Attachment_1E4_Nautel_Preventive_Maintenance_Version_1.1.pdf

Attachment 1E4 Version 1.1 SECTION 4.4

Nautel Maintenance Schedule EHB-7 5/6/11

NWR Nautel Transmitter Preventive Maintenance Schedule and Performance Measurements (Nautel models NG300 and NG1000)

Maintenance, Logistics, and Acquisition Division

W/OPS12: JJE

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

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

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

VERIFICATION

STATEMENT:

The procedures were partially tested at the NWS Headquarters NWR Radio Room and Greer, SC

ESTIMATED COMPLETION

DATE:

• Monthly: remote maintenance

• Semi-annually (shorten interval for dusty/dirty sites): On-site maintenance

• Annually: (signal strength measurements and 10 MHz calibration)

TIME REQUIRED: • Monthly remote maintenance: 15 minutes

• On-site Maintenance: 2.5 hours

• Annual field strength measurements: 8 hours

ACCOMPLISHED BY: NWS and/or contractor electronics technicians

EQUIPMENT AFFECTED: Nautel model NG300/NG1000 (B262/B260) transmitters

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 x192

DISPOSITION OF REMOVED

PARTS/MATERIALS: Not applicable.

SECTION 4.4 Version 1.1 ENGINEERING HANDBOOK 7

EHB-7 Nautel Maintenance Schedule 5/6/11 2

TOOLS AND TEST

EQUIPMENT REQUIRED:

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

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

• Laptop or Notebook computer with Nautel NG Series Remote Application (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, 250W, 500W, 1000W, 2500W elements [[oorr MMiinnii--CCiirrccuuiittss PPWWRR--66GG++ UUSSBB PPoowweerr SSeennssoorr aanndd CCoonnnneeccttiiccuutt MMiiccrroowwaavvee 444411440044 5500ddBB DDiirreeccttiioonnaall CCoouupplleerr]])

• 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)

• 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 not using AM-48) and BNC Tee

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

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

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

• Vacuum cleaner

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

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

ENGINEERING HANDBOOK 7 DRAFT SECTION 4.4

3 5/6/11

DOCUMENTS AFFECTED: None.

PROCEDURE: Perform maintenance as specified in the following attachments:

ATTACHMENT A - Nautel Transmitter Site Preventive Maintenance Procedures Part 1 - Preventive Maintenance Table for Nautel Transmitters Part 2 - Preventive Maintenance Procedures for Nautel Model NG300/NG1000 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 - Nautel 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 x189

5/6/11 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 (Nautel) B260 Dual NWR 300 Watt Transmitter (Nautel) B262

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

Attachment A - Nautel 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 - Nautel Transmitter Maintenance Record and Measurement Form

A-1 5/6/11

ATTACHMENT A - NAUTEL TRANSMITTER SITE PREVENTIVE

MAINTENANCE PROCEDURES

PART 1 Preventive Maintenance Table for Nautel Transmitters

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 Nautel transmitters use ROAMS (Remote Off Air Monitoring System) and Nautel NG Remote Application software.

Note: Numbers in braces { } refer to the applicable sections below Table A-1.

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

* ALL MONITORING CHECKS BELOW TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Remarks

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

Install, set-up, and start the Nautel NG Remote Application but do not dial into transmitter until ROAMS is put to sleep (refer to the “Nautel Operations and Maintenance Manual”, Section 4, “Non-standard Maintenance”, Installing or Upgrading NG series Remote Application Software for software installation).

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

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

5/6/11 A-2

* ALL MONITORING CHECKS BELOW TO BE PERFORMED EVERY MONTH

Maintenance Function Procedure Remarks

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

{{CC}} TTrraannssffeerr ttrraannssmmiitttteerr ((iiff nneecceessssaarryy)) aatt tthhee ssttaarrtt ooff aa nneeww yyeeaarr ––TTXXAA ffoorr oodddd yyeeaarrss,, TTXXBB ffoorr eevveenn yyeeaarrss

{{DD}} DDiissccoonnnneecctt//cclloossee rreemmoottee aapppplliiccaattiioonn aanndd aattttaacchh ffiilleess ttoo

AA--2266

Dial-in and monitor using the NG Remote Application. Save the current configuration.

Reference procedure below to transfer as necessary.

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

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

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

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

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

a. If the Nautel NG Series Remote Application is installed and site configured on a computer, skip to step e.

