OPERATION MANUAL MODEL 3ST SYSTEM SWEEP TRANSMITTER 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. Wavetek CATV Division 5808 Churchman Bypass Indianapolis, IN 46203-6109 (800)851-1198 (317)788-5960 Fax: (317)782-4607 E-Mail: catvsupport@wavetek.com Internet: http://www.wavetek.com 11/96 Rev. I, Manual Part No.
WARRANTY Wavetek warrants that all Products manufactured or procured by Wavetek conform to Wavetek’s published specifications and are free from defects in materials and workmanship for a period of one (1) year from the date of delivery to the original Buyer, when used under normal operating conditions and within the service conditions for which they were designed. This warranty is not transferrable and does not apply to used or demonstration products.
Contents SECTION 1 - GENERAL INFORMATION 1.1 INTRODUCTION ................................................................ 1-1 1.2 SPECIFICATIONS ............................................................. 1.2.1 Frequency .................................................................... 1.2.2 Level Measurement ................................................... 1.2.3 Hum Measurement ..................................................... 1.2.4 Carrier to Noise Measurement ................................
2.8 WORLDWIDE SALES OFFICES .....................................2-5 SECTION 3 - USER INTERFACE 3.1 INTRODUCTION .............................................................. 3-1 3.2 FRONT-PANEL DESCRIPTION ................................... 3-1 3.2.1 Soft Keys ...................................................................... 3-1 3.2.2 Measurement Mode Selection Keys ......................... 3-2 3.2.3 Support Mode Selection Keys ................................... 3-4 3.2.4 Arrow Keys ..............
4.10 SPECTRUM ANALYZER MODE ................................ 4-34 4.11 SWEEP MODE ................................................................. 4-39 4.12 FILE .................................................................................... 4-40 4.12.1 How to Store/View/Delete Measurement Files ... 4-40 4.13 AUTO ................................................................................. 4-42 4.13.1 How to Create/Edit/Delete Test Locations ......... 4-42 4.13.2 How to Perform an Auto Test .....
MODEL 3ST SECTION 1 GENERAL INFORMATION 1.1 INTRODUCTION The Wavetek Sweep System Transmitter performs essential cable TV system preventive maintenance tests with accuracy and ease. Signal levels, hum, C/N, and frequency response can be quickly tested without subscriber interference. The Sweep System is made up of two components; the Sweep System Receiver 3SR, and Sweep System Transmitter 3ST.
The 3ST Transmitter is a full-featured signal analysis meter, with a complete spectrum display and an analog representation of single channel measurement data. When tuned to a specific channel, a comprehensive set of information is provided: tuned channel, video frequency and level, audio frequency and level, the difference between video and audio carrier levels. The 3ST Transmitter is a standard 19" rack mount unit, that weighs approximately fifteen pounds.
Resolution: <0.2% Accuracy: +0.7% 1.2.4 Carrier to Noise Measurement Non-scrambled channels only. No preselection required for 78 channels at +10 dBmV input level. Carrier to Noise Ratio Depth of Measurement Characteristics * 60 Out of Measurement Range Carrier to Noise Range 50 40 30 uracy B Acc +3.0 d uracy B Acc +2.0 d 20 10 0 -10 0 10 14 24 Video Carrier Level (dBmV) *Specified results with the measurement offset within 2 to 3 MHz range above the video carrier.” Resolution: 0.
1.2.6 Transmitter Frequency Range: 5 to 1,000 MHz Level Range: +20 to +50 dBmV (1) ; 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) 1.2.
*Typical Specifications Range: 60 dB maximum Resolution: 1 dB 1.2.9 Depth of Modulation Assumes presence of white reference on any VITS line. Nonscrambled 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 Dimensions: Transmitter 3ST: 48.3 cm (W) x 13.3 cm (H) x 35.6 cm (D), 19" (W) x 5.25" (H) x 14" (D) Weight: Transmitter 3ST: 6.
Fuse 1.25 A, 250V 5X20mm SLO-BLO (2 required) 1.2.13 Standard Accessories Line Cord Channel 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.
(1) Specification Change - The transmitter output is being changed from +10 to +40 dBmV to +20 to +50 dBmV. To determine which transmitter output range is available on your unit, access the Status screen by pressing the FCN key followed by the status second function key. If "Enhanced Output" is displayed in the options box, the transmitter output range is +20 to +50 dBmV.
