Inovonics 525N Installation & User Manual
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Inovonics 525N, — — 32 SNMP Security SNMP ‘Communities’ serve as passwords for security . Go into the Read Community: and Write Community: boxes to enter text that is specified for the read/write strings on the SNMP Manag- er monitoring device. SNMP Traps When the 525N initiates an alarm, rather than being qu e ried or polled for one, the alarm is known as a ‘trap.’ You may enter three local network IP addresses as Trap Destinations, each cor- responding to other devices on the LAN that want to be ap- prised of alarms. SNMP Ports The default SNMP Port
— — 20 +125% of the resting carrier value. AM broadcasting is unique in supporting a certain degree of asymmetry in the modulating waveform, and the United States FCC, as well as many interna- tional broadcast authorities, permit positive peak excursions to reach this +125% limit. A station is said to overmodulate if negative or positive peaks
— — 24 selected audio cutoff options have no effect on modulation measurements. Navigate to the SET OPTIONS screen, No. 3. SEL buttons will navigate the flashing brackets to the current AUDIO CUT: set- ting, and MENU/EDIT buttons may be used to set the audio cut- off to FLAT, or in 1kHz increments from 10kHz down to 2kHz. Figure 2 on Page 7 plots the family of
Inovonics 525N, — — 15 With the exception of the SIGNAL AND NOISE measurement, all menu screens automatically return to show PEAK MODULA- TION after a 60-second timeout period. Using the Front-Panel Buttons M etering and setup options use the diamond cluster of four pushbuttons in conjunction with the LCD screen. The MENU/EDIT buttons initially scroll up and down among the display screens and setup menus. In an editable menu (one where changes may be made), the left/right SEL (select) but- tons can then highlight a particular option with blinking brackets, as shown here for the NRSC DE-EMPH: selection. Bracketed options are then be �
Inovonics 525N, — — 43 Alarm Log Capacity Status: is a notation of how full the log is at the moment. Al t- hough the log is capable of containing a couple of thousand events, it might be important to know when you have accumu- lated a certain number of entries. So the Email when % full: slider sets-up an independent email notification to everyone when the alarm log reaches the set point. This email notifica- tion can be an alert to a frequently-recurring problem, or simp- ly serve as a reminder to downloaded and clear the log.
Inovonics 525N, — — 17 cidental retuning by some clumsy person bumping against the rack. READING MODULATION The No. 1 PEAK MODULATION screen displays total carrier modulation in the active display area. The two bargraphs show positive and negative modulation in- dependently and concurrently. The bargraphs follow the modulation envelope, and single segments representing the highest positive and negative peaks ‘hang’ above the bars for a second or so to ensure that the highest instantaneous value will be displayed with no ambiguity. Setup of the peak flashers is covered later in this section. This total-mod display has 1%
Inovonics 525N, — — 33 Recipient 1: and Recipient 2: in this example are the SMS/text message and email addresses, respectively, for the station’s Chief Engineer. Other recipients could be a contract engineer firm or station management. How alerts are assigned among these recipients is covered on Page 40. Saving and Testing When this utili ty has been set up, click: Save at the bottom of the page to commit this information to memory. You may also click: Send test Email to immediately dispatch a confirming test message to all recipients. TIMEKEEPING Open the Time & Time Zone Web screen to set up the internal timekeeping function of the 525N. Correct timek
Inovonics 525N, — — 3 TIMEKEEPING ................................................................................. 33 ADMINISTRATIVE SETTINGS ........................................................ 34 Password Lost Password Hard Reset The Hardware Profile Errata Section V – USING THE WEB INTERFACE MISCELLANEOUS SETTINGS ......................................................... 36 Audio Options Secondary Peak Flashers Channel Spacing Alarm Closure Polarity THE WEB SCREEN HEADER .......................................................... 37 Remote Listening Listen-Only Shortcuts Signal Quality Peak Flashers NOW PLAYING ..................................
