Anritsu MG3641A User manual

Document No.: M-W1219AE-5.0
ANRITSU CORPORATION
MG3641A/MG3642A
Synthesized Signal Generator
Option 22: FSK ENCODER
Operation Manual
Fifth Edition
•For safety and warning information, please read this
manual before attempting to use the equipment.
•Additional safety and warning information is provided
within the MG3641A/MG3642A Synthesized Signal
Generator Operation Manual. Please also refer to this
document before using the equipment.
•Keep this manual with the equipment.

ii
Safety Symbols
To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Corporation uses the following
safety symbols to indicate safety-related information. Ensure that you clearly understand the meanings of the
symbols BEFORE using the equipment. Some or all of the following symbols may be used on all Anritsu
equipment. In addition, there may be other labels attached to products that are not shown in the diagrams in this
manual.
Symbols used in manual
This indicates a very dangerous procedure that could result in serious injury or
death if not performed properly.
This indicates a hazardous procedure that could result in serious injury or death if
not performed properly.
This indicates a hazardous procedure or danger that could result in light-to-severe
injury, or loss related to equipment malfunction, if proper precautions are not taken.
Safety Symbols Used on Equipment and in Manual
The following safety symbols are used inside or on the equipment near operation locations to provide information
about safety items and operation precautions. Ensure that you clearly understand the meanings of the symbols
and take the necessary precautions BEFORE using the equipment.
This indicates a prohibited operation. The prohibited operation is indicated
symbolically in or near the barred circle.
This indicates an obligatory safety precaution. The obligatory operation is
indicated symbolically in or near the circle.
This indicates a warning or caution. The contents are indicated symbolically in or
near the triangle.
This indicates a note. The contents are described in the box.
These indicate that the marked part should be recycled.
MG3641A/MG3642A
Synthesized Signal Generator Option 22: FSK ENCODER
Operation Manual
10 January 1997 (First Edition)
1 September 2006 (Fifth Edition)
Copyright © 1997-2006, ANRITSU CORPORATION.
All rights reserved. No part of this manual may be reproduced without the prior written permission of the
publisher.
The contents of this manual may be changed without prior notice.
Printed in Japan
DANGER
WARNING
CAUTION

iii
Notes On Export Management
This product and its manuals may require an Export License/Approval by
the Government of the product's country of origin for re-export from you
r
country.
Before re-exporting the product or manuals, please contact us to confirm
whether they are export-controlled items or not.
When you dispose of export-controlled items, the products/manuals need
to be broken/shredded so as not to be unlawfully used for military purpose.

iv
CE Conformity Marking
Anritsu affixes the CE Conformity marking on the following product(s) in
accordance with the Council Directive 93/68/EEC to indicate that they
conform to the EMC and LVD directive of the European Union (EU).
CE marking
1. Product Model
Option: MG3641A/MG3642A-22 FSK ENCODER
2. Applied Directive and Standards
When the MG3641A/MG3642A-22 FSK ENCODER is installed in the
MG3641A/MG3642A, the applied directive and standards of this unit
conform to those of the MG3641A/MG3642A main frame.
PS: About main frame
Please contact Anritsu for the latest information on the main frame
types that MG3641A/MG3642A-22 can be used with.

v
C-tick Conformity Marking
Anritsu affixes the C-tick marking on the following product(s) in
accordance with the regulation to indicate that they conform to the EMC
framework of Australia/New Zealand.
C-tick marking
1. Product Model
Option: MG3641A/MG3642A-22 FSK ENCODER
2. Applied Directive and Standards
When the MG3641A/MG3642A-22 FSK ENCODER is installed in the
MG3641A/MG3642A, the applied directive and standards of this unit
conform to those of the MG3641A/MG3642A main frame.
PS: About main frame
Please contact Anritsu for the latest information on the main frame
types that MG3641A/MG3642A-22 can be used with.

vi

I
Table of Contents
1. Overview .................................................................................................................. 1
1.1 Outline of the Product ............................................................................................................... 1
1.2 Unit Configuration ..................................................................................................................... 1
1.3 Specifications............................................................................................................................ 1
2. Preparation Before Use ............................................................................................ 2
2.1 Attaching the Data and Clock Connector Labels ...................................................................... 2
3. Outline of Operation ................................................................................................. 3
4. DETAILED DESCRIPTION ...................................................................................... 5
4.1 2 level FSK ............................................................................................................................... 5
4.2 4 level FSK ............................................................................................................................... 5
5. REMOTE CONTROL USING GPIB.......................................................................... 6
5.1 Overview ................................................................................................................................... 6
5.2 Command Tree ......................................................................................................................... 7
5.3 Details of Commands ............................................................................................................... 8
APPENDIX SETTINGS AT SHIPMENT ........................................................................ 9

II
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.

