Attachment_1E3_Armstrong_Preventive_Maintenance_version_1.2.pdf

ENGINEERING HANDBOOK 7 SECTION 4.4

Armstrong Maintenance Schedule EHB-7 7/27/16

COMMUNICATIONS EQUIPMENT MAINTENANCE SCHEDULE - ARMSTRONG

TRANSMITTERS

Office of Dissemination

W/DISS: CH

SUBJECT: NWR Armstrong Transmitter, Versions A and B, Preventive Maintenance Schedule and Performance Measurements

PURPOSE: To provide periodic monitoring, maintenance, and performance measurements for the NWR Armstrong 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 Armstrong model NWR Transmitter Sites

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

VERIFICATION

STATEMENT:

The procedures were tested at Orlando, FL, for the G1000 and at NWS Headquarters for the G1000B.

ESTIMATED COMPLETION

DATE:

Monthly: Remote maintenance

Every 12 months: On-site Maintenance - performed by the National Maintenance Contractor; performed by 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 (9-13 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: 2.5 hours Annual field strength measurements: 8 hours

ACCOMPLISHED BY: NWS and/or contractor electronics technicians

EQUIPMENT AFFECTED: Armstrong model G100/G300/G1000 (B254/B252/B250) and G300B/G1000B (B253/B251) transmitters

SPARES AFFECTED: None

EHB-7 Armstrong Maintenance Schedule 7/27/16 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) 427-9696 (Ron.DeWaters@noaa.gov)

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 Hz and 1-volt AC root-mean-square (RMS) output]

• Portable Computer with the Armstrong “Telecon” Control and Monitoring Software (installed and configured).

• 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 (Watt) 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

3 7/27/16

• RS-232 cable with 9-pin female to 9-pin male connectors, 4 to 6 feet (not Null Modem)

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

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

• Telephone buttset with RJ-11 modular adapter available

• Vacuum cleaner

• Tool Kit (including a 12-inch Crescent wrench, #1 and #2

Phillips screwdriver, 3/8-inch nut driver)

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

#191-470) DOCUMENTS AFFECTED: This schedule supersedes the previous NOAA Weather

Radio (NWR) Armstrong Transmitter Preventive Maintenance Schedule and Performance Measurements, dated 2/8/2006.

• Armstrong Operation and Maintenance Manual, N.O.A.A.

Weather Radio G100, G300, G1000 Dual Redundant Transmitter Systems (Copyright 2003, REV 2, 06/15/2003)

• Armstrong Operation and Maintenance Manual, NWR- G300B, NWR-G1000B (Copyright 2010, REV 1, 6/25/2010)

• 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 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 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 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 https://www.ops1.nws.noaa.gov/Secure/CRS/NWR_EGS_ATS_Maint_Schedule-1_signed.pdf

7/27/16 4

PROCEDURE: Perform maintenance as specified in the following attachments:

ATTACHMENT A - Armstrong Transmitter Site Preventive Maintenance Procedures

Part 1 - Preventive Maintenance Table and General Maintenance Procedures

Part 2 - Preventive Maintenance Procedures for Armstrong Model G100/G300/G1000 and G300B/G1000B Transmitters

ATTACHMENT B - Providing Audio Test Signals to 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 - Confirming Transmitter Transfer using ACP and CRS Application

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

ATTACHMENT D - IFR 1200 Communications Monitor to Display Modulation and Deviation

ATTACHMENT E - Armstrong Transmitter Maintenance Record and Measurement Form

TECHNICAL ASSISTANCE: Maint. Program Engineer: Jeffrey.Earl@noaa.gov (301) 427-9199

Senior Technician: Craig.Williams@noaa.gov (301) 427-9677

Senior Technician: Greg.Sikora@noaa.gov (301) 427-9192 mailto:Jeffrey.Earl@noaa.gov mailto:Craig.Williams@noaa.gov mailto:Greg.Sikora@noaa.gov

5 7/27/16

REPORTING

INSTRUCTIONS:

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

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

Include the following information on the EMRS report:

Station ID (block 6): XXXXX (SID)

Equipment Code (block 7): BXXX (see Table 1)

