HP 85325A, 85326A Operating And Service Manual

HP 85325A R/Q/U/V/W Millimeter Subsystem

HP 85326A Millimeter-Wave Interface Kit

Operating and Service Manual

HP 85325A R/Q/U/V/W Millimeter

Subsystem

HP 85326A Millimeter-Wave Interface Kit

Operating and Service

Manual

HP part number: 85325-90061

Printed in USA

08 December 1998

Edition 2.0

Notice

The information contained in this document is subject to change without notice.

Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Hewlett-Packard assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Hewlett-Packard.

This document contains proprietary information which is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without prior written consent of Hewlett-Packard Company.

Restricted Rights Legend

Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical

Data and Computer Software clause at DFARS 252.227-7013 for DOD agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer

Software Restricted Rights clause at FAR 52.227-19 for other agencies.

Hewlett-Packard Company

Santa Rosa Systems Division

1400 Fountaingrove Parkway

Santa Rosa, CA 95403-1799, U.S.A.

© Copyright Hewlett-Packard Company 1998 iv HP 85325A Operating and Service Manual

What You’ll Find in This Manual…

Chapter 1

•

Installation

Chapter 2

•

Operation

Chapter 3

•

General Information

Chapter 4

•

Performance Verification

Chapter 5

•

Timebase Check and Adjustment

Chapter 6

•

Service

Appendix A

•

Using the HP 8340/41 in Your System

Appendix B

•

Connecting the Waveguide Properly

HP 85325A Operating and Service Manual v

Certification

Warranty

Warranty

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the

United States National Institute of Standards and Technology (NIST, formerly NBS), to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of other International Standards

Organization members.

This Hewlett-Packard system product is warranted against defects in materials and workmanship for a period corresponding to the individual warranty periods of its component products. Instruments are warranted for a period of one year. During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products that prove to be defective.

Warranty service for products installed by HP and certain other products designated by HP will be performed at Buyer’s facility at no charge within

HP service travel areas. Outside HP service travel areas, warranty service will be performed at Buyer’s facility only upon HP’s prior agreement and

Buyer shall pay HP’s round trip travel expenses. In all other areas, products must be returned to a service facility designated by HP.

For products returned to HP for warranty service, Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument. HP does not warrant that the operation of the instrument, or software, or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY. The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer,

Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP

SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES. THE REMEDIES PROVIDED HEREIN ARE

BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT BE

LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR vi HP 85325A Operating and Service Manual

Assistance

CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT,

TORT, OR ANY OTHER LEGAL THEORY.

Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products.

For assistance, call your local Hewlett-Packard Sales and Service Office

(refer to “Service and Support” on page viii).

HP 85325A Operating and Service Manual vii

Service and Support

Any adjustment, maintenance, or repair of this product must be performed by qualified personnel. Contact your customer engineer through your local

HP Service Center. You can find a list of HP Service Centers on the web at http://www.hp.com/go/tmdir

.

If you do not have access to the Internet, one of these HP centers can direct you to your nearest HP representative:

United States:

Canada:

Europe:

Japan:

Latin America:

Australia/New Zealand:

Asia-Pacific:

Hewlett-Packard Company

Test and Measurement Call Center

PO Box 4026

Englewood, CO 80155-4026

(800) 452 4844 (toll-free in US)

Hewlett-Packard Canada Ltd.

5150 Spectrum Way

Mississauga, Ontario L4W 5G1

(905) 206 4725

Hewlett-Packard European Marketing Centre

Postbox 999

1180 AZ Amstelveen

The Netherlands

(31 20) 547 9900

Hewlett-Packard Ltd.

Measurement Assistance Center

9-1, Takakura-Cho, Hachioji-Shi

Tokyo 192, Japan

(81) 426 56 7832

(81) 426 56 7840 (FAX)

Hewlett-Packard Latin American Region Headquarters

5200 Blue Lagoon Drive, 9th Floor

Miami, Florida 33126, U.S.A.

(305) 267 4245, (305) 267-4220

(305) 267 4288 (FAX)

Hewlett-Packard Australia Ltd.

31-41 Joseph Street

Blackburn, Victoria 3130

Australia

1 800 629 485 (Australia)

0800 738 378 (New Zealand)

(61 3) 9210 5489 (FAX)

Hewlett-Packard Asia Pacific Ltd.

17-21/F Shell Tower, Times Square

1 Matheson Street, Causeway Bay

Hong Kong

(852) 2599 7777

(852) 2506 9285 (FAX) viii HP 85325A Operating and Service Manual

Safety and Regulatory Information

WARNING

CAUTION

Review this product and related documentation to familiarize yourself with safety markings and instructions before you operate the instrument. This product has been designed and tested in accordance with international standards.

The WARNING notice denotes a hazard. It calls attention to a procedure, practice, or the like, that, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

The CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like, which, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met.

Instrument Markings

!

When you see this symbol on your instrument, you should refer to the instrument’s instruction manual for important information.

This symbol indicates hazardous voltages.

The laser radiation symbol is marked on products that have a laser output.

This symbol indicates that the instrument requires alternating current (ac) input.

The CE mark is a registered trademark of the European Community. If it is accompanied by a year, it indicates the year the design was proven.

The CSA mark is a registered trademark of the Canadian Standards Association.

1SM1-A This text indicates that the instrument is an Industrial Scientific and Medical Group 1

Class A product (CISPER 11, Clause 4).

This symbol indicates that the power line switch is ON.

This symbol indicates that the power line switch is OFF or in STANDBY position.

HP 85325A Operating and Service Manual ix

Safety Earth

Ground

This is a Safety Class I product (provided with a protective earthing terminal). An uninterruptible safety earth ground must be provided from the main power source to the product input wiring terminals, power cord, or supplied power cord set. Whenever it is likely that the protection has been impaired, the product must be made inoperative and secured against any unintended operation.

Before Applying Power

Verify that the product is configured to match the available main power source as described in the input power configuration instructions in this manual. If this product is to be powered by autotransformer, make sure the common terminal is connected to the neutral (grounded) side of the ac power supply.

x HP 85325A Operating and Service Manual

Declaration of Conformity

This is to certify that this product meets the radio frequency interference requirements of Directive FTZ 1046/1984. The German Bundespost has been notified that this equipment was put into circulation and has been granted the right to check the product type for compliance with these requirements.

If test and measurement equipment is operated with unshielded cables and/or used for measurements on open set-ups, the user must insure that under these operating conditions, the radio frequency interference limits are met at the border of his premises.

Model HP 85325A and

Model HP 85326A

Hiermit wird bescheinigt, dass dieses Gert/System in bereinstimmung mit den Bestimmungen von Postverfgung 1046/84 funkentst"rt ist.

Der Deutschen Bundespost wurde das Inverkehrbringen dieses

Gertes/Systems angezeight und die Berechtigung zur berprfung der Serie auf

Einhaltung der Bestimmungen eingerumt.

Zustzinformation fr Mess-und Testgerte:

Werden Mess- und Testgerte mit ungeschirmten Kabeln und/oder in offenen

Messaufbauten verwendet, so ist vom Betreiber sicherzustellen, dass die

Funk-Entst"rbestimmungen unter Betriebsbedingungen an seiner Grundstcksgrenze eingehalten werden.

HP 85325A Operating and Service Manual xi

Typeface Conventions

Italics

Instrument Display

[Keycap]

{Softkey}

User Entry

Path Name

Computer Display

•

Used to emphasize important information:

Use this software only with the HP xxxxxX system.

•

Used for the title of a publication:

Refer to the HP xxxxxX System-Level User’s Guide.

•

Used to indicate a variable:

Type

LOAD BIN

filename.

•

Used to show on-screen prompts and messages that you will see on the display of an instrument:

The HP xxxxxX will display the message

CAL1 SAVED

.

•

Used for labeled keys on the front panel of an instrument or on a computer keyboard:

Press [Return] .

•

Used for simulated keys that appear on an instrument display:

Press {Prior Menu} .

•

Used to indicate text that you will enter using the computer keyboard; text shown in this typeface must be typed exactly as printed:

Type

LOAD PARMFILE

•

Used for examples of programming code:

#endif // ifndef NO_CLASS

•

Used for a subdirectory name or file path:

Edit the file

usr/local/bin/sample.txt

•

Used to show messages, prompts, and window labels that appear on a computer monitor:

The Edit Parameters window will appear on the screen.

•

Used for menus, lists, dialog boxes, and button boxes on a computer monitor from which you make selections using the mouse or keyboard:

Double-click EXIT to quit the program.

xii HP 85325A Operating and Service Manual

Contents

1.

Installation

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Table 1-1. Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Figure 1-1. Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Using an HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Connecting the Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Optional 10 MHz Reference Connection . . . . . . . . . . . . . . . . . . . . . 1-4

Checking the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Receiver Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Setting Up the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Table 1-2. DENOM Value Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Table 1-3. Multiplier DENOM Table . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Mixer LO Power Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Initial Fixed Attenuator Value Selections . . . . . . . . . . . . . . . . . . . . . 1-8

Table 1-4. Selecting HP 85326A Reference and Test Attenuation . . 1-9

How to Use the Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Changing Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Figure 1-2. Reference Attenuator Installation . . . . . . . . . . . . . . . . 1-10

Figure 1-3. Test Attenuator Installation . . . . . . . . . . . . . . . . . . . . 1-10

Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Procedure 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Figure 1-4. Measuring LO Power from the Reference Module . . . 1-11

Figure 1-5. Reference Mixer Connections . . . . . . . . . . . . . . . . . . . 1-12

Figure 1-6. LO Power Measurement Point for Test Module . . . . . 1-13

Procedure 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Mixer Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Figure 1-7. Test Mixer Connections . . . . . . . . . . . . . . . . . . . . . . . 1-17

When Using an HP 8350 LO Source . . . . . . . . . . . . . . . . . . . . . . . 1-18

Saving the Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

Final Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

Figure 1-8. Leveling Control Cables . . . . . . . . . . . . . . . . . . . . . . . 1-20

Figure 1-9. HP 85325A/85326A Installation Block Diagram

(Coupled Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

Figure 1-10. HP 85325A/85326A Visual Installation Diagram

(Coupled Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

Figure 1-11. HP 85325A/85326A Installation Block Diagram

(Radiated Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

If Using an HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Connecting the Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

HP 85325A Operating and Service Manual Contents-i

Proper Torque for Coax Connections . . . . . . . . . . . . . . . . . . . . . . . 1-24

Table 1-5. Proper Connector Torque . . . . . . . . . . . . . . . . . . . . . . . 1-24

Turn ON AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

2.

Operation

Mixer Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Maximum RF Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Maximum LO Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Required LO Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Connector Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Proper Waveguide Connector Alignment . . . . . . . . . . . . . . . . . . . . . 2-2

3.

General Information

Chapter Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

About Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Table 3-1. R, Q, and U Band System Level Specifications . . . . . . . . 3-2

Table 3-2. V and W Band System Level Specifications . . . . . . . . . . . 3-3

MM-Wave Source and Mixer Characteristics . . . . . . . . . . . . . . . . . . . . . 3-4

Table 3-3. MM-Wave Source Information . . . . . . . . . . . . . . . . . . . . 3-4

Table 3-4. MM-Wave Mixer Information . . . . . . . . . . . . . . . . . . . . . 3-4

Supplied Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Table 3-5. Supplied Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Maximum RF Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Figure 3-1. L

S

, L

R

, and L

T

Cables . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Table 3-6. Maximum Cable Lengths (meters) . . . . . . . . . . . . . . . . . 3-6

Formulas for Cable Length Maximums . . . . . . . . . . . . . . . . . . . . . . 3-7

Figure 3-2. L

S

, L

R

, L

T

Cable Lengths, Example . . . . . . . . . . . . . . . . 3-7

4.