1
1. Overview
1.1 Outline of the Product
The FSK encoder is an option for the MG3641A and MG3642A synthesized signal generators. The FSK encoder is built
into the internal signal source (Int2 or Int3) of the MG3641A or MG3642A. The FSK encoder is combined with the FM
function of the MG3641A or MG3642A to generate the 2 level or 4 level FSK modulation signal by the external TTL signal.
1.2 Unit Configuration
The table below lists the unit configuration of the FSK encoder.
Table 1.1 Standard configuration
Item Model and symbol Product name Quantity
Main unit MG3641 A/MG3642A-22 FSK ENCODER 1
Accessory
Z0315A
Label
1
Z0315B 1
W1219AE Operation manual 1
1.3 Specifications
The specifications of the FSK encoder are shown below.
Table 1.2 FSK encoder specifications
ycneuqerF
tfihs
tnuoma
2ataD
1
2,
0
0,0eulavtesnoitaivednoitaludomycneuqerF–
1,03/)eulavtesnoitaivednoitaludomycneuqerF(–
0,1eulavtesnoitaivednoitaludomycneuqerF+
1,13/)eulavtesnoitaivednoitaludomycneuqerF(+
ycneuqerF
tes
eerF.tupniatadtaycneuqerfstfihS
girTesiR.kcolclanretxefoegdegnisirtaycneuqerfstfihS
girTllaF.kcolclanretxefoegdegnillaftaycneuqerfstfihS
dnabesaB
retlif
epytretliFretliflesseBht01
ycneuqerfffo-tuC)Bd3–(zHk03otzH001
noituloserteS )zHk03,k92,k82,...,k2.1,k1.1,k0.1,...,021,011,001(stigid2reppU
etuorlangiS.detcelesebnacretlifdnabesabehtrossapyB
ycaruccanoitaivedycneuqerF dnaA1463GMehtfoycaruccanoitaivedMFehthtiwecnadroccanI
.dessapybsiretlifehtnehwylnOA2463GM
lanretxE
noitaludom
langis
tupni
ataD 2
0
)desurotcennoc2tnoCdoMtnI(nwod-llup,levelLTT,rotcennocCNBraeR
2
1
)desurotcennoc1tnoCdoMtnI(nwod-llup,levelLTT,rotcennocCNBraeR
kcolCtxE )desurotcennoc3tnoCdoMtnI(pu-llup,levelLTT,rotcennocCNBraeR

2
2. Preparation Before Use
For details on the environmental conditions of the installation location, safety measures, and preparation before power-on,
refer to Section 2 in the operation manual of the MG3641A/MG3642A.
This section describes the preparations before using the FSK encoder.
2.1 Attaching the Data and Clock Connector Labels
Data and clock signals are entered externally into the FSK encoder.
Int Mod Cont 1, 2, and 3 on the rear panel are assigned as input connectors as shown in the figure below.
Attach the connector label to avoid errors in connecting the cables to the connectors. Attach the label above the Int Mod
Cont connectors so that it can be seen easily as shown in the figure below.
FSK Encoder(Int2)
Data2
1
(TTL) Data2
0
(TTL) EXT Clock(TTL)
Int Mod Cont
1 2 3