SECTION 2 INSTALLATION 2.1 INTRODUCTION This section provides information on how to install the 3ST Transmitter. 2.2 UNPACKING AND INSPECTION The instrument was inspected, and given final operational and quality control tests prior to being carefully packaged for shipment. The unit should operate in accordance with the specifications listed in this manual. When unpacking the instrument, inspect the shipping container and instrument for shipping damage.
The transmitter output level is variable from +20 to +50(1) dBmV in 2 dB increments. The output level will be attenuated by the tap value of the directional coupler. For example, if a sweep signal level of +16 dBmV is desired on the system and the output of the 3ST Transmitter is set to +36 dBmV, a directional coupler value of 20 dB may be used, or the combination of a lower value directional coupler and an attenuator pad.
2.5 POWER REQUIREMENTS The Sweep System Transmitter 3ST operates on 90-265 VAC, 57-63 Hz single phase input power source. 2.6 CABLE SPECIFICATIONS There are two cables associated with the operation of the 3ST Transmitter; Stealth to Stealth, and a Serial Printer cable. The following information describes each of the associated cables.
Serial Printer Cable The Serial Printer Cable, (1217-50-0151) can be used to print data directly from the 3ST Transmitter.
2.7 TECHNICAL SUPPORT Although we've worked hard to make the 3ST as easy-to-use as possible, the wide range of network architectures available today can make proper configuration a difficult task. If you have a problem using your unit you can contact Wavetek's Technical Support for help. You can reach Wavetek's Technical Support, Monday through Friday between 8 am and 5 PM at (317) 788-5960. Wavetek also maintains a support forum on the Internet.
(1) Specification Change - The transmitter output is being changed from +10 to +40 dBmV to +20 to +50 dBmV. To determine which transmitter output range is available on your unit, access the Status screen by pressing the FCN key followed by the status second function key. If "Enhanced Output" is displayed in the options box, the transmitter output range is +20 to +50 dBmV.
SECTION 3 USER INTERFACE 3.1 INTRODUCTION This section will help you become familiar with the front-panel controls of the Model 3ST Transmitter. Included are descriptions of the front-panel and notes on the use of features. 3.2 FRONT-PANEL DESCRIPTION The hardware portion of the user interface consists of a 320x240 dot matrix LCD and a 40-key keypad.
3.2.2 Measurement Mode Selection Keys Measurement modes are chosen by pressing the appropriate Measurement Mode Selection key. There is a key for each of the eight major measurement functions. These keys are located directly 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.
SCAN: Use the Scan mode to get a good look at absolute carrier levels. In this mode a bar graph showing all carrier levels is displayed. SWEEP: This mode injects a low level signal in vacant spectrum areas, and transmits telemetry to any 3SR Receivers that are connected to the system. Cable system carrier levels in occupied spectrum areas are monitored and displayed in bar graph format. NOTE: Telemetry occurs only while the unit is in Sweep mode.
3.2.3 Support Mode Selection Keys Support modes are accessed using the Support Mode Selection keys. There is a key for each of the four support functions. These keys are located to the right of the display. File: Allows the user to access measurement files. Auto: This function provides automated FCC 24 hour testing capabilities. Setup: The setup functions are used to set or adjust the operating parameters of the unit. Print: Allows the user to print the current measurement screen. 3.2.
3.2.5 Alpha-Numeric Entry Keys The Alpha-Numeric keys are used to enter data as needed during the operation of the unit. There are three indicators associated with keypad entry. These indicators appear in the title bar to the left of the time.
Alpha Entry 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 LEFT or RIGHT arrow keys. Special characters are available using the UP and DOWN arrow keys.
SECTION 4 OPERATION - HOW TO USE THE 3ST TRANSMITTER 4.1 INTRODUCTION This section provides detailed operation of the 3ST Transmitter. Included are detailed descriptions of the various displays of the selected modes of operation. 4.2 STEALTH SWEEP START-UP PROCEDURE The Model 3ST Transmitter is quite flexible with regard to sweep insertion, in that the sweep level relative to the other carriers is not extremely critical.
