Attachment_1E1_Continental_Electronics_Preventive_Maintenance_version_1.0.pdf

ENGINEERING HANDBOOK 7 SECTION 4.4

NWR Maintenance Schedule EHB-7 8/2/16

COMMUNICATIONS EQUIPMENT MAINTENANCE SCHEDULE – CONTINENTAL

TRANSMITTERS

Office of Dissemination

W/DISS: CH

SUBJECT: NWR Continental Electronics Transmitter Preventive Maintenance Schedule and Performance Measurements

PURPOSE: To provide periodic monitoring, maintenance, and performance measurements for the NOAA Weather Radio (NWR) Continental transmitters. This will ensure that the quality of NWR broadcasts and the issuance of warnings to the listening public are within published specifications.

SITES AFFECTED: All Continental Electronics Corporation (CEC) model NWR Transmitter Sites

AUTHORIZATION: The authority for this schedule is by National Weather Service Headquarters direction.

VERIFICATION STATEMENT: This procedure was tested and verified at Cameron, MO (300 Watt (W) dual).

ESTIMATED COMPLETION DATE: Monthly: Remote maintenance

Every 12 months: On-site Maintenance – performed by the National Maintenance Contractor; performed by National Weather Service (NWS) technicians or regional/local contractor technicians (Regional Headquarters can specify a 4- or 6-month interval – refer to the following).

Every 4 or 6 months: On-site Maintenance for dusty/dirty sites – performed by the National Maintenance Contractor;

performed by NWS technicians or regional/local contractor technicians (interval at the Regional Headquarters’ discretion).

Annually (9 to13 months): Signal strength measurements.

NOTE: When a corrective maintenance service call is made at a transmitter site, perform the routine (preventive) maintenance procedures listed in Table A-2 (except for the Backup Generator Checks and Signal Strength Measurements).

TIME REQUIRED: Monthly remote maintenance: 15 minutes

On-site Maintenance: 2 hours

Annual field strength measurements: 8 hours

ACCOMPLISHED BY: NWS and/or contractor electronics technicians

EQUIPMENT AFFECTED: Continental model WR300B and WR1000B transmitters (B272/B270)

SPARES AFFECTED: None

SECTION 4.4 ENGINEERING HANDBOOK 7

EHB-7 NWR Maintenance Schedule 8/2/16 2

PARTS/MATERIALS REQUIRED: Air filters (if required)

SOURCE OF PARTS/MATERIALS: National Maintenance Contractor (Contact NWS Headquarters either by phone or e-mail for the Contractor information.)

(301) 427-9199

(301) 427-9192

DISPOSITION OF REMOVED

PARTS/MATERIALS: Not applicable (N/A)

TOOLS AND TEST EQUIPMENT

REQUIRED:

• Communications Analyzer (e.g., IFR FM/AM1200S/SS Comms Monitor with tracking function (option 12) or equivalent)

• Ameritec AM-48(XT) Transmission Line Test Set or equivalent sine wave frequency generator capable of 1000 Hertz (Hz) and 1-volt alternate current (AC) root-mean-square (RMS) output

• CEC Interface Application

• Digital multimeter (DMM)

• AC RMS voltmeter (e.g., HP 400E or equivalent)

• Wattmeter or Power Meter/Sensor/directional coupler/laptop combination (e.g., Bird 43 with 25W, 50W, 100W, 250W, 500W, 1000W, 2500W elements)

• 1500W Dummy Load

• Signal Strength Meter or Signal Strength Measurement System

• Telephone buttset with RJ-11 modular adapter available

• Two 3-foot type N male to N male RG142B/U cables (Pasternack PE3455-36)

• 2-foot (25 inches end-to-end) DIN female to N male LMR-400 adapter cable

• 2-foot (25 inches end-to-end) N male to N female LMR-400 adapter cable

• Two N male to BNC female adapters

• DIN male to N male adapter

• 7-16 DIN male to N female adapter (Pasternack PE9179)

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• 7-16 DIN female to N male adapter (Pasternack PE9178)

• Type N male to N male adapter (Pasternack PE9007)

• Type N female to N female adapter (Pasternack PE9006)

• Two 4-foot BNC cables with BNC male on each end

• (Optional) BNC cable, approximately 6 feet, BNC male one end, alligator clips on other end (if not using AM-48) and BNC Tee

• RS-232 cable, 9-pin female to 9-pin male connectors (not Null Modem), 4 to 6 feet (part of Nautel accessory kit)

• USB(A) to USB(B) printer cable, 4 to 6 feet

• (Optional) USB(A) to RS-232 (male) adapter cable

• Vacuum cleaner

• Tool Kit (including a 12-inch Crescent wrench, #1 and #2 Phillips screwdriver, 3/8-inch nutdriver)

• Trimpot Adjustment Tool (5-inch), GC 8608 (Contact East #191 470)

DOCUMENTS AFFECTED: Continental Electronics Technical Manual (Field Level), Operation and Maintenance, WR300B and WR1000B Transmission System (Issued – 8 July 2015)

Generator and Automatic Transfer Switch operators/maintenance manuals

CRS Maintenance Manual, Appendix H, CRS System Alignment Procedures, Section H.6.2, DECtalk Synthesized Voice Output Level Adjustment

AM-48 Instruction Manual

Communications Equipment Maintenance Note 59, Revision A, ROAMS Sealed Lead-Acid Battery Replacement

Communications Equipment Maintenance Schedule NWR Transmitter EPG System: Kohler 12RES and 30RYG Engine Generator Set and MPAC 1500 Automatic Transfer Switch

SUMMARY OF CHANGES: N/A

https://www.ops1.nws.noaa.gov/Secure/CRS/Maintmanual/AppH_rev10_2011.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/Maintmanual/AppH_rev10_2011.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/Maintmanual/AppH_rev10_2011.pdf http://exodus.poly.edu/%7Ekurt/manuals/manuals/Other/AMERITEC%20AM48,%20AM48E%20Instruction.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/MaintNote/ComEquipMaintN59A_S.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/MaintNote/ComEquipMaintN59A_S.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/NWR_EGS_ATS_Maint_Schedule-1_signed.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/NWR_EGS_ATS_Maint_Schedule-1_signed.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/NWR_EGS_ATS_Maint_Schedule-1_signed.pdf

