ATTACHMENT D CROWN.pdf

ENGINEERING HANDBOOK 7 SECTION 4.4

Crown Maintenance Schedule EHB-7 2/8/06

COMMUNICATIONS EQUIPMENT MAINTENANCE SCHEDULE – CROWN TRANSMITTERS

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 Rock Hill, SC and Melbourne, FL (1000 Watt dual)

ESTIMATED COMPLETION

DATE:

• Monthly (remote maintenance)

• Every 4 months (on-site maintenance)

• Yearly (signal strength measurements)

TIME REQUIRED: • Monthly remote maintenance: 15 minutes

• On-site Maintenance: 2 hours

• Yearly 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.)

Wayne Hart: Wayne.Hart@noaa.gov 301-713-1847 x192

Peter Georgiou: Peter.Georgiou@noaa.gov 301-713-1847 x189

DISPOSITION OF

REMOVED

PARTS/MATERIALS:

Not applicable.

SECTION 4.4 ENGINEERING HANDBOOK 7

EHB-7 Crown Maintenance Schedule 2/8/06 2

TOOLS AND TEST

EQUIPMENT REQUIRED:

• Communications Analyzer (e.g., IFR FM/AM 1200S Communications Monitor or equivalent)

• Digital Multimeter

• Ameritec AM-48 Transmission Line Test Set (if available)

• AC RMS voltmeter (e.g., HP 400E or equivalent) or AM-48

• 1500 Watt Dummy Load

• Wattmeter with 25W, 50W, 100W, 500W, 1000W, 2500W elements (e.g., Bird 43)

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

PE3455-36)

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

PE3455-72)

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

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

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

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

• Signal Strength Meter or Signal Strength Measurement System

• Vacuum cleaner

• Tool Kit (including a 12" Crescent wrench)

DOCUMENTS AFFECTED: None.

3 2/8/06

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

Wayne Hart:: Wayne.Hart@noaa.gov 301-713-1847 x192

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

Peter Georgiou: Peter.Georgiou@noaa.gov 301-713-1847 x187

2/8/06 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

Mark S. Paese Digitally signed by Mark S. Paese DN: cn=Mark S. Paese, o=DOC/NOAA/NWS, c=US Date: 2006.02.13 15:23:43

-05'00'

Signature Not Verified

A-1 2/8/06

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 Crown (Gentner) special dial-in software.

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 >>> using Gentner software (Crown Manual, sect. 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 Gentner software once ROAMS is put to sleep (e.g., switching transmitters)

2/8/06 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

Crown: Monitor using the Gentner GSC300 software

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

* 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 4 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 4-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 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 2/8/06

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

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS BELOW TO BE

PERFORMED EVERY 4 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 Verification

a. 1050 Hz Alert Tone

b. SAME signal from hardware panel

c. SAME burst from

CRS Console

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.

Test tones are generated at the WFO

2/8/06 A-4

ALL MAINTENANCE AND PERFORMANCE MEASUREMENTS BELOW TO BE

PERFORMED EVERY 4 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; Final Transfer to Backup 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

ROAMS still disabled when switching transmitters

{10} Backup Generator and Automatic Transfer Switch Checks (Government 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 Government owned equipment

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 the above table 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). If the operator has already switched recently the last part does not have to be performed.

A-5 2/8/06

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.

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. 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.

7. 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.

{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, 2/8/06 A-6 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.

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 lamps of the broadcasting transmitter. Refer to procedure in SR-416 Instruction Manual, Paragraph 4.3. 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.

A-7 2/8/06

{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 a calibrated external Power Meter (use appropriate element for a Bird 43 - 100W element for WR-100, 500W element for WR-300, 1000W element for WR1000) between the cavity output connector and the antenna cable (the 7/16 DIN to Type N adapters may have to be used along with a 3 foot, RG142B Type N male to male cable and a 3 foot male to female cable to prevent heliax from bending).

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

f. 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.

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 to 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).

2/8/06 A-8

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. Refer to Section 2 of the Crown User’s Manual to set up and connect a laptop (with the Gentner GSC3000 program installed) to the local serial port of the RTC front panel.

Use the Gentner software 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: 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 the supply current on the LED display. Record the values in Appendix E and compare 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.

{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. There is no deviation adjustment (only a Crown front panel LED bar graph “Modulation”

A-9 2/8/06 sensitivity adjustment - see Crown manual). If it is excessive or clipping, first perform Procedure {8} to verify proper audio levels prior to troubleshooting the transmitter.

Record the readings in Attachment E.

NOTE: Skip to Procedure {8} (“Transmitter Audio Input Quality Verifications”) 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 Verifications

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.

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. 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 (Note: should still be in LOCAL control).

