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4-41

Press the

TILT

soft key to turn tilt compensation on or off. Tilt

channels must be programmed in the Channel Plan Edit mode,
before this function can be implemented. The tilt is based on the
levels of the highest and lowest channels configured for tilt.

When turned on, the compensation value can be adjusted using the

UP

and

DOWN

arrow keys or by entering a numeric value followed

by the

ENTER

key. When tilt compensation is in effect, a "TILT

ON" indicator appears in the upper left portion of the scan screen.

Tilt Compensation

The tilt compensation feature allows the user to enter the cable loss
for a particular section of line and then using the scan display adjust
the gain of the amplifier to compensate for this loss.

Scan Rate

Two scan rates are available in the Scan mode, normal and fast. The
scan rate is selected in the Measurement Setup menu. The Fast scan
feature allows for rapid scan displays, while sacrificing accuracy (as
much as 2 dB on scrambled channels). Normal scan rate is slower, but
much more accurate. An indicator appears in the upper left hand
corner of the Scan screen when the Fast Scan mode is selected.

Audio Carriers

If desired, the audio carriers can be omitted resulting in a faster scan.
This feature is selected in the Measurement Setup menu. An
indicator appears in the upper left hand corner of the Scan screen
when audio carriers are omitted.

Limits

The Limits feature allows for comparison of the current scan mea-
surement with the "FCC" limits that are defined in Setup. There are
two parts to this feature.

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Содержание 3HRV

Страница 1: ... E Mail catvsupport wavetek com Internet http www wavetek com 11 96 Rev A Manual Part No 6510 00 0300 This document contains information proprietary to Wavetek The information in this document is not to be used or duplicated in any manner without the prior approval in writing of Wavetek OPERATION MANUAL MODEL 3HRV HEADEND REVERSE SWEEP RECEIVER ...

Страница 2: ...aused by improper storage improperinstallation unauthorizedmodification misuse neglect inadequatemaintenance accidentorforanyProductwhichhasbeenrepairedoralteredbyanyoneotherthanWavetek or its authorized representative or not in accordance with instructions furnished by Wavetek The Warranty described above is Buyer s sole and exclusive remedy and no other warranty whether written or oral expressed...

Страница 3: ... Spectrum Mode 1 4 1 2 8 Intermodulation Distortion 1 5 1 2 9 Depth of Modulation 1 5 1 2 10 Serial Interface 1 5 1 2 11 General 1 5 1 2 12 Powering 1 6 1 2 13 Standard Accessories 1 6 1 2 14 Options 1 6 1 2 15 Optional Accessories 1 6 SECTION 2 INSTALLATION 2 1 INTRODUCTION 2 1 2 2 UNPACKING AND INSPECTION 2 1 2 3 INSTALLATION 2 1 2 4 WARRANTY INFORMATION 2 2 2 5 POWER REQUIREMENTS 2 3 2 6 CABLE ...

Страница 4: ...tek Stealth Reverse Sweep Concept 4 1 4 1 2 Basic Reverse Sweep Procedure 4 1 4 1 3 Interfacing With Different Network Architectures 4 2 4 2 HOW TO SETUP YOUR 3HRV 4 5 4 2 1 How to Setup for Reverse Sweeping 4 5 4 2 2 How to Setup for Measurement Modes 4 12 4 3 SETUP 4 13 4 3 1 General Setup 4 14 4 3 2 Measurement Setup 4 18 4 3 3 How To Setup Your Channel Plan 4 19 4 3 4 How To Edit Channel Param...

Страница 5: ...WEEP MODE 4 52 4 12 FILE 4 54 4 12 1 How to Store View Delete Measurement Files 4 54 4 13 AUTO 4 55 4 13 1 How to Create Edit Delete Test Locations 4 55 4 13 2 How to Perform an Auto Test 4 59 4 13 3 Viewing Printing Auto Test Files 4 67 4 14 STATUS 4 73 APPENDIX A STATUS INDICATORS A 1 APPENDIX B USER MESSAGES B 1 ...

Страница 6: ...smatch problems which reveal themselves as standing waves or diplex filter roll offs that can severely hamper the carriage of services in the reverse band Ingress Detection and Troubleshooting The 3HRV provides feedback to the field as to the current condition of noise and ingress in the headend Even if the noise or ingress is swamping the telemetry a picture of the headend noise ingress is sent o...

Страница 7: ...pproxi mately fifteen pounds Its 320 X 240 dot matrix LCD shows measure ment data in both graphical and numerical form The contents of this manual will describe the care and operation of the Headend Reverse Sweep Receiver including Reverse Sweep operation 1 2 SPECIFICATIONS 1 2 1 Frequency Range 5 to 1 000 MHz Accuracy 10 ppm at 25 C 10 ppm drift over temp 3 ppm year aging Resolution Bandwidths 30...

