Attachment_1E2_Crown_Preventive_Maintenance_Version_1.1.pdf

Attachment 1E2 Version 1.1 SECTION 4.4

Crown Maintenance Schedule EHB-7 4/22/11

NWR Crown Transmitter Preventive Maintenance Schedule and Performance Measurements (Crown models WR-100, WR-300, WR-1000)

Maintenance, Logistics, and Acquisition Division

W/OPS12: JJE

SUBJECT: NOAA Weather Radio (NWR) Crown Transmitter Preventive Maintenance Schedule and Performance Measurements

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

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

VERIFICATION

STATEMENT:

The procedures were tested at _________________________ (300 Watt dual)

ESTIMATED COMPLETION

DATE:

• Monthly: Remote maintenance

• Semi-annually (option to shorten interval for dusty/dirty sites):

On-site maintenance

• Annually (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: Crown model WR-100/WR-300/WR-1000 transmitters (B244/B242/B240)

SPARES AFFECTED: None

PARTS/MATERIALS

REQUIRED:

Air filters (if required)

SOURCE OF

PARTS/MATERIALS:

National Maintenance Contractor

(Contact NWS headquarters either by phone or email for the Contractor information.)

Ron DeWaters: Ron.DeWaters@noaa.gov 301-713-1847 x173

Ron Vaillant: Ron.Vaillant@noaa.gov 301-713-1847 x189

DISPOSITION OF

REMOVED

PARTS/MATERIALS:

Not applicable.

SECTION 4.4 Version 1.1 ENGINEERING HANDBOOK 7

EHB-7 Crown Maintenance Schedule 4/22/11 2

TOOLS AND TEST

EQUIPMENT REQUIRED:

• Communications Analyzer (e.g., IFR FM/AM 1200S/SS Comms Monitor with tracking function (option 12) or equivalent)

• Ameritec AM-48(XT) Transmission Line Test Set (or equivalent)

• Laptop or Notebook computer with the Burk Technology (Lynx) Remote Control Software (Ver. 5.0) installed and configured

• Digital Multimeter

• 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, 500W, 1000W, 2500W elements or Bird 5000-XT and 5014)

• 1500 Watt Dummy Load

• Signal Strength Meter or Signal Strength Measurement System

• Telephone buttset with RJ-11 modular adapter available

• Two 3' Type N male to N male RG142B/U cables (Pasternack

PE3455-36)

• One 6' Type N male to N male RG142B/U cable (Pasternack

PE3455-72)

• 25” (end to end) DIN female to N male LMR-400 adapter cable

• 25” (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-inch DIN male to N female adapter (Pasternack PE9179)

• 7/16-inch 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’ BNC cables with BNC male on each end

• (Optional) BNC cable, approx 6’, BNC male one end, alligator clips on other end (if using AM-48) and BNC Tee

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

• 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” nut driver)

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

SECTION 4.4 DRAFT ENGINEERING HANDBOOK 7

3 4/22/11

DOCUMENTS AFFECTED: None.

PROCEDURE: Perform maintenance as specified in the following attachments:

ATTACHMENT A - Crown Transmitter Site Preventive Maintenance Procedures

Part 1 - Preventive Maintenance Table for Crown Transmitters

Part 2 - Preventive Maintenance Procedures for Crown Model WR-100/WR-300/WR-1000 Transmitters

ATTACHMENT B - WFO Procedures to Provide Audio Test Signals to the Transmitter

Part 1 - Procedure to Generate the 1050 Hz Alert Tone Using the CRS Audio Control Panel (ACP)

Part 2 - Procedure to Generate SAME Burst Tones from the NWRSAME Hardware Panel

Part 3 - Procedure to Generate SAME Burst Tones from the CRS Console

Part 4 - Procedure to Confirm Transmitter Transfer using Audio Control Panel and CRS Console

ATTACHMENT C - Set-up for AM-48 Transmission Line Test Set

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

ATTACHMENT E - Crown Transmitter Maintenance Record and Measurement Form

TECHNICAL ASSISTANCE: Jeffrey Earl: Jeffrey.Earl@noaa.gov 301-713-1833 x162

Greg Sikora: Greg.Sikora@noaa.gov 301-713-1833 x187

Ron DeWaters: Ron.DeWaters@noaa.gov 301-713-1847 x173

4/22/11 4

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/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

EQUIPMENT TYPE EQUIPMENT CODE

Dual NWR 1000 Watt Transmitter (Crown) B240 Dual NWR 300 Watt Transmitter (Crown) B242 Dual NWR 100 Watt Transmitter (Crown) B244

Mark S. Paese Director, Maintenance, Logistics, and Acquisition Division

Attachment A - Crown Transmitter Site Preventive Maintenance Procedures Attachment B - WFO Procedures to Provide Audio Test Signals to the Transmitter Attachment C - Set-up for AM-48 Transmission Line Test Set Attachment D - Set-up for IFR 1200 Communications Monitor to Display Modulation and Deviation Attachment E - Crown Transmitter Maintenance Record and Measurement Form

SECTION 4.4 ENGINEERING HANDBOOK 7

A-1 4/22/11

ATTACHMENT A - CROWN TRANSMITTER SITE PREVENTIVE

MAINTENANCE PROCEDURES

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 Crown transmitters use ROAMS (Remote Off Air Monitoring System) and Burk Technology (Lynx) GSC3000 Broadcast Facility Control Systems remote software (Version 5.0).