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.

e. 1050 Hz Warning Alert Tone Verification:

2/8/06 A-10

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.

2) If using the IFR 1200S Communication Monitor, setup using Attachment D.

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.

4) Make sure the broadcasting transmitter is connected to the Dummy Load and NOT to the Antenna.

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.

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). If the level of -9 to -12 dBm still cannot be obtained, check the phone line or perform the NWR System Adjustments and Alignment (Maintenance Note 57). Notify the appropriate NWS personnel.

7) 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, perform transmitter alignment (Maintenance Note 57).

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

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 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, perform transmitter alignment.

g. 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).

A-11 2/8/06

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, perform transmitter alignment.

h. 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.

i. 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.

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

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.

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 to Backup 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 the transmitter that had been off the previous 4 months is currently broadcasting. If not, notify the WFO to use the CRS Software Application to switch transmitters. Make sure the final transfer is recorded in Attachment E.

2/8/06 A-12

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 The following backup generator checks are to be performed only on Government owned generators. Report any abnormalities to the associated WFO Facilities Technician. Refer to the Generator and Automatic Transfer Switch operators/maintenance manuals for the specific procedures when performing the steps below. Record the appropriate information in Attachment E.

a. Check fuel level.

b. Check air filter.

c. Check oil level.

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

e. Check for fluid leaks or damage to the generator.

f. Remove any corrosion from the generator battery and check the battery charger.

g. Check the electrical connections and condition of the hoses.

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

i. While running (see below for startup) check the exhaust system for leakage.

j. If the NWR transmitter is the ONLY load on the backup generator, proceed to the next step (k). If there is other equipment in the shelter besides the transmitter that is connected to the generator, 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 30 minutes without any load. 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.

k. Verify the automatic transfer switch and Generator is in a “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 and ensure the transfer switch starts up the generator. Verify the transmitter powers back up and transmits properly. Run the generator with the transmitter on and connected to the generator for 30 minutes.

l. After 30 minutes running on the generator, turn the transmitter main disconnect switch back ON and verify the switchover to utility power and generator shutdown.

A-13 2/8/06

{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 2/8/06

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)

(Performed at the WFO by NWS personnel)

NOTE: 1. Prior to performing the generation of test signals for the transmitter, verify that the procedures in the NWR CRS Maintenance Manual, Appendix H, “CRS System Alignment,” have been completed and the measured values recorded. Also, ensure the index mark on the Tone volume control knob is set to the reference position as determined in Section 4.1, “ACP Ref Mark Alignment.”

1. Position the ACP Channel Select knob to correspond with the transmitter to be tested.

2. Start Backup Live (BUL) on the appropriate ASM output channel by pushing the Transmitter Select [appropriate channel number] button and the Transmitter Select Enable button in sequence. These buttons are located in the BACKUP LIVE block area on the front of the ACP.

NOTE: 2. The alert tone output from the ACP lasts for only 10 seconds. It is recommended that a second person push the Alert Tone 1 button for a near continuous tone output.

3. Push the Transfer/Alert Tones 1 button to send the 1050 Hz alert tone to the ASM card corresponding to the transmitter under test (VU meter should indicate approx. 100). If the VU Meter does NOT indicate 100 modulation, the CRS output is not correctly aligned.

Perform Appendix H of the CRS Maintenance Manual. Inform the technician to check the audio and deviation levels at the transmitter site.

4. Repeat this step as needed until the technician can verify proper levels.

5. To stop the Backup Live output from the ACP, push the Transmitter Select Enable button and then the Transmitter Select [appropriate channel number under test] button in sequence.

2/8/06 B-2

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

(Performed at the WFO by NWS personnel)

NOTE: 1. Prior to performing the generation of test signals for the transmitter, verify that the procedures in the NWR CRS Maintenance Manual, Appendix H, “CRS System Alignment,” have been completed and the measured values recorded. Also, ensure the index mark on the Tone volume control knob is set to the reference position as determined in Section 4.1, “ACP Ref Mark Alignment.”

1. Position the Audio Control Panel (ACP) Channel Select knob to correspond with the transmitter to be tested.

2. Start Backup Live on the appropriate Transmitter by pushing the Transmitter [appropriate channel number] button and the Enable button in sequence. These are located in the BACKUP LIVE block area on the front of the ACP.

3. Initiate a continuous NWRSAME preamble tone output from the NWRSAME panel by pressing the TEST key once and then the SEND key (VU meter should indicate approx. 50%).

If the level is NOT at 50% on the VU meter, notify the technician to align the output level of the backup SAME panel. (Appendix H, section H-4.3 of the CRS Maintenance Manual). If the 50% reading is incorrect, notify the technician at the transmitter site, and if there is another SAME panel available, repeat step 3 with the new SAME panel.