If not previously installed on a laptop or desktop computer, download, install, and set-up the Nautel NG Series Remote Application (see next 3 steps for instructions). Refer to the NWS Operations Website for the latest application software (www.ops1.nws.noaa.gov ): In the “NWR/CRS/WRIP” section, click on NWR Transmitter Software Status, Log-In for access, go to the Nautel heading then click to download the latest remote application. (Reference the “Nautel Operations and Maintenance Manual”, Section 4, “Non-standard Maintenance”, Installing or Upgrading NG series Remote Application Software for install procedures.)

b. Click on the Nautel Icon on the desktop and proceed to the next step.

c. Perform the following set-up:

Site: Select or type in the <Site Name>

Login: Remote(Modem) Username: Technician

Password: <Available from the NWS Regional focal point>

Interface: <COM port for the modem used to dial out > (determine the correct COM port number using Windows Device Manager – under Ports or

A-3 5/6/11

Universal Serial Bus Controllers)

Phone Number: <Phone number of ROAMS line at Transmitter Site>

NG Remote Application Connection Window

d. Click Save site if this is the first use of the application. If asked, answer yes to overwrite the connect setting. Minimize the NG Remote Application.

e. Start the Nautel NG Series Remote Application on a laptop or desktop computer (unless already minimized) with a modem connected to an outside dial line. Under Site drop-down window, select the appropriate <Site Name> but DO NOT click “Connect”. Minimize the NG Remote Application.

NOTE: Refer to the “Nautel Operations and Maintenance Manua”l (NG300 or NG1000), Section 2: “Operating the Transmitter”, NG Series Remote Application, for information on using the application.

5/6/11 A-4

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

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

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

i. Listen to the alarm status message. The ROAMS voice should state, “Alarm Number 1 (or

2) inactive,” indicating the alarm status of the inactive or standby transmitter. Determine the problem if an alarm condition exists – a trip to the site may be necessary.

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

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

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

m. Press 1, listen to the status, then press 5 to put ROAMS to sleep allowing access to transmitter modem (but only for 2-5 minutes) and to terminate call. Proceed immediately to dial into the transmitter using the Nautel NG Remote Application (previously minimized) by clicking on Connect. Repeat previous steps to put ROAMS back to sleep if sleep mode times out. The modem will take a few minutes to connect and then the application populates with transmitter parameters indicating connection to the transmitter. [[IIff aannyy ccoonnnneeccttiioonn ffaaiilluurreess oorr aannoommaalliieess ooccccuurr,, ccoonnttaacctt tthhee NNWWSS HHeeaaddqquuaarrtteerrss OOPPSS1177 NNWWRR EEnnggiinneeeerr aatt 330011--771133--99447788 xx117733]]..

A-5 5/6/11

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

a. Once the NG Remote Application connects to the transmitter, the parameters will be displayed on the screen.

Example with System tab selected and showing TXA on, TXB off

b. Using the following table, check the listed parameters:

Tab Selected Screen Section Screen Parameter Verification

System Status Forward Power Insure Forward Power is +/- 10% of NTIA licensed power

System Status VSWR Less than 1.5:1

System Status Measured Frequency +/- 200Hz of carrier frequency

System Control Active Transmitter Active transmitter per yearly or NWS regional guidance

5/6/11 A-6

c. From the System tab, Control section, click the Standby Transmitter (…) button, click down arrow, toggle to On and click Apply. The standby transmitter will activate and be running into the dummy load internal to the transmitter. With both transmitters running, this will allow a snapshot of every component of the system.

Example with both TXA on and TXB on

NOTE: The Site ID is the Call Sign from the NTIA license. The license should be posted on the transmitter. Contact the Regional Frequency Manager for a copy if it is missing.

d. On the System tab, verify that all Alarm/Status LED indicators are Green showing no faults present and the VSWR is below 1.5:1. If you have a fault, the event log capture will show the alarm.

e. Click Save state at the bottom of the Remote Application window. The Select channels box displays.

A-7 5/6/11

Save Select Channels

f. Ensure all channels are checked and then click Apply.

g. Select a folder in which to save the csv file.

h. Name the file <Site ID_yyyymmdd>_PMI.csv and save the current configuration.

CAUTION

The following step is very important so that the secondary transmitter is not left emitting into the dummy load.

i. From the System tab under Control, select the Standby Transmitter box, and toggle to OFF and Apply.

j. Insure that the secondary transmitter is Off by verifying the RED Alarm/Status LED is ON beside the secondary transmitter (TX A Status or TX B Status).

k. If any of the Alarms were present or the VSWR is greater than 1.5:1, go to the Events tab, click on the Save events button, and download the Event file to the laptop or desktop PC.

