User`s guide

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RF Cable and Connector Suppliers

There are several suppliers for RF cables

and connectors for the switches/attenu-

ators used within the L4490A and L4491A

RF switch platforms. For convenience,

three of these suppliers are listed below:

Pasternack Enterprises, Inc.

http://www.pasternack.com

Micro-Coax

http://www.micro-coax.com

S. M. Electronics L.L.C.

http://www.smelectronics.us

Step 3

Switch/Attenuator Driver

Instruments and Platforms

For many applications, it is necessary

to locate the switching device as close as

possible to the DUT. Discrete switches and

attenuators are used for

this purpose. Optimum use of these

devices requires switch/attenuator drivers

that are speciﬁcally designed to provide

the following features:

• Digital Outputs to drive relay coils in

either pulsed or continuous drive mode,

• Digital Outputs that can drive switch

position feedback LEDs,

• Digital Inputs to sense the position of

the switches,

• Power distribution between the power

supply, switches, and control logic,

• Report generation that indicates how

often switches have been actuated.

These features are standard with the

Agilent 34945A and L4445A Microwave

Switch/Attenuator Drivers and the

L4490A/L4491A

RF Switch Platform.

The L4490A/L4491A RF Switch

Platforms

Also for dedicated or stand-alone

RF/Microwave switching applications

are the Agilent L4490A and L4491A RF

Switch Platforms. The 2U L4490A

and 4U L4491A allow the mounting of

switches and attenuators within a chassis.

Included with the L4490A and L4491A at

shipment are:

Item Description

5061-0701 LAN cross-over cable for

direct PC to L4490A/L4491A

connection.

L4490-61603 9-pin D-SUB extension cable

for supplying +24 V to the

34945EXT module.

34945EXT Extender module

(included in the L4490A and

L4491A chassis).

The internal conﬁguration and typical

system connections are shown in Figure 3.

The 34945A and L4445A

Microwave Switch/Attenuator

Drivers

For test systems requiring additional func-

tionality, consider the 34945A Microwave

Switch/Attenuator Driver module. The

34945A is a one-slot, plug-in module used

with the Agilent 34980A Multifunction

Switch/Measure Unit. The 34980A offers

a 6.5 digit DMM, and supports a host of

switching and control modules. LAN, GPIB,

and USB interfaces plus a full-feature front

panel are standard with the 34980A.

For dedicated or stand-alone RF/

Microwave switching applications, there

is the L4445A Microwave Switch/

Attenuator Driver instrument. The L4445A

is a 1U, ½-rack LXI (LAN eXtensions for

Instrumentation) version of the 34945A.

LXI is an instrumentation standard for

devices that use the Ethernet (LAN) as

their primary communications interface.

The 1U, ½-rack reference refers to the

L4445A’s physical size relative to standard

EIA rack cabinet dimensions.

Understanding what is included when

the 34945A or L4445A is ordered and

those accessories which must be ordered

separately, simpliﬁes the conﬁguration

process.

The following items are included with the

34945A and L4445A at shipment:

Item Description

5061-0701 LAN cross-over cable for

direct PC to 34945A/L4445A

connection.

8121-1289* 9-pin D-SUB extension cable

for supplying +24 V to the

34945EXT module.

34945EXT Extender module

(one is automatically added

to each 34945A and L4445A

ordered.)

8121-1339 CAT-5E RJ45 cable

(included with the 34945EXT

for communication between

extender modules).

Typical connections of these system

components are shown in Figure 2.

*Not available from Agilent. Can be purchased

locally or from the vendor L-COM (http://