Aeroflex RD-301A Operation Manuals

Radar Test Set

Operation Manual

1002-9001-200

Issue-5

RD-301A

EXPORT CONTROL WARNING: This document contains controlled technology

or technical data under the jurisdiction of the Export Administration

Regulations (EAR), 15 CFR 730-774. It cannot be transferred to any foreign

third party without the specific prior approval of the U.S. Department of

Commerce Bureau of Industry and Security (BIS). Violations of these

regulations are punishable by fine, imprisonment, or both.

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OPERATION MANUAL

RADAR TEST SET

RD-301A

PUBLISHED BY

Aeroflex

transmitted in any form or by any means, electronic, mechanical, photocopying, recording or

otherwise without the prior permission of the publisher.

Original Printing May 1992

Revision 1 Feb 1999

Issue-2 Jan 2004

Issue-3 Oct 2004

Issue-4 Feb 2007

Issue-5 Aug 2008

10200 West York / Wichita, Kansas 67215 U.S.A. / (316) 522-4981 / FAX (316) 524-2623

OPERATION MANUAL

RD-301A

Subject to Export Control, see Cover Page for details.

SAFETY FIRST: TO ALL OPERATIONS PERSONNEL

REFER ALL SERVICING OF UNIT TO QUALIFIED TECHNICAL PERSONNEL. THIS UNIT CONTAINS NO

OPERATOR SERVICEABLE PARTS.

WARNING: USING THIS EQUIPMENT IN A MANNER OTHER THAN SPECIFIED BY THE ACCOMPANYING

DOCUMENTATION MAY IMPAIR THE SAFETY PROTECTION PROVIDED BY THE EQUIPMENT.

CASE, COVER OR PANEL REMOVAL

Removing protective covers, casings or panels from this Test Set exposes the operator to electrical hazards

that can result in electrical shock or equipment damage. Do not operate this Test Set with the case, cover

or panels removed.

SAFETY IDENTIFICATION IN TECHNICAL MANUAL

This manual uses the following terms to draw attention to possible safety hazards, that may exist when

operating this equipment.

CAUTION: THIS TERM IDENTIFIES CONDITIONS OR ACTIVITIES THAT, IF IGNORED, CAN RESULT IN

EQUIPMENT OR PROPERTY DAMAGE (E.G., FIRE).

WARNING: THIS TERM IDENTIFIES CONDITIONS OR ACTIVITIES THAT, IF IGNORED, CAN RESULT IN

PERSONAL INJURY OR DEATH.

SAFETY SYMBOLS IN MANUALS AND ON UNITS

CAUTION: Refer to accompanying documents. (This symbol refers to specific CAUTIONS represented on

the unit and clarified in the text.)

AC OR DC TERMINAL: Terminal that may supply or be supplied with ac or dc voltage.

DC TERMINAL: Terminal that may supply or be supplied with dc voltage.

AC TERMINAL: Terminal that may supply or be supplied with ac or alternating voltage.

SWITCH OFF: AC line power to the device is OFF.

SWITCH ON: AC line power to the device is ON.

EQUIPMENT GROUNDING PRECAUTION

Improper grounding of equipment can result in electrical shock.

USE OF PROBES

Check the specifications for the maximum voltage, current and power ratings of any connector on the Test

Set before connecting it with a probe from a terminal device. Be sure the terminal device performs within

these specifications before using it for measurement, to prevent electrical shock or damage to the

equipment.

POWER CORDS

Avoid using power cords which are frayed, broken or expose bare wiring when operating this equipment.

USE RECOMMENDED FUSES ONLY

Use only fuses specifically recommended for the equipment at the specified current and voltage ratings.

CAUTION: SIGNAL GENERATORS CAN BE A SOURCE OF ELECTROMAGNETIC INTERFERENCE (EMI) TO

COMMUNICATION RECEIVERS. SOME TRANSMITTED SIGNALS CAN CAUSE DISRUPTION

AND INTERFERENCE TO COMMUNICATION SERVICES OUT TO A DISTANCE OF SEVERAL

MILES. USERS OF THIS EQUIPMENT SHOULD SCRUTINIZE ANY OPERATION THAT RESULTS

IN RADIATION OF A SIGNAL (DIRECTLY OR INDIRECTLY) AND SHOULD TAKE NECESSARY

PRECAUTIONS TO AVOID POTENTIAL COMMUNICATION INTERFERENCE PROBLEMS.