Страница 8: ...ed channels only No preselection required for 78 channels at 10 dBmV input level Carrier to Noise Ratio Depth of Measurement Characteristics Video Carrier Level dBmV Carrier to Noise Range 0 10 20 30 40 50 60 10 0 10 14 24 Specified results with the measurement offset within 2 to 3 MHz range above the video carrier Resolution 0 5 dB Range 52 dB maximum 3 0 dB Accuracy 2 0 dB Accuracy Out of Measur...

Страница 9: ...y Range 5 to 1 000 MHz Level Range 20 to 50 dBmV settable in 2 dB increments Spectral Purity Hars 30 dBc Spurs 35 dBc 1 2 7 Spectrum Mode Spans 3 5 10 20 and 50 MHz 0 3 0 5 1 2 and 5 MHz div Sweep Rates 2 seconds 50 5 MHz Display Scaling and Range 0 5 1 2 5 and 10 dB division 6 vertical divisions Spurious Free Dynamic Range 60 dB typical specifications ...

Страница 10: ... Typical Specifications Range 60 dB maximum Resolution 1 dB 1 2 9 Depth of Modulation Assumes presence of white reference on any VITS line Non scrambled channels only Range 80 to 100 Resolution 0 5 at 85 1 2 10 Serial Interface Serial RS232 Epson IBM Printers 1 2 11 General Log Linearity 0 5 dB typical Flatness 0 5 dB 25 C 20 dBmV Out of Measurement Range 3 0 dB Accuracy 2 5 dB Accuracy ...

Страница 11: ...annel Plan Transfer Cable Operations Manual 1 2 14 Options 16 64 QAM Digital Carrier Power Measurement Enables Stealth to perform accurate level measurements on digital carriers 1 2 15 Optional Accessories 1010 00 0342 Citizen PN60 thermal fusion Printer 1019 00 0457 Optional Battery for PN60 Printer 3010 59 0009 Citizen PN60 Printer Ribbons 2 included with printer 1217 50 0159 Citizen PN60 Printe...

Страница 12: ... Testing 55 to 440 MHz PP 55 110 Tunable Precision Preselector 55 to 110 MHz PP 110 220 Tunable Precision Preselector 110 to 220 MHz PP 220 440 Tunable Precision Preselector 220 to 440 MHz PP 440 880 Tunable Precision Preselector 440 to 880 MHz 7201 Tunable Precision Preselector 31 to 62 MHz 7202 Tunable Precision Preselector 62 to 125 MHz 7203 Tunable Precision Preselector 125 to 250 MHz 7204 Tun...

Страница 13: ...STOMER SERVICE call WAVETEK 800 851 1198 International Customers contact your local Wavetek Representative 2 3 INSTALLATION Proper installation of the 3HRV is essential to correct operation of the system The 3HRV is typically installed in a headend rack There are two different recommendations for setting up the system One entails receiving the reverse sweep signal at a standard reverse node com bi...

Страница 14: ... method would be to insert the 3ST Transmitter output at one of the combining network inputs and connect the transmit ter reference input to the headend amplifier input test point This method eliminates the need to add directional couplers at the combiner output Note A diplex filter must be used to couple the foward path to the input of the 3HRV for all measurement mode operations other than rever...

Страница 15: ... associated with the operation of the 3HRV Stealth to Stealth and a Serial Printer cable The following informa tion describes each of the associated cables Stealth to Stealth The Stealth to Stealth cable 1217 50 0149 provided with each 3HRV is used for communications between Stealth units Rx Tx DTR GND DSR RTS CTS RI Tx Rx DTR GND DSR CTS RTS RI ...

Страница 16: ...2 4 Serial Printer Cable The Serial Printer Cable 1217 50 0151 can be used to print data directly from the 3HRV Tx Rx GND DTR Rx Tx DTR GND DSR CTS ...

Страница 17: ...vetek immediately Save the shipping carton and packing material in the event that you have to return it FOR CUSTOMER SERVICE call WAVETEK 800 851 1198 International Customers contact your local Wavetek Representative The above numbers can also be accessed on your unit by pressing the FCN key followed by the help key 2 8 Worldwide Sales Offices Austria Vienna Hong Kong Tel 43 1 214 5110 Tel 852 278...

Страница 18: ...e keypad includes eight Soft keys eight Measurement Mode selection keys four Support Mode selection keys four Arrow keys sixteen Numeric Entry keys 3 2 1 Soft Keys There are a total of eight vertically oriented soft keys four on either side of the display The function of each soft key changes depending on the particular operation being performed The function is indi cated on the display next to th...