8/2/16 4

PROCEDURE: Perform maintenance as specified in the following attachments:

ATTACHMENT A - Continental Transmitter Site Preventive Maintenance Procedures

Part 1 - Preventive Maintenance Table and General Maintenance Procedures

Part 2 - Preventive Maintenance Procedures for Continental Model WR300B and WR1000B Transmitters

ATTACHMENT B - Providing Audio Test Signals to the Transmitter

Part 1 - Generating the 1050 Hz Alert Tone Using the CRS

ACP

Part 2 - Generating SAME Burst Tones from the NWRSAME Hardware Panel

Part 3 - Generating SAME Burst Tones and Alert Tones from the CRS Application

Part 4 - Confirm Transmitter Transfer using ACP and CRS Application

ATTACHMENT C - Ameritec AM-48 Transmission Test Set Initial Setup

ATTACHMENT D - IFR 1200 Communications Monitor to View Modulation and Deviation Setup

ATTACHMENT E - Continental Transmitter Maintenance Record and Measurement Form

TECHNICAL ASSISTANCE: For questions or problems pertaining to this maintenance schedule, contact:

Maintenance Program Engineer: (301) 427-9199

Upper Air Systems Program Leader: (301) 427-9192

Senior Technician: (301) 427-9677

REPORTING INSTRUCTIONS: Report all NWR preventive maintenance activity using the Engineering Management Reporting System (EMRS) according to the instructions in EHB-4, Appendix G.

Additional reporting instructions and sample EMRS forms are available at https://www.ops1.nws.noaa.gov/Secure/NWRreporting.htm.

Include the following information on the EMRS report:

Station ID (block 6): XXXXX (SID)

Equipment Code (block 7): BXXX (refer to Table 1)

Serial Number (block 8): unit serial number.

https://www.ops1.nws.noaa.gov/Secure/NWRreporting.htm

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Table 1: NWR Transmitter Equipment Codes

EQUIPMENT TYPE EQUIPMENT CODE

Dual NWR 1000W Transmitter (Continental) B270 Dual NWR 300W Transmitter (Continental) B272

Thomas J. Day Chief, Services Branch

Attachment A – Continental Transmitter Site Preventive Maintenance Procedures Attachment B – Providing Audio Test Signals to the Transmitter Attachment C – Ameritec AM-48 Transmission Test Set Initial Setup Attachment D – IFR 1200 Communications Monitor to View Modulation and Deviation Setup Attachment E – Continental Transmitter Maintenance Record and Measurement Form

A-1 8/2/16

ATTACHMENT A CONTINENTAL TRANSMITTER SITE PREVENTIVE

MAINTENANCE PROCEDURES

A.1 PART 1 Preventive Maintenance Table and General Maintenance Procedures

A.1.1 Routine Remote (Off-Site) Performance Monitoring The technician remotely monitors the transmitters at all sites on a MONTHLY basis to verify that parameters remain within specifications. For remote dial-in monitoring, the Continental transmitters use Remote Off-Air Monitoring System (ROAMS) and CEC Interface Application.

NOTE: Table A-1 provides an overview of the monitoring checks. The letters in braces { } refer to the specific procedures which follow Table A-1.

Table A-1: Remote Performance Monitoring Schedule for Continental NWR Transmitters

ALL MONITORING CHECKS TO BE PERFORMED EVERY MONTH.

Sites without a remote access phone line do not have to report these maintenance functions.

Maintenance Function Procedure Overview Remarks

{A} Remote Check of Voice Broadcast Quality and Stored Fault Conditions

Install, set up, and start the CEC Interface Application but do not dial into transmitter until ROAMS is put to sleep.

Dial into ROAMS using a touch-tone phone and check for alarms, audio input, and quality of ROAMS receiver broadcast audio. Put ROAMS to sleep.

Determine the problem if an alarm condition exists – a trip to the site may be necessary.

{B} Remote Check of Exciter/Power Amplifier Currents, Supply Voltages, Transmitter Forward and Reflected Power, Antenna VSWR

Dial-in and monitor using the CEC National Oceanic and Atmospheric Administration (NOAA) Interface Application. Save the current configuration.

If any alarms are present or Antenna VSWR is greater than 1.5:1, troubleshoot and correct as necessary.

{C} Ensure Appropriate Transmitter is Broadcasting Based on Year: TXA for Odd Years, TXB for Even Years

Reference procedure to transfer as necessary.

Transmitter TXA should be broadcasting during odd years (e.g., 2015-TXA) and transmitter TXB should be broadcasting during even years (e.g., 2016-TXB).

{D} Disconnect from Transmitter and Save Files

Disconnect/close remote application and attach configuration to the EMRS report.

8/2/16 A-2

{A} Remote Check of Voice Broadcast Quality and Stored Fault Conditions

1. If the CEC Transmitter Interface application is installed and Site to Call Stations.txt file is configured on a laptop computer, skip to Step 8.

If not previously installed on a PC, download, install and set up the CEC NOAA Transmitter Interface application (refer to Steps 2 through 7).

NOTE: Refer to the Continental Electronics Operations and Maintenance Technical Manual, Sections 2.4.1, 2.4.2, and 3.2 for detailed information on installing and using the application.

2. Navigate to the Welcome to the Surface/Upper Air Division Web page (https://www.ops1.nws.noaa.gov). In the NWR/CRS/BMH section, click on NWR Transmitter Remote Applications and Software/Firmware Updates.

3. Log in for access with the username and password.

4. Go to the Crown/Continental heading and under the Generation 2 Transmitters, click on CEC NOAA Transmitter Interface Application and download the remote application.

5. Double-click on the NOAAGUIInstaller_vx_x_x.exe file to install and extract the FTDI CDM drivers to the laptop.

6. If necessary, set up the laptop internal modem for the appropriate dial-up parameters.

7. Edit the Site to Call list with the following procedure:

Navigate to the Stations.txt file in the NOAA Transmitter Interface folder (Program Files a.

sub-directory).