Table A-1. Remote Performance Monitoring Schedule for Crown NWR Transmitters

* ALL MONITORING CHECKS BELOW TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Remarks

1. Remote Check of Voice Broadcast and Stored Fault Conditions

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

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

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

4. Listen to the alarm status message. The ROAMS voice should state “Alarm 1 (or 2) inactive”, indicating the alarm status of the inactive or standby transmitter. >>>

5. ROAMS will request a password.

SLOWLY key in the 3-digit code. Each keystroke is echoed by ROAMS. Repeat if no feedback.

6. Press 3 to monitor NWR audio input.

Wait until ROAMS asks for next command.

7. Press 4 to monitor ROAMS receiver broadcast audio. Wait until ROAMS asks for next command.

8. Press 5 to terminate the call. Repeat steps 1 thru 5 above to access ROAMS again then proceed to the next step.

9. Press 1, listen to the status, then press 5 to put ROAMS to sleep (only for 2-5 minutes) allowing access to transmitter modem and to terminate call. Proceed immediately to dial into transmitter (Maintenance Function 2 using Lynx monitoring software (Crown Manual, Section 2). >>>

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

DO NOT make any transmitter status changes using the Lynx software once ROAMS is put to sleep (e.g., switching transmitters).

4/22/11 A-2

* ALL MONITORING CHECKS BELOW TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Remarks

2. Remote Check of Exciter/Power Amplifier Currents, Supply Voltages, Transmitter Forward and Reflected Power;

TTrraannssffeerr ttrraannssmmiitttteerr ((iiff nneecceessssaarryy)) aatt tthhee ssttaarrtt ooff aa nneeww yyeeaarr ––TTXX11 ffoorr oodddd yyeeaarrss,, TTXX22 ffoorr eevveenn yyeeaarrss

Crown: Monitor using the Burk Technology (Lynx) Version 5.0 remote software

Save the current configuration and attach to the EMRS report.

[UUssee tthhiiss wwiitthh CCaauuttiioonn:: RROOAAMMSS ccaann aallssoo bbee mmaaddee ttoo iinnhhiibbiitt ddiiaalliinngg oouutt dduurriinngg mmoonniittoorriinngg.. TToo ddoo tthhiiss,, ppeerrffoorrmm sstteeppss 11--55 aabboovvee tthheenn iinnppuutt ccooddee 99 99 11 ((sseeccoonndd ““99”” kkeeyyssttrrookkee nnoott eecchhooeedd)),, PPrreessss 11,, tthheenn PPrreessss 55.. AAfftteerr ccoommpplleettiinngg tthhee AArrmmssttrroonngg mmoonniittoorriinngg,, BBEE SSUURREE ttoo rreeppeeaatt tthhee pprreevviioouuss ddiiaall iinnhhiibbiitt sstteeppss bbuutt uussee ccooddee 99 99 22 ((iinnsstteeaadd ooff 99 99 11)) ssoo RROOAAMMSS wwiillll aaggaaiinn ddiiaall oouutt aafftteerr aa ffaauulltt..]]

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

TTrraannssmmiitttteerr TTXX11 sshhoouulldd bbee bbrrooaaddccaassttiinngg dduurriinngg oodddd yyeeaarrss ((ee..gg..,,22001111--TTXX11)) aanndd ttrraannssmmiitttteerr TTXX22 sshhoouulldd bbee bbrrooaaddccaassttiinngg dduurriinngg eevveenn yyeeaarrss ((ee..gg..,, 22001122--TTXX22))

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

A.1.2 On-Site Routine Maintenance Perform routine maintenance every 6 months, at a minimum, according to the requirements stated in the maintenance schedule (see Table A-2).

Whenever a service call is made at the transmitter site, perform the routine maintenance operations listed in Table A-2 or, if no trouble call is received from a station within a 6-month period, make a special visit to perform the routine maintenance.

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 Crown Transmitter Maintenance Record and Measurement Form (see Attachment E) is provided and should be filled in 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.

Twenty-four (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 Calibration and 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 1 through 4). Any change in audio input level outside the specifications must be reported to the WFO maintenance focal point.

NOTE: For Maintenance Function No. {8}, the transmitter output MUST be into a dummy load.

A-3 4/22/11

Table A-2. On-Site Preventive Maintenance and Performance Measurement Schedule for Crown Transmitters

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS BELOW TO BE

PERFORMED EVERY 6 MONTHS

Maintenance Function Procedure (Refer to the detailed procedures in Attachment A, Part 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

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

Visually check for 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, 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 Verification

Record readings and compare with previous recorded readings.

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

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

Record readings and compare with previous recorded readings.

