Tektronix RFA300A User Manual
User Manual
RFA300A
Measurement Set 8VSB
071-0697-01
www.tektronix.com
Copyright © Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications a nd pric e change privileges reserved.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If a product proves defec tive during this
warranty period, Tektronix, at its option, either will re pair the defective product without charge for parts and labor,
or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suita ble arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any othe r charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix re presentatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or i ntegration increases the time
or difficul ty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS W ARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Getting Started
General Safety Summary vii.........................................
Preface ix........................................................
Related Documentation ix...........................................
Contacting Tektronix x.............................................
Getting Started 1--1............................................
Product Description 1--1..............................................
Accessories 1--4.....................................................
Installation 1--5...............................................
Check the Shipping List 1--5...........................................
Operating Requirements 1--6...........................................
Hardware Installation 1--6.............................................
Creating a Startup Disk 1--13...........................................
RF Connections 1--14.................................................
Interface Connections 1--16.............................................
Keyboard and Mouse Connections 1--16...................................
Powering On and Off 1--17.............................................
Selecting RF Input Channel and Channel Freque ncy 1--18....................
Incoming Inspection 1--20..............................................
Operating Basics
Reference
Operating Basics 2--1..........................................
Front Panel 2--1.....................................................
Home Window 2--4..................................................
Making a Measurement 2--6...........................................
Online Help 2--9.....................................................
Backing Up Files 2--10................................................
RFA300A Reference 3--1........................................
Out of Channel Emissions 3--1.........................................
S/N, EVM, and Pilot Amplitude Error 3--3................................
Phase Noise 3--4.....................................................
Frequency Response and Group Delay 3--6...............................
Amplitude and Phase Errors 3--8........................................
Peak-to-Average and Channel Spectrum 3--10..............................
Signal Monitor 3--12..................................................
8VSB Overview 3--14.................................................
Closed-Loop Transmitter Control 3--18...................................
RFA300A Measurement Set 8VSB
i
Table of Contents
Appendices
Appendix A: Specifications A--1..................................
Specification Tables A--1..............................................
Performance Conditions A--1...........................................
RFA300A Measurement Set Specifications A--2............................
Measurement Specifications A--4........................................
Platform Characteristics A--9...........................................
Power Characteristics A-- 13.............................................
Environmental Characteristics A--14......................................
Electromagnetic Compatibility A--16.....................................
Mechanical (Physical) Characteristics A--18................................
Appendix B: User Service B--1...................................
General Care B--1....................................................
Preventive Maintenance B --1...........................................
In Case of Problems B--3..............................................
Repackaging for Shipment B--5.........................................
Appendix C: System Recovery C--1...............................
Overview C--1.......................................................
Restore the BIOS Settings C--3.........................................
Restore the Contents of the Partitions C--4................................
Install and Configure Individual Components C--6..........................
Appendix D: Mask File Formatting D--1...........................
Glossary
Index
ii
RFA300A Measurement Set 8VSB
List of Figures
Table of Contents
Figure 1--1: RFA300A 8VSB Measurement Set front panel 1--2.......
Figure 1--2: Home window 1--3..................................
Figure 1--3: Attaching the extension brackets to the
stationary tracks 1 --8.......................................
Figure 1--4: Mounting hole selection on the front rails of the
equipment rack 1--8........................................
Figure 1--5: Attaching the extension bracket to the rear rail of the
equipment rack 1--9........................................
Figure 1--6: Mounting the stationary section to the front rail of the
equipment rack 1--10........................................
Figure 1--7: Stationary bracket, extension bracket, and
attaching screws 1--10........................................
Figure 1--8: Installing the instrument into the equipment rack 1--11....
Figure 1--9: Transmitter connection 1--14...........................
Figure 1--10: Rear view 1--15.....................................
Figure 1--11: Keyboard and mouse connections 1--16.................
Figure 1--12: On/Standby switch 1--17.............................
Figure 1--13: System setup 1-- 19..................................
Figure 2--1: Front panel 2--1.....................................
Figure 2--2: Home window 2--4..................................
Figure 2--3: Toolbar 2--5........................................
Figure 2--4: Help menu 2--9.....................................
Figure 3--1: Out of Channel Emissions measurement window 3--2.....
Figure 3--2: Out of Channel Emissions setup 3--2...................
Figure 3--3: S/N, EVM, and Pilot Amplitude measurement window 3--3
Figure 3--4: Phase Noise Measurement window 3--5.................
Figure 3--5: Phase Noise setup 3--5...............................
Figure 3--6: Frequency Response and Group Delay measurement
window 3--7...............................................