Double-click the file to open it in the text editor. The Windows default program associated b.

with this extension (.txt) is the Windows Notepad program. It is in comma-separated value (.csv) format.

Enter site information under the CEC Main Board Only Internal… entry line in the following c.

sequence: Location, State, Call Sign, Phone, IP Address (most likely 127.0.0.1 for a dial-up connection).

Select File, then Save to overwrite the Station.txt file. d.

8. With a modem connected to an outside dial line, start the CEC NOAA Transmitter Interface application on the laptop by double-clicking on the CEC icon (unless already minimized).

9. Make sure Remote is selected in the Connection box (lower left of screen) and Dial-up is selected in the Connect Using box.

10. On the Application screen, at the top menu, click on Tools and select Station Settings. Verify the parameters are correct.

11. Click on the Connect button to bring up the Dial-Up dialog box. Using the Site to Call down arrow drop-down menu, select the <appropriate site> to dial into.

12. Leave NOAA Transmitter Interface application window on the desktop and proceed to the next step.

13. Dial into ROAMS using a touch-tone phone.

14. Wait for the 3 to 4-second modem tone to end.

https://www.ops1.nws.noaa.gov/

A-3 8/2/16

15. ROAMS will then enter human interface mode and report the site ID number.

16. Listen to the alarm status message. The ROAMS voice should state, Alarm Number 1 (or 2) Inactive, indicating the alarm status of the inactive or standby transmitter. Determine the problem if an alarm condition exists – a trip to the site may be necessary.

17. ROAMS will request a password. Immediately key in the first digit (of the 3-digit code), waiting until the keystroke is echoed by ROAMS. Repeat for each of the other 2 digits. Dial into ROAMS again if unable to enter password properly.

18. Press 3 to monitor NWR audio input for 20 seconds. The audio should be clear and undistorted. Wait until ROAMS asks for the next command.

19. Press 4 to monitor ROAMS receiver broadcast audio for 20 seconds. Listen for possible distorted audio, low power beeps, etc. Wait until ROAMS asks for the next command.

20. Press 1, listen to the status (press 2 if there is an active alarm), then press 5 to put ROAMS to sleep allowing access to transmitter modem (but only for 2-5 minutes) and to terminate call.

21. Proceed immediately to the NOAA Transmitter Interface window (previously minimized) on the laptop.

22. Click on Make Connection to dial into the appropriate site transmitter.

23. Enter the Username and Password in the dialog box and click OK to start dialing out.

24. The Interface window will show connection established in the log section. Proceed to the next section to check the transmitter operating parameters.

25. If sleep mode times out, repeat previous steps to put ROAMS back to sleep. The modem takes a few minutes to connect and then the application populates with transmitter parameters indicating connection to the transmitter.

26. If any connection failures or anomalies occur, contact the NWS Headquarters Senior Technician at (301) 427-9677.

8/2/16 A-4

{B} Remote Check of Exciter/Power Amplifier Currents, Supply Voltages, Transmitter Forward and Reflected Power, Antenna VSWR

1. Using the Transmitter Interface window, check the transmitter operating parameters by selecting

View, then Transmitter A, then Transmitter B. Make sure the Exciter/Power Amplifier Currents, Supply Voltages, Transmitter Forward and Reflected Power, and Antenna VSWR are within the normal operating range.

2. To save the operating parameters to a file, click on the Save Stn Date button on the Interface window.

3. Select a file and name using the following format: <Call Sign_yyyymmdd>_PMI.csv

4. Click on Save.

5. At the top pull-down menu, click on View, then Event Log. The Event Log will be downloaded (this could take up to 20 minutes).

6. Click on Save Log to save the data using the format <Call Sign_yyyymmdd>_EVT.csv

7. Click on Save, then click Exit.

{C} Ensure Appropriate Transmitter is Broadcasting

1. Check that the appropriate transmitter is broadcasting based on the current year by checking the Active Tx window.

Transmitter TXA should broadcast during odd years (e.g., 2015-TXA); transmitter TXB should broadcast during even years (e.g., 2016-TXB). If not, perform the following:

2. Click on the Switch Active Tx button to change the Active Tx parameter to the appropriate transmitter according to the year.

TXA for odd years

TXB for even years

{D} Disconnect From Transmitter and Save Files

1. Click Disconnect, then File, and Exit to close the application.

2. Attach the CSV files (PMI and EVT if saved) to the EMRS A-26 page and send to the appropriate NWR site point of contact.

A-5 8/2/16

A.1.2 On-Site Routine Maintenance Perform routine maintenance every 4, 6, or 12 months, depending on who is performing the maintenance and the transmitter site conditions (or by Regional Headquarters discretion), according to the requirements stated in Table A-2.

When a corrective maintenance service call is made at a transmitter site, perform the routine maintenance procedures listed in Table A-2 (except for the Backup Generator and ATS Checks and Signal Strength Measurements).

The maintenance data log attached to the transmitters must be updated after each maintenance action and a copy of the log submitted to the designated Government offices. In addition, the Continental Transmitter Maintenance Record and Measurement Form (Attachment E) should be completed as the maintenance functions are performed. Alternatively, instead of filling out Attachment E for Maintenance Functions {4}, {5}, and {6}, the CEC Interface Application can be used to save the transmitter parameters to a CSV file, which is subsequently attached to the EMRS A-26 page.

Upon completion of routine maintenance, the transmitter system must be made fully operational and functional at the authorized output power, within required frequency and modulation tolerance, and in compliance with all technical descriptions and specifications of the manufacturers’ equipment manuals.

At least twenty-four to forty-eight hours prior to the scheduled transmitter preventive maintenance visit (or prior to a corrective maintenance visit where routine maintenance is also performed), the WFO Electronic Technician (El Tech) must perform the Console Replacement System (CRS) System Alignment Procedures in the CRS Maintenance Manual, Appendix H, CRS System Alignment Procedures. The El Tech must use the AM-48 Test Set to verify that the CRS levels leaving the WFO to the appropriate transmitter to be tested are set properly for the following: Alert Tones and transmitter Transfer Tones from Audio Control Panel (ACP)1 and ACP2, SAME tone generated by the NWRSAME Panel, and the Alert, Transfer, and SAME tones generated by the CRS Application/DECtalk Card.