If any voltages or currents abnormally high or low, troubleshoot

{6} Transmitter Carrier (operating) Frequency Verification

Carrier frequency must be within ±500 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 20 minutes

{8} Transmitter Audio Input Level CCaalliibbrraattiioonn aanndd Verification aa.. EExxtteerrnnaall SSoouurrccee

IInnppuutt LLeevveell CCaalliibbrraattiioonn

b. 1050 Hz Alert Tone

c. SAME signal from hardware panel

d. SAME burst from

CRS Console

DDiissccoonnnneecctt aauuddiioo iinnppuutt lliinnee ffrroomm WWFFOO,, iinnjjeecctt --1100ddbbmm,, 11KKHHzz ssiiggnnaall aatt iinnppuutt ttoo ttrraannssmmiitttteerr,, vveerriiffyy 44..55KKHHzz ddeevviiaattiioonn oonn IIFFRR CCoommmmss MMoonniittoorr

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

EEnnssuurreess pprrooppeerr ddeevviiaattiioonn uussiinngg aann eexxtteerrnnaall aauuddiioo ssiiggnnaall ssoouurrccee aatt tthhee ttrraannssmmiitttteerr iinnppuutt

Test tones are generated at the WFO and verified at the transmitter See Note 3 below

4/22/11 A-4

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS BELOW TO BE

PERFORMED EVERY 6 MONTHS

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

Remarks

{9} Verify Proper Transmitter Transfer using ACP and CRS Console Software Application; FFiinnaall ttrraannssffeerr bbaacckk ttoo aapppprroopprriiaattee ttrraannssmmiitttteerr (dual transmitters only)

Call the appropriate WFO and have the operator switch transmitters using the CRS Audio Control Panel and CRS console software application; WWFFOO ttoo eexxeeccuuttee ffiinnaall ttrraannssffeerr ttoo oodddd yyeeaarr ((ee..gg..,,22001111--TTXX11)) oorr eevveenn yyeeaarr ((ee..gg..,, 22001122-- TTXX22)) ttrraannssmmiitttteerr

ROAMS still disabled when switching transmitters

SSeeee NNoottee 44 bbeellooww

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

Check all fluid levels. Visually check generator for fluid leaks, damage, or debris, etc. Test automatic transfer switch (if applicable) and generator.

Only to be performed on NWS owned equipment. CCoonnttaacctt aapppprroopprriiaattee NNWWSS RReeggiioonnaall ppooiinntt ooff ccoonnttaacctt ffoorr ssiittee ssppeecciiffiicc ggeenneerraattoorr gguuiiddaannccee..

Table A-3. Off-Site Performance Measurement Schedule For Crown Transmitters

ALL MEASUREMENTS BELOW TO BE PERFORMED ONCE PER YEAR

Maintenance Function Procedure Remarks

{11} Signal Strength Measurement

Refer to the procedures in Attachment A, Part 2

Time interval: 9 to 13 months Normally performed by NWS technicians or Regional Maintenance Specialists (RMS)

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).

2. Warm up the Communications Analyzer at least 20 minutes prior to using it for measurements.

3. After procedure {8} in Table A-2 has been performed, the antenna cable will be disconnected from the dummy load and reconnected to the antenna.

4. Procedure {9} attempts to equalize the operating time for each transmitter (dual models) aanndd ttoo ssiimmpplliiffyy wwhhiicchh ttrraannssmmiitttteerr sshhoouulldd bbee bbrrooaaddccaassttiinngg aatt aa ggiivveenn ttiimmee..

A-5 4/22/11

PART 2 Preventive Maintenance Procedures for CROWN Model WR-100/300/1000 Transmitters

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

NOTE: Twenty-four (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 (ssppeecciiffyy ssttaarrtt ttiimmee aanndd nnuummbbeerr ooff hhoouurrss).

1. 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.

2. 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.

3. 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.

4. Transfer to Local Control: On the Redundant Transmitter Controller, push the REM/LOC switch so that the LED below “R/L” glows red (the LED below PWR is still green).

5. Push the DISABLE AUTO SELECT switch until the red LED above the switch is flashing.

Push the VOX DISABLE and ENABLE BACKUP switches (red LEDs will flash).

6. AA llaappttoopp wwiitthh tthhee BBuurrkk TTeecchhnnoollooggyy ((LLyynnxx)) GGSSCC33000000 RReemmoottee SSooffttwwaarree iinnssttaalllleedd ccaann bbee ccoonnnneecctteedd nnooww ttoo tthhee llooccaall sseerriiaall oorr UUSSBB ppoorrtt ooff tthhee RRTTCC ffrroonntt ppaanneell uussiinngg tthhee aapppprroopprriiaattee ccaabbllee ccaabbllee [[IIff ccoonnnneeccttiinngg ffoorr tthhee ffiirrsstt ttiimmee,, tthhee oorrddeerr ooff pprreeffeerreennccee ttoo ccoonnnneecctt ttoo tthhee ccoonnttrroolllleerr iiss:: 11)) TThhee RRSS223322 ccaabbllee ((ee..gg..,, CCOOMM11)),, 22)) AA UUSSBB ttoo RRSS223322 aaddaapptteerr ccaabbllee ((uussiinngg tthhee ddrriivveerr CCDD)) pplluuss tthhee RRSS223322 ccaabbllee ((ee..gg..,, CCOOMM66)),, 33)) AA UUSSBB((AA)) ttoo UUSSBB ((BB)) pprriinntteerr ccaabbllee –– ddoowwnnllooaadd tthhee ccoorrrreecctt ddrriivveerr bbeeffoorree ggooiinngg ttoo ssiittee ((ee..gg..,, CCOOMM77)).. OOnnccee ccoonnnneecctteedd ttoo tthhee ccoonnttrroolllleerr ppaanneell,, bbee ssuurree ttoo ccoonnffiirrmm tthhaatt CCOOMM ddrriivveerr wwaass ccoorrrreeccttllyy iinnssttaalllleedd aanndd nnoottee tthhee CCOOMM ppoorrtt nnuummbbeerr uunnddeerr WWiinnddoowwss ““DDeevviiccee MMaannaaggeerr”” ((uunnddeerr ““PPoorrttss”” oorr ““UUnniivveerrssaall SSeerriiaall BBuuss CCoonnttrroolllleerrss”” )).. RReeffeerr ttoo tthhee GGSSCC33000000 BBrrooaaddccaasstt FFaacciilliittyy CCoonnttrrooll SSyysstteemmss IInnssttaallllaattiioonn aanndd OOppeerraattiioonn MMaannuuaall ((55 SSeerriieess)) ffoorr ssooffttwwaarree iinnssttaallllaattiioonn aanndd iinntteerrffaacciinngg.