OPERATION MANUAL

RD-301A

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OPERATION MANUAL

RD-301A

TABLE OF CONTENTS

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TABLE OF CONTENTS

Title Chapter/Section

Title/Copyright Page

Safety Page

Table of Contents

Introduction

Chapter 1

Section 1 - Description 1-1

Section 2 - Operation 1-2

Section 3 - Specifications 1-3

Section 4 - Shipping 1-4

Section 5 - Storage 1-5

Appendix A - I/O Connectors Pin-Out Tables

Appendix B - Test Equipment Requirements

Appendix C - Metric/British Imperial Conversion Table with Nautical Distance Conversions

Appendix D - Abbreviations

Index

OPERATION MANUAL

RD-301A

TABLE OF CONTENTS

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OPERATION MANUAL

RD-301A

INTRODUCTION

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INTRODUCTION

This manual contains the information necessary to install, operate and evaluate the RD-301A Test

Set.

It is strongly recommended that personnel be thoroughly familiar with the contents of this manual

before attempting to operate this equipment.

In this manual, the RD-301A Radar Test Set is also referred to as Test Set, RD-301A or RD-301A

Test Set.

ORGANIZATION

This manual is divided into the following Chapters and Sections:

CHAPTER 1 - OPERATION

Section 1 - DESCRIPTION (description of the RD-301A)

Section 2 - OPERATION (installation; controls, connectors and indicators; performance

evaluation; and general operating procedures)

Section 3 - SPECIFICATIONS

Section 4 - SHIPPING

Section 5 - STORAGE

OPERATION MANUAL

RD-301A

INTRODUCTION

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OPERATION MANUAL

RD-301A

1-TABLE OF CONTENTS

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CHAPTER ONE

RD-301A RADAR TEST SET

OPERATION MANUAL

TABLE OF CONTENTS

Title Chapter/Section/Subject Page

SECTION 1 - DESCRIPTION 1-1

1. General Description and Capabilities 1-1-1 1

1.1 General 1-1-1 1

1.2 Functional Capabilities 1-1-1 1

SECTION 2 - OPERATION 1-2

1. Installation 1-2-1 1

1.1 Controls, Connectors and Indicators 1-2-1 1

1.2 Safety Precautions 1-2-1 1

1.2.1 Complying with Instructions 1-2-1 1

1.2.2 Grounding Equipment and Power Cord 1-2-1 1

1.2.3 Operating Safety 1-2-1 1

1.2.4 CAUTION and WARNING Labels 1-2-1 1

1.3 Power Requirements 1-2-1 2

1.4 Power-Up Procedure 1-2-1 2

1.5 Rack-Mount Installation 1-2-1 2

2. Controls, Connectors and Indicators 1-2-2 1

2.1 RD-301A Front Panel 1-2-2 3

2.2 RD-301A Rear Panel 1-2-2 9

3. Performance Evaluation 1-2-3 1

3.1 General 1-2-3 1

3.2 Pre-Operational Considerations 1-2-3 1

3.3 Controls, Connectors and Indicators 1-2-3 1

3.4 Test Equipment Requirements 1-2-3 1

3.5 Corrective Maintenance Procedures 1-2-3 1

3.6 Test Record 1-2-3 1

3.7 Performance Evaluation Procedures 1-2-3 2

3.7.1 RF 1-2-3 2

3.7.2 IF 1-2-3 2

3.7.3 PRF 1-2-3 3

3.7.4 Range 1-2-3 4

3.7.5 Meter and Tracking Functions 1-2-3 6

3.7.6 R1,R2 AUTO 1-2-3 8

3.7.7 Marker 1-2-3 9

3.8 Performance Evaluation Data Sheet 1-2-3 10

OPERATION MANUAL

RD-301A

1-TABLE OF CONTENTS

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Title Chapter/Section/Subject Page