Twenty-four hours prior to the start of on-site transmitter maintenance, the El Tech must contact the associated WFO to request a Public Information Statement (PNS) be issued advising the public that the transmitter will be undergoing maintenance and broadcasts may be periodically interrupted.

For the audio input level tests (Maintenance Function {8}, Transmitter Audio Input Level Verification), the technician will request that the WFO transmit the alert tone and SAME tones for the purpose of verifying proper signal level on the transmitter audio program line (described in Attachment B, Parts B.1 through B.4). Any change in audio input level outside the specifications must be reported to the WFO maintenance focal point.

CAUTION

For maintenance function number {8}, the transmitter output MUST be put into a dummy load.

NOTE: Numbers in braces { } refer to the applicable sections of Attachment A, Part A.2.

8/2/16 A-6

Table A-2. On-Site Preventive Maintenance and Performance Measurement Schedule – Continental

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS TO BE PERFORMED

EVERY 4, 6 OR 12 MONTHS

Maintenance Function Procedure Overview (Refer to the detailed procedures in Attachment A, Part A.2)

Remarks

{1} Clean or Replace Air Filters

Clean Modules, Fans, and System Cabinet

Vacuum and brush any dirt from the cooling fans.

Vacuum any dirt from the base of the transmitter system cabinet.

Power off the appropriate transmitter and circuit breaker prior to performing.

Lock Out/Tag Out breaker.

{2} Visual Inspection of Chassis and Operational Check of Cooling Fan(s)

Visually check for signs of burned or broken components/assemblies and loose or damaged cables. Check for proper operation of cooling fans (and if noisy).

Take corrective action as needed.

{3} Check AC Input Voltage, AC Surge Protectors, Lamps, Light-emitting Diodes (LEDs), Readouts/Displays, and ROAMS Battery Date

Measure AC input voltage. Visually check all surge protectors, lamps, LEDs, and readouts to ensure that they indicate at proper times. Check the ROAMS battery date code. Replace as necessary.

Replace ROAMS battery if over 4 years old.

{4} Transmitter Forward and Reflected Power and SWR Verification

Record readings and compare with previous readings.

High-reflected power may indicate a bad cavity, antenna cable or antenna.

{5} Transmitter Exciter/Power Amplifier Supply Voltage and Current Verification

Record readings and compare with previous readings.

If any voltages or currents are abnormally high or low, troubleshoot.

{6} Transmitter Carrier Frequency Verification

Carrier frequency must be within ± 200 Hz. Adjust if necessary.

{7} Transmitter Voice Modulation and Deviation Level and Quality Verification

Frequency deviation must not exceed ±5 kHz.

Use a Comms Analyzer – warm up for at least 30 minutes.

A-7 8/2/16

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS TO BE PERFORMED

EVERY 4, 6 OR 12 MONTHS

Maintenance Function Procedure Overview (Refer to the detailed procedures in Attachment A, Part A.2)

Remarks

{8} Transmitter Audio Input Level Calibration and Verification

a. External Source Input Level Calibration

b. 1050 Hz Alert Tone

c. NWRSAME Signal Level from Hardware Panel

d. NWRSAME and Alert Tone Level from CRS Console

Twenty-four to forty-eight hours prior to visit, perform selected procedures (H.1, H.2, H.4, H.6) from CRS System Alignment, Appendix H, CRS Maintenance Manual.

Disconnect audio input line from WFO, inject -10dbm, 1kHz signal at input to transmitter, verify 4.5KHz deviation on IFR Comms Monitor.

Alert Tone and SAME signals are generated at the WFO and measured at the transmitter audio input using a communications monitor. The WFO will perform the procedures in Attachment B.

Ensures proper output levels at the WFO from CRS ASM card.

Ensures proper deviation using an external audio signal source at the transmitter input.

Test tones are generated at the WFO.

{9} Verify Proper Transmitter Transfer Using ACP and CRS Console Software Application;

Final Transfer to Appropriate Transmitter (Dual Transmitters Only)

Call the appropriate WFO and have the operator switch transmitters using the CRS ACP and CRS console software application; WFO to execute final transfer to odd year (e.g., 2015-TXA) or even year (e.g., 2016-TXB) transmitter.

ROAMS still disabled when switching transmitters.

Refer to Note 4.

{10} Backup Generator and Automatic Transfer Switch Checks and Testing (NWS-owned)

Check all fluid levels. Visually check generator for fluid leaks, damage, or debris.

Test automatic transfer switch (if applicable) and generator.

Only to be performed on NWS-owned equipment. Contact appropriate NWS Regional point of contact for site-specific generator guidance.

NOTE 1: Test equipment used for the procedures must have a current calibration certificate and date sticker traceable to the National Institute of Standards and Technology (NIST).

NOTE 2: Warm up the Communications Analyzer at least 30 minutes prior to using it for measurements.

NOTE 3: After Procedure {8} in the previous table has been performed, the antenna cable will be disconnected from the dummy load and reconnected to the antenna.

NOTE 4: Procedure {9} attempts to equalize the operating time for each transmitter (dual models) and to simplify which transmitter should be broadcasting at a given time.

8/2/16 A-8

Table A-3. Off-Site Performance Measurement Schedule for Continental Transmitters

ALL MEASUREMENTS TO BE PERFORMED ONCE PER YEAR

Maintenance Function Procedure Remarks

{11} Signal Strength Measurement

Refer to the procedures in Attachment A, Part A.2 {11}

Time interval: 9 to 13 months

Normally performed by NWS technicians or Regional Maintenance Specialists.

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A.2 PART 2 Preventive Maintenance Procedures for Continental Model WR300B and WR1000B Transmitters

A.2.1 WFO Notification of Maintenance, Inhibiting ROAMS Dial-out, Power Down

NOTE: Twenty-four hours prior to the start of on-site transmitter maintenance, the electronics technician must contact the associated WFO to request a PNS be issued, advising the public that the transmitter will be undergoing maintenance and broadcasts may be periodically interrupted (specify start time and number of hours).