7. For a 1000 watt dual transmitter system, on the non-broadcasting transmitter WS1000 power supply panel, turn OFF (0) the front panel power switch and turn OFF the ganged circuit breaker in the back (above the power cord). On the non-broadcasting transmitter WR100 or WR300 exciter/power amp panel, turn OFF (0) the carrier switch, then turn OFF

(0) the power switch.

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.

4/22/11 A-6

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

(Refer to section 5.15 in the Crown User Manual)

a. 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.

b. There is 1 filter in each 100 and 300 watt exciter/power amp. In each 1000 watt power amp, there are 4 filters - 3 in the power amp (2 are in back) and 1 in the power supply.

In the non-broadcasting transmitter, remove the screws from the power supply, 1000, 300, and 100 watt (as applicable) power amp front panel filter covers to access each of the air filters. For the 1000-watt power amp, remove the four screws in the back holding the 2 small air filters. Alternatively, remove the air filters and vacuum clean, taking care with the 2 small filters not to suck them into the vacuum cleaner. If very dirty, the filters may be changed with a spare new one 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:

• 100/300/1000 Watt, front panel, Exciter/Driver, 15.5" X 2.75" thin foam:

CR-D7130-4

• 1000 watt, front panel, Power Supply, 14.5" X 4" metal frame: CR-C10560-8

• 1000 watt, front panel, Power Amplifier, 16.5" X 4" thick foam: CR-900403-1

• 1000 watt, rear panel, Low Pass Filter, 1.75" X 1.5" square foam: CR-100884-1

c. Re-install the air filters and covers.

d. If in an extremely dirty environment, for the non-broadcasting transmitter, turn off the power amp and exciter front panel switches and circuit breakers. Disconnect any cables from the back of the units, pull out the units from the rack, remove the top cover plate then use dry and oil-free compressed air, soft bristle brush, and vacuum to remove any dust that accumulates on modules, circuit cards, and other components.

e. Record which filters were replaced in Attachment E.

{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 (both front and back) of the broadcasting transmitter are operating properly and not abnormally noisy (the front filter covers may have to be removed to view the fans). Record the location of any failed or defective fans in Attachment E.

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

Check the AC input voltage by using a multimeter to measure at the terminal blocks where power enters the cabinet (transmitter must be powered down first to remove the 4 screws holding the cover over the blocks). 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.

A-7 4/22/11

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

Check the indicators on the broadcasting transmitter. Record all information in Attachment E.

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 58). The date code format (MO=month; DD=day;

Y=year; M=mfr. use only) of the Power-Sonic is MO DD Y M (example: 12144L is Dec. 14, 2004) and the Panasonic is Y MO DD (example: 041214 is Dec. 14, 2004). Record the battery date in Attachment E. Replace the battery if over 4 years old with a Power-Sonic model PS- 612 (or Panasonic LCR6V1.3P). Refer to Maintenance Note 58 (ROAMS Sealed Lead-Acid Battery Replacement) for the replacement procedures.

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

NOTE: 1. Skip steps a through e if the external power meter is already attached to an antenna.

a. Turn off the broadcasting transmitter prior to attaching an external power meter: For a 1000 watt dual transmitter system, on the broadcasting transmitter WS1000 power supply panel, turn OFF the ganged circuit breaker in the back, then turn OFF (0) the power switch (if applicable). On the broadcasting transmitter WR100 or WR300 power amp panel, turn OFF (0) the carrier switch, then turn OFF (0) the power switch.

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

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

NOTE: 2. The Bird 43 wattmeter is most accurate when reading full scale. It is therefore recommended to use the elements specified in step d.

d. Install the appropriate calibrated external power meter, ddiirreeccttiioonnaall ccoouupplleerr,, oorr ppoowweerr sseennssoorr (use appropriate element for a Bird 43 - 100W element for WR-100, 500W element for WR-300, 1000W element for WR1000) between the cavity RF directional coupler connector and the antenna cable ((aa 77//1166 DDIINN mmaallee ttoo TTyyppee NN ffeemmaallee aaddaapptteerr mmaayy hhaavvee ttoo bbee uusseedd aalloonngg wwiitthh aa 2255 iinncchh LLMMRR--440000 TTyyppee NN mmaallee ttoo mmaallee ccaabbllee ttoo pprreevveenntt tthhee hheelliiaaxx ffrroomm bbeennddiinngg.. TThhee pprrooppeerr ccaabbllee lleennggtthh iiss nneecceessssaarryy ttoo mmaaiinnttaaiinn aanntteennnnaa ccaabbllee pphhaassiinngg))..

