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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.
Subject to Export Control, see Cover Page for details.
OPERATION MANUAL
RADAR TEST SET
RD-301A
PUBLISHED BY
Aeroflex
COPYRIGHT © Aeroflex 2008
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
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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Aug 1/08
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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Aug 1/08
2. CONTROLS, CONNECTORS AND INDICATORS
F L
IO
LN
OY
+-
OF
F
F
-MHz
F
F OFFSET
-20
-30
-40
-50
-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
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
RF
RFPRF
MKR
DISPLAY MNL FREQMKR FREQ
MHz
IF SWEEP WIDTH
PULSE WIDTH S
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
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
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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Aug 1/08
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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Aug 1/08
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.
/