Страница 19: ... below the display LEVEL Signal level measurements on individual channels are made by entering a specific channel number and pressing the channel key Measurements can also be made by selecting the carrier with a marker in the Scan mode and pressing the Level key TILT The Tilt mode simplifies the balancing of pilot levels by displaying a bar graph with a representation of up to nine different user ...

Страница 20: ...ss of telemetry to any Receivers connected to the system C N Measures the C N carrier to noise ratio of the tuned channel or frequency will be displayed HUM Measures the hum modulation of the tuned channel will display in either or dB as selected by the operator MOD Allows the user to listen to the modulation of the tuned channel of frequency and measure Depth of Modulation of a video carrier SPEC...

Страница 21: ...ons are used to set or adjust the operating parameters of the unit Print Allows the user to print the current measurement screen 3 2 4 Arrow Keys The four Arrow keys are used for various purposes There functions are described in the individual sections for each operating mode These keys are located to the right of the Support Mode Selection keys ...

Страница 22: ...Mode Most numeric keys have alphabetic characters printed on them These characters can be accessed when the alpha entry indicator appears in the title bar In the alpha entry mode a cursor appears below the active position Repeated pressing of an alphanumeric key sequences through the values printed on the key Once the desired character is selected the cursor is moved to the next position using the...

Страница 23: ...ted and decremented using the UP and DOWN arrow keys Numeric entry must be terminated by pressing the ENTER key Multiple Choice Mode This mode allows you to sequence through a series of choices which appear in the edit box 3 2 6 Printing Any measurement mode screen can be printed directly Press the Print key to print the current measurement screen To print a measurement file simply view the file a...

Страница 24: ...with the tagged serial number then displays the sweep response as measured in the headend on its LCD Up to 10 receivers at a time can perform reverse sweep ing If additional receivers attempt to sweep a message is displayed 4 1 2 Basic Reverse Sweep Procedure Sweeping the reverse path is a little different from sweeping the forward path Because the system is designed with appropriate spacing for t...

Страница 25: ...emetry signal from the 3HRV Figure 1 Single Cable Split Band Network Reverse Sweep Configuration With Bi Directional Test Points In the field systems with bidirectional test points forward and reverse signals both present on the same test point a summing network provided with each reverse sweep option is used to enable reception of forward telemetry and sweep as well as inject reverse telemetry an...

Страница 26: ...odes In these architectures the installation of the 3HRV in the headend is as shown in figure 3 The connection at the node may be as shown in figure 4 Notice that in this configuration the forward and reverse test points are separated and two directional couplers must be used In all of these connection scenarios either a summing network or two directional couplers are used to interface with the sy...

Страница 27: ...le Network Another possible though rare network configuration is the Dual Cable Network in which a full bandwidth is used for both forward and reverse essentially two cable systems overlaying each other with signals carried in opposite directions These networks are impossible to sweep simultaneously in both directions with one man ...

Страница 28: ...rse portion 4 2 HOW TO SETUP YOUR 3HRV 4 2 1 HOW TO SETUP FOR REVERSE SWEEPING To setup the Reverse Sweep on the 3HRV press the SETUP key and select the Reverse option from the Setup menu The Reverse Sweep setup screen will appear Important To prevent the 3HRV reverse sweep from contending with the 3ST disable the 3ST s reverse sweep This will speed up the 3ST s forward sweep Multi user contention...

Страница 29: ...ransmit telemetry data Use the edit box to set the Telemetry Level to an appropriate value When adjusting the Telemetry Level take into consideration the following losses system summing network test point and amplifier desired input Use the UP and DOWN arrow keys or the numeric keypad to enter the telemetry level 20 50 dBmV Reverse Telemetry Frequency This is the frequency at which 3SRV units with...

Страница 30: ...layed beneath the list of plans Use the up or down arrow to select the plan you want then press the Load soft key to load the selected plan into memory for use Press the Exit soft key to return to the previous screen or the SWEEP key to begin sweeping Creating a New Reverse Sweep Plan Press the New soft key to create a new Reverse Sweep Plan You will be asked to enter a name for the plan that you ...

Страница 31: ...4 8 Next enter the Start Frequency This will be the frequency of the first sweep point in the plan Use the numeric keys followed by the ENTER key Then press the OK soft key to continue ...

Страница 32: ...ts Use the numeric keys followed by the ENTER key Then press the OK soft key to continue Finally you are asked to enter the Stop Frequency There will be no sweep points generated beyond the Stop Frequency Use the numeric keys followed by the ENTER key Then press the OK soft key to continue ...

Страница 33: ...ll appear in the Reverse Sweep Plan list IMPORTANT You should verify that none of the sweep points contained within the Reverse Sweep Plan will interfere with existing carriers on the reverse plant including other reverse telemetries if the single user is still active See below to view and edit your channel plan Editing a Reverse Sweep Plan If desired the selected Reverse Sweep Plan can be viewed ...