Serial Number (block 8): unit serial number

Table 1: NWR Transmitter Equipment Codes

Thomas J. Day Chief, Services Branch

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

Equipment Type Code Dual NWR 1000W Transmitter (Armstrong Model G1000) B250 Dual NWR 300W Transmitter (Armstrong Model G300) B252 Dual NWR 100W Transmitter (Armstrong Model G100) B254 Dual NWR 1000W Transmitter (Armstrong Model G1000B) B251 Dual NWR 300W Transmitter (Armstrong Model G300B) B253 https://www.ops1.nws.noaa.gov/NWRreporting

A-1 7/27/16

ATTACHMENT A ARMSTRONG TRANSMITTER SITE PREVENTIVE MAINTENANCE

PROCEDURES

A.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 Armstrong transmitters use ROAMS (Remote Off Air Monitoring System) and Armstrong “Telecon” Control and Monitoring Software.

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 Armstrong NWR Transmitters

ALL FOLLOWING MONITORING CHECKS TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Overview Remarks

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

Install, set up, and start the Armstrong Telecon Control and Monitoring Software, 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 Armstrong control and monitoring software (Armstrong Operation and Maintenance Manual, Section 6 and Section 3.10 for original and “B” version transmitters; Section 2.5 and Section 3.4 in the old manual original transmitter).

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: TX1 (or TXA) for odd years, TX2 (or TXB) for even years

Reference procedure to transfer as necessary.

Transmitter TX1 (or TXA) should be broadcasting during odd years (e.g., 2015-TX1) and transmitter TX2 (or TXB) should be broadcasting during even years (e.g., 2016-TX2).

7/27/16 A-2

ALL FOLLOWING MONITORING CHECKS TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Overview Remarks

{D} Disconnect from Transmitter and Save Files

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

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

A-3 7/27/16

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

1. In order to remotely connect to the Armstrong Transmitter, the LOCAL/REMOTE switch on the NWR-IP1B Interface Panel MUST be in the REMOTE position (before leaving the transmitter site). The NWR-IP1B Interface Panel in the GSet section will display Modem next to Interface.

2. If the Armstrong “Telecon” Control and Monitoring Software is installed on a laptop computer and the REMOTE.MDB preset configurations are completed, skip to Step 9.

If not previously installed on a PC, download, install and set up the Armstrong Telecon Control and Monitoring Software application (see Step 3 through Step 8).

NOTE: Refer to the Armstrong Operation and Maintenance Manual, Section 6, for detailed information on installing and using the application, with Section 6.5 specifically for Remote Control setup.

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

4. Log in for access using your username and password.

5. Go to the Armstrong heading and under the “G100/G300/G1000” or “G300B/G1000B” sections, click on Telecon 32 Bit Release <xxxxxxxx>, ver <x.xx.x> and download the remote application.

6. Double-click on the Armstrong_Telecon_Software.zip file to extract the archived files and install the program and drivers to the laptop.

7. If necessary, set up the laptop internal modem or USB modem for the appropriate dial-up parameters.

8. Edit the REMOTE.MDB configurations with the following procedure:

Select REMOTE.MDB from the Database window drop-down menu. a.

Preset configurations will appear for the five models of Armstrong transmitters. Select the b.

model transmitter to connect to and press the Edit Phonebook button.

To enter a new site, press the New Entry button. c.

Enter a unique name to identify the site. Press OK. d.

Enter all the information for the site selected, e.g., Telephone Number (<site phone e.

number>), Dial String (ATDT), Modem String (ATX3), Comm Protocol (Standard), Com (<appropriate COM port>), Baud (19200), Type (Modem), and Station Name (NWRK1 for G100, NWRK3 for G300, NWRK3B for G300B, NWR1K for G1000, NWR1KB for G1000B). When finished, press Return.

9. With a modem connected to an outside dial line, start the Armstrong Telecon application on the laptop by double-clicking on the Telecon icon (unless already minimized).

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

7/27/16 A-4

10. Leave the Armstrong Telecon application window on the desktop and proceed to the next step.

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

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

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

14. 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.

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

16. 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.

17. 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.

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

19. Proceed immediately to the Armstrong Telecon application on the laptop.

20. Select the appropriate transmitter from the REMOTE.MDB menu, then click on Start Connection to dial into the appropriate site transmitter.