NOTE: 2. The front panel key sequence on the NWRSAME for a continuous NWRSAME preamble tone output is TEST and then SEND. Pressing the CANCEL key stops the sequence.

4. Wait for the technician to record the deviation and levels before proceeding to the next step.

Push the CANCEL key on the NWRSAME to stop the generation of the preamble.

5. Push the Enable button and Transmitter [appropriate channel number] button in sequence to stop Backup Live.

B-3 2/8/06

PART 3 Procedure to Generate SAME Burst Tones from the CRS Console (Performed at the WFO by NWS personnel)

NOTE: 1. Prior to performing the generation of test signals for the transmitter, verify that the procedures in the NWR CRS Maintenance Manual, Appendix H, “CRS System Alignment,” have been completed and the measured values recorded. CRS Application Software Version 9.0 must be installed to use the CRS SAME header tone feature.

1. Position the Audio Control Panel (ACP) Channel Select knob to correspond with the transmitter being tested.

2. Log in to the CRS application as Admin (if logged in as a different user).

3. In the CRS Application window, select the Transmitters menu and then select Transmitter Configure. Select the Transmitter to be used for the test then click Disable in the Status Section. Click the Save hot key to change the transmitter status.

4. IMPORTANT! Click the Exit hot key (the large X in the upper right of the display) to close the Transmitter Configure window.

5. Click the Maintenance menu and then select WRSAME Tone Generator.

NOTE: 2. The SAME Tone operation window is a default window when the Off-line Tone Generator program starts up. It can also be selected by clicking the SAME Tones button from the CRS Tone Maintenance Utility window. The possible data values associated with this window are as follows:

a. The SAME tone amplitude can be set from 1 to 99 (6 is a good starting point).

b. The SAME tone duration can be set from 1 to 30 seconds, "1 second (20 is a good starting point).

c. The Save Amplitude button is used to dynamically update the amplitude level for the selected transmitter. The amplitude is saved in the transmitter configuration and downloaded to the appropriate DECtalk card.

6. In the Choices section under Transmitters, click the transmitter in the displayed list that corresponds to the transmitter being tested. This is the same transmitter number that was selected with the ACP Channel Select knob.

7. Adjust the SAME Tone Duration slider bar to 15 seconds.

NOTE: 3. The SAME tone output amplitude should be equal -4.5 dBm " 0.5 on the AM-48 Test Set when measured at the ASM card in the WFO. If this was not correct, perform the “DECtalk Card SAME Tone Output Level Adjustment” (section H-6.2) in Appendix H of the CRS Maintenance Manual.

8. Communicate with the transmitter site that you are ready to send the SAME header preamble.

9. Click the Start To Send button to start the broadcast of the SAME preamble. The VU meter on the ACP should indicate approximately 50. If the meter does NOT indicate about 50, perform

2/8/06 B-4 the ADECtalk Card SAME Tone Output Level Adjustment@ (section H-6.2) in Appendix H of the CRS Maintenance Manual.

NOTE: 4. CRS will not immediately send the SAME header preamble. The current product in the broadcast suite will have to finish before the SAME header is sent. This could be up to 5 minutes depending on the length of the product being played.

10. Inform the technician to check the audio and deviation levels at the transmitter site.

11. If necessary, repeat steps 8 and 9. If no more SAME preambles need to be sent, select EXIT PROGRAM from the CRS Tone Maintenance Utility window (WRSAME Tone Generator).

12. Select the Transmitters menu, and then select Transmitter Configure.

13. Select the Transmitter, and then click Enable in the Status section.

14. Click the Save hot key to change the transmitter status.

15. If necessary, log out of ADMIN then log back in as the previous user.

NOTE: 5. The levels for voice, warning tone, and SAME messages have been selected to optimize the detectability by a receiver. This maximizes the transmitter modulation deviation without causing distortion. The levels selected herein assume frequency response of the telecommunications line to the transmitter is relatively flat and the pre-emphasis circuit in the transmitter is within 1.0 to 2.0 dB of the required 6.0 dB per octave. If these assumptions are incorrect, measurements at the audio input at the transmitter site on a case-by-case basis may be necessary to obtain the optimum modulation (corresponding to a deviation of 4.5 kHz for the NWRSAME tones). If the correct audio level/modulation cannot be obtained at the transmitter after the CRS system alignment and periodic preventive maintenance interval are performed, the NWR System Adjustments and Alignment (Maintenance Note 57) must be performed to determine the source of the problem.