System Performance Verification

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Non-Banded Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Table 4-1. Recommended Test Equipment (non-banded) . . . . . . . . . 4-2

Band-Dependent Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Table 4-2. Recommended Test Equipment (banded) . . . . . . . . . . . . 4-3

Transmitter Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Receiver Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

First Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Second Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Setting Up The Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Table 4-3. Proper Connector Torque . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-1. Initial Equipment Configuration . . . . . . . . . . . . . . . . . . 4-8

Table 4-4. Switch Positions for Analyzer Mode . . . . . . . . . . . . . . . . 4-9

Install the Performance Verification Software Onto a Hard Disk . . . . . 4-10

Copy Onto a Hard Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Starting The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Contents-ii HP 85325A Operating and Service Manual

Softkey Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Loading the Program From a Hard Disk . . . . . . . . . . . . . . . . . . . . 4-11

Running the Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Helpful Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Detailed Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

CW Frequency Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Maximum Leveled Power Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

RF to IF Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

IF Noise Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Channel Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

5.

Synthesized LO Source Timebase Check and Adjustment

Description and Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Table 5-1. Suggested Adjustment Interval for LO Sources . . . . . . . 5-1

Figure 5-1. LO Source 10 MHz Timebase Adjustment Setup . . . . . 5-2

Figure 5-2. 10 MHz Standard Adjustment Location . . . . . . . . . . . . 5-3

6.

Service

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Figure 6-1. System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Transmitter Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

The Purpose of Each Device in the Transmitter Section . . . . . . 6-3

Allowable HP-IB Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Extender Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Receiver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Purpose of Each Device in the Receiver Section . . . . . . . . . . . . 6-4

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Non-Banded Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Table 6-1. Recommended Test Equipment (Non-Banded) . . . . . . . . 6-7

Band-Dependent Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Table 6-2. Recommended Test Equipment (Banded) . . . . . . . . . . . . 6-8

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Special 5/16 Inch Wrench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

How to Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

MM-Wave Module Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

Test Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

Table 6-3. Test Module (85326-60001)Parts . . . . . . . . . . . . . . . . . 6-11

Figure 6-2. HP 85326A (85326-60001) . . . . . . . . . . . . . . . . . . . . 6-11

When Replacing a Diplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

Reference Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

Table 6-4. Reference Module (85326-60002)Parts . . . . . . . . . . . . 6-12

Figure 6-3. HP 85356A (85326-60002) . . . . . . . . . . . . . . . . . . . . 6-12

Band-Related Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

HP 85325A Operating and Service Manual Contents-iii

Table 6-5. Parts Supplied in Specific Bands . . . . . . . . . . . . . . . . . . 6-13

Repairing a Mixer or Source Module . . . . . . . . . . . . . . . . . . . . 6-13

Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Table 6-6. Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

7.

Using the HP 8340/41 in Your System

Figure A-1. HP 8340/41 RF Source . . . . . . . . . . . . . . . . . . . . . . . . . A-1

8.

Connecting the Waveguide Properly

Handling and Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Connecting WR-62 Waveguide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Precision Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Figure B-1. Alignment Holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Aligning Two Precision Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Figure B-2. Inserting Slip Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Figure B-3. Align Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Figure B-4. Inspect Flange Connections . . . . . . . . . . . . . . . . . . . . . B-4

Aligning Precision and Non-Precision Flanges . . . . . . . . . . . . . . . . B-5

Figure B-5. Align Pin with Head . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

Figure B-6. Tighten Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

Contents-iv HP 85325A Operating and Service Manual

1

WARNING

CAUTION

Installation

Installation

This chapter explains how to:

• set up the equipment

• adjust LO power levels

• check mixer operation

• perform final installation

This equipment is capable of radiating millimeter-wave energy from the end of an unterminated waveguide. Do not look directly into the open end of any waveguide when it is connected to a source of millimeter-wave energy.

Take precautions consistent with ANSI C95.1 - 1982, a study performed by the

American National Standards Institute that sets limits for human exposure to microwave and millimeter-wave energy. Copies of this publication are available from:

American National Standards Institute

11 West 42 Street

New York, New York 10036

Telephone: (212) 642-4900

WEB site: www.ansi.org

Do not connect LO power to the HP 11970 mixers until you adjust the LO

power in “Mixer LO Power Level Adjustment” on page 1-8. If you connect

LO power before adjusting it you could permanently damage the mixers.

HP 85325A Operating and Service Manual 1-1

Installation

Required Equipment

Required Equipment

The following equipment is required when performing installation.

Table 1-1 Equipment Required

Item

Power Meter

Power Sensor

5/16 inch Wrench

T-10 Torx Driver

1/4 inch Wrench

3/16 inch Wrench

3/32 Hex Ball Driver

Adapter, 3.5 mm (f) to (f)

1

1

1

1

1

1

Qty

1

1

HP Model or Part Number

HP 436, 437, or 438

HP 8485A

08555-20097 (supplied with HP 85326A)





1250-1749

1-2 HP 85325A Operating and Service Manual

Initial Setup

Connect the equipment as shown in Figure 1-1.

Installation

Initial Setup

NOTE

Figure 1-1 Initial Setup

It is important that you connect the mm-wave head to the RF source (as

shown in Figure 1-1) before using the procedures in this manual. The

mm-wave head configures the RF source so it will accept mm-wave band start and stop frequency commands from the receiver.

If you are using an HP 8340/41 as an RF source, refer to Appendix A for setup information.

Using an HP 8340/41

RF Source

Connecting the

Waveguide

When connecting the waveguide, refer to Appendix B, “Connecting the

Waveguide Properly.” Use the waveguide accessory hardware kit when connecting the waveguide components.


Installation

Initial Setup

Optional 10 MHz

Reference Connection

The 10 MHz reference connection (see Figure 1-1 on page 1-3) between the

RF and LO sources locks the signal frequency of the two sources together.

When the sources are separated by a long distance, make sure the 10 MHz signal is at least -17 dBm or greater at the 10 MHz REF INPUT. The

10 MHz REF OUTPUT produces 0 dBm.

Checking the Signal

You can check to see if a 10 MHz signal is reaching the destination source as follows:

NOTE This procedure assumes at least one source has a front panel.

Procedure

1. Set up the sources so that they are not under HP 8530 control.

2. Connect the 10 MHz cable between the LO and RF source 10 MHz REF jacks. Make sure you use the 10 MHz REF IN on the source with a front panel. (This will be called the receiving unit.)

3. Preset the sources.

4. If

EXT REF is displayed on the bottom-left of the receiving units display, the signal is satisfactory.


NOTE

Setting Up the

Receiver

NOTE

Installation

Receiver Settings


[[Brackets] indicate a front-panel key or on a computer key board.

{Braces} indicate a display softkey selection.

1. Turn ON the RF source. Make sure it is set to HP-IB address 19.

2. Turn ON the LO source. Make sure it is set to HP-IB address 18.

3. Turn ON the following components in the order shown: a.

RF power amplifier (if used) b.

HP 85309A c.

Receiver

If your LO source is an HP 8350, it is normal for

CAUTION, NO IF FOUND

or

CAUTION: SOURCE 1 FAILURE RF UNLOCKED to appear on the screen at this time. The message will go away later, when you connect the reference mixer.

4. Press:

[USER PRESET]

[SYSTEM]

{HPIB ADDRESSES}

{SOURCE #2} [1][8] [x1] (sets address of the LO source)

5. If using an HP 8510, press: {TEST SET} [3][1] [x1]

6. If using an HP 8530, press: {CONVERTER} {SET ADDRESS} [3][1] [x1]

Press:

[RECALL] {MORE} {FACTORY PRESET}

Press:

[SYSTEM] {MORE} {SYSTEM PHASELOCK} a.

If using a synthesized LO, select {LOCK TYPE: NONE} .

b.

If using an HP 8350 source, select {LOCK TYPE: EXTERNAL} .


NOTE I

Installation


7. Press:

[PRIOR MENU]

{POWER LEVELING}

{SOURCE 1: MM MODULE LEVELING}

In some setups, {SOURCE 1: MM MODULE LEVELING} is not appropriate. Select

{SOURCE 1: INTERNAL} if:

❍

❍

Using an HP 8510B

Using an HP 8510C with firmware Revision 6.1 or lower.

❍

❍

The source interface cable is not connected to the HP 836xx.

Using an HP 8340/41, and it is not connected as shown in

Appendix A.

8. Press:

{SOURCE 2: INTERNAL}

[PRIOR MENU]

{EDIT MULT. SRC.}

9. Press:

{DEFINE: SOURCE #1}

{MULTIPLIER NUMER.} [1] [x1]

10. Press {MULTIPLIER DENOM.} and do one of the following: a.

If source 1 (the RF source) is an HP 836xx, and the source interface cable is connected: press [1] [x1] b.

If source 1 is an HP 836xx and the source interface cable is not connected, enter the DENOM. value for your band (shown in

Table 1-2), remember to terminate with

[x1]:

Table 1-2 DENOM Value Table

U

V

W

Band

R

Q

3

4

6

DENOM Value

2

3

40

50

75

Start Freq (GHz) Stop Freq (GHz)

26.5

33

40

50

60

75

110


Installation

Receiver Settings c.

If source 1 is an HP 8340/41, enter the DENOM value (in Table 1-2 on page 1-6) for your band. Terminate with

[x1] .

11. Press:

{OFFSET FREQUENCY} [0] [x1]

{DONE}

12. Press:

{DEFINE: SOURCE #2}

{MULTIPLIER NUMER.} [1] [x1]

13. Press {MULTIPLIER DENOM.}

, and enter the value (shown in Table 1-3),

remember to terminate with [x1]:

Table 1-3 Multiplier DENOM Table

V

W

Q

U

Band

R

14

18

10

10

DENOM Value

8

50

75

33

40

Start Freq (GHz) Stop Freq (GHz)

26.5

40

50

60

75

110

14. Press:

{OFFSET FREQUENCY} [2][0] [MHz]

{DONE}

15. Press: {RECEIVER}{CONSTANT FREQUENCY} [2][0] [MHz]

16. Press: {DONE} {MULT. SRC: ON / SAVE}

17. Press STIMULUS [MENU] {POWER MENU}

{POWER SOURCE 1} [0] [x1]

{POWER SOURCE 2} [1][0] [x1]

[PRIOR MENU] {STEP}

18. Enter the start and stop frequencies using the [START] and [STOP] keys. Use

the start/stop frequencies shown in Table 1-2 for your specific mixer.


NOTE

CAUTION

Initial Setup

Initial Fixed

Attenuator Value

Selections

NOTE

Installation

Mixer LO Power Level Adjustment


[Brackets] indicate a front-panel key or a computer key board.


It is critical that you set LO power before connecting the HP 11970 mixers.

1. If using an HP 8530A, press:

[DOMAIN] {FREQUENCY}

2. Place the receiver in the single point (CW) mode by pressing:

STIMULUS [MENU] , {SINGLE POINT} .

3. Press [CENTER] and enter the lowest frequency available in your millimeter band.

The internal fixed attenuator value in the reference module is set so the mixer LO input port is not damaged by excessive power (maximum power for an HP 11970x is +20 dB). The maximum unleveled power is possible if the ALC loop of the HP 85309A and reference module is broken.