21. After 30 to 45 seconds, the Connection window will display all the operational parameters for the transmitter. At the top and middle of the screen, it should show TX1 (or TX2) ON AIR.

Proceed to Section {2} to verify and record the operating parameters.

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

23. If any connection failures or anomalies occur, contact the NWS Headquarters NWR Engineer at

(301) 427-9696.

{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 for TX1 or TX2, depending on which is currently transmitting. Make sure the Exciter/Power Amplifier Currents, Supply Voltages, Transmitter Forward and Reflected Power, and Antenna VSWR are within the normal operating range.

2. Record the operating parameters and compare with previous parameters to verify proper operation.

A-5 7/27/16

{C} Ensure Appropriate Transmitter is Broadcasting

Check that the appropriate transmitter is broadcasting based on the current year by checking the ON AIR window.

Transmitter TX1 should broadcast during odd years (e.g., 2015-TX1); transmitter TX2 should broadcast during even years (e.g., 2016-TX2). If not, perform the following:

1. Move the cursor to the Switch To TX2 (or TX1) command button, then press Enter.

2. Press Send Command on the dropdown menu to initiate the transmitter transfer to the appropriate transmitter according to the year:

TX1 for odd years

TX2 for even years

{D} Disconnect From Transmitter

1. Click the red Exit button, then click OK when the Exit Program window pops up to close the connection, then click Exit at the bottom right of the Telecon screen to close the application.

2. Enter the appropriate parameters in the EMRS A-26 page and send to the appropriate NWR site point of contact.

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 the maintenance procedures listed 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 Armstrong Transmitter Maintenance Record and Measurement Form (Attachment E) should be completed as the maintenance functions are performed.

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 24 to 48 hours prior to the scheduled transmitter preventive maintenance visit (or prior to a corrective maintenance visit where routine maintenance is also performed), the WFO Electronics 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 ACP; SAME tone

7/27/16 A-6 generated by the NWRSAME Panel; and the Alert, Transfer, and SAME tones generated by the CRS Application/DECtalk Card.

At least 24 hours prior to the start of on-site transmitter maintenance, the transmitter technician 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, Part 1 through Part 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 2.

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

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.

A-7 7/27/16

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

{3} Check Alternate Current (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 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.

7/27/16 A-8

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

At least 24 to 48 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 Audio Control Panel and CRS console software application; WFO to execute final transfer to odd year (e.g., 2015-TX1) or even year (e.g., 2016-TX2) transmitter

ROAMS still disabled when switching transmitters.

See following 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.

A-9 7/27/16

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.

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

ALL FOLLOWING 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.

Time interval: 9 to 13 months

Normally performed by NWS technicians or Regional Maintenance Specialists (RMS).

7/27/16 A-10

A.2 Preventive Maintenance Procedures for Armstrong Model G100/G300/G1000 and G300B/G1000B Transmitters

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

NOTE: At least 24 hours prior to the start of on-site transmitter maintenance, the transmitter technician 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 (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 (see 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 NWR Interface Panel, move the toggle switch DOWN to the LOCAL position (the green Remote LED goes out).

5. For the G100/G300/G1000 only: On the NWR-MC1 System Controller Panel, rotate the knob on the System Controller until Gset is highlighted on the display, then push in the knob. Rotate the knob until the selection next to Interface is highlighted, then push in the knob until it reads Local. The right side of the display reads, Are You Sure? Rotate the knob to select Yes, then push in the knob. Rotate the knob until the selection next to the Control is highlighted, then push in the knob until it displays Manual. Rotate the knob to highlight Yes, and then push in the knob to select. Rotate knob to Exit at the bottom of the display and push in the knob. The amber Local LED should be on (the green Auto LED is off) on the System Controller Panel.

6. For the G300B/G1000B only: While Gset is highlighted, make sure the System Controller Panel displays Interface: Local and Control: Manual. If Control is still in Auto, highlight the Main menu, push in the control knob and rotate the knob until the circular arrows icon is highlighted.

Push in knob. When the right side of the screen asks, Are You Sure?, select Yes and push in the knob. A large X should appear over the circular arrows. The amber Local LED should be on (the green Auto LED is off) on the System Controller Panel.

