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Em HEWLETT
PACKARD

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70 MHz
MODULATOR-DEMODULATOR

SERIAL NUMBERS

This manual applies directly to the instru-
ment with serial number 2028UOO160.
For additional information about serial
numbers, see INSTRUMENTS COVERED
BY MANUAL in Section I and SECTION
VII MANUAL CHANGES.

0 Copyright HEWLETT-PACKARD LIMITED 1981
SOUTH QUEENSFERRY DIVISION, WEST LOTHIAN, SCOTLAND

Manual Part Number 03717-90000
Microfiche Part Number 03717-90025 Printed : June 1981
COPYRIGHT AND DISCLAIMER NOTICE

Copyright - Agilent Technologies, Inc. Reproduced with the permission of Agilent
Technologies Inc. Agilent Technologies, Inc. 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. Agilent Technologies, Inc. is not liable for errors
contained herein or for incidental or consequential damages in connection with the
furnishing, performance, or use of this material or data.
Model 37 17A

LIST OF CONTENTS

SECTION I
GENERAL INFORMATION

Paragraph l-1 INTRODUCTION. ............................ Page
1-2 SPECIFICATIONS ............................
1-3 SAFETY CONSIDERATIONS ....................
l-4 DESCRIPTION ...............................
1-5 INSTRUMENTS COVERED BY MANUAL .........
1-6 OPTIONS ................................... ..--...-.
I-7 HEWLETT-PACKARD INTERFACE BUS ..........
I-8 ACCESSORIESSUPPLIED ......................
1-9 RECOMMENDED TEST EQUIPMENT .............

Figure l-l 3717A Modulator-Demodulator and Accessories,
l-2 Typical Test Setup

Table l-l Specifications ...................................................
1-2 RecommendedTestEquipment .....................................

SECTION II
INSTALLATION

Paragraph 2-I INTRODUCTION ............................................. .Page 2-I
2-2 INITIALINSPECTION ............................................ 2-1
2-3 PREPARATION FOR USE ................... 2-1
24 HP-IB ADDRESS SELECTION ................ 2-2
2-5 EMPHASIS NETWORK INSTALLATION ......... 2-3
2-6 INTERCONNECTIONS ..................... 2-3
2-7 MATING CONNECTORS .................... 2-3
2-8 OPERATING ENVIRONMENT ............... 2-4
2-9 BENCH OPERATION ........................ 24
2-10 RACK MOUNTING ........................ 24
2-1 1 STORAGE AND SHIPMENT ................. 2-4

Figure 2-1 Line Voltage and Fuse Selection ..................................... 2-1
2-2 Power Cable and Mains Plug Part Numbers. ............................ 2-2
2-3 The HP-IB Address Switch shown as set by the Factory. .................. 2-3
24 Hewlett-Packard Interface Bus Connection. ............................ 24
2-5 Jack Plug Connections ......................................... 2-5

Table Allowable HP-IB Address Codes

ii
List of contents

SECTION I I I
OPERATION

Paragraph 3-1 INTRODUCTION ..................
3-2 OPERATING CHARACTERISTICS ....
3-3 PANEL FEATURES ................
3-4 OPERATORS CHECKS .............
3-5 TURN-ON CONDITIONS ............
3-6 LOCAL OPERATION ...............
3-7 REMOTE OPERATION .............
3-8 HP-IB Compatability ................
3-9 Remote Mode. ....................
3-l 0 LocalMode .......................
3-I 1 Addressing. .......................
3-12 Data Messages .....................
3-13 Receiving The Data Message ..........
3-14 Receiving The Clear Message. .........
3-l 5 Receiving The Remote Message.
3-I 6 Receiving The Local Message. .........
3-l 7 Receiving The Abort Message .........

Figure 3-1 Front and Rear Panel Features ........ 3-2

Table 3-l HP-IE Message Reference Table. ....... :.,:
3-2 HP-16 Program Codes ...............