3
3. Outline of Operation
1 Press the [Modulation] key to open the "Modulation" menu.
2 Use the "↓" [F2] or "→" [F3] keys to select a set item (On/Off or modu-
lation signal source) to be changed on the [FM1] or [FM2] line (charac-
ters are displayed in reverse video).
3 Press the "Sel" [F1] keys to set [FM1] or [FM2] to On.
Select Int2 or Int3 (modulation signal source to which the FSK encoder
is inserted) as a modulation signal source.
Use the ten-key pad, step keys in the Edit zone, or rotary knob to set the
FM deviation.
4 Press the "Src" [F4] key to open the "Audio Source" menu.
5 Use the "↓" [F2] or "→" [F3] keys to select the "LPF Bypass" part on the
line of [Int2] or [Int3] (modulation signal source to which the FSK en-
coder is inserted) (characters are displayed in reverse video).
6 When using the built-in baseband filter, press the "Sel" key to display
"LPF****Hz", then use the ten-key pad, step keys in the Edit zone, or
rotary knob to set the cut-off frequency (–3 dB) of the filter.
When the "Sel" key is pressed repeatedly, the toggle display begins with
"LPF Bypass" followed by "LPF****Hz", then returns to "LPF Bypass."
LPF Bypass: The built-in baseband filter is not used (the filter is bypassed).
LPF****Hz: The built-in baseband filter is used.
Note: The asterisks (****) indicate a cut-off frequency (one of the set val-
ues of four characters on the right).
Main menu (1)
Mod Swp AF Mem
↑
1
Ofs
Modulation
[AM] Off Int1 0.0%
[FM1] On Int3 0.000 kHz
[FM2] Off Int1 0.000 kHz
[PM] Off 50 Ω
Sel ↓ → Rtn
↑
3
↑ ↑
2
↑
4
Src
Audio Source
[Int1] 1kHz Sin
[Int2] 1000.00 Hz Sin
[Int3] LPF Bypass Free
[Ext1] AC-Couple
[Ext2] AC-Couple
Sel ↓ → Rtn
↑
6
,
8
↑ ↑
5 , 7
• Set cut-off frequency value of baseband filter
100 110 120 130 •••• 980 990
1.0 k 1.1 k 1.2 k 1.3 k •••• 9.8 k 9.9 k
10k 11k 12k 13k •••• 29k 30k

4
7 Use the "↓" [F2] or "→" [F3] keys to select the Free part on the line of [Int2] or [Int3] (modulation signal source to
which the FSK encoder is inserted) (characters are displayed in reverse video).
By pressing the "Sel" key to display Trig ↑or Trig ↓, the external modulation data (Data20and Data21) can be fetched
at the edge of the clock signal entered from the "Ext Clock" connector.
When the "Sel" key is pressed repeatedly, the display begins with "Free" followed by "Trig ↑" and "Trig ↓", then returns
to "Free."
Free: Data entered to the external modulation data input connectors (Data20and Data21) is used immeadiately data
is entered.
Trig ↑: Data entered to the external modulation data input connectors (Data20and Data21) is triggered at the leading
edge of the clock entered from the "Ext Clock" connector and fetched.
Trig ↓: Data entered to the external modulation data connectors (Data20and Data21) is triggered at the trailing edge
of the clock entered from the "Ext Clock" connector and fetched.
Sync: Free
Fout is determined at a logical
change of 2
0
and 2
1
.
H
L
H
L
fc+∆f
fc+∆f/3
fc
fc–∆f/3
fc–∆f
Data 2
1
Data 2
0
Fout
Sync: Triggered (Trig ↑)
Fout is determined in accordance
with the status of 20or 21when
Clk rises or falls without depending
on a logical change of 20and 21.
H
L
H
L
fc+∆f
fc+∆f/3
fc
fc–∆f/3
fc–∆f
Data 21
Data 20
Fout
H
L
Clk
fc: Carrier frequency
∆f: Set FM deviation value