4. General Operating Procedures 1-2-4 1

4.1 General 1-2-4 1

4.2 Pre-Operational Considerations 1-2-4 1

4.3 Controls, Connectors and Indicators 1-2-4 1

4.4 Test Equipment Requirements 1-2-4 1

4.5 Operating Precautions 1-2-4 1

4.6 Test Setup 1-2-4 2

4.7 Test Function Procedures 1-2-4 3

4.7.1 Peak Power and Frequency 1-2-4 3

4.7.2 Range Precision 1-2-4 4

4.7.3 Sensitivity 1-2-4 5

4.7.4 Turbulence 1-2-4 6

4.7.5 Dual Target Simulation 1-2-4 7

4.7.6 Effective Power and Automatic

Frequency Control (AFC) Centering 1-2-4 8

4.7.7 Minimum Detection Range (MDR) 1-2-4 9

4.7.8 Sensitivity Time Control (STC) 1-2-4 10

4.7.9 Magnetron Pulse Frequency and Phase Deviation1-2-4 11

4.7.10 IF Testing 1-2-4 15

4.7.11 UUT Power Percentage 1-2-4 16

SECTION 3 - SPECIFICATIONS 1-3

1. General 1-3-1 1

1.1 RF Signal Generator 1-3-1 1

1.2 IF Signal Generator 1-3-1 2

1.3 Modulation 1-3-1 2

1.4 Range 1-3-1 3

1.5 Frequency Counter 1-3-1 3

1.6 Power Meter 1-3-1 4

1.7 Outputs 1-3-1 4

1.8 Inputs 1-3-1 5

1.9 Power 1-3-1 5

SECTION 4 - SHIPPING 1-4

1. Shipping Test Sets 1-4-1 1

1.1 Information 1-4-1 1

1.2 Repacking Procedure 1-4-1 1

SECTION 5 - STORAGE 1-5

1. Storing Test Sets 1-5-1 1

OPERATION MANUAL

RD-301A

1-LIST OF ILLUSTRATIONS/TABLES

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LIST OF ILLUSTRATIONS

Title Chapter/Section/Subject Page

RD-301A Front and Rear Panels 1-2-2 1

Reply Pulse Width 1-2-3 5

Effective Power Evaluation Setup Diagram 1-2-3 6

Heterodyne Monitor L-Band Test Signal 1-2-3 7

R1,R2 AUTO Evaluation Setup Diagram 1-2-3 8

R1,R2 AUTO Threshold Measurement 1-2-3 9

RD-301A/UUT Interface 1-2-4 3

Discriminator Pulse 1-2-4 11

Heterodyne Monitor Output (Aligned Radar) 1-2-4 13

Heterodyne Monitor Output (Frequency Deviation) 1-2-4 13

Heterodyne Monitor Output (Mode Split) 1-2-4 13

Repacking Procedure 1-4-1 2

LIST OF TABLES

Title Chapter/Section/Subject Page

Recommended Fuse Ratings 1-2-1 2

FREQUENCY Hz/MHz Digital Display Control 1-2-2 3

Range Reply Rings Evaluation 1-2-3 4

OPERATION MANUAL

RD-301A

1-LIST OF ILLUSTRATIONS/TABLES

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OPERATION MANUAL

RD-301A

1-1-1

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SECTION 1 - DESCRIPTION

1. GENERAL DESCRIPTION AND CAPABILITIES

1.1 GENERAL

The RD-301A Radar Test Set is a precision

simulator designed for testing aircraft weather

radar and narrow pulse marine radar systems.

The solid-state, fully integrated Test Set

provides the means of completely testing

routine radar functions. The RD-301A also

satisfies simulation requirements for new

generation non-coherent radar systems. All

RF tests and measurements are accomplished

by connecting the RD-301A to the Unit Under

Test (UUT) with the use of the supplied

Serialized Coaxial Cable, Waveguide Coupler

and Waveguide Termination (Dummy Load).

An optional 10 dB Attenuator is included (when

ordered) for radars with output power levels

between 12 and 120 kW.

1.2 FUNCTIONAL CAPABILITIES

The RD-301A incorporates the following

features and capabilities:

● Automatically acquires, tracks and provides

a digital readout of the radar transmitter

frequency.

● Provides internal amplitude modulation or

accepts external amplitude modulation for

simulating target scintillation for turbulence

detection radars.

● Responds to radar transmitter pulse widths

of 50 ns to 30 μs over a frequency from

9295 to 9500 MHz.

● Measures radar transmitter peak pulse

power.

● Displays Effective (EFF) Peak Power,

quantitatively showing the effects of phase

modulation and frequency pulling in the

magnetron.

● Provides for accurate Automatic Frequency

Control (AFC) centering alignment on the

radar receiver (replacing the requirement

for an "echo box").

● Tests radar UUT sensitivity to determine

Minimum Discernable Signal (MDS).

● Provides an additional 0 to 20 dB

amplitude boost above selected output

level for checking radar contour threshold

circuits, receiver color and intensity

response.