We recommend that the telemetry be set at 10 dB below the video carrier level. Any response irregularities caused by the combining network will be eliminated in the normalization process. After the transmitter is properly connected, the next step is to build a channel plan. This channel plan will designate which channels are active in the system, which channels are scrambled, and which channels are inactive and therefore can be converted to sweep injection points.
Editing A Channel Plan The next step is to edit the channel plan to characterize it for your particular system. Cursor down to Edit Channel Parameters and press ENTER. A listing of all the channels within the frequency range designated in the Build Channel Plan phase will appear on the screen. Notice that there are columns for enabled, channel type, channel number, label, frequency (video carrier), sweep, tilt, and, scrambled.
The next step is to test the sweep by connecting the Model 3SR receiver to a test point and pressing the SWEEP key (Ensure the 3ST Transmitter is also in the Sweep mode). After telemetry is found, the receiver will begin sweeping. If telemetry is not found make sure the 3ST Transmitter and the 3SR Receiver are configured for the same telemetry frequency. Check to ensure the level of the sweep, seen in empty spectrum areas, is 15 dB below video carrier level.
4.3.1 General Setup 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.
Operator Name Allows the user to enter the operators name. The name will appear in the header section of the Auto Test report. Contrast Level Adjusts the contrast level of the LCD for optimum viewing by the operator. The level is varied on a scale from 1-15. Use the UP and DOWN arrow keys to adjust the contrast. Contrast Level Adjusts the contrast level of the LCD for optimum viewing by the operator. The level is varied on a scale from 1-15. Use the UP and DOWN arrow keys to adjust the contrast.
Date Format Use the UP and DOWN arrow keys to select the desired date format. When the date format is changed, the new format will appear everywhere the date is displayed or printed. The following date formats are available: • MM/DD/YY • DD.MM.YY • YY.MM.DD Printer Sets the printer interface to the specific type of printer used. Use the UP and DOWN arrow keys to select the desired printer. The required serial printer configuration is as follows: • baud rate consistent with 3ST (recommend 9600 or 19.
Beeps The 3ST Transmitter produces beeps to alert you of certain operating conditions. The arrow keys are used to turn Beeps on or off as desired. Diagnostics Press the ENTER key to enter the diagnostic mode. The diagnostic mode allows the user to reset the unit to all factory default settings. Warning: All files and references will be lost when resetting the unit to factory default settings. 4.3.
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 to +100.0 dB in 0.1 dB steps). Frequency Tuning Step Size The Tuning Step Size can be adjusted using the UP and DOWN arrow keys or the numeric entry keys (0.01 to 100.00 MHz in 10 kHz steps).
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 calibration, highlight the selection and press the ENTER key. The unit will provide a prompt to ensure that no cable is connected to the RF input. Once verified, press the OK soft key to perform the calibration. The unit will display the system noise level when the calibration is complete. 4.3.
activate the selected channel plan. 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 Load soft key. The previously active channel plan can now be deleted.
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 frequency. The 3ST Transmitter will sequence through all channels in the selected fixed plan until the stop frequency is reached.
Use the UP or DOWN arrow keys to select the channel that you wish to edit.
Note: If the parameter that you wish to edit does not appear on the screen, keep pressing the arrow soft key to scroll through the list. Enabled Y/N - If the channel is not enabled it will not be included in any measurement modes. At least one channel must be enabled. If a channel is not enabled, it will be converted to sweep points in the "Build Sweep Points" process. Channel Type TV - Includes standard video carrier with audio carrier offset.
Label The label is provided to associate a channel's number with it's programming. Using the alpha keys, label the channel with a desired name (up to four characters). "Special" characters can be selected using the up/down arrow keys. The label will appear to the left of the channel number on most screens. Sweep Channel Y/N - Designates that the channel will be used for Sweep measurements.
Scrambled Y/N - Select Yes if the channel is scrambled. When a channel is designated as scrambled, the sweep will only look at the video carrier as a sweep reference, instead of both the video and audio carrier. Note: a diamond will appear to the left of the channel type indicator on most screens. Audio Offset Specifies the audio offset of the channel. Audio Offset 2 Specifies the offset for the second audio carrier of a Dual type channel.