To check what the maximum unleveled power level is:

1. Disconnect the detector voltage feedback cable at the reference module

while monitoring the power level as shown in Figure 1-4 on page 1-11.

Perform the test within the frequency range of operation.

2. Install an attenuator in the reference module which has a value that

keeps the power level below your mixers damage level. (See Figure 1-2 on page 1-10)

The attenuator values shown in Table 1-4 on page 1-9 can be used if

HP 85381A RF cable assemblies are used.

3. Determine the minimum attenuator value for the 85326-60001 (test

module), and the 85326-60002 (reference module) using Table 1-4 on page 1-9.


Installation


Table 1-4 Selecting HP 85326A Reference and Test Attenuation

Length of LO Cable from

HP 85309A

1

to Reference Module

2

(L

V

Cable)

9 meters

8 meters

7 meters

Reference Module

Attenuation Required

0 dB

1 dB

1 dB

6 meters

5 meters

4 meters

1.5 to 3 meters

2 dB

2 dB

3 dB

3 dB

1. Assumes use of HP 85381A cable type.

2. A standard HP 85325A system uses 8, 6, or 4 meter cables.

Test Module Attenuation

Required

0 dB

0 dB

1 dB

1 dB

2 dB

2 dB

3 dB

How to Use the Chart

Determine the length of the LO cable that goes from the HP 85309A REF

LO OUT connector to the reference module's LO IN connector.

Look the length up in Table 1-4 to find the appropriate amount of attenuation

for the test and reference modules.

HP cables have label sleeves marked C04, C06, or C08. The number represents the length of the cable in meters. Standard systems use LO cables that are 4, 6, or 8 meters in length. Other lengths are not standard but might apply to special systems.

Changing Attenuation

Procedure

1. Use the supplied #10 TORX driver to remove the screws securing the module covers.

2. Observe the attenuator that is connected to the reformable cable. Hold the body of this attenuator in place with one of the supplied 5/16 inch wrenches.

3. Use the other 5/16 inch wrench to disconnect the reformable cable.

4. Remove other attenuators, as required, using this method.

5. Place unused attenuators in the holders (see Figure 1-2 and Figure 1-3 on page 1-10.)

6. Replace the reformable cable.


Installation


7. Make sure the connections inside the module are secure before replacing the module covers (8 to 10 in-lbs of torque is recommended).

8. Replace the module covers and screws. Tighten the screws until they are snug. Do not over-tighten.

Figure 1-2 Reference Attenuator Installation

Figure 1-3 Test Attenuator Installation


Installation

Adjustment Procedures


NOTE [Brackets] indicate a front-panel key on a computer keyboard.


LO power must be adjusted before connecting the HP 85325A mixers to avoid damaging them. Use Procedure 1 or 2, as appropriate:

•

Procedure 1

Use this procedure if you are only going to use the HP 85325A/HP

85325A mixer configuration.

•

Procedure 2

Use this procedure if you are going to reconfigure your system between

HP 85325A/HP 85326A mixers and other mixer types. Procedure 2 eliminates the need to readjust LO power when switching between the

HP 85325A and other mixers.

Procedure 1

This procedure applies to systems that only use HP 85325A mixers.

Initial Setup

1. Zero and calibrate the power meter (refer to your power meter manual).

2. Determine the power sensor calibration factor at 4 GHz, and set the power meter accordingly.

3. Connect the power meter as shown in Figure 1-4.

Figure 1-4 Measuring LO Power from the Reference Module

4. Measure the power output of the reference module as shown in

Figure 1-4. Be sure to measure power at the end of the LO cable.


Installation


Adjust the LO Power to the Reference Mixer

1. Adjust the HP 85309A front panel LO POWER ADJUST control until the power meter reads between 17 and 17.8 dBm. The “LO POWER

OUT OF RANGE” light should be off.

2. Note the reading of the HP 85309A display and write it down here:

HP 85326A DETECTOR VOLTAGE SETTING:______________ millivolts

If the LO power adjust setting is ever changed, you can return to the appropriate power level for the millimeter system by referring to this setting.

To return to the original power level, Turn the LO POWER ADJUST knob until the voltage reading matches the value written above.

To find the maximum unleveled power, disconnect the detector voltage feedback cable at the reference module while monitoring the power level as

shown in Figure 1-4 on page 1-11. Remember to perform the test within the

frequency range of operation.

NOTE When performing the following step, connect the LO, IF, and detector voltage cables to the reference MODULE first, then connect cables to the mixer. This lowers the risk of electrostatic damage to the mixers.

3. Connect the reference mixer to the reference module and directional

coupler, refer to Figure 1-5.

The warning beeper should now stop.

4. Press [ENTRY OFF] to remove the error message from the receiver display.

Figure 1-5 Reference Mixer Connections


Installation


Adjust the LO Power to the Test Mixer

1. Zero the power meter.

2. Measure the LO power output of the test module as shown in Figure 1-6.

Figure 1-6 LO Power Measurement Point for Test Module

3. The LO power should be between +16 and +17 dBm. If the LO power is outside this range, you must change the amount of attenuation inside the test module. This is accomplished by adding or removing attenuators inside the module.

Use various combinations of the 1, 2, and 4 dB attenuators to adjust the

LO power to the required range.

4. If you have more than one test module, repeat power measurement for each test channel module as explained above.


Installation


Procedure 2

This procedure applies to systems that use HP 85320A/B mixers, in addition to the HP 85325A.

Initial Setup

1. Refer to the detector voltage label on the HP 85320B reference mixer.

Set the HP 85309A “LO POWER ADJUST” control to match this value.

You do not need to connect the HP 85320B mixer to the system.

2. Zero and calibrate the power meter.

3. Determine the power sensor calibration factor at 4 GHz, and set the power meter accordingly.

4. Connect the power sensor to the LO output of the HP 85326A reference

module (refer to Figure 1-4 on page 1-11). Be sure to connect the power

sensor to the end of the LO cable.

Checking the Reference

LO Power

1. Measure the power output of the reference module.

a.

If measured power is between 15 and 17.5 dBm, no adjustment is necessary. Go directly to the Adjusting LO Power to the Test Mixer

section on page 1-15.

b.

If the measured level is outside of the above range, you will have to change the LO power whenever you switch between HP 85320A/B and HP 85325A mixer systems. For HP 85320A/B mixers, refer to the HP 85320A/B Mixer Modules User's Guide

Since you must set the LO power separately for each type of mixer, adjust the LO power for the millimeter-wave mixers at this time. To do this, perform Procedure 1, starting at “Adjusting LO Power to the

Reference Mixer.” on page 1-12.

2. Adjust the HP 85309A front panel LO POWER ADJUST control until the power meter reads between 17 and 17.8 dBm. The “LO POWER

OUT OF RANGE” light should be off.

3. Note the reading of the HP 85309A display and write it down here:

HP 85326/85320 DETECTOR VOLTAGE SETTING: ________ millivolts.

If the LO POWER ADJUST setting is ever changed, you can return to the appropriate power level for the millimeter system by referring to this setting.

To return to the original power level, Turn the LO POWER ADJUST knob until the voltage reading matches the value written above.

NOTE When performing the following step, connect the LO, IF, and detector voltage cables to the reference module first, then connect cables to the mixer.

This lowers the risk of electrostatic damage to the mixers.


Installation


4. Connect the reference mixer to the reference module and directional

coupler, refer to Figure 1-5 on page 1-12. The warning beeper on the

receiver should stop.

5. Press [ENTRY OFF] to remove the error message from the receiver display.

Adjust the LO Power to the Test Mixer

1. Measure the LO power output of the test module as shown in Figure 1-6 on page 1-13.

2. Look up the power level (see below) and perform the corresponding action.

If power is:

❍

Less than 14.75 dBm: Reduce the amount of attenuation in the test module until power is between 14.75 and 16.25 dBm.

NOTE If you have removed all attenuators from the test module, and power is still less than 14.75 dBm, this means that you cannot switch between the

HP 85325A mixers and your other mixers without readjusting LO power

each time. Perform “Procedure 1" on page 1-11 to adjust LO power for the

HP 85325A mixers. To adjust LO power for the other mixers, refer to the operating manual for those mixers.

❍

14.75 to 16.25 dBm: Proper LO power, no further adjustment is needed.

❍

Greater than 16.25 dBm: Add attenuation inside the test module until power is between 15 and 16.25 dBm.

3. If you have more than one test module, repeat the power measurement

(the previous two steps) for each test module.


NOTE

NOTE

Installation

Mixer Operational Check


[Brackets] indicate a front-panel key or computer keyboard.


When installing the mixers, connect the 3.5 mm cables to the test/reference modules before connecting them to the mixers. This will minimize the danger of an electrostatic discharge damaging the mixers.

1. Make sure the equipment is connected as shown in Figure 1-5 on page 1-12.

2. Press:

STIMULUS [MENU] {STEP}

3. Enter the start and stop frequencies of your millimeter band.

4. Make sure averaging is OFF by pressing:

RESPONSE [MENU] {AVERAGING OFF}

5. Measure the a1 input as follows:

If using an HP 8510, press:

PARAMETER [MENU] {USER 1 a1}

If using an HP 8530, press:

PARAMETER [MENU]

{SERVICE PARAMETERS}

{SERVICE 1 a1}

The signal you are measuring is from the coupled arm of the directional coupler.

6. Set the display reference value so the trace is centered vertically:

Press [REF VALUE] and turn the rotary knob.

7. Write down the reference value, you will need it later in this procedure:

REF VALUE = ____________________________

8. Set display scale to 1 dB/division, press:

[SCALE] [1] [x1]


NOTE

Installation


9. Make sure the signal is at anticipated levels. The coupled arm attenuates the output of the HP 8355xA by 30 dB (this can vary depending on the type of coupler used). Power flatness should be approximately +/-3 dB across the band.

10. Press:

[DISPLAY]

{DATA -> MEMORY}

11. Disconnect the reference mixer from the coupled arm of the directional

coupler. Put the test mixer in its place, as shown in Figure 1-7.

If your system has more than one test channel, connect the coupled arm to the first test channel (TEST 1).

12. Connect the Test LO and Test IF cables to the test module first, then to the test mixer.

NOTE

Figure 1-7 Test Mixer Connections

Perform steps 13 through 18 ONLY if using a synthesized LO source.

Proceed to “When Using an HP 8350 LO Source” on page 1-18 if you have

an HP 8350 LO source.


When Using an

HP 8350 LO Source

Installation


13. Determine which receiver input has the test signal connected to it (b1, b2, or a2).

14. Measure that input using the USER softkeys (on HP 8510) or SERVICE

PARAMETER softkeys (on HP 8530).

15. Press:

[DISPLAY]

{SELECT DEFAULTS}

{DEFAULT to MEMORY: 1}

{DATA and MEMORY}

Adjust the display reference so the two traces are centered vertically.

Refer to the value you wrote down in Step 7.

16. Set display scale to 1 dB/division.

17. Make sure the two signals are within 3 dB of each other.

18. If your system has more than one test channel, check each one in the same way.

Perform the following steps ONLY if using an HP 8350 LO source:

1. Press {DATA and MEMORY}

2. On the rear panel of the HP 85309A: a.

Disconnect the green (b2) wire from the TEST IF OUT connector.

b.

Move the brown (a1) cable from the REFERENCE IF OUT connector to the TEST IF OUT connector.

3. Make sure the two displayed traces are within 3 dB of each other. (This step is required so the receiver can phase lock.)

4. If your system has a second test channel: a.

Move the red (b1) wire to the TEST IF OUT connector.

b.