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

f. For the WR1000 only: For the transmitter that had been broadcasting, turn ON the WS1000 power supply switch then turn ON the circuit breaker in back (if applicable).

g. On the WR100/WR300 power amp panel, turn ON the power switch, then turn ON the carrier switch.

4/22/11 A-8

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

i. Record the forward power value from the external power meter in Appendix E. If the forward power exceeds ± 10% of the normal operating power, corrective action must be taken.

j. Switch the wattmeter to “Reflected” power and measure [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 50-watt element insuring 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]. Record the reflected value in Attachment E 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).

k. 100/300 Watt exciter/power amp: On the WR100/WR300 Power Amplifier meter and display panel, use the Meter 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 Antenna SWR on the function indicator LEDs. Record the values in Appendix E.

l. 1000-Watt exciter/power amp: On the WA1000 Power Amplifier meter and display panel, use the Metering up/down buttons to select (on the function indicator LEDs) the following parameters and record in Appendix E: Power Out, PA Temp, In Ref, SWR, and ACC, on the LED display.

m. RReeffeerr ttoo SSeeccttiioonn 22 ooff tthhee CCrroowwnn UUsseerr’’ss MMaannuuaall aanndd tthhee BBuurrkk TTeecchhnnoollooggyy ((LLyynnxx)) GGSSCC33000000 BBrrooaaddccaasstt FFaacciilliittyy CCoonnttrrooll SSyysstteemmss IInnssttaallllaattiioonn aanndd OOppeerraattiioonn MMaannuuaall ttoo sseett uupp aanndd ccoonnnneecctt aa llaappttoopp ((wwiitthh tthhee LLyynnxx 55..00 ssooffttwwaarree aapppplliiccaattiioonn iinnssttaalllleedd)) ttoo tthhee llooccaall sseerriiaall ppoorrtt ooff tthhee RRTTCC ffrroonntt ppaanneell.. UUssee tthhee LLyynnxx ssooffttware to 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 100/300 Watt exciter/power amp: Record the following measurements in Appendix E. On the power amp meter and display 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. Press the up or down arrow switch until the PA DC Amps LED lights, then read on log the supply current on the LED display. Compare values recorded with previous results. If the currents are incorrect, refer to the Crown User Manual for troubleshooting procedures.

1000-Watt power amp (if applicable): On the WA1000 Power Amplifier meter and display panel, use the Metering up/down buttons to select PA Voltage (green LED will light). Read and log the power amplifier supply voltage on the LED meter. Use the Metering up/down buttons to select Tot Current, PA1, PA2,....PA8 on the function indicator LEDs, read the values on the LED display, then record the in Appendix E and compare with previous results.

NOTE: It is recommended to keep these values within 0.5 to 0.7 amps of each other.

A-9 4/22/11

{6} Transmitter Carrier Frequency Verification Using a communications analyzer with an antenna attached to the RF input connector, verify the carrier frequency is within +/- 500Hz 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 carrier frequency reading in Attachment E. If more than 500 Hz off assigned carrier frequency, the exciter needs to be replaced since there is no maintenance adjustment.

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

a. 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).

b. 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. TThheerree iiss aa ddeevviiaattiioonn aaddjjuussttmmeenntt oonn tthhee EExxcciitteerr LLooww PPaassss FFiilltteerr bbooaarrdd,, RR1144,, aacccceessssiibbllee tthhrroouugghh aa hhoollee iinn tthhee eexxcciitteerr ttoopp ccoovveerr ((aanndd aa CCrroowwnn ffrroonntt ppaanneell LLEEDD bbaarr ggrraapphh ““MMoodduullaattiioonn”” sseennssiittiivviittyy aaddjjuussttmmeenntt -- sseeee CCrroowwnn mmaannuuaall)).. IIff tthhee lleevveell iiss eexxcceessssiivvee oorr cclliippppiinngg,, ffiirrsstt ppeerrffoorrmm PPrroocceedduurree {{88}} ttoo vveerriiffyy pprrooppeerr aauuddiioo lleevveellss pprriioorr ttoo aaddjjuussttiinngg RR1144 oorr ttrroouubblleesshhoooottiinngg tthhee ttrraannssmmiitttteerr.. Record the readings in Attachment E.

NOTE: Skip to Procedure {8} (“Transmitter Audio Input Level Calibration and Verification”) if maintenance on both transmitters has been completed or if working on a single transmitter.

A.2.2 Repeat Maintenance for Backup Transmitter

1. For the non-broadcasting transmitter, turn ON the circuit breaker, then turn ON the two

WS1000 power switches (if applicable), the WR100 or WR300 panel power, and the carrier switch.

2. Switch to the 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, turn OFF the WS1000 power switches (if applicable), the WR100 or WR300 carrier switch, and the power switches. Turn OFF the transmitter circuit breaker panel switch for the transmitter to be cleaned.

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

{8} Transmitter Audio Input Level Calibration and Verification

a. On the primary and backup (if applicable) transmitter, turn OFF both WS1000 power switches, front and back (if applicable), turn OFF all the WR100 (or WR300) carrier switches and power switches.

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

4/22/11 A-10

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

d. On the primary and backup (if applicable) transmitters, turn ON the transmitter circuit breaker panel switches.