Figure 3--7: Frequency Response and Group Delay setup 3--7.........
Figure 3--8: Amplitude and Phase Errors measurement window 3--9...
Figure 3--9: Amplitude Error and Phase Error setup 3--9............
Figure 3--10: Peak-to-Average and Channel Spectrum measurement
window 3--10...............................................
RFA300A Measurement Set 8VSB
iii
Table of Contents
Figure 3--11: Peak-to-Average Setup 3--11..........................
Figure 3--12: Signal Monitor measurement window 3--12.............
Figure 3--13: Signal Monitor Setup 3--13...........................
Figure 3--14: 8VSB exciter block diagram 3--14......................
Figure 3--15: Data interleaving 3--15...............................
Figure 3--16: Data segment sync 3--16..............................
Figure 3--17: Frame synchronizing segment 3--17....................
Figure A--1: IF filter characteristics A--3...........................
Figure A--2: 8VSB transmitter emissions mask A--8.................
Figure B--1: Repackaging the instrument (new packagin g) B--6.......
Figure B--2: Repackaging the instrument (old p ackaging) B--8........
Figure B--3: Placement of bottom spacer pad in inner shipping box B--9
iv
RFA300A Measurement Set 8VSB
List of Tables
Table of Contents
T able 1--1: Standard accessories 1--4.............................
Table 1--2: Optional accessories 1--4..............................
Table 1--3: Operating requirements 1--6..........................
Table 2--1: Front panel-key controls 2--2..........................
Table 2--2: Control key combination functions 2--3.................
Table 2--3: Toolbar functions 2--5................................
Table A--1: Input specifications A--2..............................
T able A--2: Measurement specifications A--4.......................
T able A--3: System components A--9..............................
T able A--4: Front panel interface characteristics A--10................
Table A--5: Rear panel interface characteristics A--11................
T able A--6: AC power source characteristics A--13...................
T able A--7: Environmental characteristics A--14.....................
Table A--8: Dynamics A--15......................................
Table A--9: Transportation A--15..................................
Table A--10: Certifications and compliances A--16...................
T able A--11: Mechanical characteristics A--18.......................
Table B--1: Troubleshooting B--4.................................
Table D--1: ResultID Values for Mask Tests D--2....................
RFA300A Measurement Set 8VSB
v
Table of Contents
vi
RFA300A Measurement Set 8VSB
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
ToAvoidFireor
Personal Injury
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
RFA300A Measurement Set 8VSB
vii
General Safety Summary
Symbols and Terms
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual
Protective Ground
(Earth) Terminal
viii
RFA300A Measurement Set 8VSB
Preface
This manual contains operating information for the RFA300A Measurement Set
8VSB. The manual consists of the following sections:
H Chapter 1: Getting Started. Provides a product description, installation
procedures, connection information, and information on getting the
instrument ready for use.
H Chapter 2: Operating Basics. Provides basic information about using the
instrument.
H Chapter 3: Reference. Contains an overview of each measurement window
and of the 8VSB standard.
H Appendix A: Specifications. Lists the environmental, physical, and electrical
properties of the instrument.
H Appendix B: User Service. Provides user service information including
general care, preventive maintenance, troubleshooting, and repackaging.
H Appendix C: Software Installation. Describes how to format a hard drive and
reinstall the operating system software and associated hardware drivers.
Related Documentation
H Appendix D: Mask File Formatting. Describes how to format a mask file
using a text editor.
In addition to this user manual, the following documentation is available for your
measurement set.
H The online help provides information about using the measurement set. To
view online help, select Help Topics from the Help menu.
H The optional RFA300A Measurement Set 8VSB Service Manual provides
board-level service information.
RFA300A Measurement Set 8VSB
ix
Preface
Contacting Tektronix
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Dri ve
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.
x
RFA300A Measurement Set 8VSB
Getting Started
Product Description
This chapter provides basic information about using and installing the RFA300A
Measurement Set 8VSB. There is information about the physical instrument and
introductory material on how to operate it. Once you have a basic understanding,
proceed to the next chapter, Operating Basics, to form a conceptual model of
how the measurement set works.
The measurement set provides information on 8VSB digital television signals in
conformance with the ATSC Digital Television Standard. Signals are acquired at
the transmitter and the measurements consist of the following:
H Complex Modulation Error Ratio
H Signal to Noise Ratio
H Error Vector Magnitude
H Pilot Amplitude Error
H Out-of-Channel Emissions
H Frequency Response Error
H Group Delay
H Amplitude Error
H Phase Error
H Phase Noise Error
H Peak to Average Ratio
H Channel Spectrum (display of the selected channel, not a measurement)
The instrument’s measurements can run continuously, thereby monitoring
transmitter performance on a constant basis. Operation of the instrument is
controlled from the front panel keypad and the touch screen or from an attached
keyboard and mouse. Figure 1--1 shows the front panel of the measurement set.