Make sure the two displayed traces are within 3 dB of each other.

5. If your system has a third test channel: a.

Move the yellow (a2) wire to the TEST IF OUT connector.

b.

Make sure the two displayed traces are within 3 dB of each other.

6. Move the a1 and b2 (and possibly b1 and a2) input lines back to their original configuration.


NOTE

Installation

Saving the Setup

Saving the Setup

[Brackets] indicate a front-panel key or a computer keyboard.


Press [SAVE] {USER PRESET 8} to save the current instrument setup. Whenever you press [USER PRESET] or turn the receiver on, the proper settings for this system will be recalled.


Installation

Final Installation


This procedure assumes that the other components of the antenna measurement system are already connected. Refer to the installation instructions for the receiver or HP 85310A if necessary.

CAUTION

Figure 1-8 Leveling Control Cables

If you disconnect the detector voltage cable (while the LO source is on), LO power will go to maximum. This will damage the millimeter-wave mixers as soon as they are connected.

If you disconnect the LO signal cable, the LO power will go to maximum while the HP 85309A tries to send the appropriate amount of power to the mixers. If you then reconnect the LO cable, the LO power to any connected mixer will initially be at damage levels. The HP 85309A will detect the high

LO power and reduce it, but the mixers could be damaged before power is reduced.

Remember that the HP 85309A sends the same LO power to both mixers. If high LO power occurs then both millimeter-wave mixers may be destroyed.

Do not connect LO power to the HP 11970 mixers until you adjust the LO

power. Refer to the “Mixer LO Power Level Adjustment” on page 1-8 If you

connect LO power before adjusting it you could permanently damage the mixers.


Installation


Procedure

1. Move all system components to their final location.

2. Connect the system using one of these methods: a.

If you are using a coupled reference channel, connect the system as

shown in Figure 1-9 and Figure 1-10 on page 1-22.

b.

If you are using a radiated reference, connect as shown in

Figure 1-11 on page 1-23.

Refer to Figure 1-1 on page 1-3 for system-level connections.

Figure 1-9 HP 85325A/85326A Installation Block Diagram (Coupled Reference)


Installation


Figure 1-10 HP 85325A/85326A Visual Installation Diagram (Coupled Reference)


Installation


Connecting the

Waveguide

Figure 1-11 HP 85325A/85326A Installation Block Diagram (Radiated Reference)

If Using an HP 8340/41

RF Source

If you are using an HP 8340/41 as an RF source, refer to Appendix A for setup information.

When connecting a waveguide, refer to Appendix B, “Connecting the

Waveguide Properly.” Use the Waveguide Accessory Hardware Kit when connecting the waveguide components.


Proper Torque for

Coax Connections

Installation


The coax RF connectors in the setup must be properly torqued or the system will not provide its best performance. Proper connection torque also keeps moisture out the connectors, and eliminates radio frequency interference

(RFI) from the connector interface. The amount of torque required depends

on the type of connector. Table 1-5 lists the proper torque values. Do not

over-tighten connectors.

Table 1-5 Proper Connector Torque

Connector

Type-N

3.5 mm

SMA

2.4 mm

9.2

5.7

9.2

Torque / cm-kg Torque / N-cm Torque / in-lbs

Wrench Part

Number

52 508 45 8710-1935

90

56

90

8

5

8

8720-1765

8710-1582

8720-1765

Turn ON AC Power

Turn ON the AC power for all of the components in the following order:

1. RF and LO sources, RF power amplifier

2. HP 85309A LO/IF unit

3. Receiver


2

CAUTION

NOTE

Operation

Operation

Leveling Feedback Loop

Never interrupt the LO leveling feedback from the reference module leveling coupler, detector, or leveling cables. Doing so can cause the LO power to exceed the damage level of the HP 11970 mixers.

Electrostatic Discharge

When installing the mixers, connect the SMA cables to the test/reference modules before connecting them to the mixers. This will minimize the danger of an electrostatic discharge damaging the mixers.

The HP 85325 millimeter wave system is designed to be used with a

HP 85310A or HP 85301B. Refer to these instrument manuals for system level operating information.


Operation

Mixer Operating Parameters

Mixer Operating Parameters

Maximum RF Input

Power

Operate the HP 11970A mixers within the following operating parameters:

CW: No greater than +20 dBm

Pulse: No greater than +24 dBm at < 1 µ s

Average: No greater than +20 dBm

Maximum LO Input

Power

Required LO Power

Connector Care

No greater than +20 dBm

The HP 11970 mixers require +14 to +18 dBm at the LO input.

Proper Waveguide

Connector Alignment

Leave the plastic waveguide flange cap on whenever the system waveguide connectors are not connected together. This protects the mating surface from scratches, which can degrade performance.

If you are using Q, U, V, or W bands, waveguide flanges must be aligned properly or measurement errors may result. Refer to Appendix B.


3

General Information

General Information

Chapter Contents

•

Product Description

•

Specifications

•

MM-Wave Source and Mixer Characteristics

•

Supplied Equipment

•

Maximum Cable Lengths

Product Description

The HP 85325A millimeter subsystem is designed for use with the

HP 85309A distributed frequency converter. The subsystem (in conjunction with the transmit RF source, source amplifier, and HP 85309A) downconverts mm-wave frequencies to a 20 MHz IF signal. This IF signal is required by the HP 8510 or HP 8530 receiver.

The frequency range of your millimeter-wave system depends on whether you are using an R, Q, U, V, or W band source module.


General Information

Specifications

Specifications

About Specifications

•

All millimeter bands are specified with HP 11970 harmonic mixers.

•

Sensitivity is defined as signal equals noise. Averaging will improve sensitivity by 10 log x (averaging factor).

•

Channel isolation is the coherent RF leakage from the reference mixer to the test mixer with inputs terminated.

•

To insure best system performance, take care in connecting all waveguide flanges by securing all four screw points. Appendix B explains how to connect waveguide connectors properly.

•

For specified performance of the mm-wave source, refer to documentation for the RF source module used.

Table 3-1 R, Q, and U Band System Level Specifications

Frequency Range (GHz) mm Wave Source Module

Max. Output Power (dBm)

1

Sensitivity (dBm)

(S/N = 1, with 0 averages

Sensitivity (dBm)

(S/N = 1, with 128 averages)

Dynamic Range (dB)

(0 averages)

Compression Lvl (dBm)

1

(at 0.1 dB)

Channel Isolation (dB)

(reference to test)

Typical Match

1

(dB)

1. the input of test and reference isolators.

HP R85325A

R Band

26.5 to 40 GHz

HP 83554A

+7

-88

-109

-79

-19

-100

15.5

HP Q85325A

Q Band

33 to 40 GHz 40 to 50 GHz

HP 83555A

+3

-85

+3

-85

-106

-71

-24

-100

15.5

-106

-77

-21

-100

15.5

HP U85325A

U Band

40 to 48 GHz 48 to 60 GHz

HP 83556A

+3

-86

+3

-86

-107

-72

-24

-100

15.5

-107

-78

-21

-100

15.5


General Information

Specifications

Table 3-2 V and W Band System Level Specifications

Frequency Range (GHz) mm Wave Source Module

Sensitivity (dBm)

(S/N = 1, with 0 averages

Sensitivity (dBm)

(S/N = 1, with 128 averages)

Dynamic Range (dB)

(0 averages)

Compression Lvl (dBm)

(at 0.1 dB)

Channel Isolation (dB)

(reference to test)

Typical Match

1

(dB)

1. At the input of test and reference isolators.

HP V85325A

50 - 75 GHz - V Band

HP 83557A

-78

(-82 typical)

-99

(-103 typical)

60

(68 typical)

-18

-100

9.5

HP W85325A

75 - 110 GHz - W Band

HP 83558A

-71

(-74 typical)

-92

(-95 typical)

56

(62 typical)

-15

-100

9.5


General Information

MM-Wave Source and Mixer Characteristics

MM-Wave Source and Mixer Characteristics

The following tables identify the INPUT and OUTPUT characteristics of the

HP 8355xA series millimeter-wave sources and HP 11970x mixers.

Table 3-3 MM-Wave Source Information

MM Source Model # Output Frequency MM-Wave Output

1

Harmonic Number RF Input Level

HP 83554A

HP 83555A

26.5 - 40 GHz

33 - 50 GHz

7 dBm

3 dBm

2

3

+17 dBm

+17 dBm

H P83556A

HP 83557A

40 - 60 GHz

50 - 75 GHz

75 - 110 GHz

3 dBm

3 dBm

0 dBm

3

4

6

+17 dBm

+17 dBm

+17 dBm HP 83558A

1. At 25

°

C

± 5°

C

Table 3-4 MM-Wave Mixer Information

Mixer Model #

HP 11970A

HP 11970Q

HP 11970U

HP 11970V

HP 11970W

RF Frequency

Range

26.5 - 40 GHz

33 - 50 GHz

40 - 60 GHz

50 - 75 GHz

75 - 110 GHz

Harmonic Number LO Power Level

8

10

10

14

18

+16

+16

±

2 dBm

+16

±

2 dBm

+16

±

2 dBm

+16

±

2 dBm

±

2 dBm


General Information

Supplied Equipment

Supplied Equipment

The following items are supplied with the HP x85325A and the HP 85326A.

Table 3-5 Supplied Parts

Description Standard

Quantity

Option 001

Quantity

Option 002

Quantity

With the HP x85325A:

MM-Wave Source

Module

Directional Coupler

Mixers

Isolators

1/4 inch Wrench

3/16 inch Wrench

3/32 Hex Ball Drive

4-40, 0.4 inch Screws

4-40, 0.5 inch Screws

1

2

1

1

2

1

1

50

50

1

1

3

3

1

1

1

50

50

1

4-40 Hex Nuts

4-40 Captive Screws

With the HP 85326A:

T-10 TORX Driver

5/16 inch Wrench

4 dB Attenuator

1

1 dB Attenuator

2

1 dB Attenuator

2

50

50

1

1

1

50

50

1

1

2

2

2

3

3

With both:

Operating and Service

Manual

1 1 1

1. This attenuator is shipped inside the test module.

2. These attenuators are shipped inside the test and reference modules.

4

4

50

50

1

1

3

50

50

1

1

4

1

1

4

Model or Part

Number

HP 8355xA

85325-90061

HP 752D

HP 11970 C01

HP 365A

8710-0510

8710-0013

8710-1539

3030-0221

3030-0209

2260-0002

1390-0765

8710-1623

8720-0015

0955-0208

0955-0301

0955-0321


General Information

Maximum RF Cable Lengths


In millimeter-wave systems, there is a length limit on the HP 85381A LO cable that goes from the LO source to the LO INPUT of the HP 85309A (L

S

) and the L

R cable (the cable that goes between the REF LO OUT of the

HP 85309A and the LO IN on the reference module).

L

S

= source module cable

L

R

= reference module cable

L

T

= test module cable

Refer to Figure 3-1 and Table 3-6 to determine the maximum L

S

length.

Figure 3-1 L

S

, L

R

, and L

T

Cables

Table 3-6 Maximum Cable Lengths (meters)

Cable Type

HP 85381A

MaCom FA29RX

LO Frequency (max)

GHz

6

6

LO Source to

HP 85309A (L

S

)

17

18

HP 85309A to

HP 85325A/B (L

R

, L

T

)

6

11


Formulas for Cable

Length Maximums

General Information


The maximum LO source frequency required when driving the HP 11970x waveguide mixers is 6.11 GHz. The two cable lengths (L

R

and L

T

) are affected by this maximum frequency. Refer to the diagram below.