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.

ee.. TTrraannssmmiitttteerr EExxtteerrnnaall SSoouurrccee IInnppuutt LLeevveell CCaalliibbrraattiioonn

11)) SSeett uupp tthhee AAMM--4488((XXTT)) aaccccoorrddiinngg ttoo AAttttaacchhmmeenntt CC..

22)) SSeett tthhee AABBSS//RREELL//SSEENNDD sswwiittcchh ttoo SSEENNDD..

33)) SSeett tthhee MMFF//DDTTMMFF//SSHHIIFFTT kkeeyy ttoo SSHHIIFFTT

33)) PPrreessss tthhee AA kkeeyy,, LLEEVVLL:: 00..00 ddiissppllaayyss..

44)) UUssiinngg tthhee kkeeyyppaadd,, eenntteerr 11 00 00 aanndd pprreessss tthhee DD kkeeyy ((++//--)).. LLEEVVLL --1100..00 ddiissppllaayyss..

55)) PPrreessss tthhee AA kkeeyy aaggaaiinn.. LLEEVVLL --1100..00 ddiissppllaayyss..

66)) UUssiinngg tthhee SSEENNDD……..SSEELL sswwiittcchh ((SSWW 66)),, ppuusshh tthhee sswwiittcchh uunnttiill tthhee SSEENNDD ppaarraammeetteerr sshhoowwss 11000044 nneeaarr tthhee bboottttoomm ooff tthhee ddiissppllaayy.. TThhee AAMM--4488 ddiissppllaayyss --1100..00 11000044..

77)) LLooccaattee tthhee aauuddiioo ssuurrggee ssuupppprreessssoorr ((UU44)) llooccaatteedd oonn tthhee ttoopp sshheellff iinn tthhee rreeaarr ooff tthhee ttrraannssmmiitttteerr ccaabbiinneett ((ssaammee aarreeaa aass tthhee RROOAAMMSS aanndd DDiiaall MMooddeemm))

88)) RReemmoovvee tthhee NNWWRR aauuddiioo ffeeeedd ccoommiinngg ffrroomm TTeellccoo oorr UUHHFF lliinnkk.. TThhiiss iiss oonn tthhee NNEETTWWOORRKK ((oorr LLIINNEE)) ssiiddee ooff tthhee ssuupppprreessssoorr ppiinnss 11 aanndd 22 aanndd iiss ttyyppiiccaallllyy tthhee OORRGG//WWHHTT ppaaiirr..

99)) CCoonnnneecctt tthhee RREEDD aanndd GGRREEEENN lleeaaddss ooff tthhee AAMM--4488 ((oorr ssiimmiillaarr ssiiggnnaall ssoouurrccee)) ttoo ppiinnss 11 aanndd 22 ooff tthhee NNEETTWWOORRKK ((oorr LLIINNEE)) ssiiddee ooff tthhee ssuupppprreessssoorr..

1100)) SSeett tthhee 22WW//44WW//44WW RREEVV sswwiittcchh ttoo 22WW aanndd tthhee TTEERRMM//BBRRDDGG sswwiittcchh ttoo BBRRDDGG..

1111)) PPllaaccee tthhee MMOONN RREECC//MMOONN SSNNDD//TTAALLKK sswwiittcchh ttoo MMOONN SSNNDD.. TThhee AAMM--4488 sshhoouulldd bbee sseennddiinngg aa lleevveell ooff --1100 ddBBmm..

1122)) CChhaannggee tthhee AABBSS//RREELL//SSEENNDD sswwiittcchh ffrroomm SSEENNDD ttoo AABBSS.. TThhee ddiissppllaayy mmaayy cchhaannggee ttoo aa vvaalluuee ooff 99..11ddBBmm oorr ssttaayy aatt --1100ddBBmm..

1133)) CCoonnffiirrmm tthhee lleevveell aatt tthhee aauuddiioo ssuurrggee ssuupppprreessssoorr uussiinngg aa ttrruuee RRMMSS vvoollttmmeetteerr.. TThhee lleevveell sshhoouulldd bbee bbeettwweeeenn --99..00 ttoo --1111 ddBBmm ((..227755 ttoo ..221188 vvoollttss))

NOTE: Some transmitters do not have a true 600 Ohm load; 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.

A-11 4/22/11

1144)) Turn ON the front and back power switches to the WS1000 power supplies (if applicable), 1155)) TTurn ON the WR100 (or WR300) power switches and carrier switches for thhee ttrraannssmmiitttteerr tthhaatt hhaadd bbeeeenn bbrrooaaddccaassttiinngg.. (Note: should still be in LOCAL control).

1166)) UUssiinngg aa ccoommmmuunniiccaattiioonnss aannaallyyzzeerr wwiitthh aann aanntteennnnaa oonn tthhee iinnppuutt,, mmeeaassuurree aanndd rreeccoorrdd ((iinn AAttttaacchhmmeenntt EE)) tthhee mmoodduullaattiioonn oonn tthhee ddiiggiittaall ddiissppllaayy ((44..55 kkHHzz ++//-- 00..55)) VVeerriiffyy tthhee ssiinnee wwaavvee oonn tthhee CCRRTT iiss ssyymmmmeettrriiccaall aanndd iiss nnoott ddiissttoorrtteedd.. IIff tthhee ddeevviiaattiioonn iiss nnoott ccoorrrreecctt oorr tthhee wwaavveeffoorrmm ddiissppllaayyss ddiissttoorrttiioonn,, ppeerrffoorrmm ttrraannssmmiitttteerr aalliiggnnmmeenntt..