Страница 34: ...the numeric keys followed by the ENTER key The list will be updated when the ENTER key is pressed To remove a sweep point use the up or down arrow to select the point to be removed then press the Delete soft key Press the Add soft key to insert a new sweep point into the plan The new point will be at the same frequency as the point that was selected when the Add soft key was pressed You will need ...

Страница 35: ...rsor down to the appropriate channel plan and press the ENTER key or the OK soft key 5 You will then be prompted to enter the highest frequency that you would like to scan Type in the frequency and press the ENTER key followed by the OK soft key The unit will then commence a scan for the presence of channels After the scan is done this phase of the channel plan building process is complete Press t...

Страница 36: ...special algorithm is used to ensure that the peak of these signals is measured At this time you may also wish to designate tilt channels and label the channels with call letters but this is not essential to begin the measurement process 4 3 SETUP There are four setup modes for the 3HRV General Measurements Channel Plan and Reverse Sweep General setup allows the operator to configure general aspect...

Страница 37: ...Use the Up and Down soft keys to scroll to additional setup items When lists are being displayed the up arrow soft key dims when the first item in the list is reached and the down arrow soft key dims upon reaching the last item ...

Страница 38: ...ec or always on Use the UP and DOWN arrow keys to set the time out period The Backlight can be manually turned on off at any time by pressing the Function key followed by the Light second function key Time Use the numeric entry keys to enter the time in the HH MM SS format 24 hour Date Use the numeric entry keys to enter the date The date will be displayed in the format chosen in the Date Format s...

Страница 39: ...tup is the same as the serial printer configuration Lines Page The number of Lines Page min 30 max 255 can be specified for text printouts This determines the number of lines that are printed before a form feed command is sent If no form feeds are desired enter zero for the Lines Page Baud Rate The Baud rate is used when establishing communications between the 3HRV and another device The Baud rate...

Страница 40: ...etting the unit to factory default settings Display Test Allows the user to test the operation of the display Press the ENTER key to begin the display test Follow the instructions displayed while performing the test Transmitter Diagnostics Press the ENTER key to access the following Transmitter Diagnostic features Transmitter On Off When turned on provides a CW RF signal that can be used as a trou...

Страница 41: ...emperature Unit Use the UP and DOWN arrow keys to select the desired temperature units C F Signal Level Units Use the UP and DOWN arrow keys to select the desired level units dBmV dBµV dBm Test Point Compensation Test Point Compensation is used to account for loses associated with certain amplifiers Use the UP and DOWN arrow keys or the numeric entry keys to enter the Test Point Compensation 100 0...

Страница 42: ...g accuracy Normal scan rate is slower but more accurate Scan Audio Carriers If desired the audio carriers can be omitted resulting in a faster scan This feature is selected using the UP and DOWN arrow keys yes no C N Calibration To increase the accuracy of the C N measurements a noise floor calibration is performed This allows the user to characterize the noise floor of the unit To perform the cal...

Страница 43: ...Channel plans can also be deleted from the list using the Delete soft key An OK and Stop soft key is then displayed to confirm or stop the deletion of the channel plan The currently active channel plan as indicated in the lower right hand corner of the screen cannot be deleted To delete this plan first select a different plan by using the arrow keys to highlight another plan and then press the Loa...

Страница 44: ...d to enter a channel plan name Press the OK soft key when completed Step 2 Select a fixed channel plan to use for building the new plan Use the UP and DOWN arrow keys to select a fixed channel plan to build the new plan from Press the OK soft key when completed Step 3 Enter the frequency at which to stop searching for channels Press the ENTER key followed by the OK soft key to set the stop frequen...

Страница 45: ... feature allows the user to edit an existing channel plan Press the ENTER key to initiate channel plan editing A list of all channels contained within the active plan is presented Use the UP or DOWN arrow keys to select the channel that you wish to edit ...

Страница 46: ...ludes standard video carrier with audio carrier offset DUAL European system which incorporates video plus two independent audio carriers Single Carrier Can be used for an FM or data carrier Sweep Insertion Point Used to insert sweep points into vacant spectrum areas Digital Carrier Can be used for 16 64 QAM digital carrier power measurement Only supported in the Level Sweep and Spectrum measuremen...

Страница 47: ...weep speed by 15 msecs per non 250 kHz increment Measurement Bandwidth Adjustments To edit the bandwidth cursor to the Measurement BW selection The bandwidth can be adjusted by using the UP and DOWN arrow keys or by entering a value using the numeric keypad and then pressing the ENTER key The FCC specification for C N measure ments is a bandwidth of 4 200 MHz CATV organizations outside of the Unit...