NOTE

Figure 3-2 L

S

, L

R

, L

T

Cable Lengths, Example

The maximum length of the LO cables (L

R

or L

T

) is a function of: a.

the LO power required by the mixers b.

the LO output power available from the HP 85309A across the LO frequency range (3 to 6 GHz) c.

the loss through other microwave components in the LO path.

Test and reference cables must be the same length.

The output LO power of the HP 85309A is normally greater than +20.8 dBm between 3 and 6 GHz. The mixers require a nominal +16 dBm (+14 dBm minimum). The difference between these two LO power levels (+ 20.8 dBm and +16 dBm) determines the maximum loss of the test and reference path.


CAUTION

General Information


The loss through the HP 85326A and the associated 1 meter cable is about

1.6 dB. The loss associated with either the L

R dB.

or L

T cables cannot exceed 3.2

If using an HP 85381A type cable, the length should not exceed 5 meters.

The damage level for the HP 11970x mixer is +20 dBm. This can occur if the ALC loop is broken and the proper setup procedure was not used for the

HP 85325A internal attenuator values.


4

System Performance Verification

System Performance Verification

Introduction

This performance verification should be performed at least once a year.

This procedure verifies that the millimeter subsystem meets or exceeds its published specifications. Specifications are listed in Chapter 3. If traceability to a local standards organization is required, then it can be done with this procedure. One such standards organization is the United States National

Institute of Standards and Technology.

The performance verification is composed of two parts:

• transmitter verification

• receiver verification

The transmitter verification should be performed first. This allows the receiver verification to be run with a transmitter that is known to be within specifications.

Recommended Test Equipment

The following tables list major instruments required for performing the millimeter wave measurement system verification. Substitute test instruments can be used if they meet or exceed the critical specification

shown in the Table 4-1 on page 4-2 and Table 4-2 on page 4-3. “No

substitute” means you must use the listed device. Miscellaneous adapters and cables are also required, and may not be listed in the tables.

To determine the recommended equipment for testing each of the millimeter wave system instruments, refer to the manual for that instrument.



Non-Banded

Equipment

Table 4-1 shows equipment that is not millimeter wave band dependent. The

equipment can be used with any millimeter system.

Table 4-1 Recommended Test Equipment (non-banded)

Item Critical Specification Recommended Model (or Part Number)

The following equipment is part of the antenna measurement system

Receiver No substitute See Compatible Instruments

1

LO Source No substitute See Compatible Instruments

1

LO/IF Unit No substitute

RF Source

Amplifier

2

No substitute

Frequency band of test

HP 85309A

See Compatible Instruments

1

No recommended model

Additional Equipment Needed

Controller

Floppy Disk Drive

4

Hard Disk Drive

4

No substitute

Double sided high density

HFS formatted

HP 9000 series 300

HP 9122C

3

Printer HP-IB Interface

No substitute

HP 2225A or 2227B

HP 85325-10001

5

Verification Software

Frequency Counter

6 7 8

No substitute HP 5343A opt. 001 or opt 002

HP 5351B opt. 001 or opt.002,

HP 5350B opt. 001 or opt. 002 with HP-IB

HP 436A,437B,438A Power Meter

6

Power Sensor

6

Oscilloscope

9

No substitute

No substitute

50MHz bandwidth

HP 8485A or 8481A

Connector Adapters

3/32 Hex Ball Driver

Type-N and 3.5 mm

No substitute

Various

10


8710-1582 (supplied with HP 85301B)

11

5 in-lb Torque Wrench No substitute

1. Located in the HP 85310A manual.

2. Not all antenna test systems will use an amplifier.

3. Requires HP BASIC revision 6.0 or higher with 3 Mbytes of RAM memory.

4. A hard disk with one 3.5inch floppy disk may be used.

5. Consists of three disks

6. For traceability verification the Power Meter/Sensor and Frequency Counter should be traceable. No other traceable instruments are required.

7. Requires a 20 dB attenuator on the RF input.

8. Optional if using synthesized sources.

9. Needed for Chapter 5 only. This adjustment is only required if the LO and RF synthesizer's timebases are not connected together.

10. Type-N(m) to 3.5 (f), type-N (f) to 3.5 (f), 3.5 (f) to 3.5 (f).

11. Use this wrench for all SMA/3.5 mm connections in this procedure.



Band-Dependent

Equipment

Table 4-2 shows equipment that is millimeter wave band dependent. Fixed

terminations, variable attenuators, and directional couplers are only usable in one band. Therefore, if your system has more than one millimeter wave band, you must have a termination, variable attenuator, and directional coupler for each band.

Table 4-2 Recommended Test Equipment (banded)

Item

Power Meter

Power Sensor

Critical Specification

No substitute

No substitute

Recommended Model or Part Number

Anritsu ML83A (for V or U bands only)

R band: HP R8486A

Q band: HP Q8486A

U band: Anritsu ML715A

V band: Anritsu ML716A

W band: HP W8486A

Fixed Termination

1

Variable Vane Attenuator

Return loss >30 dB

0 to 40 dB attenuation

R band: HR R910A

Q band: HP Q910A

U band: HP U910A

V band: HP V910C

W band: HP W910C

R band: HP R382A

Q band: HP Q382A

U band: HPU382A

V band: Millitech DRA-15 (v-band)

W band: Millitech DRA-10 (w-band)

Directional Coupler Coupling factor 10 dB R band: HP R752C

Q band: HP Q752C

U band: HP U752C

V band: HP V752C

W band: HP W752C

1. You must have a fixed termination for each test channel of your system



Transmitter Performance Verification

Transmitter Performance Verification

The transmitter performance verification checks the transmitter section of the antenna measurement system. The following tests are performed:

System Configuration

Sets up the millimeter wave system for verification. It is also used to input the system hardware's model and serial numbers.

CW Frequency Accuracy

Checks the frequency accuracy of the transmitter source. The Self Test performs the HP 8360 series full self test.

Maximum Leveled Power

Ensures that the RF source and the optional amplifier produce the specified leveled power.

RF Source Calibration

Calibrates the transmitter for use as the test source for the receiver portion of the verification.

See “Detailed Test Description” on page 4-15 for additional information.



Receiver Performance Verification


The receiver performance verification checks the receiver section of the antenna measurement system. The tests are divided into two sections.

First Section

The first section tests the various parameters of the receiver system. The results of these tests are used to calculate the specified parameters in the section below. It is possible to have one of these tests fail but still be within the specified parameters of the millimeter subsystem. These tests consist of:

RF to IF Conversion

Measures the power loss of the mixers when the RF signal is converted to the IF signal. This is not a specified system performance parameter.

IF Noise

Measures sensitivity (the RMS noise level of the trace data when the test or reference channels are terminated with a 50 ohm load). This is not a specified system performance parameter.

Crosstalk

Measures signal leakage between the antenna reference and the test channels. This is a specified system performance parameter.

Compression

Measures input power at which the mixers exhibit 0.1 dB compression. This is a specified system performance parameter.

Second Section

The second section takes the results of the above section and calculates the specified parameters of the millimeter subsystem. These tests consist of:

Tracking Results

Calculates the conversion gain tracking between channels using RF to IF conversion measurements from the first section.This is not a specified system performance parameter.

Sensitivity Results

Calculates the actual sensitivity of the receiver in RMS power using IF

Noise and RF to IF Conversion measurements from the first section.This is a specified system performance parameter.

Crosstalk Results

Calculates the actual crosstalk between all channels using Crosstalk and RF to IF Conversion measurements from the first section. This is a specified system performance parameter.




Dynamic Range Results

Calculates the dynamic range of the system using Compression, IF Noise, and RF to IF Conversion measurements from the first section. This is a specified system performance parameter.

See “Detailed Test Description” on page 4-15 for additional information.


CAUTION

CAUTION


Setting Up The Equipment


Procedure

1. Be sure that the correct HP BASIC operating system, drivers, and language extensions are loaded into the computer controller.

2. The receiver, LO/IF unit, mixers, LO source, and cables should be in the same configuration in which they are normally used. Make sure that all cables are connected properly, and that the receiver is in the same multiple source mode as is used in your system. All connectors should

be properly torqued, refer to Table 4-3 for proper torque specifications.

Table 4-3 Proper Connector Torque

Connector

Type-N

3.5 mm

SMA

2.4

Torque cm-kg

52

9.2

5.7

9.2

56

90

Torque

N-cm

508

90

5

8

Torque in-lbs

45

8

Wrench

Part Number

8710-1935

8720-1765

8710-1582

8720-1765

Never exceed the recommended torque when attaching cables.

3. Connect test equipment to the system components as shown in

Figure 4-1 on page 4-8. The mixers must be placed near the verification

system during the performance verification.

Do not connect the LO cables to the mm-wave mixers until the LO power level has been checked.




NOTE

Figure 4-1 Initial Equipment Configuration

This procedure assumes you will be using some of the cables from your actual range, specifically, the cables between the LO/IF unit and the mixers.

This requires that the cables be pulled from their installation location so that the mixers can be placed near the verification system. If the cables cannot be pulled, they must be tested separately. In this case the mixers should be connected to the verification system with a backup set of HP 85381 cables of the same type and length as the cables normally used in the system.

4. Turn on all equipment and allow it to warm up for one hour.

If you cannot bring the mixer down from the antenna tower, consider taking the RF source and power meter up to the mixers. In this case, two additional

HP-IB extenders will be required: One to connect the power meter to the general HP-IB bus, and one to connect the RF source to the receiver system bus.




5. Make sure the HP 8360's languageswitches are set to the Analyzer Mode

shown in Table 4-4. The HP 8360A will not work with your antenna

measurement system while set to the TMSL mode.

Table 4-4 Switch Positions for Analyzer Mode

L3 L2 L1 A5

0 0 1 X

0 =switch down. 1 = switch up

X = leave as is

A4

X

A3

X

A2

X

A1

X

Turn the HP 8360A OFF, then ON to implement the switch change.


NOTE

Copy Onto a Hard

Disk

NOTE


Install the Performance Verification Software Onto a Hard Disk

Install the Performance Verification Software

Onto a Hard Disk

The Performance Verification Software (p/n 85325-60001) is not shipped with the HP 85325A or the HP 85326A; however, this software can be ordered through your local sales and service office. See the Service and

Support listing on page -viii in the front of the manual.

The current verification software requires specialized equipment that is not commonly available. YOur local HP service office can obtain the proper equipment. For this reason performance verification needs to be performed by a qualifies HP customer engineer.

[Brackets] indicate a front-panel key or computer keyboard.


This procedure will load the performance verification software onto a hard disk. This procedure will take approximately 2 hours to complete.

1. Insert the System Implementation disk into your floppy disk drive.

2. You must set the mass storage address to that floppy disk drive:

For example type:

MSI “:,700,1” and press Return

3. Type LOAD “HFS_COPY” and press Return

4. Press the {RUN} softkey or type Run' and press Return .

5. When prompted with, ENTER DESTINATION MASS STORAGE ADDRESS?, enter the appropriate address and press Return.

If applicable, press Return to select the default address of :,700,0 ,

6. When prompted with, OVERWRITE OLD FILES?, press Return .

Unless otherwise specified this program will overwrite duplicate files.

7. The program will ask you to insert each floppy disk of the Performance

Verification Software. When prompted, insert the appropriate disk, and press {Continue} .