Name the Event file using the following convention:

<Site ID_yyyymmdd>_EVT.csv. Select a folder in which to save the csv file.

5/6/11 A-8

Sample Event Screen

l. Using the following table, check the listed parameters:

Tab Selected Screen Section Screen Parameter Verification System Status TX A Deviation Peak Less than 5.0 Khz

System Status TX B Deviation Peak Less than 5.0 Khz

If the deviation is greater than 5.0 Khz, you will need to make adjustments with a site visit.

m. Click on the Configuration tab and verify that the following Firmware version blocks below are current by referring to the NWS Operations Website (www.ops1.nws.noaa.gov): In the “NWR/CRS/WRIP” section, click on NWR Transmitter Software Status, Log-In for access, go to the Nautel heading, then check to see if the website firmware versions are more newer than those on the Configuration screen:

System controller firmware version

Transmitter A firmware version

Transmitter B firmware version

A-9 5/6/11

Remote Application Configuration Screen

n. If they are newer on the website, refer to the “NG300 Operations and Maintenance Manua”l, Section 4: “Non-Standard Maintenance”, Upgrading Software to update.

{C} Transfer transmitter (if necessary) at the start of a new year –TXA for odd years, TXB for even years

a. Transmitter TXA should be broadcasting during odd years (e.g.,2011-TXA) and transmitter TXB should be broadcasting during even years (e.g., 2012-TXB). If not perform the following step.

b. `From the System tab, Control section, change the Active Transmitter parameter to the appropriate transmitter according to the year (TXA for odd years, or TXB for even years).

{D} Disconnect from transmitter and save files

a. Click Disconnect then Close the application.

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

5/6/11 A-10

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, 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 Nautel 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-11 5/6/11

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

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

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

Take corrective action as needed

{3} Check AC Input Voltage, AC Surge Protectors, Lamps, 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 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 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

5/6/11 A-12

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

{8} Transmitter Audio Input Level Calibration and 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 will perform 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

{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 and Testing (NWS owned)

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

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

Table A-3. Off-Site Performance Measurement Schedule for Nautel 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)

{12} 10 MHz System Console Output

10 MHz Calibration and Alignment

A-13 5/6/11

Verification

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 aanndd ttoo ssiimmpplliiffyy wwhhiicchh ttrraannssmmiitttteerr sshhoouulldd bbee bbrrooaaddccaassttiinngg aatt aa ggiivveenn ttiimmee..

5/6/11 A-14

PART 2 Preventive Maintenance Procedures for Nautel Model NG300/NG1000 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 Public Information Statement (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 Nautel system controller front interface panel, select the BACK push button switch to return to the status display then press the LOCAL push button switch (make sure the red LED on the “LOCAL” switch is lit). The transmitter system can now be controlled via the system controller’s front panel interface. All remote control circuits (except the external interlock) are disabled.

5. AA llaappttoopp wwiitthh tthhee NNaauutteell NNGG RReemmoottee AApppplliiccaattiioonn ssooffttwwaarree iinnssttaalllleedd ccaann nnooww bbee ccoonnnneecctteedd ttoo tthhee llooccaall sseerriiaall oorr UUSSBB ppoorrtt ooff tthhee ffrroonntt ccoonnttrroolllleerr ppaanneell uussiinngg tthhee aapppprroopprriiaattee ccaabbllee.. IIff ccoonnnneeccttiinngg ffoorr tthhee ffiirrsstt ttiimmee,, tthhee oorrddeerr ooff pprreeffeerreennccee ttoo ccoonnnneecctt ttoo tthhee ccoonnttrroolllleerr iiss:: 11)) TThhee NNaauutteell RRSS223322 ccaabbllee ((ee..gg..,, CCOOMM11)),, 22)) AA UUSSBB ttoo RRSS223322 aaddaapptteerr ccaabbllee ((uussiinngg tthhee ddrriivveerr CCDD)) pplluuss tthhee NNaauutteell RRSS223322 ccaabbllee ((ee..gg..,, CCOOMM66)),, 33)) AA UUSSBB((AA)) ttoo UUSSBB ((BB)) pprriinntteerr ccaabbllee ((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””)) –– tthhiiss wwiillll bbee nneeeeddeedd wwhheenn sseelleeccttiinngg tthhee pprrooppeerr NNaauutteell aapppplliiccaattiioonn ““IInntteerrffaaccee”” sseelleeccttiioonn.. RReeffeerr ttoo tthhee ““NNaauutteell OOppeerraattiioonn aanndd MMaaiinntteennaannccee MMaannuuaall””,, ““NNGG SSeerriieess RReemmoottee AApppplliiccaattiioonn”” ffoorr iinntteerrffaacciinngg ttoo tthhee ffrroonntt ccoonnttrroolllleerr ppaanneell..