1177)) OOnn tthhee RRTTCC ffrroonntt ppaanneell,, ttuurrnn OOFFFF tthhee ccaarrrriieerr aanndd ppoowweerr sswwiittcchheess ffoorr tthhee bbrrooaaddccaassttiinngg ttrraannssmmiitttteerr..

1188)) DDiissccoonnnneecctt tthhee AAMM--4488 ffrroomm tthhee ssuupppprreessssoorr aanndd rreeccoonnnneecctt tthhee NNWWRR aauuddiioo ffeeeedd ffrroomm tthhee WWFFOO..

f. 1050 Hz Warning Alert Tone Verification:

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

22)) SSeettuupp tthhee IIFFRR 11220000SS ((oorr 11220000SSSS)) CCoommmmuunniiccaattiioonn MMoonniittoorr,, uussiinngg AAttttaacchhmmeenntt DD..

3) Using clip leads, connect the AM-48 Test Set (see 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.

44)) MMaakkee ssuurree tthhee bbrrooaaddccaassttiinngg ttrraannssmmiitttteerr iiss ccoonnnneecctteedd ttoo tthhee DDuummmmyy LLooaadd aanndd NNOOTT ttoo tthhee AAnntteennnnaa.. TTuurrnn OONN tthhee WWRR110000 ((oorr WWRR330000)) ppoowweerr sswwiittcchheess aanndd ccaarrrriieerr sswwiittcchheess ffoorr tthhee ttrraannssmmiitttteerr tthhaatt hhaadd bbeeeenn bbrrooaaddccaassttiinngg..

5) Request that the WFO transmit the alert tone (they will use the procedures in Attachment B, Part 1) from the CRS console for the purpose of verifying proper signal level on the audio program line and resulting modulation deviation. AAsskk tthhee WWFFOO iiff tthheeyy hhaavvee rreecceennttllyy oorr wwiillll nnooww mmeeaassuurree tthhee oouuttppuutt ooff tthhee aapppprroopprriiaattee AASSMM ccaarrdd ((sshhoouulldd bbee aatt aa lleevveell ooff 00 ddBBmm))

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. 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 ACRS Maintenance Manual@, Appendix H, CRS System Alignment Procedures, Section H-5.1). IIff tthhee AASSMM ccaarrdd oouuttppuutt lleevveell iiss ccoorrrreecctt and the level of -9 to -12 dBm still cannot be obtained, check the phone line oorr ppeerrffoorrmm ttrraannssmmiitttteerr ttrroouubblleesshhoooottiinngg pprroocceedduurreess. 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) and record in Attachment E. 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.

g. NWRSAME Level Verification (Generated from SAME Hardware Panel):

4/22/11 A-12

1) If not already performed, repeat steps f (1) through (4) in the “1050 Hz Warning Alert Tone Verification.”

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

3) At the audio input to the transmitter, measure and record in Attachment E 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.

4) Using a communications analyzer with an antenna on the input, measure and record (Attachment E) the modulation on the digital display (4.5 kHz "0.5). Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, ppeerrffoorrmm ttrraannssmmiitttteerr ttrroouubblleesshhoooottiinngg.

h. NWRSAME Level Verification Procedures (Generated from CRS console):

1) If not already performed, repeat steps e (1) through (4) in the “1050 Warning Alert Tone Verification.”

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

3) At the audio input to the transmitter, measure and record in ATTACHMENT E 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.

4) Using a communications analyzer with an antenna on the input, measure and record (ATTACHMENT E) the modulation on the digital display (4.5 kHz 0.5).

Verify the sine wave on the CRT is symmetrical and is not distorted. If the deviation is not correct or the waveform displays distortion, ppeerrffoorrmm ttrraannssmmiitttteerr ttrroouubblleesshhoooottiinngg

i. If both transmitters (if applicable) have been completed, disconnect the AM-48 (or AC Voltmeter) from the back of the telephone input terminals then go to step A.2.3, “Returning Transmitter(s) back to Remote Control Operation.” Otherwise, proceed to the next step.

j. Switch to the other transmitter (if applicable) by pushing the SWITCH TRANSMITTER switch on the RTC panel. The other (Backup) transmitter should now begin to operate.

k. Go back to procedure {8}, step f to repeat audio input level verifications for the other transmitter (also repeat steps {8} g and h).

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

1. On the primary and backup (if applicable) transmitters, turn OFF the WS1000 power switches (if applicable), turn OFF the WR100 (or WR300) carrier switches and power switches.

2. Locate the appropriate circuit breaker in the NWR transmitter electrical panel box, then switch all the circuit breakers for the transmitters 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.

A-13 4/22/11

4. On the primary and backup (if applicable) transmitters, turn ON the transmitter circuit breaker panel switches. Turn ON the front and back power switches to the WS1000 power supplies (if applicable), turn ON the WR100 (or WR300) power switches and carrier switches.

5. Transfer back to remote control: On the RTC panel, push in the DISABLE AUTO SELECT and VOX DISABLE switches (all flashing red LEDs should be off).