SECTION IV
PERFORMANCE TESTS

Paragraph 4-l INTRODUCTION., ................................... 4-l
4-2 OPERATION VERIFICATION., ......................... 4-l
4-3 TEST RECORD ...................................... 4-I
44 PERFORMANCE VERIFICATION PERIOD ................ 4-I
4-5 EQUIPMENT REQUIRED .............................. 4-2
4-6 RETURN LOSS TESTS ................................. 4-3
4-7 PRE-EMPHASIS & SENSITIVITY TEST ................... 4-7
4-8 BB INPUT & BB OUTPUT SENSITIVITY TEST ............. 4-13
4-9 BB-IF SWEPT RESPONSE TEST ......................... 4-16
4-l 0 IF OUTPUT TEST .................................... 4-18
4-l 1 IF-BB SWEPT RESPONSE TEST ......................... 4-l 9
4-12 VIDEO DIFF GAIN/PHASE TEST ........................ 4-21
4-13 50Hz SQUARE WAVE TILTTEST ....................... 4-23
4-14 BB-to-BB RESPONSE & SENSITIVITY TEST ............... 4-25
4-15 OPTION 004 - BB-to-BB FREQUENCY RESPONSE TEST .... 4-28
4-16 TELEPHONY SPURIOUS RESPONSE TEST ................ 4-30
4-1 7 1800CHANNEL NOISE LOADING TEST .................. 4-31
4-I 8 ATTENUATOR RANGE & FREQUENCY RESPONSE TEST ... 4-33
4-19 HP-IB FUNCTIONAL TEST ............................. 4-35
Model 371lA

Figure 4-1 DC Offset Circuit for Network Analyzer. 4-2
4-2 BE Return Loss Test.. 4-4
43 Balanced Return Loss Test 4-5
4-4 IF Return Loss 4-6
4-5 CCI R Pre-/De-Emphasis Characteristics. 4-7
4-6 3717A Emphasis Shape Configuration 4-8
4-7 Internal Location of A31Jl. 4-9
4-8 Pre-Emphasis & Sensitivity Test 4-9
4-9 BB Input Sensitivity Test 4-14
4-l 0 5OHz Square Wave Specification. 4-23
4-1 1 50Hr Square Wave Tilt Test 4-23
4-12 BB-to-BB Frequency Response Test 4-25
4-13 Option 004 BB-to-BB Frequency Response Test. 4-28
4-14 Internal Location of W2 and W15.. 4-29
4-I 5 Principle of NPR Measurements 4-31
4-l 6 Telephony Noise Loading Test 4-32
4-I 7 Attenuator Range & Low Frequency Response Tesi 4-33

Table 4-l Performance Tests & Operation Verification. 4-l
4-2 CCIR Emphasis Characteristics. 4-10
4-3 BELL Pre-Emphasis Characteristics. 4-1 1
44 VIDEO Pre-Emphasis Characteristics. 4-12
4-5 Maximum Frequency of Emphasis Networks 4-27
Performance Test Record 4-37

SECTION V
ADJUSTMENTS

Paragraph 5-1 INTRODUCTION., Page 5-1
5-2 EQUIPMENT REQUIRED 5-1
5-3 SAFETY CONSIDERATIONS.. 51
54 ADJUSTMENT LOCATIONS. .`. 5-1
5-5 PRELIMINARY PROCEDURE.. _. 5-6
5-6 POWER SUPPLY CHECKS AND ADJUSTMENTS.. 5-6
5-7 IF OUTPUT RETURN LOSS ADJUSTMENT.. 5-7
5-8 AFC ADJUSTMENTS. 5-9
5-9 MODULATOR ADJUSTMENT.. 5-10
5-10 IF LEVEL AND FLATNESS ADJUSTMENTS. ., .~ 5-12
5-1 1 AGC ADJUSTMENTS.. 5-13
5-I 2 TELEPHONY INPUT SENSITIVITY ADJUSTMENT 5-17
5-13 VIDEO INPUT SENSITIVITY ADJUSTMENT.. 5-20
5-l 4 BASEBAND OUTPUT SENSITIVITY, ADJUSTMENT.. 5-21
5-15 BASEBAND INPUT FLATNESS ADJUSTMENTS.. 5-22
5-I 6 BASEBAND OUTPUT FLATNESS ADJUSTMENTS., 5-25
5-17 EMPHASIS AND DE-EMPHASIS ADJUSTMENTS 5-28
5-I 8 BACK TO BACK DISCRIMINATOR ADJUSTMENTS.. ::: :: 5-33