NOTE: The following procedures describe the control and reading of the transmitter parameters using the System Controller front panel pushbutton switches. The laptop remote application software may be used instead to control and read the parameters

6. Turn OFF the non-broadcasting (standby) transmitter: For a 300 or 1000 watt dual transmitter system, using the NG300/NG1000 System Controller front panel, press the BACK pushbutton as necessary then the SELECT pushbutton until the Main Menu is displayed. Using the UP or DOWN pushbuttons, align the arrow (>) with Control, then press the SELECT button. From the Control menu, use UP or DOWN to align the arrow

A-15 5/6/11 with Standby TX On/Off and press SELECT then use UP or DOWN until the arrow (>) is aligned with Off, then press SELECT to turn the standby transmitter OFF.

7. Turn OFF the power switches in the back of power amplifier chassis of the non-broadcasting transmitter (the Nautel controller External Alarm red LED for that transmitter will turn on).

8. Locate the appropriate circuit breaker in the NWR transmitter main electrical panel box, and then turn the circuit breaker for the transmitter to be cleaned to the OFF position.

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

(Refer to Section 3 in the Nautel NG300/NG1000 Operations and Maintenance 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 lint-less cloth moistened with rubbing alcohol. Dry with a clean, lint-less cloth.

b. There is one filter for each of the RF power amplifier panels. To clean or replace:

Remove the front panel grill section by removing the four captive M4 hex screws using the HY88 hex tool from the ancillary kit (do not try to pull out the screws from the grill or the captive washers will fall out – they are not held in very firmly).

Temporarily remove the PVC retaining plate from the grill section then remove the old filter. Vacuum the filter (or, if possible, rinse with water) and both sides of the filter grill. If unable to clean properly or if the filter is damaged, replace the filters.

Replacement filters are available from the national maintenance contractor using the following part numbers:

• For Model NG300: HAM74

• For Model NG1000: HAM75 (Nautel) or Universal Air Filter, 25 PPI Quadrafoam Media, Black

c. Re-install the air filters, PVC retaining plate, and front grill (the grill is not reversible and only fits in one way).

d. If in an extremely dirty environment, for the non-broadcasting transmitter, first ensure the transmitter and circuit breakers are OFF. Disconnect the power control and any other cables from the back of the chassis, pull out the chassis from the rack, remove the top cover plate (16 screws) 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. The fans inside the chassis need to be cleaned at least once a year.

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.

Remove the front panel grill of the broadcasting transmitter (see step {1}b) and make sure all the cooling fans (6 in the 1000W, 3 in the 300W, plus one in the front upper left side) of the broadcasting transmitter are operating properly and not abnormally noisy (may need to use a flashlight). Record the location of any failed or defective fans in Attachment E.

5/6/11 A-16

{3} Check AC Input Voltage, AC Surge Protectors, Lamps, LEDs, Readouts/Displays, and ROAMS Battery Date Check the AC input voltage by using a multi-meter to measure at the bottom terminals in the back of the cabinet. Remove the rear cabinet cover and measure voltage between L1 and L2 on both TB1 chassis. Depending on the transmitter model and type of power supplied, the input voltage should be 115 VAC ± 10%, 208 VAC ± 10% (three phase), or 230 VAC ± 10% (single phase). Contact the site line power point of contact if outside the ± 10% range.

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 LEDs and LCD displays of 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 Verification

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

g. Turn off the broadcasting transmitter prior to attaching an external power meter:

On the NG300/NG1000 System Controller front panel, push in the red RF OFF pushbutton switch. The green LED on the RF ON pushbutton switch will turn off.

h. Turn OFF the power switches in the back of both the power amplifier chassis -the transmitter that had been broadcasting and the standby.