1. Turn on and warm up the Communications Monitor (e.g., IFR 1200S). Set up the Comms Monitor for the proper frequency (refer to Attachment D for the IFR 1200 setup). The warm-up time is approximately 30 minutes.

2. Disconnect the ROAMS phone line from the Telephone Network Interface box (or associated RJ11 jack) so ROAMS will not call the WFO when transmitter maintenance is being performed.

The ROAMS phone line may then be used to communicate with the WFO.

3. Listen to the NWR broadcast to verify the special PNS maintenance statement is being broadcast. If not, contact the lead forecaster at the controlling WFO and request that they issue a PNS advising the public that the transmitter will be undergoing maintenance and broadcasts may be periodically interrupted.

4. Transfer to Local Control: On the Redundant Transmitter Control, push the REM/LOC switch so that the LED below R/L glows red (the LED below PWR is still green). Refer to Table 3-2 (pages 3-4) in the Continental Electronics Technical Manual for a description of the RTC Controls and Indicators.

5. Push the DISABLE AUTO SELECT and VOX DISABLE switches so the LEDs above the switches are solid red. The Enable Backup LED should not be red.

6. A laptop with the CEC Interface Application installed can be connected now to the local serial or Universal Serial Bus (USB) port of the RTC front panel using the appropriate cable. If connecting for the first time, the order of preference to connect to the controller is:

A USB(A) to USB(B) printer cable a.

A USB to RS232 adapter cable (using the driver CD) plus the RS232 cable (e.g., COM6) b.

The RS232 cable (e.g., COM1) c.

Once connected to the controller panel, be sure to confirm that the COM driver was correctly installed and note the COM port number under Windows Device Manager (under Ports or Universal Serial Bus Controllers).

7. For a 300W and 1000W dual transmitter system, on the non-broadcasting transmitter, turn OFF the power switch (CB1) in the back of the TXA or TXB transmitter assembly (next to the power cord).

8. Locate the appropriate circuit breaker in the NWR transmitter electrical panel box, then turn the circuit breaker for the transmitter to be cleaned to the OFF position. Use standard Lock Out/Tag Out procedures to secure the breaker.

8/2/16 A-10

{1} Clean or Replace Air Filters, Clean Modules, Fans, and System Cabinet (non-broadcasting transmitter)

(Refer to Section 5.4.42 in the Crown Operation and Maintenance Manual)

1. Remove dust from the cabinet, chassis, and panels with a soft-bristled brush and vacuum.

Clean flat surfaces and accessible areas with a lintless cloth moistened with rubbing alcohol.

Dry with a clean, dry, lintless cloth.

2. There is one filter in each 300W or 1000W Transmitter Assembly. In the non-broadcasting transmitter, remove the screws from the front panel filter covers to access each of the air filters.

If the filters are very dirty, they may be changed with spare new ones and the old ones taken back to be washed in mild soap and water, then dried. Replace the air filter(s) if they can no longer be cleaned. Replacement filters are available from the national maintenance contractor using the following part numbers:

300W, front panel, Transmitter Assembly A2 and A3, 16.375" X 4.5" foam: 21205K22

1000W, front panel, Transmitter Assembly A2 and A3, 16.375" X 4.5" foam: 21205K22

3. Re-install the air filters and covers.

4. If in an extremely dirty environment, for the non-broadcasting transmitter, turn off the transmitter power switch (CB1) and the electrical panel circuit breaker. Disconnect any cables from the back of the units, remove the four front panel screws and pull out the units from the rack. Then use dry and oil-free compressed air, a soft bristle brush, and a vacuum to remove any dust that accumulates on the modules, circuit cards, and other components.

5. Record which filters were replaced in Attachment E {1}.

{2} Visual Inspection of Chassis and Operational Check of Cooling Fan(s) Check for signs of burned or broken components/assemblies and loose or damaged cables.

Make sure all the cooling fans (in the back) of the broadcasting transmitter are operating properly and are not abnormally noisy (look in back to view the fans). Record the location of any failed or defective fans in Attachment E {2}.

{3} Check AC Input Voltage, AC Surge Protectors, Lamps, LEDs, Readouts/Displays, and ROAMS Battery Date

WARNING

Use extreme care when measuring transmitter AC input voltage. Dangerous voltages are present at AC input terminals. Severe injury or death may occur upon contact with live AC input terminals. Ensure power is OFF at the circuit breaker panel if it is necessary to connect or disconnect the AC input cables. Use standard Lock Out/Tag Out procedures to secure the breaker.

A-11 8/2/16

1. Check the AC input voltage by using a multimeter to measure the voltage at the twist lock socket at the back of the AC distribution assembly where power exits the assembly (transmitter must be powered down first). If AC power enters at the top of the cabinet, this can be done by unscrewing the top AC distribution access panel and checking the voltage at the terminals. Depending on the transmitter model and type of power supplied, the input voltage should be 115 VAC (±10%), 208 VAC (±10%) (three phase), 220 VAC (±10%), or 230 VAC (±10%) (single phase). Contact the power company if outside the ±10% range.

2. Check the indicator lights on the AC surge protectors (by the AC Breaker/Power Panel) to ensure they are still properly protecting the power line (two green LEDs are on). Replace the protector as necessary.

3. Check the LEDs and LCD displays of the broadcasting transmitter. Record all information in Attachment E {3}.

4. Check the battery date code written on the outside of the ROAMS chassis (if no date was written on the outside of chassis, battery must be removed from ROAMS chassis and examined - refer to NWR Maintenance Note 59 Rev A). The date code format of the Power- Sonic model PS-612 is MO DD Y M (where MO = month, DD = day, Y = year, and M = for mfr.

use. For example, 12144L is Dec. 14, 2004). The format of the Panasonic model LCR6V1.3P is Y MO DD (where Y = year, MO = month, and DD = day. For example, 041214 is Dec. 14, 2004). Record the battery date in Attachment E. If the battery is over 4 years old, replace it with a Power-Sonic model PS-612 (or Panasonic LCR6V1.3P). Refer to NWR Maintenance Note 59 Rev A (ROAMS Sealed Lead-Acid Battery Replacement) for the replacement procedures.