● Provides IF sweep generator from 20 to

70 MHz and marker generator for IF and

AFC testing.

The RD-301A provides various forms of the

UUT transmitter signal for comprehensive

radar maintenance and testing. Signals are at

the following connectors:

● ANLYZER RF X-BAND XMTR Connector for

viewing the radar signal on a spectrum

analyzer.

● XMTR DET Connector for viewing radar

transmitter pulse shape on oscilloscope.

● XMTR DSCRM .1V/MHz Connector for

viewing radar pulse spectral characteristics

on an oscilloscope. Pulse frequency

changes are shown as amplitude shifts on

the oscilloscope.

● XMTR HET MON Connector for

oscilloscope display of frequency and

duration of modes, identifying location and

magnitude of phase pulling within the

magnetron pulse.

OPERATION MANUAL

RD-301A

1-1-1

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OPERATION MANUAL

RD-301A

1-2-1

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SECTION 2 - OPERATION

1. INSTALLATION

1.1 CONTROLS, CONNECTORS AND

INDICATORS

RD-301A controls, connectors and indicators

are specified with item numbers. The location

according to item number of each control,

connector and indicator is shown in 1-2-2,

Figure 1.

1.2 SAFETY PRECAUTIONS

Listed are several important safety precautions

which must be observed during installation and

operation. Aeroflex assumes no liability for

failure to comply with any safety precaution

outlined in this manual.

1.2.1 Complying with Instructions

Operating personnel should not attempt to

install or operate the RD-301A without reading

and complying with all instructions contained

in this manual. All procedures must be

performed in exact sequence and manner

described.

1.2.1 Grounding Equipment and Power

Cord

WARNING: ALL EQUIPMENT CHASSIS

CABINETS MUST BE

CONNECTED TO AN

ELECTRICAL GROUND TO

MINIMIZE SHOCK HAZARD.

WARNING: DUE TO POTENTIAL SAFETY

HAZARDS, USE OF THREE-

PRONG TO TWO-PRONG

ADAPTOR PLUG IS NOT

RECOMMENDED.

The ac power cable included with the Test Set

is equipped with a standard three-prong power

cable which must be connected to a properly

grounded three-prong receptacle. It is the

customer's responsibility to:

● Have a qualified electrician check wall

receptacle(s) for proper grounding.

● Replace any standard two-prong wall

receptacle(s) with properly grounded three-

prong receptacle(s).

1.2.3 Operating Safety

Due to presence of potentially lethal voltages

within the RD-301A, operating personnel must

not remove top or bottom covers at any time.

1.2.4 CAUTION and WARNING Labels

Extreme care should be exercised when

performing operations preceded by a CAUTION

or WARNING Label. CAUTION labels appear

where possibility of damage to equipment

exists. WARNING labels denote conditions

where bodily injury or death may result.

OPERATION MANUAL

RD-301A

1-2-1

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1.3 POWER REQUIREMENTS

The RD-301A Radar Test Set requires

continuous ac power to operate. The internal

power supply operates over a voltage range of

103 to 253 VAC. No internal wiring or

switching changes are required prior to

applying ac power to the RD-301A.

Instantaneous surge current on power-up is

<50 A. Input current varies to maintain

constant power over the input voltage range

(≤150 W).

For proper circuit protection, the RD-301A

requires a FUSE (51) with correct fuse rating.

Recommended fuse ratings according to input

voltage are listed in 1-2-1, Table 1.

INPUT

VOLTAGE

FUSE RATING AEROFLEX

PART NO

103 to 132

VAC

2.0 A, 250 V

Fast Blo

5106-0000-017

132 to 253

VAC

1.0 A, 250 V

Fast Blo

5106-4501-000

Recommended Fuse Ratings

Table 1

1.4 POWER-UP PROCEDURE

CAUTION: AVOID RESTRICTION OF AIR

FLOW THROUGH VENT HOLES

IN SIDE PANELS AND ACROSS

POWER SUPPLY HEAT SINK ON

REAR PANEL WHEN

INSTALLING RD-301A.

STEP PROCEDURE

1. Set RD-301A into operating position.

2. Connect ac power cable from AC INPUT

Connector (50) to power source.

3. Press LINE Switch (30) ON and verify

Frequency Hz/MHz Digital Display (1)

illuminates.

1.5 RACK-MOUNT INSTALLATION

The RD-301A is installed in bench-top or rack-

mount fashion. All Aeroflex test sets are

shipped from the factory with plastic feet

installed for bench-top installation.