If sweep points are entered in the following frequency ranges they will be automatically shifted to avoid measurement inaccuracies. 197.88 to 198.12 441.13 to 441.37 496.13 to 496.37 827.63 to 827.87 882.63 to 882.87 938.13 to 938.37 385.63 to 385.87 620.13 to 620.37 703.63 to 703.87 lower to 197.87 lower to 441.12 lower to 496.12 lower to 827.62 lower to 882.62 lower to 938.12 lower to 385.62 lower to 620.12 lower to 703.62 524.38 to 525.62 raise to 525.
Use the Up and Down arrow soft keys to cursor to a channel. Use the C/N, HUM, and MOD soft keys to select the desired Auto Test measurements. Note: C/N, Hum, 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.
Copy 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. Select the plan that you want to copy and press the Copy soft key.
4.3.5 Sweep Transmitter Forward Telemetry Frequency Use the UP and DOWN arrow keys or the numeric keypad to enter the telemetry frequency. NOTE: For successful Stealth mode operation, the Rx telemetry frequency must match the Tx telemetry frequency setting of the Model 3ST Transmitter. Caution: Do not place the telemetry signal too close to the diplex filter cut-off frequency in that roll-off may attenuate the telemetry signal to the degree that communication fails.
Use the UP and DOWN arrow keys or the numeric keypad to enter the telemetry level (20-50(1) dBmV). Forward Sweep Insertion Level This is the level at which the 3ST inserts (transmits) sweep points. All sweep points are inserted at the same level. Use the edit box to set the Sweep Insertion Level to an appropriate value (This will typically be at maximum (+50(1) dBmV) to over come test point loss.). Use the UP and DOWN arrow keys or the numeric keypad to enter the sweep insertion level (20-50(1) dBmV).
IMPORTANT: The frequency the reverse telemetry carrier should be carefully selected such that it will not interfere with any existing carriers on the reverse plant. Access Reverse Sweep Plans Reverse Sweep Plans are used to define the frequencies at which sweep points will be inserted by 3SR units with the Reverse Sweep option. To access Reverse Sweep Plans, select the “Reverse Sweep Plans” option and then press the ENTER key. Refer to section 5 for detailed operation. 4.
Scrambled Channel Label (up to four characters) Type: TV Single Dual Channel Number (0-999) Freq.
Scale Adjustment The UP and DOWN arrow keys can be used to adjust the reference level on the analog meter. This is helpful when the audio and video levels differ by large amounts. To automatically scale the analog meter, press the FCN key followed by the Scale second function key. When in the TV channel mode, the level is represented using dual analog meters; one for the video carrier and one for the audio carrier (two in the video + dual audio channels mode).
Information displayed in the Tilt mode is as follows: • High and low carrier frequencies • High and low carrier levels • Tilt measurement • Reference level and scale • Selected channel plan • Test point compensation (appears only if a nonzero value is programmed during setup) When the TILT 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.
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 at the top of the graph. NOTE: The reference value is limited by unit and the scale setting. Pressing the Auto Scale soft key will automatically set the reference level for an optimum Tilt display. The FCN + Scale key can also be used to automatically set the reference level. 4.
• Audio carrier frequency and level (numerical) • Histogram graph of carrier levels • Delta between audio and video levels • Selected channel plan • Test point compensation (appears only if a nonzero value is programmed during setup) • Limits annunciators When the SCAN key is pressed a graph showing all carrier levels is displayed. Use the RIGHT and LEFT arrow keys to position the marker to the desired channel. The channel numbers can also be entered directly using the numeric entry keys.
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.
• Adjacent Channel Error • Video Level Too High/Low • ∆VA Too High/Low The limit annunciators are updated with 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.
4.7 HOW TO MEASURE C/N It is a good engineering practice to use a bandpass filter on the input of the receiver when making C/N measurements. This is to ensure accuracy and extend measurement range. If a preamplifier is used to boost test point levels prior to measurement, it should be placed between the bandpass filter and the receiver. This measurement is simply a comparison in amplitude between the video carrier reference signal and the noise (FCC limit: > 43 dB).
Information displayed in the C/N mode is as follows: • Channel number • Channel label • Carrier frequency • Noise offset frequency • Noise frequency • Bandwidth • C/N ratio • Channel plan To make a carrier to noise measurement, press the C/N key. The C/N ratio of the tuned channel or frequency will be displayed. Bandwidth Adjustments To edit the bandwidth, press the BW soft key.