iv
List of Contents

Figure 5-l A6 Adjustment Locations ........................... 5-6
5-2 Return Loss Setup ................................. 5-7
5-3 Al 2 Adjustment Locations and Position of Al 2Wl ....... 5-8
5-4 Al4 Adjustment Locations,, ........................ 5-9
5-5 Modulator Adjustment Setup & Location of Al 3Pl and P2 5-10
5-6 IF Level and Flatness Setup and Al 2 Adjustment Locations 5-12
5-7 Return Loss Setup. ................................ 5-14
5-8 A21 Adjustment Locations .......................... 5-14
5-9 IF input Flatness Setup and Location of A21Wl ......... 5-15
5-10 Telephony Input Sensitivity Setup and Location of A13Pl 5-17
6-I 1 A31 Adjustment Locations .......................... 5-18
5-1 2 Telephony Sensitivity Setup. ........................ 5-18
5-l 3 A32 Adjustment Locations. ......................... 5-19
5-I 4 Video input Sensitivity Setup ........................ 5-20
5-l 5 A33 Adjustment Locations. ......................... 5-2 1
5-I 6 BB Input Flatness Setup and Location of A32J3 and A31Jl 5-23
5-17 A31, A32 and A33 Adjustment Locations .............. 5-25
5-I 8 BB Output Flatness Setup and Location of A31J2 5-26
5-I 9 A31 and A33 Adjustment Locations ................... 5-28
5-20 CCI R Emphasis Setup. ............................. 5-29
5-21 A50 Adjustment Locations .......................... 5-30
5-22 Back to Back De-Emphasis Setupand Location of A31Jl/J2 5-31
5-23 Optimization Setup 1 .............................. 5-33
5-24 Optimization Setup 2 .............................. 5-34
5-25 NPRSetup.. .................................... 5-35
5-26 Return Loss Setup. ................................ 5-37

Table 5-l 3717A Adjustable Components. ...................... 5-2
5-2 Related Adjustments. .............................. 5-5
5-3 Factory Selected Components., ...................... 5-5
54 CCIR Emphasis Network Details ...................... 5-29
5-5 Flatness Adjustment Analyzer Settings ................. 5-32

SECTION VI
REPLACEABLE PARTS

Paragraph 6-l INTRODUCTION .............................. 6-1
63 ABBREVIATIONS ............................. 6-1
6-5 REPLACEABLE PARTS LIST. ................ .-. 6-1
6-7 ORDERING INFORMATION ..................... 6-1
6-10 DIRECT MAIL ORDER SYSTEM ................. 6-I

Figure 6-l Cabinet and Chassis Mounted Parts 6-57

Table 6-l Reference Designations and Abbreviations ......... 6-2
6-2 Replaceable Parts .. ................. 6-4
6-3 Manufacturers Code List. ......... ............ 6-57
Model 37 17A

SECTION VII
MANUAL CHANGES

Paragraph 7-1 ,MANUAL BACKDATING .`. .Page 7-I
7-2 MANUAL UPDATING,. .,. 7-1

SECTION VIII
SERVICE

Paragraph 8-l INTRODUCTION,. 8-l
8-2 SAFETY CONSIDERATIONS,, 8-1
83 RECOMMENDED TEST EQUIPMENT.. 8-l
8-4 SERVICESHEETS............................ 8-l
8-5 THEORY OF OPERATION 8-1
8-6 TROUBLESHOOTING, 8-4
8-7 TEST EQUIPMENT . ". 84
8-8 PRELIMINARY TROUBLESHOOTING PROCEDURE 8-4
8-9 TELEPHONY OPERATION CHECK 8-4
8-l 0 VIDEO OPERATION CHECK 8-5
8-l 1 SERVICE CHANNEL OPERATION CHECK.. 8-8
8-l 2 MODULATOR SECTION TROUBLESHOOTING 8-6
8-l 3 DEMODULATOR SECTION TROUBLESHOOTING.. 8-7

Figure 8-1 Simplified Block Diagram,, ................................ 8-l
8-2 Prs-Emphasis Curves, ..................................... 8-2
83 Location of Assemblies. ................................... 8-8
84 Block Diagram ........................................... 8-9

Table 8-l ServiceSheet Index ....................................... 8-3
8-2 Emphasis Levels ......................................... 8-5

SERVICE SHEET 1
Paragraph 8-14 INTRODUCTION ........................................ Page E-IO
8-15 CIRCUIT DESCRIPTIONS (INPUT SIDE), .................... 8-10
8-16 CIRCUIT DESCRIPTIONS (OUTPUT SIDE) .................... 8-10
8-l 7 CIRCUIT DESCRIPTION (BALANCED INPUTS/OUTPUTS). ..... 8-I 0
E-18 TROUBLESHOOTING A32 ................ .; .............. 8-l 0
8-19 A50 TROUBLESHOOTING ................................ 8-l 0