Страница 48: ...or the second audio carrier of a Dual type channel An ADD and DELETE soft key allows for adding new channels to the plan or deleting existing channels from the plan Press the Exit soft key to return to the Edit Channel Parameters display Delete Unused Channels Once the channel plan has been built unused channels can be deleted if desired Doing this frees memory for other uses and unclutters the ch...

Страница 49: ...m and Modulation cannot be measured on a scrambled channel or a sweep point Hum and Modulation cannot be measured on a Digital type carrier Use the All None soft key to quickly select or deselect Auto Test measurements If a test is selected the None soft key is displayed If no tests are selected for a particular channel then the All soft key is displayed ...

Страница 50: ... Remote Plan This selection allows you to copy a channel plan from one unit to another Connect a cable between the serial ports of two units Ensure that the baud rate is set the same for each unit General Setup screen A baud rate of 19 2K is recommended for uploading plans Select Copy Remote Plan from the menu and press the ENTER key A list of plans located in the remote units memory will appear S...

Страница 51: ...4 28 4 3 5 Reverse Sweep ...

Страница 52: ...ion Forward Telemetry Level This is the level of the carrier that the 3HRV uses to transmit telemetry data Use the edit box to set the Telemetry Level to an appropriate value When adjusting the Telemetry Level take into consideration the following losses system summing network test point and amplifier desired input Use the UP and DOWN arrow keys or the numeric keypad to enter the telemetry level 2...

Страница 53: ...option To access Reverse Sweep Plans select the Reverse Sweep Plans option and then press the ENTER key Selecting a Reverse Sweep Plan The Reverse Sweep Plan screen presents a list of all Reverse Sweep Plans stored in memory The current active Reverse Sweep Plan is displayed beneath the list of plans Use the up or down arrow to select the plan you want then press the Load soft key to load the sele...

Страница 54: ...umeric keys followed by the ENTER key Then press the OK soft key to continue NOTE A warning message will appear if a Reverse Sweep Plan currently exists with the same name as the plan you are creating Next enter the Start Frequency This will be the frequency of the first sweep point in the plan Use the numeric keys followed by the ENTER key Then press the OK soft key to continue ...

Страница 55: ...ts Use the numeric keys followed by the ENTER key Then press the OK soft key to continue Finally you are asked to enter the Stop Frequency There will be no sweep points generated beyond the Stop Frequency Use the numeric keys followed by the ENTER key Then press the OK soft key to continue ...

Страница 56: ...rt Frequency and continuing until the Stop Frequency is reached The frequency of each point is calculated by adding the Step Interval to the frequency of the previous point After it has been created the new plan will appear in the Reverse Sweep Plan list ...

Страница 57: ... sweep points contained within the se lected Reverse Sweep Plan The list consists of the sweep point number followed by the frequency of the sweep point Use the up and down arrows to scroll through the list Note that the frequency of the selected sweep point also appears in the edit box below the list You can change the frequency by using the numeric keys followed by the ENTER key The list will be...

Страница 58: ...ting the Reverse Sweep Plan press the EXIT soft key to return to the previous screen 4 4 HOW TO PERFORM LEVEL MEASUREMENTS Signal levels are measured in the Level and Scan Modes The Level display provides both a numeric indication of signal level and an analog meter The audio and video carrier levels of a channel are displayed simultaneously Alternately an individual carrier can be measured as in ...

Страница 59: ...n the system Tuning by Channel or Frequency When the level mode is selected the unit can be tuned by channel or frequency When in the channel mode the channel and channel label will appear at the top of the display The left and right arrow keys can be used to decrement and increment the channels Channels can also be entered using the numeric keys followed by the CHAN key To tune by frequency use t...

Страница 60: ... spectrum that are used for Automatic Gain Control AGC or Automatic Slope Control ASC In the amplifier balancing process these signals are measured and adjusted to specification Before making an adjust ment ensure that there are no problems in the system that should not be compensated with an adjustment but repaired instead To balance the amplifier ensure that the AGC and ASC is switched off Tilt ...

Страница 61: ...LT key is pressed the screen will automatically display up to nine video carrier levels that were defined in the Edit Channel Parameters portion of the Channel Plan Setup menu The UP and DOWN arrow keys can be used to adjust the reference level of the graph Level Adjustments Press the LVL soft key to edit the scale and reference level of the Tilt display To adjust the Scale use the UP and DOWN arr...

Страница 62: ...cally set the reference level for an optimum Tilt display The FCN Scale key can also be used to automatically set the reference level 4 6 SCAN MODE Use the Scan mode to get a good look at the whole spectrum of absolute carrier levels In this mode a bar graph showing all carrier levels is displayed A marker selects which carrier level is displayed on the bottom of the screen Information displayed i...