5
4. DETAILED DESCRIPTION
This section explains how to use the MG3641A/MG3642A with the MG3641A/MG3642A-22 (FSK ENCODER) to gener-
ate the FSK modulation signal (2 level or 4 level).
4.1 2 level FSK
For 2 level FSK, enter the modulation signal data (0 or 1 in TTL level) from the test signal generator to the Data21connector
on the rear panel. When synchronizing the modulation signal data to the external clock signal, enter the clock signal to the
Ext Clock connector to set the FSK trigger (see Section 2). Table 4.1 lists the relationships between the modulation signal
data and output frequencies.
The frequency and FM deviation accuracies at this time become the specified values of the MG3641A and MG3642A
(Only when the filter is bypassed).
Trigger Clock
Data (0 or 1)
EXt Clock
Data 21
Data 20
Test signal
generator
MG3641A/42A
Table 4.1
Modulation signal data Output frequency
0
1
fc –∆f
fc + ∆f
•fc: Carrier frequency of MG3641A or MG3642A
•∆f: Set FM deviation value
(Because both Data2
0
and Data2
1
connectors are pulled-down internally,
set the Data2
0
input to Open for 2 level FSK.)
Open
4.2 4 level FSK
For 4 level FSK, enter the modulation signal data (00, 01, 11, or 10 in TTL level) from the Data20and Data21connectors on
the rear panel.
When synchronizing the modulation signal data to the external clock signal, enter the clock signal to the Ext Clock connec-
tor to set the FSK trigger (see Section 2).
Table 4.2 lists the relationships between the modulation signal data and output frequencies.
The frequency and FM deviation accuracies at this time become the specified values of the MG3641A and MG3642A
(Only when the filter is bypassed).
Trigger Clock
Data (0 or 1)
Data (0 or 1)
EXt Clock
Data 2
1
Data 2
0
Test signal
generator
MG3641A/42A
Table 4.2
Modulation signal data Output frequency
2
1
0
0
1
1
2
0
0
1
1
0
fc –∆f
fc –∆f/3
fc + ∆f/3
fc + ∆f
•fc: Carrier frequency of MG3641A or MG3642A
•∆f: Set FM deviation value

6
5. REMOTE CONTROL USING GPIB
5.1 Overview
The MG3641A/MG3642A-22 (FSK ENCODER) unit is an optional unit for the MG3641A and MG3642A synthesized
signal generators. As other functions of the MG3641A or MG3642A, the MG3641A/MG3642A-22 can be combined with
an external controller and other measuring instruments to automate measurement.
The MG3641A/MG3642A-22 conforms to the Institute of Electrical and Electric Engineers (IEEE) standard 488.1, 1987.
The software specifications conform to IEEE488.2 and Standard Commands for Programmable Instruments (SCPI).
This section describes the GPIB command tree and details of commands of the MG3641A/MG3642A-22.
For other descriptions, refer to Section 6, "Remote Control Using GPIB" in the separate volume, "MG3641A/42A Synthe-
sized Signal Generator Operation Manual."

7
5.2 Command Tree
1 When the FSK encoder is set to Int2:
:LFSourse :LPF2
:LPF2?
:TRIG3
:TRIG3?
<Numeric> <Freq term>
<Character>
<Character>
2 When the FSK encoder is set to Int3:
:LFSourse :LPF3
:LPF3?
:TRIG3
:TRIG3?
<Numeric> <Freq term>
<Character>
<Character>

8
5.3 Details of Commands
:LFSource:LPF2 <Numeric> or <Character>
Function: Sets the baseband filter of internal modulation signal source 2 (for the FSK encoder).
Parameters: <Character>BYPASS (The internal filter is bypassed.)
<Numeric>: 100 Hz to 30 kHz
Unit: <Freq term>
No unit for BTPASS
Restriction: None
:LFSource:LPF2?
Function: Reads out the set contents of the baseband filter of internal modulation signal source 2 (for the FSK
encoder).
Response: Cut-off frequency or BYPASS of the set baseband filter.
Restriction: None
:LFSource:TRIG2<Character>
Function: Sets the trigger function of internal modulation signal source 2 (for the FSK encoder).
Parameter: <Character> = Free (The trigger function is not used.)
RISE (Synchronized when the external clock rises.)
FALL (Synchronized when the external clock falls.)
Unit: None
Restriction: None
:LFSource:TRIG2?
Function: Reads out the set contents of the trigger function of internal modulation signal source 2 (for the FSK
encoder).
Response: Set trigger function.
Restriction: None
If the FSK encoder is set to Int3, replace "2" in each command by "3."

9
APPENDIX SETTINGS AT SHIPMENT
Setting item
Baseband filter Bypass
Baseband filter cut-off frequency 10 kHz
Trigger Free

10
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