7. Verify the non-broadcasting transmitter is OFF (standby). On the NWR-MC1 System Controller Panel, rotate the round knob to the right of the LCD display until Main is highlighted, then push in the knob.

A-11 7/27/16

8. For the G100/G300/G1000 only: While in the Main menu, rotate the knob until the black arrow points to the non-broadcasting transmitter (TX1 or TX2) then push in the knob. Observe the status under TX2 (or TX1) which should display TX OFF. If not, rotate the knob until TX ON is highlighted, then push in the knob until it shows TX OFF.

9. For the G300/G1000B only: While in the Main menu, rotate the controller knob until the white arrow points to the non-broadcasting transmitter (TX1 or TX2). Observe the status of TX1 or TX2. The non-broadcasting transmitter should be dark (not backlit). If the transmitter is on, push in the knob. The right side of the display will ask, Are You Sure? Rotate the knob to Yes and push in to initiate the OFF command.

10. A laptop with the Armstrong Control and Monitoring Software “Telecon” installed can be connected now (or later as described at the end of Procedure {4}) to the NWR Interface Panel RS-232 port or USB port using the appropriate cable. Refer to Section 6 and Section 3.10 of the Armstrong Operation and Maintenance Manual (latest revisions) for software installation and interfacing.

11. For a 1000 or 300W dual transmitter system, on the non-broadcasting transmitter, turn OFF the power switches to the FM-500LCD RF Amplifiers (G300/G1000 only) or the NWR- TX300/TX1000 Panel (G300B/G1000B). Also on the non-broadcasting transmitter, turn OFF the FMX-80 Exciter power switch (G100/G300/G1000 only).

12. Locate the appropriate circuit breaker in the NWR transmitter main electrical panel box, and 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.

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

(Refer to Section 5.3 in the Armstrong Operation 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 lint-less cloth moistened with rubbing alcohol.

Dry with a clean, dry, lint-less cloth.

2. There are two filters for each of the FM-500LCD RF power amplifier panels and two for the Power Combiner and Splitter panel (there is no filter in the FMX-80 Exciter). On the G1000B, there is one filter for each of the NWR-TX1000 Transmitters (there is no power combiner). Use a small Phillips screwdriver to remove the four screws holding each of the air filter covers.

Vacuum the filters and both sides of the filter cover and panel. If unable to clean properly, replace the filters. Replacement filters are available from the National Maintenance Contractor using the following part numbers:

• For Model G100/G300: AR-FLTR-NWR-G300

• For Model G1000: AR-FLTR-NWR-G1000

• For Model G300B: WRFM0100

• For Model G1000B: WRFM0100

7/27/16 A-12

3. Re-install the air filters and covers.

4. If in an extremely dirty environment, for the non-broadcasting transmitter, turn off the FM- 500LCD RF Amplifiers (G300/G1000 only) or NWR-TX300/TX1000 Panel (G300B/G1000B) and FMX-80 Exciter power switch (G100/G300/G1000 only). Turn off the circuit breakers for both transmitters. Disconnect any cables from the back of the chassis, pull out the chassis from the rack, and remove the top cover plate. Use dry and oil-free compressed air, a soft bristle brush, and the vacuum to remove any dust that accumulates on 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)

1. Check for signs of burned or broken components/assemblies and loose or damaged cables.

2. Make sure all the cooling fans (both front and back) of the broadcasting transmitter are operating properly and not abnormally noisy. 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.

1. Check the AC input voltage by using a multi-meter to measure at the bottom terminals in the back of the cabinet. Remove the rear cabinet cover and measure voltage at Mains TX1 and Mains TX2. Depending on the transmitter model and type of power supplied, the input voltage should be 115 VAC ±10%, 208 VAC ±10% (three-phase), or 230 VAC ±10% (single-phase).

Contact the site line power point of contact if outside the ±10% range.

2. Check the indicator lights on the AC surge protectors to ensure they are still properly protecting the power line (two green LEDs are on). Replace the protector as necessary. Check the LEDs and LCD displays of the broadcasting transmitter. Record all information in Attachment E {3}.