Страница 63: ... a scale that will provide the best viewing of the carrier levels To adjust the Ref Level press the Ref Level soft key Now the Ref Level can be changed by using the UP and DOWN arrow keys or by entering a numeric value followed by the ENTER key The reference level is the top line of the graph NOTE The reference value is limited by unit and the scale setting Pressing the Auto Scale soft key will au...

Страница 64: ...ust the gain of the amplifier to compensate for this loss Scan Rate Two scan rates are available in the Scan mode normal and fast The scan rate is selected in the Measurement Setup menu The Fast scan feature allows for rapid scan displays while sacrificing accuracy as much as 2 dB on scrambled channels Normal scan rate is slower but much more accurate An indicator appears in the upper left hand co...

Страница 65: ...ith each scan update An aggregate result summary can be accessed by pressing the LIM soft key This performs a limit check of all channels contained within the scan and reports an overall pass fail conclusion The aggregate limit check is not performed with each scan update however a Check soft key is provided to repeat the limit check whenever desired The Limits On Off soft key toggles the limit ch...

Страница 66: ...mode the carrier to noise ratio of the tuned channel or frequency is displayed The C N measurement bandwidth and the frequency offset for the noise measurement may be controlled from the screen A proprietary DSP technique allows C N measurements on modulated carriers non scrambled channels The measurement is made by measuring the video carrier level and then tuning to the offset frequency Once a l...

Страница 67: ...f 4 200 MHz CATV organizations outside of the United States may have different requirements Noise Offset Frequency Adjustments The frequency at which the noise level is measured is the Carrier frequency plus the noise offset To adjust the noise offset press the OFFSET soft key The offset can be adjusted by using the UP and DOWN arrow keys or by entering a value using the numeric keypad and then pr...

Страница 68: ...oubleshooting A 60 Hz modulation component suggests a possible corroded connec tor a 120 Hz component tends to indicate a possible failure related to the DC supply in the amplifier possibly a capacitor going bad and aggravating the ripple A proprietary DSP technique enables Hum measurements on modulated carriers non scrambled channels Stealth has been given the capability of measuring the 1Hz Hum ...

Страница 69: ...n in graphical and precise numerical format A marker is placed at the optimal modulation level NTSC 87 5 PAL 90 to assist techni cians while making adjustments An Audio and Depth soft key is used to select the type of modulation to be displayed An additional feature is the ability to listen to the audio modulation of the tuned channel or frequency Use the Audio soft key to listen to the audio modu...

Страница 70: ...ZER MODE The spectrum analyzer display provides a view of the system spectrum with variable spans from 50 MHz to 3 MHz and a dynamic range of better than 60 dB When the Spectrum key is pressed the following screen is displayed ...

Страница 71: ...be adjusted using the cursor keys or by entering a numeric value followed by the enter key The scale parameter 1 2 5 10 dB Div can only be adjusted with the cursor keys For example if the reference level was set at 0 dB and the scale was set at 10 dB div the first horizontal grid line above the center would be equal to 30 dB Press the LVL soft key to return to the main spectrum analyzer display Fr...

Страница 72: ...of the display and reads the delta indicated at the bottom of the screen The FCC requirement is a window of 2 0 dB which means the delta should be 4 dB How To Make CSO CTB Measurements CSO Composite Second Order is a clustering of second order beats at any frequency in the spectrum which causes interference to picture quality when they fall within the video bandwidth CTB Composite Triple Beat is a...

Страница 73: ...4 50 Press the OK soft key once the carrier has been turned off The CSO CTB measurement is now displayed ...

Страница 74: ...of the second and third order beats The worst case CSO value is highlighted and is the overall CSO value Press the CSO Setup soft key to adjust the offset values for the CSO measurement Using the Up and Down arrow soft keys select the CSO Offset number to change Use the numeric entry keys or the UP and DOWN arrow keys to enter a new CSO Offset value When exiting out of the CSO CTB measurement the ...

Страница 75: ...ry for display The number of active users accessing return sweep information is indicated by the number of icons displayed below the level information The 3HRV can handle up to 10 differ ent technicians on the same cluster of nodes NOTE Sweep telemetry will cease when another mode is selected 3SRV operator information can be accessed by pressing the INFO soft key The information screen displays th...

Страница 76: ...requency soft key is Marker Zoom This will change the start and stop frequency to coincide with the marker value The soft key will change to Undo to return to original start and stop values Press the FRQ soft key to return to main sweep display Level Adjustments A LVL level soft key is used to adjust the vertical parameters of the graph These parameters include Ref Level and Scale The reference le...