RFA300A Measurement Set 8VSB
1- 1
Getting Started
Figure 1- 1: RFA300A 8VSB Measurement Set front panel
The measurement set uses the Microsoft Windows NT operating system. The
Home window is the point-of-entry into the program. Access each measurement
from the Home window by clicking on the appropriate icon as shown in
Figure 1--2 on page 1--3.
1- 2
RFA300A Measurement Set 8VSB
RFA300A --Home
Figure 1- 2: Home window
Getting Started
Refer to the next chapters Operating Basics and Reference for an overview on
operating the measurement set. For detail information, refer to the online help.
RFA300A Measurement Set 8VSB
1- 3
Getting Started
Accessories
Table 1--1 and Table 1--2 list the standard and optional accessories.
Table 1- 1: Standard accessories
Description Quantity Part number
RFA300A Measurement Set 8VSB User Manual 1 071-0697-XX
RFA300A Measurement Set 8VSB Application Software on
CD-ROM
Windows NT Software and manual on CD-ROM 1 119-5514-XX
WINNT keyboard (US) 1 119-6216-XX
Tektronix three-button mouse 1 119-4330-XX
Standard IEC power cord, 125 V 1 161-0104-00
Front protective cover 1 200-4408-XX
10 dB Attenuator 1 119-6328-00
Rackmount slides hardware kit 1 -- -- -- -- -- -- -- -- --
1 063-3410-XX
Table 1- 2: Optional accessories
Description Quantity Part number
Accessory pouch 1 016-1441-XX
Power cord options
Opt. A1 Universal Euro 230 V, 50 Hz 1 161-0104-06
Opt. A4 North America 240 V, 60 Hz 1 161-0104-08
1- 4
Portable cabinet kit w/ instructions 1 016-1929-XX
Option D1, Calibration certificate 1 -- -- -- -- -- -- -- -- --
RFA300A Measurement Set 8VSB Service Manual
with
Performance Procedure and Adjustment Procedure software disk
1
1
071-0698-XX
063-3411-XX
RFA300A Measurement Set 8VSB
Installation
Check the Shipping List
Read this section before attempting any installation procedures. This section
describes site considerations, power requirements, and ground connections for
your instrument.
Verify that you have received all of the parts of your measurement set. Use the
shipping lists that came with your instrument to compare against the actual
contents of your order. You should also do the following:
H Verify that you have the correct power cord for your geographical area.
H Verify that you have the CD that contains a backup copy of the installed
software. Store the CD in a safe location where you can easily retrieve the
software for maintenance purposes.
H Verify that you have a boot disk in case you reformat the hard drive or
damage operating system files or drivers.
NOTE. Keep the software packaging available. You will need it to enter the
Windows NT software registration number when you first power on the analyzer.
(See step 3 under Powering On and Off on page 1--18.)
H Verify that you have all the other standard and optional accessories that you
ordered.
RFA300A Measurement Set 8VSB
1- 5
Installation
Operating Requirements
Table 1--3 lists the operating requirements. Refer to Appendix A: Specifications
for a complete specification list.
Table 1- 3: Operating requirem ents
Requirement Specification
Source voltage 90--250 VAC
Steady State input current 6A
Maximum power consumption 540W
Temperature +5 °Cto+45°C(32°Fto113°F), 30 °C/hr max
Humidity 20% to 80% relative humidity, non-condensing.
maximum, 1.9 A typical
RMS
gradient, non-condensing (derated 1 °C per
1,000 ft. above 5,000 ft. altitude)
Max wet bulb temperature: +31 °C (derates
relative humidity to ~50% @ 50 °C).
,47--63Hz
RMS
Hardware Installation
Altitude To 10,000 ft. (3,040 m), (derated 1 °C per
1,000 ft. above 5,000 ft. altitude).
Before you can operate the product, you must connect the provided power cord.
Refer to Figure 1--10 and connect the power cord to the instrument. Refer to
Table 1--3 for the supply voltage rating and connect the other end of the power
cord to the proper source. Do not connect to any power sources other than those
for which the instrument is rated.
This section deals with hardware installation. To reinstall software, refer to
Appendix C: System Recovery.
The factory installed cabinet is designed to operate in an equipment rack (see
Rackmount Installation on page 1--7). The optional portable cabinet allows you
to operate the instrument on a bench or cart (see Portable Installation on
page 1--12). For proper cooling, at least two inches (5.1 cm) of clearance is
recommended on the rear and sides of the instrument cabinet.