Figure 8-5 CCI R Telephony Pre-Emphasis Network. ...................... 8-10
8-6 BELL Telephony or Video Pre-Emphasis Network ............... 8-l 0
8-7 CCIR De-Emphasis Network .................................. 8-l 0
8-8 BELL Telephony or Video De-Emphasis Network ............... 8-10
8-9 A32 Component Location. ................................. 8-12
8-I 0 A34 Component Location. ................................. E-12
8-l 1 A32!A34 Schematic Diagram ............................... 8-13
8-l 2, A50 Component Location. ................................. 8-14
E-13 A50 Schematic Diagram ................................... 8-15
........... Page 8-27
8-29 Component Location ......................... .............. 8-27
8-30 Al 2/Ail Schematic Diagram ................... .............. 8-27

SERVICE SHEET 6

Paragraph 8-41 INTRODUCTION ............................. ............. Page 8-28
842 CIRCUIT DESCRIPTIONS ...................... ................ 8-28

Figure 8-31 A3 Component Location. ... :. .................. 8-29
8-32 A4 Component Location. ....................... 8-29
8-33 A3/A4 Schematic Diagram ...................... 8-29

SERVICE SHEET 7

Paragraph 843 INTRODUCTION ............................. ............. 8-30
844 CIRCUIT DESCRIPTIONS., .................... ............. 8-30
845 HP-IB TROUBLESHOOTING. ................... ............. 8-30

Figure 8-34 A9 Component Location. ....................... 8-32
8-35 Al 0 Component Location. ...................... ................ 8-32
8-36 A9/AlO Schematic Diagram ..................... ................ 8-33

SERVICE SHEET 8

Paragraph 8-46 CIRCUIT DESCRIPTION.. .: Page 8-34

Figure 8-37 A2 Component Location. ....................... 8-34
8-38 A2 Schematic Diagram ......................... 8-34

SERVICE SHEET 9

Paragraph 8-47 INTRODUCTION,, ........................... .Page 8-35
848 CIRCUIT DESCRIPTION ....................... a-35

Figure 8-39 A6 Component Location. ..................... 8-36
8-40 A6 Schematic Diagram ......................... 8-37
Model 3717A

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Figure l-l 3717A Modulator-Demodulator and Accessories
General Information

SECTION I
GENERAL INFORMATION

1-1 INTRODUCTION safety is presented at appropriate places throughout the
manual.
This Operating and Service Manual. contains information
required to install, operate, test, adjust and service the 1-4 DESCRIPTION
Hcwlctt-Packard Model 37 17A Modulator-oemodulator,
Figure l-l shows the 3117A and the accessories supplied. The HP3717A Modulator-L)emodulator is a portable test
modem for use on 70MHz IF microwave radio links. Its
This section of the manual describes the instrument and primary function is to enable baseband to baseband
includes information On identification, accessories, specifi- (BB-BB) measurements such as white noise loading and
cations, safety and other basic information. video waveform measurements to be made at non-
demodulating repeater stations. It can also be used 86 a
Listed on the title page of this manual is a microfiche part substitute for the radio link modulator and/or demodula-
number. This number can be used to order 4 x 6 inch toI. All the inputs and outputs are designed to interface
microfilm transparencies of the manual. Each microfiche with equipment manufactured to the pertinent CCIR or
contains UP to 96 photo duplicates of the manual pages. BELL recommendations.
The microfiche package also includes the latest Manual
Two BB inputs and two BB outputs are provided, one each
Changes supplement,
for Telephony and one each for Video. Variable gain allows
the modulator to operate with BB input levels OVCI a 12dB
1-2 SPECI FICATIDNS range. An AFC system allows the demodulator to operate
with IF input levels over a 16dB range, video signals can be
Instrument specifications are listed in Table l-1. These inverted in both the modulator and demodulator sections
specifications are the performance standards against which
so that the 3717A may be used with any modulation
the instrument is tested. scheme. Two independent IF outputs arc provided, one to
supply the sy?.tem being tested, the other to be used as a
1-3 SAFETY CONSIDERATIONS monitor point if required. Available as an option in addi-
tion to the normal Telephony input and Telephony output
.I`his Safety Class 1 instrument (provided with a protective
is a balanced Telephony input and balanced Telephony out-
earth terminal) has been designed and tested according to
put at 124 Ohm impedance.
international safety standards. Information with regard to