NOTE: The transmitter parameters measured in Maintenance Functions {4}, {5}, and {6} may be saved in the Continental Interface Application to a CSV file instead of recording in Attachment E.

{4} Transmitter Forward and Reflected Power, and SWR Verification

NOTE: Skip Steps 1 through 5 if the external power meter is already attached to an antenna.

1. If the R/L LED is not still glowing red, press the REM/LOC front panel switch. If the LED above the Disable Auto Select switch is not glowing red, press the DISABLE AUTO SELECT switch.

2. Turn off the broadcasting transmitter prior to attaching an external power meter: For a 300W or 1000W dual transmitter system, turn OFF the power switch (CB1) in the back of both transmitters.

3. Locate the appropriate circuit breakers in the NWR transmitter electrical panel box, then switch the circuit breaker for both transmitters to the OFF position. Ensure all transmitters are OFF.

Use standard Lock Out/Tag Out procedures to secure the breaker.

4. Carefully remove the antenna transmission line from the cavity, taking care not to bend it.

NOTE: The Bird 43 wattmeter is most accurate when reading full scale. It is therefore recommended to use the elements specified in the next step.

https://www.ops1.nws.noaa.gov/Secure/CRS/MaintNote/ComEquipMaintN59A_S.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/MaintNote/ComEquipMaintN59A_S.pdf https://www.ops1.nws.noaa.gov/Secure/CRS/MaintNote/ComEquipMaintN59A_S.pdf

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5. Install the appropriate calibrated external power meter, directional coupler, or power sensor (use appropriate element for a Bird 43 - 500W element for WR300B, 1000W element for WR1000B) between the cavity RF directional coupler connector and the antenna cable. (A 7-16 DIN male to Type N female adapter may have to be used, along with a 25-inch LMR-400 Type N male to male cable, to prevent the heliax from bending.) The proper cable length is necessary to maintain antenna cable phasing).

6. Switch the circuit breaker in the NWR transmitter electrical panel box for the transmitter that had been broadcasting to the ON position.

7. For the WR300B or WR1000B transmitter that had been broadcasting, turn ON the power switch (CB1) on the back of the transmitter.

8. On the Redundant Transmitter Control (RTC) panel, make sure the LED below the R/L is glowing red. If not, push the REM/LOC switch.

9. Record the forward and reflected power value from the external power meter in Attachment E {4} and compare with previous readings. The forward power reading should be within 5% of the external wattmeter reading. If reflected power is more than 4% of forward power, perform corrective action. (Reflected power measurement is for Bird 43 wattmeter only. Note the position of the arrow direction of the power element currently installed in the wattmeter used to measure the forward power. Remove that element and replace it with a 50W element, ensuring the arrow on the element is in the OPPOSITE DIRECTION that the forward element was in.

The arrow should be pointing AWAY from the transmitter antenna cable. Read the value on the meter.)

10. Switch the wattmeter to REFLECTED power and measure. Record the reflected value in Attachment E {4} and compare with previous records. If reflected power is more than 4% of forward power, perform corrective action (some of the reflected power may be due to the 3-foot cables). If using the Bird 43 wattmeter, note the position of the arrow direction of the power element currently installed in the wattmeter (used to measure the forward power). Remove that element and replace it with a 50W element ensuring the arrow on the element is in the OPPOSITE DIRECTION that the forward element was in. The arrow should be pointing AWAY from the transmitter antenna cable.

On the WR300B or WR1000B broadcasting transmitter front panel, use the METER a.

FUNCTION up/down buttons to select RF POWER on the function indicator LEDs.

Observe and log the forward power. Use the Meter Function up/down buttons to select SWR AND ANTENNA SWR on the function indicator LEDs. Record the values in Attachment E {4}.

Set up and connect a laptop (with the CEC Interface Application installed) to the local serial b.

port of the RTC front panel. View, then record the values for forward and reverse power in Attachment E and compare with the front panel readings.

{5} Transmitter Exciter/Power Amplifier Supply Voltage and Current Verification Record the following measurements in Attachment E {5}.

1. On the transmitter front panel, press the METER FUNCTION up or down arrow switch until the

PA DC VOLTS green LED lights, then read and log the power amplifier voltage on the LED display.

2. Press the UP or DOWN arrow switch until the PA DC AMPS LED lights, then read and log the supply current on the LED display.

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3. Compare values recorded with previous results, like the Installation and Checkout (INCO) readings. If using a laptop, take a screen shot of the voltage, current, and temperature readings for the broadcasting transmitter. If the currents are incorrect, refer to the Continental Operation and Maintenance Manual for troubleshooting procedures.

{6} Transmitter Carrier Frequency Verification Using a communications analyzer with an antenna attached to the RF input connector, verify the carrier frequency is within ± 200Hz of the specified frequency (for the IFR 1200S: use the ANT input, set up according to Attachment D, set the FREQUENCY ERROR switch to RF-300, then perform Attachment D, Step 4). Record the carrier frequency reading in Attachment E {6}. If more than 500 Hz off assigned carrier frequency, the exciter needs to be adjusted using the CEC Interface Application. DO NOT proceed with this fine frequency adjustment without a full understanding of the adjustment procedure and a properly calibrated Communications Analyzer or Frequency Counter. Refer to Sections 5.7.3 [5.7.10 in older manuals] (Checking/Adjusting Operating Frequency Error) and 3.2.14 [3-2.11 in older manuals] (Transmitter A and B Calibration Screens) in the Continental Operation and Maintenance Technical Manual for a description of the adjustment procedures.

{7} Transmitter Voice Modulation and Deviation Level and Quality Verification

1. Connect a short antenna to the RF input connector of a communication analyzer. If using an

IFR 1200S analyzer, use the ANT input and set the METER selector to 6 kHz, VERTICAL selector to 2 kHz per div., HORIZONTAL selector to 1 ms per div. (or set to Tone if needed).