4.8 HOW TO MEASURE HUM Hum is undesirable modulation of the television video carrier by power line frequencies and harmonics (e.g., 60 or 120 Hz), or other low frequency disturbances (FCC limit: < 3%). To measure Hum, simply press the Hum key when tuned to any non-scrambled channel. In the Hum mode the hum modulation of the tuned channel or frequency will be displayed in either % or dB as selected by the operator.
Note: The <1kHz setting does not include the 1Hz component, it only includes 50 to 1000Hz. Information displayed in the Hum mode is as follows: NOTE: HUM measurements taken while the desktop charger is in use will affect the HUM reading. For the most accurate reading disconnect the charger prior to taking HUM measurements. 4.9 MODULATION This function allows you to monitor the video depth of modulation in graphical and precise numerical format. A marker is placed at the optimal modulation level (NTSC 87.
4.10 SPECTRUM ANALYZER 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.
Level Adjustments A LVL (level) soft key is used to adjust the vertical parameters of the graph. These parameters include Max Hold, Ref Level and Scale. The Max Hold function ensures that the highest signal over multiple sweeps is displayed. When the Max Hold soft key is pressed, as indicated in the left hand corner of the display, the highest signal level is displayed. The M1/M2 readings correspond to the max hold levels.
How To Make FCC In-Channel Response Measurements (FCC limit: , + 2 dB) The frequency response of any channel can be measured using the spectrum analyzer mode. A flat signal source must be inserted at the input of the modulator or processor. In testing a modulator this source may be a full field multiburst signal, or a sweeping function generator. For a processor, a bench sweep generator or a broadband noise source may be used.
Press the OK soft key once the carrier has been turned off. The CSO/CTB measurement is now displayed.
The light trace represents the carrier prior to it being turned off. The dark trace represents the distortion products. The measurement value is computed by a ratio of the peak level of the video carrier to the peak of the distortion products 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.
4.11 SWEEP MODE The Transmitter Sweep mode operates the same as the Scan mode with the following exceptions: • Sweep telemetry is transmitted • Sweep points are injected • Sweep point levels are displayed in the graph NOTE: Sweep telemetry will cease when another mode is selected.
4.12 FILE The File menu consists of two File submenus; Store Measurement, and Measurement Files. 4.12.1 How to Store/View/Delete Measurement Files The Store Measurement 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 access the measurement files. To store the measurement, press the Store soft key. The unit will then prompt for a file name.
To view measurement files, press the Measurement Files soft key. A listing of all currently stored measurement files is displayed. Use the UP and DOWN arrow keys to select the file to be viewed. Once selected, press the View soft key. Scan 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.
4.13 AUTO The Auto menu consists of three File submenus; Test Locations, Perform Auto Test, and Auto Test Results. 4.13.1 How To Create/Edit/Delete Test Locations Test Locations allow the user to create specific test point location parameters used in the Auto 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.
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.
Each location in the list has an associated type and values for the descriptive parameters. The parameters are shown in the following table. Parameter 1 Area 2 Amp Id 3 Power Configuration 4 Feeder Maker Config 5 Trunk Termination 6 Voltage Setting 7 Rev Pad 8 Rev Equalizer 9 Fwd Pad 10 Fwd Equalizer Min Max Default 15 column alpha numeric field 15 column alpha numeric field IN / OUT / THROUGH 1 9 1 NO YES NO LOW / MID / HIGH -100.0 +100.0 0.0 -100.0 +100.0 0.0 -100.0 +100.0 0.0 -100.0 +100.0 0.
Characteristic Trunk Head Extender Fiber Field 1 Area 2 Amp Id 3 Power Configuration 4 Feeder Maker Config 5 Trunk Termination 6 Voltage Setting 7 Rev Pad 8 Rev Equalizer 9 Fwd Pad 10 Fwd Equalizer yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes Editing of location files is done by pressing the Edit soft key. The optional fields will be enabled or disabled according to the location type selected (see table above).
Auto Test Location Using 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.
Use Up and Down arrow keys to scroll through the location characteristics for the test being performed. Press the ENTER key after each parameter is entered to update the display. If changes are made and you want them updated in the location file, press the Save soft key. If changes are made and the Save soft key is not pressed, the changes will only affect the Auto Test that is about to be performed. Press the OK soft key when completed.