The measurement set is limited to installations where a single, high-amplitude,
8VSB RF signal is available for direct input to the measurement set. Refer to RF
Connections on page 1--14.
1- 6
RFA300A Measurement Set 8VSB
Installation
Rackmount Installation
If your instrument has the rackmount cabinet, there is rackmounting hardware on
each side of the cabinet.
CAUTION. For proper cooling in an equipment rack installation, the air
temperature at all air intake vents (inside of the rack) must not exceed 50
Mounting the Stationary Tracks in the Equipment Rack. The slider kit consists of
left and right stationary tracks that must be installed in the equipment rack. Extra
hardware is provided with the slider assemblies. Since the hardware is intended
to make the sliders compatible with a variety of racks and installation methods,
not all of the hardware will be used for any installation procedure.
1. Attach the extension bracket to the rear of the stationary track.
a. Measure the distance between the front and rear rails of the equipment
rack using method A or method B. Refer to Figure 1--3.
H Method A. If the extension bracket is to be mounted against the front
edge of the rear rail in the equipment rack, measure from the front
edge of the rear rail to the front edge of the front rail.
H Method B. If the extension bracket is to be mounted against the
inside surface of the rear rail in the equipment rack, measure from
the front corner of the rear rail to the front edge of the front rail.
°C.
b. Attach the extension bracket to the rear of the stationary track so that the
length of the combined assembly is approximately that of the measurement taken in step a. above. Use the screws and bar nuts provided with
the chassis tracks. Leave the screws loose.
2. Select the appropriate mounting holes in the front rails of the equipment
rack, observing the clearance measurements shown in Figure 1--4. The front
panel of the rack adapter is designed to fit in an 11-inch high opening.
RFA300A Measurement Set 8VSB
1- 7
Installation
Method A Method B
Rear rail
10-32 PNH screw
Extension bracket
Stationary track
Bar
Nut
Use this measurement
Stop latch
hole
Automatic latchAutomatic latch
NOTE: Right-hand and left-hand stationary sections are designated by the
RH and the LH marked on the rails. Stop latch holes should be towards
the bottom when slides are in place. (The right hand rail is shown above.)
Figure 1- 3: Attaching the extension brackets to the stationary tracks
Rear rail
Extension bracket
Stationary track
Use this measurement
1- 8
0.500 in.
1.75 in.
Adjacent equipment
Figure 1- 4: Mounting hole selection on the front rails of the equipment rack
REV SEP 1994
RFA300A Measurement Set 8VSB
3. Mount the stationary sections (with extension brackets attached) to the front
and rear rails of the equipment rack.
a. Install the rear of the stationary section in front of, behind, or beside the
rear rail of the equipment rack. Use the mounting holes in the rear rails
that correspond to the same level as the front rail holes selected.
If the rear-rail mounting holes are tapped, the bar nut is not used to
attach the extensions. If the rear-rail mounting holes are not tapped, use
the bar nut on the inside of the rail, as shown in Figure 1--5A or use
suitable captive nut clips (not supplied). Figure 1--5B shows the
extension bracket mounted to the inside surface of the rear rail.
Method A Method B
Installation
Rear rail
10-32 PNH
screws
Bar nut (use
if rear rail is
not tapped)
Figure 1- 5: Attaching the extension bracket to the rear rail of the equipment rack
Rear rail
RFA300A Measurement Set 8VSB
1- 9
Installation
b. Mount the stationary sections (with the bracket extensions) to the front
rails. If the front rails are not tapped, use the bar nuts. Refer to
Figure 1--6.
Front rail
Bar nut
(use if front rail
is not tapped)
10-32 PNH
screws
Figure 1- 6: Mounting the stationary section to the front rail of the equipment rack
4. Tighten the screws attaching the extension bracket to the stationary section.
Refer to Figure 1--7.
Tighten these screws
1- 10
Figure 1- 7: Stationary bracket, extension bracket, and attaching screws
RFA300A Measurement Set 8VSB
Installation
Installing the Instrument in the Equipment Rack. Perform the following steps to
install the instrument in the equipment rack:
1. Pull out the intermediate sections of each slide-out track to the fully
extended position. Refer to Figure 1--8.
2. Insert the tracks of the rack adapter into the slide-out intermediate sections.
3. Press both stop latch releases and push the rack adapter toward the rack until
the latches snap into their holes.
4. Again press the stop latches and push the rack adapter fully into the
equipment rack.