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

j. Carefully remove the antenna transmission line from the cavity RF directional coupler 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 the next step.

k. Install the appropriate calibrated external power meter, ddiirreeccttiioonnaall ccoouupplleerr,, oorr ppoowweerr sseennssoorr (use appropriate element for a Bird 43 - 500W element for NG300, 1000W element for NG1000) 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

A-17 5/6/11 ttoo pprreevveenntt tthhee hheelliiaaxx ffrroomm bbeennddiinngg.. TThhee pprrooppeerr ccaabbllee lleennggtthh iiss nneecceessssaarryy ttoo mmaaiinnttaaiinn aanntteennnnaa ccaabbllee pphhaassiinngg))..

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

m. On the transmitter that had been broadcasting, turn ON the power switches in the back of the power amplifier chassis.

n. Using the System Controller front panel, press the BACK pushbutton as necessary then the SELECT pushbutton until the Main Menu is displayed. Using the UP or DOWN pushbuttons, align the arrow (>) with Control, then press SELECT. Use UP or DOWN buttons to point to Set Active TX then press SELECT. Use UP or DOWN buttons to point to TXA or TXB and press SELECT to turn ON the transmitter that had been broadcasting.

o. On the System Controller panel, push in the RF ON pushbutton switch. The green LED on the RF ON pushbutton switch will be lit and either the Transmitter A (TXA) or Transmitter B (TXB) green LED will be lit.

pp.. Record the forward power value from the external power meter in Attachment E. IIff tthhee ffoorrwwaarrdd ppoowweerr iiss oouuttssiiddee ±± 1100%% ooff tthhee nnoorrmmaall ooppeerraattiinngg ppoowweerr,, ccoorrrreeccttiivvee aaccttiioonn mmuusstt bbee ttaakkeenn oorr iiff sslliigghhttllyy oouuttssiiddee tthhee ttoolleerraannccee,, aaddjjuusstt tthhee ffoorrwwaarrdd ppoowweerr.. SSeeee sstteepp ““ll”” bbeellooww ttoo aaddjjuusstt tthhee ffoorrwwaarrdd ppoowweerr..

q. For Bird 43 Wattmeter only: Note the position of the arrow direction of the power element currently installed in the wattmeter (used to measure the forward power).

Remove that element and replace it with a 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. For other wattmeters, switch to Reflected power setting. 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.

r. Observe the Fwd/Rfl Power on the System Controller Vacuum Florescent Display (VFD) for the active transmitter (TXA or TXB). NNoottee tthhaatt tthhee ssccaalliinngg ffaaccttoorr iiss nnoorrmmaallllyy 11..0000 aanndd tthhaatt aannyy cchhaannggee ttoo tthhiiss wwiillll aaffffeecctt tthhee oouuttppuutt ppoowweerr lleevveell. If necessary, adjust the forward power as follows: press SELECT (or BACK if necessary) to get to the Main Menu. Use UP and DOWN buttons to point to Control and push SELECT then use UP and DOWN buttons to point to System Fwd Power and push SELECT. Use UP and DOWN buttons to increase or decrease the power setting (in 1 W steps). Note that an increase or decrease from the previously stored value will cause an asterisk to appear at the end of the screen’s top line. Press SELECT to confirm the setting. Press BACK to read the Fwd/Rfl Power on the Controller Display. Compare the reading with that of the external wattmeter. Determine the cause of any differences in the readings. Record the final forward and reflected power values in Attachment E (and the site log).

s. Using the laptop with the Remote Control Software, click on the SYSTEM tab and note the FORWARD POWER and REFLECTED POWER readings. The Nautel NG300 and NG1000 manual show examples of the laptop display when monitoring the transmitter. Record the values for forward and reverse power in Attachment E and compare with the front panel reading.

5/6/11 A-18

{5} Transmitter Exciter/Power Amplifier Supply Voltage and Current Verification On the System Interface front panel, press SELECT (or BACK if necessary) then the UP or DOWN buttons until the arrow points to Meters on the LCD screen. Press the SELECT pushbutton. Under the Meters menu press SELECT to choose TXA or TXB. Use the UP and DOWN pushbuttons to scroll through and show the power amplifier voltage and currents for TXA or TXB (PA Volts, PA1 Current, PA2 Current). Record the values in Attachment E. On the laptop, select the TXA Meters or TXB Meters tab to obtain the power amplifier supply voltage and current. Record the laptop readings in Attachment E and compare with the front panel readings.

{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 initial carrier frequency reading in Attachment E. If more than 500 Hz off assigned carrier frequency, perform corrective action below.

