Ó2003 Installation Instructions 2-1
Chapter 2
INSTALLATION INSTRUCTIONS
Unpacking and
Inspection
1. Before unpacking the switching module, check the exterior of
the shipping carton for any signs of damage. All irregularities
should be noted on the shipping bill and reported.
CAUTION
ESD sensitive devices, open the instrument at an ESD
safe work station.
2. Remove the instrument from its carton, preserving the factory
packaging as much as possible.
3. Inspect the switching module for any defects or damage.
Immediately notify the carrier if any damage is apparent.
4. Have a qualified person check the instrument for safety before
use.
Reshipment
Instructions
1. Use the original packing material when returning the switching
module to Racal Instruments for servicing. The original
shipping carton and the instrument’s plastic foam will provide
the necessary support for safe reshipment.
2. If the original packing material is unavailable, wrap the
switching module in an ESD Shielding bag and use plastic
spray foam to surround and protect the instrument.
3. Reship in either the original or a new shipping carton.
Installation Installation of the 1260-152/172 Switching Module into a 1260-100
Carrier assembly is described in the Installation section of the
1260-100 Adapt-a-Switch Carrier Manual, Racal P/N 980824-100.
The installation of the 1260-152/172 Switching Module into a 1256
Chassis is described in the installation section of the 1256 Manual,
CAUTION
SENSI TIVE EL ECTRONIC DEVICES
DO NOT SHI P OR STORE NE AR
STRONG ELECTROSTATIC,
ELECTROMAGNETIC, MAGN ETIC OR
RADIOACTIVE FIELDS

1260-152/172 User Manual
Installation Instructions 2-2 Racal Instruments Ó2003
Racal P/N 980855
Module
Configurations
The 1260-152 and the 1260-172 are high frequency coaxial switch
modules each containing 17 channels of SPDT (single-pole
double-throw) switches. The 1260-152 uses 50Wcoaxial cable and
the 1260-172 uses 75Wcoaxial cable. Otherwise, the two modules
are functionally equivalent.
Front Panel
Connectors
The 1260-152/172 has two 26-pin front-panel connectors, labeled
J200 and J201. It is a 26-pin, MIL-DTL-28748 style, with shielded
coaxial pins. See Figure 2-1 for pin numbering. Table 2-1 shows
the mapping of channel numbers to connector pins. Information
about available mating connectors is provided immediately after
Table 2-1. See Figure 2-2 for a detail of the actual relay. See
Figure 2-3 for a block diagram of the 1260-152/172.
Figure 2-1, Front-Panel Connector Pin Numbering
AB
CD
EF
HJ
KL
MN
PR
ST
UV
WX
YZ
A
ABB
CC DD

1260-152/172 User Manual
Racal Instruments Ó2003 Installation Instructions 2-3
Table 2-1, 1260-152/172 Front-Panel Connections
Channel Number Common Normally
Closed
Normally
Open
0 J200-C J200-A J200-E
1 J200-K J200-H J200-M
2 J200-D J200-B J200-F
3 J200-L J200-J J200-N
4 J200-S J200-P J200-U
5 J200-Y J200-W J200-AA
6 J200-T J200-R J200-V
7 J200-Z J200-X J200-BB
8 J201-C J201-A J201-E
9 J201-K J201-H J201-M
10 J201-D J201-B J201-F
11 J201-L J201-J J201-N
12 J201-S J201-P J201-U
13 J201-Y J201-W J201-AA
14 J201-T J201-R J201-V
15 J201-Z J201-X J201-BB
16 J201-CC J200-DD J201-DD
Figure 2-2, Relay Diagram
Channel
0
1
16
NC
NO
NC
NO
NC
NO
COM
COM
COM

1260-152/172 User Manual
Installation Instructions 2-4 Racal Instruments Ó2003
Figure 2-3, Block Diagram
Mating
Connectors
Mating connector accessories are available:
26-Pin Connector, P/N 602221-126 and pins,
P/N 602221-903
The 26 pin connectors are provided as part of the 1260-152/172
Shipping Kit. Mating Pins or Cable assemblies must be ordered
separately. Refer to the Ordering Information section of this
manual.
If mating pins are used, the suggested hand tool for the Crimp
Pins is Racal Instruments P/N 991034. After cable attachment, the
pin is inserted into the housing and will snap into place, providing
positive retention. The corresponding pin removal tool is Racal
Instruments P/N 990922.
Vcc
Channels
Typical
Logic Core
Serial
to
Parallel
Converter
Input
Latches
8x3
Parallel
to
Serial
Converter
Relay
Module Driver
Output
Latches
8x3
Control
Readback
NO
Com
Gnd
26 PIN USER
INTERFACE
CONNECTORS
48 PIN CARD
INTERFACE
CONNECTOR
1260-152/172
BLOCK DIAGRAM
Control
Information
NC
NC
NO
COM