6. On the RTC panel, push the REM/LOC switch so the LED below the R/L indicates green.

{9} Verify Proper Transmitter Transfer using Audio Control Panel (ACP) and CRS Console Software Application; Final Transfer back to Appropriate Transmitter (dual transmitters only)

a. Call the WFO to coordinate the sending of transfer tones from the WFO to the transmitter site. Follow the procedures in Attachment B, Part 4. Verify proper switching of the transmitters and record in Attachment E.

b. Ensure that the odd number transmitter (TX1) is the one operating during the odd calendar year or the even number transmitter (TX2) is operating during the even calendar year. For example, if the year is 2011, TX1 should be the operating transmitter, if year is 2012, TX2 should be the operating transmitter. If not, notify the WFO to use the CRS Software Application to switch transmitters. Make sure the final transfer is recorded in Attachment E.

c. Returning Transmitter(s) to Normal Operation:

1) Notify the WFO of completion of the maintenance action (turn off PNS maintenance message).

2) Restore the transmitter(s) to a fully operational condition and let them run for a minimum of 2 minutes. Plug the ROAMS phone line back into the ATelephone Network Interface@ box to restore the ROAMS unit to normal operation.

{10} Backup Generator and Automatic Transfer Switch Checks

NOTE: The following backup generator checks and testing are to be performed only on NWS owned generators. Contact the appropriate NWS Regional Facilities or NWR maintenance point of contact to obtain site specific guidance for the NWS generator before proceeding with the checks or testing below. This applies to both local and national maintenance contractor technicians as some model generators are to be checked/tested only by NWS personnel..

Refer to the Generator and Automatic Transfer Switch operators/maintenance manuals for the specific procedures when performing the steps below. There is a separate NWS Maintenance Schedule document for the Kohler Model 12RES and 30RYG Engine Generators and the MPAC 1500 Automatic Transfer Switches. Report any abnormalities after the following checks or testing to the associated NWS WFO Facilities Technician. Also, record the appropriate information in Attachment E and in local log books.

a. Generator Checks and Inspections

1) Check fuel level.

2) Record the generator hour meter reading in the generator log (if applicable).

4/22/11 A-14

3) Check air filter.

4) Check oil level.

55)) Check for LP Gas leaks (if applicable) at the pipe joints with “Snoop Leak Detector” or equivalent liquid leak detector.

6) Check coolant level and coolant heater (if applicable).

7) Check for fluid leaks or damage to the generator.

8) Remove any corrosion from the generator battery and check the battery charger.

9) Check the electrical connections and condition of the hoses.

10) Check on and around the generator (including dampers) for debris which may inhibit the startup or proper operation of the generator.

b. Generator and Automatic Transfer Switch (ATS) Testing

1) If the NWR transmitter (plus HVAC units and lighting) is the ONLY load on the NWS backup generator, proceed to step 2. If there is other tenants’ equipment in the shelter beside the NWR transmitter that is connected to the NWS generator (unless permission has been granted by the other tenants to kill utility power and test under load as described in step 2), switch the Automatic Transfer Switch (ATS) to a “No Load” and Manual (or Local) setting, making sure the ATS is NOT CONNECTED to any of the circuit breakers connected to equipment. Start and run the backup generator for 20 minutes without any load. While running, check the exhaust system for leakage. When complete, switch the ATS back to a “With Load” and Automatic setting and the Generator back to Automatic startup. This completes the generator checks.

2) The following steps are to be performed if the NWR transmitter (plus HVAC units and lighting) is the ONLY load on the NWS backup generator: Verify the automatic transfer switch and Generator is in an Automatic (or Normal) setting. Locate the transmitter main power disconnect that is connected to the generator automatic transfer switch. Turn OFF the transmitter main disconnect (simulating a loss of utility power) and ensure the transfer switch starts up the generator. Verify the transmitter powers back up and transmits within normal parameters. While running, check the exhaust system for leakage.

3) If a Remote Off Air Monitoring System (ROAMS) is installed at the transmitter site to monitor the generator, verify that ROAMS has reported the switch to generator power either through the ROAMS Advanced Management System (RAMS) or by calling the appropriate WFO to check if ROAMS has reported the switchover.

4) Run the generator with the transmitter on and connected to the generator for 20 minutes.

After 20 minutes, turn the transmitter main disconnect switch back ON and verify the switchover to utility power then generator cool-down and shutdown. Verify the transmitter powers back up and transmits within normal parameters.

5) Record the generator hour meter reading (if applicable) in Attachment E and local log book.

A-15 4/22/11

{11} Signal Strength Measurement (annually only)

NOTE: This procedure will normally be performed by NWS technicians or Regional Maintenance Specialists (RMS).

The annual (can be between 9 to 13 months) signal strength measurements must be made at a minimum of four different land locations that are approximately 90 degrees apart and a minimum of 5 to a maximum of 20 statute miles radius from the transmitter site (use the same locations as used the previous year and each year thereafter for consistency).

Contact the appropriate government representatives to receive the previous signal strength report for comparison. If a contractor is making the measurements, the signal strength measurement report must be provided to the Government Contracting Officer’s Technical Representative within 15 days of the performed measurements.

The report must detail the transmitter site data, antenna data (orientation, height, etc.) , the readings (in uV/m and dBuV/m), and the approximate radial distance of each measurement from the transmitter.

Suggested hardware to measure the signal strength:

To be determined (the Protek 3201 has been used at some sites).

B-1 4/22/11

ATTACHMENT B -…