DO NOT proceed with this fine frequency adjustment without a properly calibrated Communications Analyzer or Frequency Counter. To perform a fine adjustment of the carrier frequency: From the Main Menu, press SELECT button then use the UP and DOWN buttons to point to Control and push SELECT. From the Control menu use the UP and DOWN buttons to point to Carrier Trim and press SELECT. Use the UP and DOWN buttons to adjust the proper carrier trim (in Hz) to get back to the proper carrier frequency.

If using a laptop with the Nautel NG software, click the Calibration tab, then select Carrier Trim by clicking on the “…” box next to the trim value. Increase or decrease the Carrier Trim up or down as necessary by typing in the new value, then click Apply. Check to see if the frequency error is within the above limits. If not, repeat. Record the final carrier frequency reading in Attachment E.

{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. 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 Level Calibration and Verification”, if maintenance on both transmitters has been completed or if completed on a single transmitter installation.

A-19 5/6/11

A.2.2 Repeat Maintenance for Backup Transmitter

1. For the non-broadcasting transmitter, switch the circuit breaker for that transmitter to the

ON position.

2. On the non-broadcasting transmitter, turn ON the power switches in the back of Power Amplifier chassis.

3. Using the System Controller front panel, press the BACK pushbutton as necessary then the SELECT pushbutton until the Main Menu is displayed. Using the UP or DOWN pushbuttons, align the arrow (>) with Control, then press the SELECT button. From the Control menu, use UP and Down buttons to align the arrow with Set Active Tx and press SELECT. Use the UP and DOWN buttons to point the arrow to TXA or TXB as appropriate (whichever transmitter that was not previously broadcasting). Press the SELECT pushbutton to confirm the change. The transmitter that had not been broadcasting should now be on.

4. Turn OFF the non-broadcasting (standby) transmitter: Press the BACK pushbutton as necessary then the SELECT pushbutton until the Main Menu is displayed. Using the UP or DOWN pushbuttons, align the arrow (>) with Control, then press the SELECT button.

From the Control menu, using the UP or DOWN pushbutton, align the arrow (>) with “Standby TX On/Off”, then press the SELECT button. Move the UP or DOWN pushbutton until the arrow (>) is aligned with Off, then press SELECT to turn the standby transmitter OFF. The previously broadcasting transmitter should now be OFF.

5. For the transmitter that had been broadcasting, turn OFF the power switches to the Power Amplifier chassis.

6. Locate the appropriate circuit breaker in the NWR transmitter main electrical panel box, and then turn the circuit breaker for the transmitter to be cleaned to the OFF position.

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

{8} Transmitter Audio Input Level Verifications

a. Turn off the primary and backup transmitter: On the System Controller panel, push in the red RF OFF pushbutton switch. The green LED on the RF ON pushbutton switch will turn off.

b. On the broadcasting transmitter, turn OFF the power switch to the Power Amplifiers.

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

d. 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.

e. On the primary and backup transmitters, turn ON the transmitter circuit breaker panel switches.

f. Turn ON all the power switches to both the Power Amplifiers.

NOTE: 1. The transmitter should still be in LOCAL control (red LOCAL LED on).

5/6/11 A-20

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.

gg.. 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 SSEELL……..SSEENNDD 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 00..227755 aanndd 00..221188 vvoollttss (( --99..00 ttoo --1111 ddBBmm))..

NNOOTTEE:: SSoommee ttrraannssmmiitttteerrss ddoo nnoott hhaavvee aa ttrruuee 660000 OOhhmm llooaadd;; tthheerreeffoorree,, vvaarriiaattiioonnss ooff aaccttuuaall lleevveellss ooccccuurr.. LLeevveellss ffrroomm --99..00 ttoo --1111 ddBBmm aarree aacccceeppttaabbllee.. BBeeccaauussee ooff tthhiiss,, tthhee lleevveellss aatt tthhee aauuddiioo ssoouurrccee mmaayy vvaarryy ddeeppeennddiinngg oonn tthhee aaccttuuaall aauuddiioo llooaadd ooff tthhee ttrraannssmmiitttteerr..