Страница 77: ...eep display Press the LVL soft key to return to main sweep display 4 12 FILE The File menu consists of two File submenus Store File and Measurement Files 4 12 1 How to Store View Delete Measurement Files The Store File feature allows the user to store sweep spectrum and scan measurements To store a measurement press the File key while taking the measurement Press the Store Measurement soft key to ...

Страница 78: ...can measurements can be stored but can only be viewed printed using the Stealthware Data Analysis software Once a file is selected it can be printed using the Print soft key All measurement files with the exception of scan files can be printed using the Print All soft key Use the Delete soft key to delete all unwanted files 4 13 AUTO The Auto menu consists of three File submenus Test Locations Per...

Страница 79: ... Test report The Test Locations can be created directly on the Stealth unit or using the SteathWare Data Analysis software and downloaded to the Stealth unit The Test Location is used to identify where the data is collected The user then simply selects the corresponding location and the location data is automatically included in the Auto Test report ...

Страница 80: ...4 57 Press the New soft key to create a new Test Location file The unit will then prompt for a file name Once a name is entered press the OK soft key to execute the operation ...

Страница 81: ...aker Config 1 9 1 5 Trunk Termination NO YES NO 6 Voltage Setting LOW MID HIGH 7 Rev Pad 100 0 100 0 0 0 dB 8 Rev Equalizer 100 0 100 0 0 0 dB 9 Fwd Pad 100 0 100 0 0 0 dB 10 Fwd Equalizer 100 0 100 0 0 0 dB There are five types of locations associated with a cable system Trunk Amp Headend Line Extender Fiber Node and Field Test Some of the parameters do not apply to certain types of locations The...

Страница 82: ...eters have been edited press the OK soft key The Delete soft key is used to delete a specific location file 4 13 2 How To Perform An Auto Test The Auto Test mode provides automated FCC 24 hour testing capabilities Video audio carrier levels will be measured for each enabled channel Additionally the following can be selectively measured for each channel C N Hum and Modulation See Section 4 3 3 How ...

Страница 83: ...g the Up and Down arrow keys select an Auto Test location Select NONE if location information is not desired Press the OK soft key when completed To create a new Auto Test location press the New soft key Auto Test Characteristics ...

Страница 84: ...are made and the Save soft key is not pressed the changes will only affect the Auto Test that is about to be per formed Press the OK soft key when completed Test Point Type Use the Up and Down arrow keys to select the Test Point type When the desired Test Point type is selected press the OK soft key The following is a list of Test Point types available Trunk Amp Forward Trunk In Forward Trunk Out ...

Страница 85: ...se the numeric entry keys to enter the following system voltage measurements AC Voltage DC Voltage regulated DC Voltage unregulated The voltage measurements are printed in the Auto Test report Press the OK soft key when completed ...

Страница 86: ... is used to account for loses associated with certain amplifiers Use the UP and DOWN arrow keys or the numeric entry keys to enter the Test Point Compensation 100 0 to 100 0 dB in 0 1 dB steps Press the OK soft key when the desired value has been entered ...

Страница 87: ...o commence the Auto Test Press the Scheduled soft key to perform the Auto Test repeatedly at scheduled intervals Immediate If the Immediate mode is selected the unit will commence the Auto Test sequence Prior to starting the test the unit will prompt you to enter the ambient temperature The temperature displayed is the temperature sensed by the unit Use the numeric entry keys to enter the ambient ...

Страница 88: ...ing performed i e Level C N Hum or Modulation is indicated on the screen A bar graph showing the percentage of completion is dis played Scheduled If the Scheduled mode is selected the start stop and interval information must be entered prior to commencing the Auto Test ...

Страница 89: ...l prompt you to enter the ambient temperature The temperature displayed is the temperature sensed by the unit Use the numeric entry keys to enter the ambient temperature Press the OK soft key when the desired temperature has been entered If the first interval is to commence immediately the Auto Test In Progress screen is displayed When the unit is between testing intervals the following screen is ...

Страница 90: ...t key is available to print all intervals from all files in the directory to the printer The Info soft key displays the Test Location Characteristics for the selected file A table with all testing intervals and test site information is now displayed If the Auto Test was performed immediately then only one interval is displayed If the Auto Test was performed using scheduled intervals then all the i...

Страница 91: ...ilure of the measurements taken during that interval A check mark indicates that all measurements were within the specified limits To comply with FCC 24 hour testing requirements the 24hr Report soft key is provided When the 24hr Report soft key is pressed the unit will automatically format and print the highlighted interval plus the next three intervals The following is an example of a 24 Hour Te...