8. When all disks have been copied the computer will display: HFS_COPY routine is completed . Press {Continue} to exit the program.



Starting The Program


NOTE [Brackets] indicate a front-panel key or on a computer key board.


Softkey Summary

{ABORT} stops the current test or menu and returns to the last menu or the test menu. (It will take effect at the end of a sweep.)

{MARK} selects the desired millimeter wave system to be tested. Make your selection based on the appropriate number of test channels for your system.

{NEW DUT} allows you to test a different antenna measurement system.

{SELECT} selects the test at the current cursor location.

{NEXT TEST} selects the test directly below the cursor.

{INPUT #} selects the test by entering the corresponding number then pressing

[Enter] .

NOTE

Load the calibration software onto a hard disk. Refer “Install the

Performance Verification Software Onto a Hard Disk” on page 10 then

continue with the following procedure.

Loading the Program

From a Hard Disk

1. Turn on the computer and load HP BASIC.

2. Type,

MSI “ANT_PERF_VER:,700,0” '(or an appropriate hard drive location) and press [Enter] .

3. Type,

LOAD “BOOTFILE” press [Enter] , type RUN and press [Enter] .

4. The program will now display the Mass Storage Selection Menu.

Choose one of the following function keys depending on your setup:

{Current} displays the mass storage location that is currently selected. The location is displayed in the bottom left hand corner of the display. For example: ANT_PERF_VER:CS80,700 .

If this is the correct location of the program file select {Begin} .

{Other} if current mass storage location is not correct, select {Other} , enter the correct location, then select {Begin}


Running the Tests

NOTE



5. When the TOP LEVEL MANAGER Menu appears, the selection cursor will be positioned at

01 Test

, select {Select} .

6. When the System Selection Menu appears, use the [up] [down] keys to place the cursor next to the system type and frequency band that you want to test, select {Select} .

7. When the computer displays: ENTER SYSTEM SERIAL NUMBER , enter the system serial number and press [Return] . (The system serial number is located on the back panel of the system rack.)

8. The next menu asks you to {Mark} the type of system option that you are using.

a.

Standard (1 Test Channel) b.

Opt. 001 (2 Test Channels) c.

Opt. 002 (3 Test Channels)

9. Use the [up] [down] keys to select the appropriate choice.

10. Press {Mark} to make the selection, then press {Done} .

1. When the SYSTEMS TEST menu appears, perform each test in numerical order. Use {Next Test} to select each test.

Tests 2 and 3 are optional if using a synthesized source.

2. Follow the instructions presented on the screen to complete the test.

Refer to Helpful Hints, on the following page, for additional information on certain portions of the test.

3. There is an option in the System Configuration Test window which allows you to print the data automatically after each test. Keep this data to document your test records.




Helpful Hints

Listed below are some helpful hints to assist you with using the Performance

Verification software.

System Configuration Test

Not all fields may be applicable to your test system. Leave the appropriate fields blank.

The power meter used to measure LO power does not need to be connected to the HP-IB Bus.

If during the tracking portion of this test, the LO power from the test mixer is out of its specified range, remove the test module cover and select a different combination of attenuators on the LO output. All attenuators should remain inside the test module housing.

CW Frequency

Accuracy Test

If you are using an HP 8360 series synthesizer as the LO source and the timebase of the LO source, RF source, and receiver are not connected

together, make sure you have performed the procedure in Chapter 5,

“Synthesized LO Source Timebase Check and Adjustment”.

Maximum Leveled

Power Test

The maximum leveled power test takes approximately 15 minutes to run.

This procedure considers the RF source and (optional) amplifier a single unit. Therefore, when the procedure refers to the “transmitter source” or

“source” it is referring to both units connected together. In this case, when the procedure says to “connect the power meter to the output of the source” you should actually connect the power meter to the output of the amplifier.

NOTE RF to IF Conversion, IF Noise Measurements, Channel Crosstalk, and

Compression tests use similar IF connections on the rear panel of the

HP 85309A. On some tests the connections do not change, on other tests they do change. Make sure that the cables are connected correctly for each test.

IF Noise

Measurement Tests

Each test takes approximately 10 minutes to run.

Channel Crosstalk Tests

It is essential that all millimeter wave connections are properly made. Refer to Appendix B. Physically separate the mixers by at least 1 meter (or as far as possible).

Compression Tests

Each test takes approximately 5 minutes to run.




Test Result Computations

The results of these last tests are computations from data taken in the previous tests. There are no more hookup changes required by the operator, you are only required to start each test, wait for data to be computed, print the data, and exit each test.

All the tests are now complete. If you have more than one frequency band for this system, rerun the program using the other bands.

NOTE When all tests and frequency bands are tested, you can archive the data on the hard disk by copying the test and data subdirectory onto a backup subdirectory.



Detailed Test Description


CW Frequency

Accuracy Test

NOTE

Maximum Leveled

Power Test

RF to IF Conversion

IF Noise

Measurements

Channel Crosstalk

This procedure measures minimum and maximum CW synthesizer frequencies using a frequency counter. Afterward, the self tests verify that the internal hardware is maintaining frequency accuracy over the full frequency range. For greatest frequency accuracy, the HP 8360 family of synthesizers should be plugged in to an AC power outlet for 30 days.

If the synthesizer is disconnected from AC power for more than 24 hours, the built-in timebase cools (and loses stability). If this occurs, it takes another 30 day period for the synthesizer to stabilize (after it is plugged in again).

This test uses a power meter to measure the maximum leveled power at

200 MHz intervals across the system's frequency band.

This procedure considers the RF source and (optional) amplifier a single unit. Therefore, when the procedure refers to the “transmitter source” or

“source” it is referring to both units connected together. In this case, when the procedure says to “connect the power meter to the output of the source” you should actually connect the power meter to the output of the amplifier.

This procedure uses a power meter to calibrate the RF output power from a

RF source. Next, the receiver measures this calibrated RF power across the frequency band. It then calculates the difference between the calibrated RF power and the power measured by the receiver. The difference between the two is the conversion gain (loss).

Low-level noise is the RMS noise level of the trace data when the channel is terminated with a low VSWR termination. Each channel (mixer) is tested across the frequency band to determine the RMS noise level.

This test measures the signal leakage from one channel to another channel.

In this test a high power signal is input to one channel (mixer), and the other channel is terminated with a low VSWR termination. Either the “a1” or “a2” channel is used to phase lock the system.


Compression



This test measures the input power at which the mixer exhibits 0.1 dB compression.Each channel is tested over the test frequency range. Data is taken at 51 frequency points.

First, a power level is input to the test mixer that is within its normal operating range. The input to reference mixer is set to a much lower level.

The test mixer output is ratioed to the reference mixer output and the data is put into memory. The data is then normalized to give a 0 dB reference,

Next, the input level is increased until the normalized data changes by 0.1

dB. The test mixer power level is the 0.1 dB compression point.


Synthesized LO Source Timebase Check and Adjustment

5

Synthesized LO Source Timebase Check and Adjustment

This adjustment only needs to be performed when:

• the LO is an HP 8560 series source and,

• there is no 10 MHz reference connection between the LO and RF source.

Description and

Procedure

This procedure adjusts the frequency accuracy of the internal 10 MHz timebase of the LO source. This adjustment should be done on a regular basis if you cannot connect the timebases (LO, RF, and receiver) together.

This adjustment procedure should be done at least once a year. Millimeter wave systems should be done more often.

Table 5-1 shows the required adjustment interval to maintain a given

accuracy. If you know the aging rate, you can determine a more precise adjustment interval. See the HP 8360 series synthesizer service manual for more information.

Table 5-1 Suggested Adjustment Interval for LO Sources

Highest Frequency Tested

< 26.5 GHz

Between 26.5 and 50 GHz

Between 50 and 110 GHz

Interval

1 year

6 months

3 months

For the best accuracy, readjust the 10 MHz timebase oscillator after the LO source and RF source have been ON or in STANDBY for 24 hours. After the

LO source timebase is adjusted, the timebase frequency should stay within the aging rate if the following things happen:

•

The timebase oven does not cool down.

•

The instrument stays at the same altitude.

•

The instrument does not receive any mechanical shock.

•

The instrument keeps the same orientation with respect to the earth's magnetic field.

If the timebase oven cools (the instrument is disconnected from ac power), you may have to readjust the timebase frequency after a new warm-up cycle.

Typically, however, the timebase frequency returns to within ± 1 Hz of the original frequency.


NOTE


You can adjust the internal timebase after reconnecting ac power for 30 minutes, but for best accuracy, test again after the instruments have been ON or in STANDBY for 24 hours.

Frequency changes, due either to a change in orientation with respect to the earth's magnetic field or to a change in altitude, are usually eliminated when the instrument is returned to its original position. A frequency change due to mechanical shock usually appears as a fixed frequency error.

Procedure

1. Connect the equipment as shown in Table 5-1. Preset all instruments and

let them warm up for one hour.

NOTE

Figure 5-1 LO Source 10 MHz Timebase Adjustment Setup

If the oscilloscope does not have a 50 ohm input impedance, connect channel 1 and the Trig 3 input through a 50 ohm feed through. Ensure that an external frequency standard is not connected to either of the synthesizers.

(At instrument preset the synthesizers automatically choose the external standard as the reference if one is connected to the 10 MHz REF INPUT.)

2. On the oscilloscope, set:

Channel 1:

Display

Volts/Division

Coupling

Impedance

Channel 2:

Display

On

200 mV dc

50 ohm

Off



Timebase:

Time/Division

Trigger

Trigger:

Trigger Mode

Trigger Source

Input Coupling

Display:

Display Model

10 ns

External

Edge

Trig 3 ac

Real Time

3. On the oscilloscope, adjust the trigger level so that the sweep is synchronized to the synthesizer's internal standard. The waveform will appear to drift.

4. Using a non-metallic tool, adjust the LO source's A23 10 MHz standard

(see Figure 5-2) for minimum horizontal movement of the oscilloscope

waveform.

Figure 5-2 10 MHz Standard Adjustment Location




6

Service

Introduction

This chapter explains how to find and correct malfunctions in the millimeter-wave system. This chapter covers the following topics:

•

Theory of Operation

•

Recommended Test Equipment

•

Receiver Troubleshooting

•

Replaceable Parts

•

Adjustments

Service


Service

Theory of Operation


A millimeter wave antenna measurement system (which uses an HP 85309A frequency converter) consists of a transmitter and receiver section.

Figure 6-1 shows the block diagram of the antenna measurement system.

Figure 6-1 System Diagram


Service


Transmitter Section

The transmitter consists of a synthesized RF source, amplifier, mm-wave source module, and transmit antenna. The RF source and transmit antenna provide the stimulus signal for the antenna being tested. The RF source is controlled by the receiver using the system bus. The RF source is called

SOURCE 1 in the receiver's softkey menus. HP-IB extenders are required if the distance between the receiver and RF source exceeds IEEE 488.2 limits.

Refer to Allowable HP-IB Cable Lengths below.

The Purpose of Each Device in the Transmitter Section

Source and Amplifier

The RF source and amplifier provide the +17 dBm power level required by the mm source module.

MM Source Module

(MM Head)

This module multiplies the RF frequency by a factor of 2, 3, 4, 5 or 6, depending on the model used. The source module interface (SMI) allows the source module to become an integrated part of the RF source. With the interface cable connected, the RF source knows that multiplied frequencies are being produced. Because of this, the source responds properly when the receiver asks for frequencies above its normal range. The source module accepts RF input power levels from +17 to +27 dBm.