1144)) IIff oouuttppuutt ddooeess nnoott sseeeemm ccoorrrreecctt,, ppeerrffoorrmm tthhee ffoolllloowwiinngg sstteeppss ttoo vveerriiffyy tthhee AAMM--4488 iiss oouuttppuuttttiinngg tthhee ccoorrrreecctt lleevveell::

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

ii. On the AM-48, connect the GRN to YEL and the RED to BLK. This ties the TX and RX together and loops the audio back into the AM-48.

iii. Set TERM/BRIDGE to TERM. This supplies a calibrated 600 Ohm load.

iv. Set the following :

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

A-21 5/6/11

ABS/REL/SEND to SEND

SEL….SEND section to 1004

v. The display should read 1004 -10.0.

vi. Using the RMS multimeter, measure across the GRN/YEL and RED/BLK – it should read 245 mVAC RMS.

vii. Further verification can be seen by changing the MON SND/MON REC/TALK to MON SND and then MON RCV. The AM-48 indication will show 1004 -10.0 in both positions. The indication shows the AM-48 is putting in the correct level for a TRUE 600 ohm load.

viii. If any settings were changed to verify the AM-48 ouput, restore the AM-48 to provide the -10 dBm output into the transmitter.

1155)) UUssiinngg tthhee SSyysstteemm CCoonnttrroolllleerr ffrroonntt ppaanneell,, pprreessss tthhee BBAACCKK ppuusshhbbuuttttoonn aass nneecceessssaarryy tthheenn tthhee SSEELLEECCTT ppuusshhbbuuttttoonn uunnttiill tthhee MMaaiinn MMeennuu iiss ddiissppllaayyeedd.. UUssiinngg tthhee UUPP oorr DDOOWWNN ppuusshhbbuuttttoonnss,, aalliiggnn tthhee aarrrrooww ((>>)) wwiitthh CCoonnttrrooll,, tthheenn pprreessss tthhee SSEELLEECCTT bbuuttttoonn.. UUssee UUPP oorr DDOOWWNN aanndd SSEELLEECCTT SSeett AAccttiivvee TTXX tthheenn uussee UUPP oorr DDOOWWNN aanndd SSEELLEECCTT TTXXAA oorr TTXXBB ttoo ttuurrnn OONN tthhee ttrraannssmmiitttteerr tthhaatt hhaadd bbeeeenn bbrrooaaddccaassttiinngg..

1166)) OOnn tthhee SSyysstteemm CCoonnttrroolllleerr ppaanneell,, ppuusshh iinn tthhee RRFF OONN ppuusshhbbuuttttoonn sswwiittcchh.. TThhee ggrreeeenn LLEEDD oonn tthhee RRFF OONN ppuusshhbbuuttttoonn sswwiittcchh wwiillll bbee lliitt aanndd eeiitthheerr tthhee TTrraannssmmiitttteerr AA ((TTXXAA)) oorr TTrraannssmmiitttteerr BB ((TTXXBB)) LLEEDD uunnddeerr ““AAllaarrmm//SSttaattuuss”” wwiillll bbee lliitt ggrreeeenn..

1177)) 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..

1188)) TToo aaddjjuusstt tthhee NNaauutteell NNGG RReemmoottee AApppplliiccaattiioonn TTXX AA ((oorr TTXX BB ))MMaaiinn AAuuddiioo IInnppuutt ddiissppllaayy ttoo mmaattcchh tthhee iinnppuutt lleevveell ffrroomm tthhee AAMM--4488,, ppeerrffoorrmm tthhee ffoolllloowwiinngg::

ii.. In the NG Remote software, select the Calibration tab, then compare the TX A Main Audio Input level to the level measured on the AM-48.

ii. Change TXA Main Audio Input to match the audio input level measured with the AM-48 by clicking on the … button. Type the amount and select APPLY.

iii. In the NG Remote software, compare the TX B Main Audio Input level to the level measured on the AM-48.

iv. Change TXB Main Audio Input to match the audio input level measured with the AM-48 by clicking on the … button. Type the amount and select APPLY.

1199)) OOnn tthhee SSyysstteemm CCoonnttrroolllleerr ffrroonntt ppaanneell,, ppuusshh iinn tthhee rreedd RRFF OOFFFF ppuusshhbbuuttttoonn sswwiittcchh ttoo ttuurrnn ooffff tthhee bbrrooaaddccaassttiinngg ttrraannssmmiitttteerr..

2200)) DDiissccoonnnneecctt tthhee AAMM--4488 ffrroomm tthhee ssuupppprreessssoorr aanndd rreeccoonnnneecctt tthhee NNWWRR aauuddiioo ffeeeedd ffrroomm tthhee WWFFOO..