Voltage Measurements Use 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.
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 to +100.0 dB in 0.1 dB steps). Press the OK soft key when the desired value has been entered.
Results File Enter a file name for the Auto Test results to be stored. If an existing file name is used, a warning message will appear prompting the user to overwrite the existing file or create a new one. When the desired file name has been entered, press the OK soft key to proceed with the Auto Test. Type Of Test Press the Immediate soft key to commence the Auto Test. Press the Scheduled soft key to perform the Auto Test repeatedly at scheduled intervals.
While the Auto Test is in progress, the measurement currently being performed (i.e. Level, C/N, Hum, or Modulation) is indicated on the screen. A bar graph showing the percentage of completion is displayed. Scheduled If the Scheduled mode is selected, the start, stop, and interval information must be entered prior to commencing the Auto Test.
Using the numeric entry keys, enter the start and stop information for the date and time as well as the interval amount. Press the ENTER key after each parameter is entered to update the display. Use the Up and Down arrow soft keys to select the parameter to be entered. Press the OK soft key to commence the Schedule Auto Test. If the first interval is to commence immediately, the unit will prompt you to enter the ambient temperature. The temperature displayed is the temperature sensed by the unit.
4.13.3 Viewing/Printing Auto Test Files Upon completion of the Auto Test, the unit will enter the Auto Test Results Mode to display the Auto Test files. This allows the user to view or print the Auto Test results. Use the Up and Down arrow soft keys to select a file, then press the View soft key. A Print All soft 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.
Information provided on each interval includes: • Interval number • Date measurement was made • Time measurement was made • Temperature • Pass/Fail test results An "X" in the Pass/Fail column indicates an overall failure 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.
------------------------------------------------------------------------WAVETEK STEALTH 24 HOUR TEST REPORT Model: 3ST Serial No: 1234567 Cal Date: 06/21/95 ------------------------------------------------------------------------Operator: JOHN File: PROOF1 ------------------------------------------------------------------------Location Name: 1028_ELM_ST Location Type: Trunk Test Point Type: Forward Trunk In Test Point Compensation: +0.
The channels with the asterisks indicate those channels that exceeded the Max Delta Adjacent Channels limit. The limits that the readings were compared to, are printed at the bottom of the report. To the right of the limits, the report displays each interval that failed the specific limit. If a particular measurement was not within the specified limit, a HI/LO marker is printed next to the reading indicating the direction that the measurement was out of specification.
Use the More soft key to toggle between Level measurements, C/N, Hum, and Modulation measurements.
------------------------------------------------------------------------WAVETEK STEALTH AUTO TEST REPORT Model: 3ST Serial No: 1234567 Cal Date: 06/21/95 ------------------------------------------------------------------------Operator: JOHN File: PROOF1 Inverval: 1 Date: 07/20/95 Time: 15:18:09 Temp: 75 F ------------------------------------------------------------------------Location Name: 1028_ELM_ST Location Type: Trunk Test Point Type: Forward Trunk In Test Point Compensation: +0.
4.14 STATUS To view the Status screen, press the FCN key followed 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. (1) Specification Change - The transmitter output is being changed from +10 to +40 dBmV to +20 to +50 dBmV.
SECTION 5 REVERSE SWEEP OPTION 5.1 INTRODUCTION This section provides detailed operation of the Model 3ST Reverse Sweep Option. Included are detailed descriptions of how to perform reverse sweeping as well as the various displays. 5.1.1 Wavetek Stealth Reverse Sweep Concept With the reverse sweep option, a transmitter is built into the handheld sweep receiver. The headend sweep transmitter (3ST) is set up to receive the reverse sweep sent from the field.
This is why it is best to transmit the sweep from the amplifier test point and measure it in the headend. This ensures that the system is properly aligned to carry signals in the reverse path. 5.1.3 Interfacing With Different Network Architectures Single Cable - Split Band Network The Model 3ST Sweep Transmitter is connected in the headend as shown in figure 1. The connections are similar to those made for forward sweep, with the transmitter output connected to the combining network.
Systems with directional test points are set up as shown in figure 2. In this configuration the DDC-20 is used to provide a sample of the reverse sweep output to the input of the 3SR receiver. Figure 2. Single Cable - Split Band Network Reverse Sweep Configuration With Directional Test Points. Another common architecture, which is only slightly different from those described above, prescribes the use of fiber optics to "nodes".