2. With a standard voice audio input from the CRS, check the modulation value on the meter and the deviation on the CRT. Verify that the nominal value is about ±4.5 kHz on the CRT and 4.5 kHz on the modulation meter and does not exceed ±5 kHz. There is a deviation adjustment on CEC Interface Application. If the level is excessive or clipping, first perform Procedure {8} to verify proper audio levels prior to adjusting the deviation or troubleshooting the transmitter.

Refer to the Continental Operation and Maintenance Manual Section 5.7.11. Record the readings in Attachment E {7}.

NOTE: Skip to Procedure {8}, Transmitter Audio Input Level Calibration and Verification, if Maintenance Functions {1} through {7} on both transmitters have been completed.

A.2.2 Repeat Maintenance for Backup (TXA or TXB) Transmitter

1. For the non-broadcasting transmitter, at the transmitter electrical panel box, turn ON the appropriate circuit breaker. Turn ON the power switch (CB1) on the back of the appropriate transmitter.

2. Switch to the other transmitter by pushing the Switch Transmitter switch on the RTC panel.

The other (Backup) transmitter should now begin to operate.

3. On the transmitter that had been broadcasting (TXA or TXB), turn OFF the power switch (CB1) on the back of the transmitter. Turn OFF the circuit breaker in the transmitter electrical panel box for the transmitter to be cleaned. Use standard Lock Out/Tag Out procedures to secure the breaker.

4. Repeat maintenance functions {1} through {7} for the backup transmitter.

{8} Transmitter Audio Input Level Calibration and Verification

1. On both transmitters (TXA and TXB), turn OFF the power switches (CB1) on the back of the transmitters.

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2. Locate the appropriate circuit breakers in the NWR transmitter electrical panel box, then switch the circuit breakers for both transmitters to the OFF position. Ensure all transmitters are OFF.

Use standard Lock Out/Tag Out procedures to secure the breakers.

3. Remove the external Power Meter from the cavity and install an external 1500W Dummy Load in place of the Antenna Transmission Line using the appropriate adapters and cables.

4. At the transmitter electrical panel box, turn ON the circuit breakers for both transmitters (TXA and TXB).

NOTE: The transmitter should still be in LOCAL control (R/L LED should be red).

CAUTION

During the following steps, warning alert tones are output from the transmitter. The broadcasting transmitter output MUST be connected to the dummy load instead of the Antenna so the warning tones are not sent out to the public.

{8}a Transmitter External Source Input Level Calibration

1. Set up the AM-48(XT) according to Attachment C (for baseline settings). If the AM-48 is not available, set up a sine wave frequency generator to input a 1000 Hz tone at 245 mV AC RMS, then skip to Step 8.

Set the ABS/REL/SEND switch to SEND.2.

3. Set the MF/DTMF/SHIFT key to SHIFT.

4. Press the A key, LEVL: 0.0 displays.

5. Using the keypad, enter 1 0 0 and press the D key (+/-). LEVL -10.0 displays.

6. Press the A key again. LEVL -10.0 displays.

7. Using the SEND….SEL switch (SW 6), push the switch until the SEND parameter shows 1004 near the bottom of the display. The AM-48 displays -10.0 1004.

8. Locate the audio surge suppressor (A2) located on the back of the Input/Output Panel Assembly (bottom panel) in the front of the transmitter cabinet (same area as the ROAMS and Dial Modem). Remove the top two screws to drop the panel down for access.

9. Remove the NWR audio feed coming from Telco or UHF link (usually at the TB1 terminal board). This is on the NETWORK (or LINE) side of the suppressor pins 1 and 2 and is typically the ORG/WHT (or Red and Black) pair.

10. Connect the RED and GREEN leads of the AM-48 (or similar signal source) to pins 1 and 2 of the NETWORK (or LINE) side of the suppressor. If not using the AM-48, skip to Step 14.

11. Set the 2W/4W/4W REV switch to 2W and the TERM/BRDG switch to BRDG.

12. Place the MON REC/MON SND/TALK switch to MON SND. The AM-48 should be sending a level of -10 dBm.

13. Change the ABS/REL/SEND switch from SEND to ABS. The display may change to a value of 9.1dBm or stay at -10dBm.

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14. Confirm the level at the telephone line (audio feed) surge suppressor using the AM-48 or a true RMS voltmeter. The level should be 245 mV AC or at least between 0.275 and 0.218 volts (-9.0 to -11 dBm).

NOTE: Some transmitters do not have a true 600 ohm input impedance; therefore, variations of actual levels occur. Levels from -9.0 to -11 dBm are acceptable. Because of this, the levels at the audio source may vary depending on the actual audio load of the transmitter.

15. AM-48(XT) only: If output does not seem correct, perform the following steps to verify the AM-48 is outputting the correct level:

Remove the GRN/RED AM-48 leads from the input to the transmitter. a.

On the AM-48, connect the GRN to YEL and the RED to BLK. This ties the TX and RX b.

together and loops the audio back into the AM-48.

Set TERM/BRIDGE to TERM. This supplies a calibrated 600 ohm load. c.

Set the following : d.

2W/4W/4W REV to 4W

ABS/REL/SEND to SEND

SEL….SEND section to 1004 The display should read 1004 -10.0. e.

Using the RMS multimeter, measure across the GRN/YEL and RED/BLK – it should read f.

245 mVAC RMS.

Further verification can be seen by changing the MON SND/MON REC/TALK to MON SND g.

and then MON RCV. The AM-48 indication will show -10.0 1004 in both positions. The indication shows the AM-48 is putting in the correct level for a TRUE 600 ohm input impedance.

If any settings were changed to verify the AM-48 output, restore the AM-48 to provide the h.

-10 dBm output into the transmitter.

Make sure that TXA and TXB are both connected to a dummy load (one is internal, the other is 16.

external - replacing the antenna).

Turn ON the power switches (CB1) for both TXA and TXB on the back of the transmitters. 17.

Make sure the transmitter is still in LOCAL control – the R/L LED on the RTC should glow red. 18.