The power output of the source module can be changed with the

STIMULUS controls on the receiver. When the SMI cable is used, the HP source module produces leveled mm-wave power.

Allowable HP-IB Cable Lengths

You are allowed 2 meters of cable length for each instrument that is connected to the main HP-IB bus (or to the system bus). A typical system has a computer, printer (or plotter), receiver, and positioner-controller connected to the main HP-IB bus (four devices). The total HP-IB cable length allowed in this example system is 2 x 4 = 8 meters. Under no circumstances can the total cable length ever exceed 20 meters, no matter how many devices are in the system.

If your system exceeds the allowed HP-IB cable length, you must use HP-IB extenders.

System Bus Cable Lengths

There are usually two instruments connected to this bus (the RF and the LO sources). Calculate the system bus limitation separately, using the same formula.

2 (meters/device) x 2 (devices) = 4 meters allowable length

Because the RF source is often far away from the receiver, HP-IB extenders are commonly used. Always use the slow mode on extenders connected to the system bus.


Service


Extender Recommendations

If using high speed “TURBO” (fast CW) modes, use fiber optic extenders for distances greater than 250 meters. Using coax at distances over 250 meters greatly slows the whole HP-IB bus. This slows the data transfer to the system computer which results in slow measurements.

Always use Fast Mode on coax extenders connected to the main HP-IB bus.

Always use Slow Mode on coax extenders connected to the HP 8530A local bus.

Receiver Section

The receiver section consists of the antenna under test, reference antenna (or directional coupler), frequency converter, mm-wave mixer modules, mm-wave mixers, isolators and the receiver (HP 8530 or HP 8510).

Purpose of Each Device in the Receiver Section

Isolators

There is an isolator on the input of each mixer. The isolators perform two functions:

•

They improve the impedance match between the test or reference antenna and the mixers.

•

The isolators stop mixer harmonic signals from radiating back toward the antennas, reducing crosstalk.

Mixers

The HP 8510 or HP 8530 receivers cannot accept RF frequencies directly.

Mixers are required to downconvert the RF frequencies to a 20 MHz IF frequency. The test and reference mixers are identical, but are driven by different types of mixer “modules.”

Mixer Modules

Mixers must receive proper LO power (+16

±

2 dBm) or they will not work properly. The Reference Module has an internal detector that measures the amount of LO power it receives. The detector's output voltage is sent to the

HP 85309A LO/IF unit, which controls the LO power level. This system does not measure power to the test module. It is assumed that the electrical distance to the test module is the same as the electrical distance to the reference module. Thus, the power arriving at the test module will be equal to the power arriving at the reference module. The system cannot control test and reference LO power independently.

The test module has a diplexer, which allows the LO and IF signals to travel through the same cable. This allows you to use a single-ring rotary joint for the antenna under test.


Service


HP 85309A LO/IF Unit

The LO/IF unit performs the following functions:

•

It amplifies and distributes LO power to the mixer modules.

•

It keeps LO power at the desired power with it's automatic leveling control (ALC) circuitry.

•

It receives IF power from each mixer module, amplifies it, and sends the

•

IF signals to the receiver.

•

It reduces crosstalk between the test and reference channels.

LO Source

The LO source supplies the LO signal which allows the mixers to downconvert RF frequencies to a lower IF frequency. The LO signal is amplified by the HP 85309A LO/IF unit, which then splits the LO signal and routes it to both mixer modules. The LO source is controlled by the receiver using the system bus. The receiver's system bus designates the LO source as

SOURCE 2. (In “Turbo Mode” configurations, the LO and RF sources are connected to the main HP-IB bus.)

If you use a synthesized LO source, you must connect the timebase reference oscillators of the RF source, LO source, and receiver together. This ensures that the downconverted IF frequency is exactly 20 MHz. If distance prohibits the timebase connections, then adjustments to the LO timebase must be performed periodically. Refer to the HP 85310A Operating and

Service Manual for instructions.

NOTE The HP 85310 is a product that contains the HP 85309A, along with

microwave frequency mixers. The HP 85310A manual describes the

HP 85309A LO/IF unit in great detail.

Non-synthesized LO sources (HP 8350) require a phase lock reference signal (LO PHASELOCK OUT) from the receiver, and do not require the timebases to be connected. Refer to the HP 85310A Operating and Service

Manual or HP 85301B Operating and Service Manual for more information.

Receiver

The receiver's primary task is to take the 20 MHz IF signals from the LO/IF unit and convert them into digital data. The data is processed by the receiver and displayed.

The receiver also controls the frequencies produced by the RF and LO sources. This is done by means of the receiver's dedicated HP-IB bus, called the System Bus. This bus is separate from the HP-IB bus, and it's sole purpose is to allow the receiver to control slave instruments.

If the LO source is not synthesized (HP 8350), then the receiver LO

PHASELOCK OUT provides the phase lock signal. This signal is input to the HP 8350 FM IN jack.


Service



The following tables list major instruments required for supporting the mm-wave measurement system. To determine recommended test equipment for each of the mm-wave system instruments, refer to the manual for that instrument. Substitute test instruments can be used if they meet or exceed the

Critical Specification shown in Table 6-1 on page 7 and Table 6-2 on page 8.

“No substitute” means you must use the listed device.

Miscellaneous adapters and cables are also required, and may not be listed in the tables.


Service


Non-Banded

Equipment

Table 6-1 shows equipment that is not mm-wave band dependent. The

equipment can be used with any mm system.

Table 6-1 Recommended Test Equipment (Non-Banded)

Item

Receiver

LO Source

LO/IF Source

RF Source

RF Source

Amplifier

Controller

Floppy Disk Drive

Critical Specification

No substitute

No substitute

No substitute

No substitute

1 to 26.5 GHz

3

No substitute

No substitute

Double-sided high density

Recommended Model or Part

Number


2


2

HP 85309A

See Compatible Instrument

2

HP 83640B

HP 8349B

HP 9000 series 300

4

HP 9122D

Use

T

I, O

IP

IP

1

Power Meter No substitute HP 436A, 437B, (for R, Q, or W bands)

IP, T

Power Sensor No substitute HP 8485A or 8481A

Various

5

I, P, T

Connector Adapters

Digital Multimeter type-N and 3.5 mm range: 0 to 50 Volts D.C.

I, P, T

Various T

T

6

Power Supply

Oscilloscope

-60 mV D.C. output

50 MHz bandwidth

Various

Various P, T

HP 8510C or 8510C opt. 011 system T

6 mmW Network Analyzer System mm-wave band must match your system

Up to 20 GHz Spectrum Analyzer

Additional Mixer

8

Various mm band must match your system HP 11970A

1. I = installation; O = operation; P = performance verification; T = troubleshooting and repair

2. Located in the HP 85310A manual.

3. Must be controlled independently of receiver.

4. Requires HP BASIC revision 6.0 or higher.

5. Type-N to 3.5 (f); Type-N (f) to 3.5 (f); 3.5 (f) to 3.5 (f).

6. Recommended not required.

7. Recommended for on-site use.

8. Required by spectrum analyzer.

IT

IT

7

I, O, P, T

I, O, P, T

I, O, P, T

I, O, P


Band-Dependent

Equipment

Service


Table 6-2 shows equipment that is mm-wave band dependent. Fixed

terminations, variable attenuators, and directional couplers are only usable in one band. Therefore, if your system has more than one mm-wave band, you must have a termination, variable attenuator, and directional coupler for

each band.

Table 6-2 Recommended Test Equipment (Banded)

Item Critical Specification

No substitute

Return loss > 14 dB

Return loss > 30 dB

0 to 40 dB attenuation

Recommended Model or Part

Number

Anritsu ML83A (for V or U bands) Power Meter

Power Sensors

2

Fixed Termination

2

Variable Vane Attenuator

2

R band: HP R8486A

Q band: HP Q8486A

U band: Anritsu ML715A

V band: Anritsu ML716A

W band: HP W8486A

HP x910A

3

HP x382A

3

V band, Millitech DRA-15

W band, Millitech DRA-10

HP x752C

3

Directional Coupler

2

Coupling factor 10 dB

1. I=installation; O = operation; P = performance verification; T = troubleshooting and repair

2. You must have one of these devices for each mm-wave band

3. Where x stands for the band R, Q, U, V, or W.

Use

1

P, T

P, T

P

P, T


Special 5/16 Inch

Wrench

Service

Troubleshooting

Troubleshooting

To troubleshoot the mmW system, refer to the Service chapter of the

HP 85310A Distributed Frequency Converter Operating and Service

Manual.

A specially-modified 5/16 wrench is supplied with this product. The

“closed” end has been machined to be smaller, and has been slotted so it will fit over a cable.


Service

Replaceable Parts


Ordering Information

To order a part, contact the nearest Hewlett-Packard office (See “Service and

Support” on page viii.), or you can find a list of HP Service Centers on the

web at http://www.hp.com/go/tmdir

How to Order Parts

If you need to order a replacement part, contact you nearest Hewlett-Packard representative.

To order a part that is not listed in the replaceable parts lists, include the instrument model number, complete serial number, the description and function of the part, and the number of parts required. Address the order to the nearest Hewlett-Packard office.


MM-Wave Module

Parts

Service


Test Module

See Figure 6-2 for the component layout.

Table 6-3 Test Module (85326-60001)Parts

Reference

Designator

AT1

AT2

AT3

E1

J1

J2, J3

U1

W1

W2

Description

4 dB attenuator, coax



Adapter, SMA (m) / (m)

Connector, RF type-N

Connector, 3.5 mm bulkhead

Diplexer

Cable, SMA (m) / SMB (f)

RF cable, reformable

HP Part Number

0955-0208

0955-0301

0955-0321

1250-1159

08340-60221

5062-6618

5086-7542

85320-60003

85325-20004

Figure 6-2 HP 85326A (85326-60001)

When Replacing a Diplexer

The diplexer has a dot on its case. This dot is next to the diplexer's LO port.

When you install the new diplexer, make sure the end with the dot is connected to the cable that goes to the LO OUT bulkhead connector.


Service


Reference Module

See Figure 6-3 for the component layout.

Table 6-4 Reference Module (85326-60002)Parts

W2

W3

W4

Reference

Designator

AT1

AT2

D1

J1, J2, J3

J4, J5

W1

Description



Directional coupler/detector

Connector, RF type-N

Connector, 3.5 mm bulkhead

Cable, IF through

Cable, detector voltage

Cable, reformable

Cable, LO out

HP Part Number

0955-0301

0955-0321

0955-0568

08340-60221

5062-6618

85325-20006

85325-60004

85325-20004

85325-20005

Figure 6-3 HP 85356A (85326-60002)


Service


Band-Related Parts

You receive a different directional coupler, mm-wave source module, detector, and isolator depending on the band of the system.

Table 6-5 Parts Supplied in Specific Bands

Description

Directional coupler

MM source module

1

Mixer

1

Parts Supplied for R Bands

0955-0616

HP 83554A

HP 11970A

2

Isolator

Waveguide straight

1. This item can be repaired.

2. Must be equipped with option C01.

85325-60005

(HP R365A)

00899-60001

Parts Supplied for Q bands

0955-0617

HP 83555A

HP 11970Q

2

85325-60006

(HP Q365A)

0955-0365

Parts Supplied for U bands

0955-0618

HP 83556A

HP 11970U

2

85325-60007

(HP U365A)

Parts Supplied for V Bands

0955-0619

HP 83557A

HP 11970V

2

85325-60008

(HP V365A)

Parts Supplied for W Bands

HP W752D

HP 83558A

HP 11970W

2

85325-60009

(HP W365A)

Repairing a Mixer or Source Module

The mm source module and mixers can be repaired rather than replaced.