B-5 2/8/06

PART 4 Procedure to Confirm Transmitter Transfer Using Audio Control Panel (ACP) and CRS Console

(Performed at the WFO by NWS personnel)

NOTE: 1. Prior to performing the generation of test signals for the transmitter, verify that the procedures in the NWR CRS Maintenance Manual, Appendix H, “CRS System Alignment,” have been completed and the measured values recorded. Also, ensure the index mark on the Tone volume control knob is set to the reference position as determined in Section 4.1, “ACP Ref Mark Alignment.”

2. The following procedure assumes the NWR CRS Maintenance Manual, Appendix H, Section H-6.4, “DECtalk Transmitter Transfer Tones Output Level Adjustment,” has been performed to adjust the Transfer Tone Amplitude for +1.2 (± 0.5) on the ACP VU meter. If not, perform the Transfer Tones Output Level Adjustment.

1. From the ACP, position the ACP Channel Select knob to the proper Transmitter Channel

[channel number] being tested.

2. On the Transmitter Select soft button section of the ACP, select the Transmitter [channel number] being tested then push Enable. The transmitter number and Enable buttons will light and the red On Air light will come on.

3. If the Aprimary@ transmitter is currently broadcasting, push the Pri/Sec button, wait until the technician at the transmitter site acknowledges the transfer, then select Sec/Pri. Conversely, if the Asecondary@ transmitter is broadcasting, select Sec/Pri, wait until the transfer, then select Pri/Sec.

4. To get out of Backup Live operation, press the Transmitter Select Enable button then the Transmitter [channel number] button. The Transmitter number and Enable button, and the On Air lights will go out. The CRS application is now back in control of the transmitter.

5. Log in to the CRS application as Admin (if logged in as a different user).

6. From the CRS application, select the Transmitters menu and then select Transmitter Configure. Select the button next to the proper Transmitter desired for the transfer.

7. Ask the transmitter site technician to observe which transmitter is broadcasting. Depending on which transmitter is currently broadcasting [Primary (TX1) or Secondary (TX2)], click the transmitter (Primary or Secondary) button that is NOT broadcasting, then click the diskette (save) icon in the upper left part of the window to perform the transfer.

NOTE: 3. If the diskette (save) icon is clicked after selecting the transmitter that is still currently broadcasting, a question box displays asking Do you want to re-initialize DecTalk parameters? Click Cancel to remove the question box.

8. A question box displays asking Mode has been modified. Do you want to change mode?

Click OK. The bottom of the window says Mode changed.

9. Repeat steps 7 and 8 to transfer to the other transmitter (Secondary or Primary).

10. Verify with the technician at the transmitter site to make sure the other (backup) transmitter that had been off the previous 4 months is currently broadcasting. If not, using steps 7 and 8 switch to that transmitter. Request the transmitter site technician record if the transmitters transferred

2/8/06 B-6 properly using the CRS and ACP and record the final broadcasting transmitter in Attachment E.

11. Click the Exit hot key (the large AX@ in the upper right of the display) to close the CRS Tone Maintenance Utility window and to return to normal operation.

C-1 2/8/06

ATTACHMENT C - AMERITEC AM-48 TRANSMISSION TEST SET INITIAL

SETUP

1. Power on the AM-48 Test Set using the rocker switch (upper right side).

2. Set the AM-48 Test Set controls as indicated below. (Refer to the AM-48 Instruction Manual for further explanations on setup).

FUNCTION LEFT SIDE OF TEST SET

Volume Mid position

MON RCV, MON SND, Talk Switch MON RCV

Term, BRDG BRDG

TONE, PULSE, ON HK TONE

900-ohm, 600-ohm 600-ohm

2w, 4w, 4w REV 4W

RIGHT SIDE OF TEST SET

ABS, REL, SEND ABS

DAMP, OFF OFF

SEL Filter C-MSG (Displayed at bottom of LCD reader) (Printed on Bottom of display)

SEL MEASURE L/F (Printed on Bottom of display)

SEL SEND Quiet (Printed on Bottom of display)

MF, DTMF, SHIFT DTMF

SF SKP, NOR, X TONE NOR

RCL/STC, PRINT Mid position

NOTE: Make sure the function switch TERM, BRDG is switched to BRDG. Erroneous readings will result if TERM is selected.

3. Plug in the AM-48 RJ11 telephone cable (with the 4 colored clip leads) into the Test Set. Only the Yellow (tip) and Black (ring) clip leads will be used to connect to the Transmitter telephone line audio input.

D-1 2/8/06

ATTACHMENT D - SETUP FOR IFR 1200 COMMUNICATIONS MONITOR

TO VIEW MODULATION AND DEVIATION

1. Starting from the lower left of the IFR, set the following switches as indicated:

PWR/STANDBY/BAT…