If not red, press the REM/LOC button. Also, the LEDs above the DISABLE AUTO SELECT and VOX DISABLE should be glowing red.

Using a communications analyzer with an antenna on the input, measure and record (in 19.

Attachment E) the modulation on the digital display (4.5 kHz ± 0.5) for the transmitter connected to the external dummy load – (TXA or TXB). Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, perform transmitter alignment.

20. Turn OFF transmitters TXA and TXB by turning OFF the switches (CB1) on the back of the transmitters.

21. Disconnect the AM-48 from the suppressor and reconnect the NWR audio feed from the WFO.

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NOTE: Call the WFO to notify the appropriate personnel to prepare to perform the procedures in Attachment B.

{8}b 1050 Hz Warning Alert Tone Verification (sent from the WFO using the procedures in Attachment B, Part B.1)

1. If not already done, call the appropriate WFO to request that they send a PNS stating that the transmitter will be taken off the air for maintenance.

2. Set up the IFR 1200S (or 1200SS) Communication Monitor, using Attachment D.

3. Using clip leads, connect the AM-48 Test Set (refer to Attachment C for setup) or RMS Voltmeter in parallel to the transmitter telephone line audio input in the back of the cabinet to surge protector terminals 1 and 2 on the network side. Do not disconnect phone line from transmitter for the following verifications.

4. Make sure the broadcasting transmitter is connected to the Dummy Load and NOT to the Antenna. Turn ON the WR1000B (or WR300B) power switches (CB1) for transmitters TXA and

TXB.

5. Request that the WFO transmit the alert tone (they will use the procedures in Attachment B, Part B.1) from the CRS console for the purpose of verifying proper signal level on the audio program line and resulting modulation deviation. Ask the WFO if they have recently or will now measure the output of the appropriate Audio Switch Module (ASM) card (should be at a level of 0 dBm) .

6. At the audio input to the transmitter, measure the 1050 Hz warning alert tone level using an RMS AC voltmeter or AM-48. Record the level in Attachment E {8}. If it is not within the specified range of -9 to -12 dBm (0.275 to 0.195 Vrms), request that a technician at the WFO check for 0 dB at the ASM card output jack (refer to the CRS Maintenance Manual, Appendix H, CRS System Alignment Procedures, Section H-5.1). If the ASM card output level is correct and the level of -9 to -12 dBm still cannot be obtained, check the phone line or perform transmitter troubleshooting procedures. Notify the appropriate NWS personnel.

7. Using a communications analyzer with an antenna on the input, measure the modulation on the digital display (4.5 kHz ± 0.5) for the transmitter connected to the external dummy load (TXA or TXB) and record in Attachment E {8}. Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, perform transmitter troubleshooting.

{8}c NWRSAME Level Verification (sent from the WFO using the procedures in Attachment B, Part B.2, and generated from SAME hardware panel)

1. If not already performed, repeat Section 8{b} 1050 Hz Warning Alert Tone Verification (sent from the WFO using the procedures in Attachment B, Steps 1 through 4).

2. Request the WFO to generate the NWRSAME signal from the SAME hardware panel (they will use the procedures in Attachment B, Part B.2).

3. At the audio input to the transmitter, measure and record in Attachment E {8} the SAME Preamble level using an RMS AC voltmeter (or AM-48). If it is not within the specified range of -

14.5 dBm ± 0.5 dBm (0.146 ± 0.008), the NWR end-to-end alignment procedures must be performed. Notify the appropriate NWS personnel.

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4. Using a communications analyzer with an antenna on the input, measure the modulation on the digital display (4.5 kHz ± 0.5) for the transmitter connected to the external dummy load (TXA or TXB) and record in Attachment E {8}. Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, perform transmitter troubleshooting.

{8}d NWRSAME and Alert Tone level verification (sent from the WFO using the procedures in Attachment B, Part B.3, and generated from CRS console)

1. If not already performed, repeat Section 8{b} 1050 Hz Warning Alert Tone Verification (sent from the WFO using the procedures in Attachment B, Part B.1, Steps 1 through 4).

2. Request the WFO to generate the NWRSAME signal from the CRS console (they will use the procedures in Attachment B, Part B.3).

3. At the audio input to the transmitter, measure the SAME Preamble level using an RMS AC voltmeter (or AM-48) and record in Attachment E {8}. If it is not within the specified range of -14.5 dBm ± 0.5 dBm (0.146 ± 0.008), the NWR end-to-end alignment procedures must be performed. Notify the appropriate NWS personnel.

4. Using a communications analyzer with an antenna on the input, measure the modulation on the digital display (4.5 kHz ± 0.5) for the transmitter connected to the external dummy load (TXA or TXB) and record in Attachment E {8}. Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, perform transmitter troubleshooting.

5. If both transmitters have been completed, turn OFF the switches (CB1) on the back of transmitters TXA and TXB, disconnect the AM-48 (or AC Voltmeter) from the back of the telephone input terminals, then go to Part A.2.3. Otherwise, proceed to the next step.

6. Switch to the other transmitter (if applicable) by pushing the Switch Transmitter switch on the RTC front panel. The other transmitter should now be connected to the external dummy load (that replaced the antenna).

7. Go back to Procedure {8}a to repeat audio input level verifications for the other transmitter (also repeat Procedures {8}b, {8}c, {8}d).

A.2.3 Returning Transmitter(s) Back to Remote Control Operation

1. On both the TXA and TXB transmitters, make sure the transmitter power switches (CB1) have been turned OFF.

2. Locate the appropriate circuit breakers in the NWR transmitter electrical panel box, then switch all the circuit breakers for transmitters TXA and TXB to the OFF position. Ensure all transmitters are OFF.

3. Remove the external Dummy Load and any adapters and cables, then carefully re-install the Antenna Transmission Line.

4. Turn ON the transmitter TXA and TXB electrical panel box circuit breakers. Turn ON the power switches at the back of the exciter/power amps.

5. On the RTC panel, push in the DISABLE AUTO SELECT and VOX DISABLE switches (all the LEDs that were red should be off).

6. Transfer back to…