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3. Check the battery date code written on the outside of the ROAMS chassis (if no date was written on the outside of chassis, the battery must be removed from the 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 {3}. 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.

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

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

1. Ensure the transmitter is under MANUAL control. Turn off the broadcasting transmitter prior to attaching an external power meter: On the NWR-MC1 System Controller Panel, rotate the round knob until Main is highlighted, then push in the knob.

For the G100/G300/G1000 only: While in the Main menu, rotate the controller knob until a.

the black arrow points to the broadcasting transmitter (TX1 or TX2), then push in the knob.

Observe the status under TX1 (or TX2). Rotate the knob until TX ON is highlighted, then push in the knob until it displays TX OFF. The screen will ask Are You Sure? Rotate the knob to select Yes, and then push in the knob. The transmitter should now be OFF.

For the G300/G1000B only: While in the Main menu, rotate the controller knob until the b.

white arrow points to the broadcasting transmitter (TX1 or TX2) which will be highlighted/backlit. Push in the controller knob. The right side of the display will ask, Are You Sure? Rotate the knob to Yes and push in to initiate the OFF command. The transmitter that had been broadcasting should now be dark (not backlit) indicating it is OFF.

2. For a 1000 or 300W dual transmitter system, on the broadcasting transmitter, turn OFF the power switches to all the FM-500LCD RF Power Amplifiers (G300/G1000) or NWR- TX300/TX1000 Panel (G300B/G1000B). Also on the broadcasting transmitter, turn OFF the FMX-80 Exciter power switch (G100/G300/G1000 only).

3. Locate the appropriate circuit breaker in the NWR transmitter electrical panel box, and then switch the circuit breaker for the transmitter 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 Step 5.

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 a calibrated external power meter, directional coupler, or power sensor (use appropriate element for a Bird 43: 100W element for G100; 500W element for G300/G300B; or 1000W element for G1000/G1000B) between the cavity output connector and the antenna cable. (A 7-16 DIN to Type N adapter may have to be used, with a 25-inch LMR-400 Type N cable to prevent the heliax from bending. The proper cable length is necessary to maintain antenna cable phasing.)

6. Switch the circuit breaker for the transmitter that had been broadcasting to the ON position.

7. On the transmitter that had been broadcasting, turn ON the FMX-80 Exciter power switch (G100/G300/G1000 only). For a 1000 or 300W dual transmitter system, on the transmitter that had been broadcasting, turn ON the power switches to the FM-500LCD RF Amplifiers (G300/G1000 only) or NWR-TX300/TX1000 Panel (G300B/G1000B).

8. On the System Controller Panel, rotate the round knob until Main is highlighted. Push in the knob.

For the G100/G300/G1000 only: While in the Main menu, rotate the controller knob until a.

the black arrow points to the transmitter that had been broadcasting (TX1 or TX2), then push in the knob. Observe the status under TX1 (or TX2). Rotate the knob until TX OFF is highlighted, then push in the knob until it displays TX ON. The screen will ask Are You Sure? Rotate the knob to select Yes, and then push in the knob. The transmitter should now be ON.

For the G300/G1000B only: While in the Main menu, rotate the controller knob until the b.

white arrow points to the transmitter that had been broadcasting (TX1 or TX2) which should be dark (not backlit). Push in the controller knob. The right side of the display will ask, Are You Sure? Rotate the knob to Yes and push in to initiate the ON command. The transmitter that had been broadcasting should now be highlighted/backlit, indicating it is

ON.

NOTE: If the transmitter does not come on, turn the transmitter OFF then ON again by pushing in the knob to energize the RF Power Amplifiers. Observe the status on the LCD display.

9. Record the forward and reflected power value from the external power meter in Attachment E {4} and compare with previous readings. The Armstrong Telecon application System Forward Power reading should be within 5% of the external wattmeter reading.

(Reflected power measurement setup 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.)

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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.

11. Armstrong Exciter (front) Panel measurements and adjustments:

For the G100/G300/G1000: Observe the Fwd Pwr and Rfl Pwr on the Power Combiner a.

and Splitter LCD display and on the RF power amplifier displays (if applicable). If necessary, use a small screwdriver to adjust the RF Gain pot to the proper levels on the RF Power Amplifier Panel and the Power Adjust on the Exciter Panel (to adjust, see Section 3.3, Figure 3-1 and Figure 3-2, in the Armstrong manual).