Combining Network System Sweep Transmitter 3ST FILE AUTO SETUP PRINT LEVEL TILT SCAN SWEEP C/N HUM MOD SPECT Figure 3. Transmitter Connections In Headend For Hybrid Fiber/Coax Networks Figure 4. Fiber Node Test Point Connections Dual Cable 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.
The problem is that the two systems use the same spectrum, making it impossible to distinguish between the two with one instrument. The recommended method for these systems is to first sweep the forward portion of the network, then move the transmitter out to the furthest extremity and sweep the reverse portion. 5.2 HOW TO SETUP FOR REVERSE SWEEPING To setup the Reverse Sweep on the 3ST, press the SETUP key and select the “Sweep Transmitter” option from the Setup menu.
IMPORTANT: Reverse Sweep should be disabled when there are no 3SR units being used with the Reverse Sweep option. This will optimize the update rate of the Forward Sweep. It should also be disabled if you are using the 3HRV for reverse sweeping. 5.2.2 Select the Frequency of the Reverse Telemetry Carrier This is the frequency at which 3SR units with the Reverse Sweep option will transmit telemetry data.
5.2.5 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 are creating. Use the alphanumeric 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. The Interval is entered next. This interval determines the spacing between sweep points. 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.
Sweep points are generated beginning at the Start 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. 5.2.6 Editing a Reverse Sweep Plan If desired, the selected Reverse Sweep Plan can be viewed and modified.
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 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.
APPENDIX A STATUS INDICATORS/ICONS INTRODUCTION There are numerous status indicators/icons displayed on the Stealth 3ST. 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.
APPENDIX B USER MESSAGES INTRODUCTION There are numerous user messages that will appear on the unit. Some messages can be caused by improper operation or unit malfunction. The following list provides an explanation of the condition that caused the message to appear, followed by the suggested response: Message ERROR... No STEALTH telemetry! Condition No telemetry established between Transmitter and Receiver Response Check connection and ensure telemetry frequencies are matched. Message SORRY...
Message ERROR... Insufficient signal level to perform the measurement! Condition A minimum carrier level is required for C/N and HUM measurements. Response Choose another channel or frequency with greater than the minimum level. Message SORRY... This is an illegal name and cannot be used. Condition An illegal name has been entered. Response Choose another name. Message WARNING...A reference with this name already exists. Overwrite? Condition A reference with the same name currently exists.
Message ERROR... The selected reference has been corrupted! Condition The reference cannot be used because of a non-volatile memory failure. Response Delete the corrupted reference and select another. Message store time in SORRY... Not enough sweeps have occurred to an accurate reference. Please allow more SWEEP. Condition An attempt to store a reference without sufficient sweeps. Response Allow more time in Sweep Mode. Message ERROR...
Message SORRY... There is not enough memory to store a new file! Condition Memory is currently at maximum capacity. Response Delete unwanted files to make more memory available. Message deleted! WARNING... The selected sweep file will be Condition Response A sweep file is about to be deleted. Press OK to delete. Message ERROR... The selected sweep file has been corrupted! Condition The file cannot be used because of a non-volatile memory failure.
cancel. Message SORRY... The active plan cannot be deleted! Condition An attempt to delete the active channel plan. Response Select a different plan as the active plan, then delete the desired plan. Message ERROR... This plan is corrupted and cannot be used! Condition The plan cannot be used because a non-volatile memory of failure. Response Delete the plan and then choose another. Message WARNING... A plan with this name already exists.
Response Message least delete the Press OK to delete, STOP to cancel. SORRY... The last channel cannot be deleted! Condition An attemp was made to delete the last channel of a plan. Response A channel plan must contain at one channel. If desired, entire plan. Message WARNING... This operation cannot be undone! Condition An operation has been selected that will make permanent changes to a stored file. Response Press OK to execute, STOP to cancel. Message SORRY...
Response Press OK to reset settings, STOP to cancel. Message ERROR... C/N cannot be measured on a scrambled channel! Condition A channel that has been programmed as scrambled in setup has been selected in C/N mode. Response Select a channel that is not scrambled. C/N measurements are not possible on a scrambled 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.