Contact your nearest HP service center for instructions on returning a unit for repair. These items are not field-serviceable.


Service


The following parts are supplied with each system.

Miscellaneous Parts

Table 6-6 Miscellaneous Parts

Description

Screws, captive

Screws, 1/2 inch

Screws, 3/8 inch

Nut, hex 4-40

Nut, hex 4-40

RF cable, SMA (m) / (m), 1 m

HP Part Number

1390-0765

3030-0209

3030-0221

2260-0002

2260-0009

1

5061-5458

Wrench, 1/4 inch

Wrench, 3/16 inch

Torx driver T10

Modified wrench, 5/16

2

8710-0510

8720-0013

8710-1623

08555-20097

Attenuator, fixed, 10 dB, 3.5 mm

Operating and Service Manual

HP 8493C, opt. 010

85325-90001

1. Only supplied with R band.

2. This wrench is specially designed. The “closed” end has been machined to be smaller, and has been slotted so it will fit over a cable.

The modified end has another feature as well, it slips when approximately 10 inch-pounds of force is exerted on the SMA connection. 10 inch-pounds is the torque specification for all SMA connections inside the mm-wave modules, or inside the HP 85309A.

Adjustments

Only the HP 85309A LO/IF unit requires periodic circuitry adjustments.

Refer to the HP 85310A or HP 85301B Operating and Service Manual for

HP 85309A adjustment procedures. If the LO and RF source's timebases are not connected together, refer to either of the manuals (mentioned above) for adjustment instructions.

The LO power to the test and reference modules must be adjusted during installation. Refer to Installation, Chapter 1 for more instructions.


A


Using the HP 8340/41 in Your System

Connect an HP 8340/41 RF source as shown in Figure A-1.

Figure A-1 HP 8340/41 RF Source

HP 85325A Operating and Service Manual A-1


A-2 HP 85325A Operating and Service Manual


B

Connecting the Waveguide Properly

Handling and Storing

Handle and store the devices with care; their continued performance and accuracy depend on maintaining precise mechanical tolerances. When the devices are not in use, replace their protective end caps.

Connecting WR-62

Waveguide

Unlike threaded devices, waveguide mating planes are flanges (often precision) that you must carefully screw together. Always connect waveguide in the same flange orientation. For example, use the label as a reference and always connect a device with the label facing the same direction.

Wear

While connector wear can eventually degrade performance, properly connected waveguide flanges experience very little wear, and should have a long life.

Visual Inspection

Each time you make a connection, inspect mating surfaces for dirt, dust, foreign particles, or scratches which can degrade device performance. A damaged mating surface can damage any good surface connected to it. If necessary, clean all mating surfaces using alcohol and a lint-free swab or cloth.

HP 85325A Operating and Service Manual B-1

Precision Flanges


A precision flange has four corner holes (for the screws) and two precision alignment holes, as shown in Figure B-1 below. A non-precision flange has only the four corner holes.

Figure B-1 Alignment Holes

If you wish to connect two precision flanges, refer to ““Aligning Two

Precision Flanges” on page 3.” If you wish to connect a precision flange to a

non-precision flange, refer to ““Aligning Precision and Non-Precision

Flanges” on page 5”

B-2 HP 85325A Operating and Service Manual


Aligning Two Precision

Flanges

1. If necessary, place slip pins in the top and bottom holes of one flange

(see Figure B-2 below).

Figure B-2 Inserting Slip Rings

2. Using the pins as guides, carefully align the flanges, and insert screws in two opposite corner holes (see Figure B-3 below).

Figure B-3 Align Flanges

3. Place a lock washer and nut on each screw, and finger tighten.

4. Insert the remaining two screws.

5. Place a lock washer and nut on each screw, and finger tighten.

6. If necessary, remove the alignment pins.

7. Go to ““Tighten Flange Connections” on page 4.”



Tighten Flange

Connections

8. In an X pattern (for equal compression), tighten all four screws (see figure below). Do not over-tighten.

9. Visually inspect the connection.

NOTE

NOTE

Figure B-4 Inspect Flange Connections

The best connection has symmetrical pressure applied as you gradually tighten the screws.

Inspect Flange

Connections

Visually inspect a flange connection as follows:

10. Place an electric light or white paper behind the connection.

11. Check the flange matings for any gap. A good connection has no gaps between the connected waveguide flanges, and the waveguide walls are flush (there is no step or offset).

12. Make sure that all four screws are equally torqued.

Remember the most common cause of measurement error is a poor connection.



Aligning Precision and

Non-Precision Flanges

1. Place an alignment pin (with head) in the corner hole of one flange.

Place a second alignment pin in the diagonal corner hole of the second flange (see figure below).

Figure B-5 Align Pin with Head

2. Using the pins as guides, carefully align the flanges, and insert screws in the two open corner holes.

3. Place a lock washer and nut on each screw and finger tighten.

4. Remove the alignment pins and insert the remaining two screws.

5. Place a lock washer and nut on each screw and finger tighten.

Tighten Flange

Connections

6. In an X pattern (for equal compression), tighten all four screws (see figure below). Do not over-tighten.

Figure B-6 Tighten Screws



NOTE

NOTE

The best connection has symmetrical pressure applied as you gradually tighten the screws.

Inspect Flange

Connections

Visually inspect a flange connection as follows:

7. Place an electric light or white paper behind the connection.

8. Check the flange matings for any gap. A good connection has no gaps between the connected waveguide flanges, and the waveguide walls are flush (there is no step or offset).

9. Make sure that all four screws are equally torqued.

Remember the most common cause of measurement error is a poor connection.


Index

A

address

HP-IB, 1-5

LO source, 1-5

adjusting LO power for HP 85325A mixers, 1-11

adjusting LO power to test mixer, 1-15

adjustment

HP 85309A LO/IF unit, 6-14

LO power to reference mixer, 1-12

LO power to test mixer, 1-13

mixer LO power, 1-8

adjustment procedures, 1-11

attenuation

changing, 1-9

attenuator placement diagram

reference module, 1-10 test module, 1-10

diplexer

replacing, 6-11

E

electrostatic discharge, 2-1

equipment, 1-1

band-dependent, 4-3

initial onfiguration, 4-8

non-banded, 4-2

proper connector torque, 4-7

recommended test, 4-1

required, 1-2

set up, 1-1, 4-7

supplied, 3-5

test, 6-6

B

band-dependant equipment, 4-3

block diagram

coupled reference, 1-21

radiated reference, 1-23

G

general information, 3-1

C

cable lengths

system bus, 6-3

cable torque specifications, 1-24

cables

formulas for maximum lengths, 3-7

length of LO cable from HP 85309A to reference module, 1-9

Ls, Lr, Lt, 3-6

calculating system bus cable lengths, 6-3

changing attenuation, 1-9

checking

reference LO power, 1-14

coax torque specifications, 1-24

connector

proper torque, 4-7

proper torque specifications, 1-24

connector care, 2-2

H

HP 11970 mixers power requirement, 2-2

HP 8510B

power leveling settings for, 1-6

HP 8510C

power level settings for, 1-6

HP 85309A LO/IF unit, 6-5

HP 8530A

power level settings for, 1-6

HP-IB address of LO source, 1-5

I

initial setup, 1-3

installation, 1-1

block diagram, 1-21, 1-23

final, 1-20

perform final, 1-1

reference attenuator, 1-10 test attenuator, 1-10

D

denom values

see Table 1-2, 1-6

description of product, 3-1

L

leveling control cables, 1-20

leveling feedback loop, 2-1

LO input power, maximum, 2-2

HP 85325A Operating and Service Manual Index-i

LO leveling feedback, 2-1

LO power, 1-1

adjusting for HP 85325A in conjunction with other mixers, 1-14

LO power level

adjust, 1-1

LO power level adjustment for mixers, 1-8, 1-11

LO power required, 2-2

LO source, 6-5 receiver, 6-5

suggested adjustment interval, 5-1

LO source HP-IB address, 1-5

LO source timebase description and procedure, 5-1

load the program from a hard disk, 4-11

power

adjusting LO power to test module, 1-15

checking reference LO, 1-14

LO

adjusting if using HP 85325A in conjunction with other mixers, 1-14

adjusting if using HP 85325A mixers, 1-11

power, LO, 2-2

product description, 3-1

program

starting, 4-11

proper waveguide connector alignment, 2-2

M

mixer information

mm-wave, 3-4

mixer LO power level adjustment, 1-8

mixer modules, 6-4

mixer operating parameters, 2-2

mixer operation, 1-1

mixer operation check, 1-16

MM source module, 6-3

MM-wave

mixer characteristics, 3-4 source characteristics, 3-4

MM-wave mixer information, 3-4

multiple source mode settings, 1-6

multiplier denominator

table of values for HP 11970A, Q, U, V, W, 1-7

O

offset frequency setting, 1-7

operation, 2-1

theory of, 6-2

operational check

mixers, 1-16

optional 10 MHz reference connection, 1-4

P

perform final installation, 1-1

performance

transmitter, 4-4

performance verification, 4-1

compression, 4-5 crosstalk, 4-5

dynamic range results, 4-6

IF noise, 4-5

RF to IF conversion, 4-5 sensitivity results, 4-5 tracking results, 4-5

transmitter, 4-4

phaselock settings, 1-5

R

receiver section

isolators, 6-4 mixers, 6-4

receiver settings, 1-5

recommended test equipment, 6-6

reference mixer connections, 1-12

reference module, 6-4

reference module pad placement diagram, 1-10

required LO power, 2-2

RF cable lengths, maximum, 3-6

RF input power, maximum, 2-2

running the tests, 4-12

S

saving the setup, 1-19

selecting reference and test attenuation for the HP 85326A, 1-9

service, 6-1

setting up the receiver, 1-5

settings

multiple source mode, 1-6

offset frequency, 1-7

phaselock, 1-5

power leveling, 1-6

HP 8510B, 1-6

HP 8510C, 1-6 power leveling settings, source cable not connected, 1-6

receiver, 1-5

setup

saving, 1-19

timebase adjustment, 5-2

softkey summary, 4-11

source

LO, 6-5

source information

mm-wave, 3-4

specifications, 3-2

R, Q, U bands, 3-2

V, W bands, 3-3

start and stop frequencies for HP 11970A, Q, U, V, W, 1-7

starting the program, 4-11

synthesized LO source timebase check and adjustment, 5-1

system phase lock settings, 1-5

Index-ii HP 85325A Operating and Service Manual

T

test equipment, 6-6

recommended, 4-1 test equipment, recommended, 4-1

test mixer

adjusting LO power, 1-15

test module, 6-4

theory of operation, 6-2

timebase check, 5-1

torque

connector, 4-7

torque specifications for cables, 1-24

transmitter section, 6-3 purpose of each device, 6-3

U

using an HP 8350 LO power source, 1-18

using the HP 8340/41 RF source, 1-23

V

verification

CW frequency accuracy, 4-4 maximum leveled power, 4-4

RF source calibration, 4-4 system configuration, 4-4

W

waveguide

accesory hardware kit, 1-23

accessory hardware kit, 1-3

connecting, 1-23

connector alignment, 2-2 waveguide alignment, see Appendix B

HP 85325A Operating and Service Manual Index-iii

Index-iv HP 85325A Operating and Service Manual

No results