Figure 1- 8: Installing the instrument into the equipment rack
RFA300A Measurement Set 8VSB
1- 11
Installation
5. If necessary, adjust the alignment of the stationary sections according to the
following procedure:
a. Loosen the mounting screws at the front of both stationary sections.
b. Allow the tracks to seek their normal positions with the adapter centered
in the rack.
c. Tighten the mounting screws.
Portable Installation
The optional portable cabinet allows you to operate the instrument on a bench or
cart. If you operate the instrument while it rests on the rear feet, make sure that
you properly route any cables coming out of the rear of the instrument to avoid
damaging them. Table 1--2 on page 1--4 lists the part number of the portable
cabinet.
CAUTION. Keep the bottom of the instrument clear of obstructions to ensure
proper cooling.
1- 12
RFA300A Measurement Set 8VSB
Creating a Startup Disk
Installation
An RFA300A Windows NT Start Up disk is shipped with the instrument. Use
this disk to restart your measurement set in case of a major hardware or software
failure. This section creates an extra startup disk in case the original becomes
corrupted.
All software is installed at the factory. If you ever need to reinstall, refer to
Appendix C: Software Installation.
NOTE. You cannot reinstall software without a startup disk.
To create a startup disk, do the following:
1. Open My Computer/Control Panel, and double-click on Add/Remove
Programs.
2. Select the Startup Disk tab.
3. Click the Create Disk button and follow instructions.
4. Copy the following files to the startup disk:
H C:REALMODE\MSCDEX.EXE
H C:REALMODE\TEAC_CDI.SYS
H C:WINDOWS\COMMAND\XCOPY.EXE
H C:WINDOWS\COMMAND\XCOPY32.EXE
5. Create a file named AUTOEXEC.BAT in the startup disk. Add the line
MSCDEX.EXE /D:TEAC--CDI/L:D to the file.
6. Open the CONFIG.SYS file in the startup disk and add
DEVICE=TEAC_CDLSYS /D:TEAC--CDI to the end file.
RFA300A Measurement Set 8VSB
1- 13
Installation
RF Connections
The quality of the input signal path is critical in obtaining the full-specified
performance of the measurement set. Therefore, you must connect the measurement set to your transmitter using high quality cable and connectors. The
following list provides the requirements needed for the RF connection:
H Hold the nonflatness of the input signal to approximately 0.05 dB peak-to-
peak or less over the width of the channel.
H Keep the station’s radiated signal to at least 63 dB down from the sampled
signal in the line by using appropriate shielding.
H The cable with connectors must have a return loss of at least 26 dB
(VSWR ± 1.10) over the channel width and a loss tilt of less than .02 dB
over the channel width. This assumes that the tap used to obtain the signal
has a return loss of ² 30 dB (VSWR ± 1.065).
High quality cable and connectors are required to meet the listed requirements.
The connectors should be precision grade at both ends of the cable. The best
cable type is dependent on the run length and operating frequency. The return
loss requirement is hardest to meet at high frequencies, and the loss tilt is hardest
to meet at low frequencies. In either case, minimize the difficulties by using only
a few feet for cable length. Longer lengths (50 ft. or more) place extreme
requirements on cable quality specifications.
The rear panel provides two RF input connectors for your transmitted signal.
Refer to Figures 1--9 and 1--10 to connect the measurement set to your transmitter and for other connections.
Transmitter Channel filter
Power input
RFA300A
Figure 1- 9: Transmitter connection
Connect the measurement set to your transmitter in a manner that ensures the
instrument will receive only one channel. If the input signal strength is more
than 1 watt, install the external 10 dB attenuator (the input signal strength cannot
be more than 2 watts).
1- 14
RFA300A Measurement Set 8VSB
Installation
NOTE. Power to the measurement set must be within the following ranges:
> 1 mW and < 1 W without the external 10 dB attenuator.
> 10 mW and less ≤ 2 W with the external 10 dB attenuator installed.
Power Alarm
SVGA
Ethernet
port
Parallel
port
Keyboard
Mouse
Figure 1- 10: Rear view
RFA300A Measurement Set 8VSB
RS-232
COM port 1
RF
connections
1- 15
Installation
Interface Connections
The interface connectors on the rear and side of the RF measurement set, shown
in Figure 1--10 and Figure 1--11, provide the interconnection ports for peripheral
devices and networking. Pin assignments for the rear panel and side panel
connectors are listed in Table A--4 and Table A--5 in Appendix A:Specifications.
Keyboard and Mouse Connections
Connect the keyboard and mouse to the left side of the instrument as shown in
Figure 1--11.
Earphones
(Not used)
USB
Keyboard
Mouse
Figure 1- 11: Keyboard and mouse connections
1- 16
RFA300A Measurement Set 8VSB
Loading...