For the G300B/G1000B: On the menu, press ESC, and then press the right angle arrows b.

until PWR is highlighted. Press ENTER button and observe the Fwd and Rfl power. If it is necessary to adjust power, see the G300B/G1000B manual, Section 3, page 3-3.

12. Record the final forward and reflected power values in Attachment E {4} (and the site log).

13. In order to use the Armstrong Control and Monitoring Software, refer to the following Armstrong Operation and Maintenance Manuals: G100/G300/G1000 REV1 Manual. Refer to Sections 2.5 and 3.4 to set up and connect a laptop to the local serial interface port of the NWR Interface Panel; figures 3-11, 3-12, and 3-13 show examples of the computer display when monitoring the transmitter. G100/G300/G1000 REV2 and G300B/G1000B REV1 Manuals: Refer to Section 6 and Section 3.10 for software installation and interfacing to the RS232 (and USB) local interface port.

14. Record the values for forward and reverse power from the laptop in Attachment E {4} and compare with the front panel reading.

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

1. Armstrong Exciter (front) Panel measurements:

For the G100/G300/G1000: On each front panel, push the blue ESC buttons to light the a.

display. Use the blue arrow buttons to highlight P.A. on the display. Press Enter to show the voltage and currents on the panel for the Power Amps and Combiner & Splitter panels.

Note the PA voltage and current.

For the G300B/G1000B: Press the right angle arrows button until PA is shown, then press b.

Enter. Note the PA voltage and current.

2. Record in Attachment E {5}. In addition, record the laptop readings in Attachment E {5} and compare with the front panel readings.

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{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, setup according to Attachment D, set the FREQUENCY ERROR switch to RF-300, then perform Attachment D, Step 4). Record the initial carrier frequency reading in Attachment E {6}. If more than 500 Hz off assigned carrier frequency, refer to the following procedures to adjust the frequency:

(Refer to Section 5.5.2, Fine Frequency Adjustment of the Armstrong Operation Manual for the G100/G300/G1000, and the G300B/G1000B.)

Fine adjustment of the exciter operating frequency can be accomplished by accessing the left side of the exciter. DO NOT proceed with this adjustment without a properly calibrated Communications Analyzer or Frequency Counter. Use the following procedure:

1. Unscrew the four screws holding the front of the exciter to the rack.

2. Pull the exciter out approximately 5 inches to access the adjustment hole on the left side of the exciter. The adjustment potentiometer is VERY delicate. Excessive force will damage the oscillator and render the exciter inoperative.

3. Gently insert a trimpot adjustment tool into the slot and slowly turn the pot. Approximately 1/16 of a turn will change the frequency approximately 500 Hz.

4. Record the final carrier frequency reading in Attachment E {6}.

{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 approximately ± 4.5 kHz on the CRT and 4.5 kHz on the modulation meter and does not exceed ± 5 kHz. If it is excessive or clipping, first perform Procedure {8} to verify proper audio levels prior to troubleshooting the transmitter. (To adjust the modulation deviation level, refer to Section 3.4 for the G100/G300/G1000 and to Section 3.4 for the G300B/G1000B in the Armstrong Maintenance Manual). Record the readings in Attachment E {7}.

NOTE: Skip to Procedure {8}, Transmitter Audio Input Level Calibration and Verification, if maintenance on both transmitters has been completed.

A.2.2 Repeat Maintenance for Backup Transmitter

1. For the non-broadcasting transmitter, at the transmitter electrical panel box, turn ON the appropriate circuit breaker.

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2. On the non-broadcasting transmitter, turn ON the FMX-80 Exciter power switch (G100/G300/G1000 only). For a 1000 or 300W dual transmitter system, on the non-broadcasting transmitter, turn ON the power switches to the FM-500LCD RF Amplifiers (G300/G1000 only) or NWR-TX300/TX1000 Panel (G300B/G1000B).

3. On the NWR-MC1(B) System Controller Panel, rotate the round knob until Main is highlighted.

Push in the knob.