Figure l-2 Typical Test Setwp
Model 311lA

A selection of optional pre/de-emphasis networks is avail- Option 006 deletes the modulator section.
able which cover the range from 24 to 1800 channel and Option 007 deletes the demodulator section.
525, 625 and 819 linevideo according to CCIR recommen-
dations 275-l and 405-l and the range 600 to 1800 channel Option 136 is a combination of options 003 and 006.
according to BELL recommendations 457A/B/D/E. UP to Option 137 is a combination of options 003 and 007.
five pm/de-emphasis networks can be fitted in the 3717A at Option 146 is a combination of options 004 and 006.
any one time, selection being by front panel pushbutton
keys, 01 optionally by remote control via Ihe HP-IB. Option 147 is B combination of options 004 and 007.
Options 011 to 018 are the telephony emphasis networks
1-5 INSTRUMENTS COVERED BY MANUAL which are manufactured to CCIR recommendations, they
are as follows:
Attached to the instrument is a serial number plate. The 0 11 24 channel loading 015 600 channel loading
serial number is in the form: OOOOUOOOOO. is in twoIt 0 12 60 channel loading 016 960 chamml loading
parts the first four digits and the letter are the serial prefix 013 120 channsl loading 017 1260 channel loading
and the last five digits are the suffix. The prefix is the same 014 300 channel loading 0 18 1800 channel loading
for all identical instruments it changes only when a change Options 021 to 023 are the video emphasis networks
is made to the instrument. The suffix, however, is assigned which are manufactured to CCIR recommendations, they
sequentisdly and is different for each instrument. The are as follows:
contents of this manual apply to instruments with the 021 525 line 022 625 line 023' 819 line
serial number prefix listed under SERIAL NUMBERS on
the title page. Options 031 to 035 are the telephony emphasis networks
which are manufactured to BELL recommendations, they
An instrument manufactured after the printing of this are as follows:
manual may have & serial number prefix that is no1 listed 031 600 channel loading 034 1500 channel loading
on the title page. This unlisted serial number prefix indi- 032 900 channel loading 035 1800 channel loading
cates the instrument is different from those described in 033 1200 channel loading
this manual. The manual for this newer instrument is
accompanied by a Manual Changes supplement. This Additional emphasis networks may be obtained by ordering
supplcmcnt contains `change information' that explains the HP part number given in the Replaceable Parts List for
how to adapt the manual to the newer instrument. the appropriate A50 Assembly.
In addition to change information, the supplement may Option 100 provides remote control of the tislrument via
contain information fox correcting errors in the manual. To the HP-IB, refer to paragraph 1-7 fox further details.
keep this manual as current and accurate as possible,
Hewlett-Packard recommends that you periodically request Rack Flange Kit. The HP 3717A can be mounted in a
standard instrument rack without front handles with the
the latest Manual Changes supplement. The supplement for
rack flange kit. Order HP part number 5061-0074.
this manual is identified with the manual print date and
part number, both of which appear on the manual title Rack Flange and Front Handle Combination Kil. The
page. Complimentary copies of the supplement are available 3717A can be mowited with front handles in a standard
from Hewlett-Packard. instrument rack. The kit is made up of unique parts which
combine both functions. Order HP part number 50610075.
For information concerning a serial number prefix that is
not listed on Ihe title page or in the Manual Changes supple- 1-7 HEWLETT-PACKARD INTERFACE BUS
ment, contact your nearest Hewlett-Packard office.
1-6 OPTIONS
When HP-IB interface (Option 100) is fitted it can be used
Options are available to, change the front pans1 connectors, with any HP-IB compatible computing controller or com-
delete either the modulator or demodulator, supply a range puter for automatic systems applications. HP-IB is Hewlett-
of emphasis networks, provide remote control via the Packard's implementation of IEEE Standard 488-1978.
HP-IB, to convert the instrument to rack mounting with or The 3717A is compatible with The HP-IB to the extent
without front handles. indicated by the following function codes: SHO, AkII, TO,
TEO, L2, LEO, SRO, RL2, PPO, DC1, DTO, CO. For more
Option 003 substitutes Siemens 1.56/6.5mm front panel
detailed information relating to remote operation of the
connectors for the standard BNC connectors.
HP 3717A, refer to Section III of this manual.
Option 004 substitutes commercial equivalents of WECO
477B type connectors for the standard BNC connectors HP-IB Address Selection. The HP-IB address switches are
and adds additional Telephony inputs and Telephony out- locared inside the 37 17A. To determine the 37 17A address,
puts at 124 Ohm balanced impedance. refer Eo Section II1 of this manual.