Conversion from bench-top to rack-mount

installation requires a Rack-Mount Kit

(7001-7636-800). One kit per unit is required

for installation. Kits are ordered from the

factory.

OPERATION MANUAL

RD-301A

1-2-2

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2. CONTROLS, CONNECTORS AND INDICATORS

F L

IO

LN

OY

+-

OF

F

-MHz

F

F OFFSET

-20

-30

-40

-50

-60

-70

-80

+20

+10

0

-10

-20

-30

-40

-4

-5

-6

-7

-8

-9

-10

0

-1

-2

-3

50

500

200

150

100

1

0

4

3

2

1

1.5

2

2.5

3

3.5

4

4.5

5

.5

5

4.5

4

3.5

3

2.5

2

1.5

1

FREQUENCY Hz/MHz

OFFSET

EFF PEAKING

PK

POWER

.6

.4

.2

0

.2

.4

.6

SYSTEMS, INC.

12

11

10

9

8

7

6

5

4

CONTOUR

AUTO

R1, R2

R2 ALT

R2 ON

1

.1

10

100

KW PEAK

0

.1

.5

1

2

3

INTL PRF/AM

x1 x10NMS

RANGE SEL

R1

1

3

4

2

5

RANGE 2 DELAYRANGE 1 DELAY

100

10

.1

1

75318246

IF LO

IF HI

-10 dB

RF

RFPRF

MKR

DISPLAY MNL FREQMKR FREQ

MHz

IF SWEEP WIDTH

PULSE WIDTH S

DSCRM

.1V/MHzDETIF OUTIF SCP SWPEXT TRIGDLYD SYNCSYNC

TEST VIDEO TEST RF

1045-1250MHz

LINE

120 W MAX IN

COURSE dBm

OUTPUT LEVEL

FINE dBm

OUTPUT LEVEL

CONTOUR/R2/INTL AM

7

1

MODULATION

(+) (-)

EXTEXTCWINTLTRACK

OFF

INTL AM

RF IF

-10dB

HILOMNLMNL

-10dB

TRACKTRACK

EFF

READY

EFF

MON

HET

CAL

50 50

50 50 5050

AM UP MOD

X

B

A

N

D

O

/

I

XMTR

dB

BOOST

ATTEN

FINE

COARSE

ΩΩ

ΩΩΩΩ

μμ

μ

RINGS

RD - 301A

9007001

2

3

1

4

5

6

7

9

8

32

31

33

30

29

34

35

36

10141520 18 17 16 13 12 1119212223242526

28

27

37 38 4039 4341 42 44 45 46 47 48 49

9007002

E

S

U

F

U

S

E

F

U

S

E

SYSTEMS, INC.

X-BAND L-BAND

X-BAND

VIDEO

FM AM

50

%

EXT

OUTPUT

VCOAUX

X

M

T

R

ANLYZR RF

RD - 301A

1407

115

60

V

Hz

MODEL NO.

SERIAL

INPUT

IFR SYSTEM INC.

10200 W YORK

WICHITA, KANSAS 67215

50

51

545557 5256

53

RD-301A Front and Rear Panels

Figure 1

OPERATION MANUAL

RD-301A

1-2-2

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1. FREQUENCY Hz/MHz Digital Display

2. PRF/RF Switch

3. CONTOUR/R2/INTL AM dB BOOST/

ATTEN Control

4. OUTPUT LEVEL FINE dBm Control

5. IF HI Indicator

6. RF Indicator

7. RF -10 dB Indicator

8. IF LO Indicator

9. OUTPUT LEVEL COARSE dBm Control

10. MNL FREQ Controls

11. XMTR HET MON Connector (J49028)

12. XMTR DSCRM .1V/MHz Connector

(J49027)

13. XMTR DET Connector (J49026)

14. IF OUT Indicator

15. IF OUT Connector (J49025)

16. RF/IF MODE Pushbutton Switches

17. X-BAND SIGNAL Indicator

18. X-BAND I/O Connector (J49016)

19. MKR FREQ Control

20. IF SCP SWP Connector (J49012)

21. DISPLAY MKR Switch

22. EXT TRIG Connector (J49024)

23. INTL AM Switch

24. DLYD SYNC Connector (J49023)

25. INTL AM Indicator

26. SYNC Connector (J49022)

27. TEST RF 1045-1250 MHz Connector

(J49021)