For the G100/G300/G1000 only: While in the Main menu, rotate the controller knob until a.

the black arrow points to the coax switch (below the antenna icon). Push in the knob. The screen reads, Are You Sure? Push in knob to select Yes. The switching operation takes approximately 15 seconds and completes when the hourglass disappears. The display and LEDs to the left of the screen will indicate which transmitter is on antenna and which is on internal dummy load. The other (backup) transmitter should now begin to broadcast and the previously broadcasting transmitter is in standby. Verify the previously broadcasting transmitter is OFF (standby). To further verify, rotate the round knob to the right of the LCD display until Main is highlighted, then push in the knob. Rotate the knob until the black arrow points to the previously broadcasting transmitter (TX1 or TX2), then push in the knob.

Observe the status under TX1 (or TX2), which should display TX OFF. If not, rotate the knob until TX ON is highlighted, push in the knob until it shows TX OFF.

For the G300/G1000B only: While in the Main menu, rotate the controller knob until the b.

white arrow points to the coax switch (below the antenna icon). Push in the knob. The screen reads, Are You Sure? Push in knob to select Yes. The switching operation takes approximately15 seconds and completes when the hourglass disappears. The display and LEDs to the left of the screen will indicate which transmitter is on antenna and which is on internal dummy load. The other (backup) transmitter should now begin to broadcast and the previously broadcasting transmitter is in standby. Verify the previously broadcasting transmitter is OFF (standby). While in the Main menu, rotate the controller knob until the white arrow points to the transmitter that was broadcasting (TX1 or TX2) which should be dark (not backlit). The transmitter that was not broadcasting should now be highlighted/backlit, indicating it is ON.

4. For a 1000 or 300W dual transmitter system on the transmitter that had been broadcasting, turn OFF the power switches to the FM-500LCD RF Amplifiers (G300/G1000 only) or NWR- TX300/TX1000 Panel (G300B/G1000B). On the transmitter that had been broadcasting, turn OFF the FMX-80 Exciter power switch (G100/G300/G1000 only).

5. Locate the appropriate circuit breaker in the NWR transmitter main electrical panel box, and 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.

6. Repeat maintenance functions starting from {1} through {7} for the backup transmitter.

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{8} Transmitter Audio Input Level Calibration and Verification

1. Turn off the broadcasting transmitter (and backup if applicable) prior to removing the external power meter and attaching an external dummy load: On the NWR-MC1 System Controller Panel, rotate the round knob until Main is highlighted, then push in the knob.

For the G100/G300/G1000 only: While in the Main menu, rotate the controller knob until a.

the black arrow points to the broadcasting transmitter (TX1 or TX2), then push in the knob.

Observe the status under TX1 (or TX2). Rotate the knob until TX ON is highlighted, then push in the knob until it displays TX OFF. The screen will ask Are You Sure? Rotate the knob to select Yes, and then push in the knob. The transmitter should now be OFF.

For the G300/G1000B only: While in the Main menu, rotate the controller knob until the b.

white arrow points to the broadcasting transmitter (TX1 or TX2) which will be highlighted/backlit. Push in the controller knob. The right side of the display will ask, Are You Sure? Rotate the knob to Yes and push in to initiate the OFF command. The transmitter that had been broadcasting should now be dark (not backlit), indicating it is

OFF.

2. For a 1000 or 300W dual transmitter system, on the broadcasting transmitter, turn OFF the power switches to all the FM-500LCD RF Power Amplifiers (G300/G1000) or NWR- TX300/TX1000 Panel (G300B/G1000B). Also on the broadcasting transmitter, turn OFF the FMX-80 Exciter power switch (G100/G300/G1000 only).

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

OFF.

4. 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.

5. On the primary and backup (if applicable) transmitters, turn ON the transmitter circuit breaker panel switches in the electrical panel box.

6. Turn ON all the FMX-80 Exciter power switches (G100/G300/G1000 only). For a 1000 or 300W dual transmitter system, turn ON all the power switches to the FM-500LCD RF Amplifiers (G300/G1000) or NWR-TX300/TX1000 Panel (G300B/G1000B).

NOTE: The transmitter should still be in LOCAL control. Refer back to Section A.2.1 to verify.

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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.

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

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.