Страница 92: ... 00 05 00 00 11 00 00 Temp 75 F 61 F 59 F 83 F Video Video Video Video 24 Hr Chan Level Level Level Level Deviation dBmV dBmV dBmV dBmV dB 2 9 6 8 8 17 7 LO 10 7 28 4 HI 3 9 9 8 6 5 8 LO 8 9 15 7 HI 4 9 2 8 3 2 9 LO 10 1 13 0 HI 5 9 3 8 2 9 3 11 5 3 3 6 8 1 9 1 8 6 11 0 2 9 14 9 7 8 7 9 0 11 0 2 3 15 9 3 7 6 9 6 10 6 3 0 16 10 2 8 0 10 7 10 5 2 7 17 9 6 7 4 9 4 10 8 3 4 18 9 2 8 0 10 0 10 2 2 2 LI...

Страница 93: ...l can be selected and viewed as desired Use the Up and Down arrow soft keys followed by the View soft key to view specific interval test results The test results along with the limits comparison is displayed The asterisks and up down arrows have the same meaning as on the single interval report printout The limit that was exceeded along with the measurement reading is displayed on the lower portio...

Страница 94: ...Hum and Modulation measurements the following symbols will replace the measurement value if an error occurred UNDER under range OVER over range ERROR synthesizer unlocked The Print soft key can be used to print out the following report ...

Страница 95: ...3 3 TNN 5 8 LO 13 9 8 1 4 USA 2 9 LO 15 6 12 7 0 9 5 ESPN 0 1 16 1 16 2 48 2 6 MTV 7 9 20 3 28 2 HI 88 2 7 FMLY 9 9 10 6 20 5 HI 8 CMDY 6 9 11 5 18 4 HI 12 7 9 LIFE 9 1 11 1 20 2 HI 10 VH1 8 5 13 3 21 8 HI 57 9 11 CNN 4 1 12 0 16 1 12 A E 4 3 3 4 7 7 87 5 13 CINE 7 1 4 2 11 3 2 1 14 SHOW 6 3 7 5 3 8 15 NICK 10 2 HI 8 2 18 4 HI 55 1 86 9 LIMIT CHECK Limit Actual Min Video Carrier Level 0 0 dBmV CH ...

Страница 96: ...by the Status second function key The Status screen provides unit information to the user An important feature is the amount of memory currently being used This allows the user to decide if unwanted files should to be deleted to make more memory available for newer files ...

Страница 97: ...the Stealth 3HRV The following is a list of all status indicators icons and an explanation of each The status indicators are displayed in the title bar as shown in the example below Video Carrier Audio Carrier Single Carrier DUAL Carrier Band Pass Filter Hum screen Low Pass Filter Hum screen Noise C N screen ...

Страница 98: ...try frequencies are matched Message SORRY The selected reference cannot be used Condition The channel plan has been changed or a different channel plan has been selected since storing the reference Response Delete the incompatible reference and select another or store a new reference Message ERROR The synthesizer has become unlocked Condition The PLL synthesizer has become unlocked Response Indica...

Страница 99: ...ady exists Overwrite Condition A reference with the same name currently exists Response Overwrite the existing reference or choose another name Message SORRY This is an invalid name Please try again Condition An invalid name has been entered Response The name must contain at least one character Message SORRY There is not enough memory to store a new reference Condition Memory is currently at maxim...

Страница 100: ... error has occurred Condition A system error has been detected Response Restart the unit and try again Message ERROR There is no response from the printer Condition The printer is not responding to the unit Response Check printer connection and compatibility Message SORRY There is nothing to print Please select a measurement mode before attempting to print Condition An attempt to print was made wi...

Страница 101: ...failure Response Delete the corrupted file and select another sweep file Message ERROR A system error has occurred Please select another mode Condition A system error has been detected Response Select another measurement mode or restart the unit and try again Message ERROR At least two tilt channels must be programmed and enabled Please select another mode Condition Tilt mode is selected with less...

Страница 102: ...th the same name currently exists Response Overwrite or choose another name Message SORRY This is the name of a fixed plan and cannot be used Condition An attempt was made to name a channel plan with the name of a fixed plan Response Choose another name Message ERROR The stop frequency has been set too low Condition The stop frequency has been set below the lowest channel in the selected fixed pla...

Страница 103: ...ncel Message SORRY There is not enough memory to store the new plan Condition Memory is currently at maximum capacity Response Delete unwanted files to make more memory available Message WARNING There is not enough memory to save the changes Condition Memory is currently at maximum capacity Response Delete unwanted files to make more memory available Message SORRY Some channels may not have been c...

Страница 104: ...ambled channel Message ERROR Hum cannot be measured on a scrambled channel Condition A channel that has been programmed as scrambled in setup has been selected in Hum mode Response Select a channel that is not scrambled Hum measurements are not possible on a scrambled channel Message SORRY No more tilt channels can be programmed Condition The maximum number of tilt channels has been reached Respon...

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