28. TEST VIDEO Connector (J49020)

29. MODULATION MODE Pushbutton

Switches

30. LINE Switch

31. PULSE WIDTH μS Control (RANGE 2)

32. PULSE WIDTH μS Control (RANGE 1)

33. SWEEP WIDTH MHz Control

34. PULSE WIDTH MULTIPLIER Control

(RANGE 1)

35. PULSE WIDTH MULTIPLIER Control

(RANGE 2)

36. μS/NM Switch

37. RANGE 1 DELAY Thumbwheels

38. RANGE 2 DELAY Thumbwheels

39. RANGE SEL Switch

40. CONTOUR/AM UP MOD Indicator

41. INTL PRF/AM Control

42. X1/X10 INTL PRF/AM Switch

43. PANEL Meter

44. TRACK Indicator

45. PANEL METER ZERO Control

46. EFF READY Indicator

47. METER SELECT Switch

48. ΔF OFFSET/EFF PEAKING Control

49. OFFSET Indicator

50. AC INPUT Connector (49008)

51. FUSE

52. VCO L-BAND OUTPUT Connector

(J49004)

53. AM EXT INPUT Connector (J49005)

54. AUX X-BAND OUTPUT Connector

(J49002)

55. FM EXT INPUT Connector (J49006)

56. ANALYZER RF X-BAND XMTR

Connector (J49003)

57. ANALYZER RF X-BAND XMTR

Connector (J49003)

RD-301A Front and Rear Panels

Figure 1 (cont)

OPERATION MANUAL

RD-301A

1-2-2

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2.1 RD-301A FRONT PANEL

FREQUENCY

TYPE

MODE DISPLAY

PRF RF TRACK/RF TRACK -10 dB UUT Transmitter PRF

PRF INTL RD-301A Internal Oscillator PRF

(Internal AM frequency if On)

PRF EXT (+), EXT (-) External Trigger Signal PRF

RF IF LO/IF HI IF Signal Generator Frequency

RF IF LO/IF HI DISPLAY MKR

Switch (21) pressed

IF Marker Frequency

RF RF TRACK/RF TRACK -10 dB RF Signal Generator/UUT

Transmitter Frequency

RF RF MNL/RF MNL -10 dB RF Signal Generator Frequency

FREQUENCY Hz/MHz Digital Display Control

Table 2

1. FREQUENCY HZ/MHZ DIGITAL DISPLAY

Displays PRF (Hz), IF (MHz) or RF (MHz) as

selected with PRF/RF Switch and RF/IF MODE

Pushbutton Switches. Marker frequency (MHz)

is displayed when DISPLAY MKR Switch is

pressed. Refer to 1-2-2, Table 2.

2. PRF/RF SWITCH

Toggle switch selects type of frequency shown

on FREQUENCY Hz/MHz Digital Display.

Refer to 1-2-2, Table 2.

3. CONTOUR/R2/INTL AM DB

BOOST/ATTEN CONTROL

Boosts or attenuates output level set with

OUTPUT LEVEL COARSE dBm Control and

OUTPUT LEVEL FINE dBm Control. Inner knob

controls level in 1 dB steps (0-9). Outer knob

controls level in 10 dB steps (0-50). Selection

appears in small viewing window at top center

of control.

Boost is activated when RANGE SEL Switch is

in CONTOUR/AM MOD UP position and applies

to output levels from -127 to -75 dBm.

CONTOUR/R2/INTL AM dB BOOST/ATTEN

Control boosts contour or internal AM level

from 0 to 20 dB above selected output level.

NOTE: Selecting >20 dB boost produces

minimal or no additional level

increase>20 dB.

Attenuation is activated when RANGE SEL

Switch is in any R2 position (R2 ON; R2 ALT or

R1, R2 AUTO) or RINGS 1 through 5 with

internal AM activated. Range 2 reply or

internal AM is attenuated from 0 to -59 dB

referenced to Range 1 reply level set with

OUTPUT LEVEL COARSE dBm Control and

OUTPUT LEVEL FINE dBm Control.

4. OUTPUT LEVEL FINE DBM CONTROL

Decreases RF or IF output level in 1 dB steps

referenced to level set with OUTPUT LEVEL

COARSE dBm Control. Range is from 0 to

-10 dB.

5. IF HI INDICATOR

Green LED illuminates when IF HI is selected

with RF/IF MODE Pushbutton Switches. Green

indicates color of scale used on OUTPUT

LEVEL COARSE dBm Control.

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