Inovonics 525N, — — 30 need) are often free of charge, but advanced features may command a nominal annual fee. All services require registra- tion on the appropriate Website. Click Dynamic DNS on the 525N Menu. The dynamic DNS function is shown Disabled, but if you click inside that dark area a list of the three popular providers will pop down as shown in the inset. Jot down these provider names and enter each in your Web browser to learn more about their services, and to register with whichever provider seems best to m
Inovonics 525N, — — 35 The Hardware Profile The entire 525N setup, which includes the Preset Stations list, receiver setup choices, hardware options, alarm setup and no- tification preferences and SNMP options, may be saved to your computer as a small text file. The Hardware Profile is useful for restoring a previous mod- monitor setup or for ‘cloning’ a loaner or a second unit for backup service. Click: Download Hardware Profile to save the profile to your system. Depending on your browser and ver- sion, the file will normally be saved to a Downloads folder un- less you are asked for a specific ‘save to’ location. The file has a default name of 525Nsettings
Inovonics 525N, — — 27 SEL buttons shuffle the brackets among the address number group ‘octets.’ In the example, the second octet is bracketed. MENU/EDIT buttons can then cycle the entry to any number be- tween 0 and 255. (Holding the button down cycles quickly through the 8-bit sequence.) Gateway, Subnet Mask and Primary DNS The next three menus, Nos. 10, 11 and 12 allow manual setup of NETWORK: GATEWAY, NETWORK: SUBNET and NETWORK: DNS . Just as with entering a static IP address, when the 525N is as- signed an IP address, DHCP: ON , these menus are locked out. Only with DHCP: OFF can values
— — 44 Section VI UPDATING THE 525N THE FIRMWARE UPDATER The 525N hosts two operating files that are easily updated in the field. These files are the primary firmware, which controls the functions, memories and Web interface of the unit, and the individual Web pages that comprise the Web interface screens. The 525N includes a ‘bootloader’ utility
Inovonics 525N, Installation & Operation User Guide 525N AM Modulation Monitor with Networking February, 2016 Firmware Rev. 1.0.0.0 Inovonics, Inc. 5805 Highway 9 Felton, CA 95018 Tel: (831) 458-0552 Fax: (831) 458-0554 Register online at www.inovonicsbroadcast.com PRODUCT REGISTRATION RECORD 525N – Serial No. __________________ Purchase Date _____________________ Warranty Registered? Web Reg. Date __________ By: ____________
Inovonics 525N, — — 40 Click in the dark area at the bottom-right of the window to se- lect history periods of ten seconds, one minute or ten minutes as shown in the inset. Click Clear at any time to start a fresh graph. The Meter History plot may be saved as an image file using the computer’s Prt Scr utility or any popular ‘screen snipping’ tool. ALARMS AND NOTIFICATIONS Overmod Alarm The Overmod alarm reflects the trigger criteria described under its local, front-panel setup beginning on Page 19.
Inovonics 525N, — — 21 condition used by the Web interface to dispatch text-message or email notifications to specific recipients. (This notification procedure is explained on Page 40.) The rear-panel tally closure, on the other hand, can either fol- low the alarm criteria just described, or it can respond instan- taneously to either red LED front-panel flasher. (If, for exam- ple, you wanted to have a remote flasher in your office.) Use the SEL buttons to bracket CLOSURE:, and then set it either to ALARM or to PEAK FLASHER with the MENU/ED
Inovonics 525N, — — 46 Next, click: Find All Devic- es at the top of the Firmware Update win- dow. The IP address of the 525N should popu- late the Select: area, and a Confirm box will pop-up on the screen as well. The Confirm box is a ‘watchdog’ feature in- cluded in the third-party bootloader utility, but it is not relevant to the 525N update procedure. Click: No in the Confirm box to close it, and then click: Program at the top of the window. Finally click: Program in the drop-down list. The update utility wil
Inovonics 525N, — — 34 Be sure to click: Save at the bottom of the window to commit you timekeeping setup to memory. ADMINISTRATIVE SETTINGS Password The Admin Web screen all ows you to set up a password for the 525N. Simply type the password into the Password: field, click: Save, and then click: Enable. You’ll be immediately prompted with a pop-up window asking for a User Name: and Password: . The User Name: is optional and may be left blank; it is not used with any other 525N function at this time. Just enter your new password in the Password: field. This pop-up will greet you each time you launch the 525N Web pages.
Inovonics 525N, — — 25 A solid, strong incoming carrier, preferably 40dBuV or more, will usually guarantee adequate SNR for accurate modulation readings. But even a strong signal can be sabotaged by co- channel ‘skip’ after daylight hours. Watch for a ‘beat’ on the RSSI display and listen for an intruding program at the re- ceived frequency. A strong adjacent-channel signal can also skew peak modula- tion readings. The 525N is, after all, a very wideband receiver. Although synchronous detection should reject an adjacent channel, the 525N compromises this feat
— — 42 Repeat this exercise for other potential recipients; each can re- ceive just those alerts or logs pertinent to their responsibili- ties. The Alarm Log The 525N logs all alarms. Pull - up the Alarm Log by clic k ing the + next to Alarm Log at the bottom of the screen. A sample log is shown on the next page. Read the Alarm Log from the botto
Inovonics 525N, — — 7 RECEPTION SNR AND AUDIO RESPONSE GRAPHS Figure 1 plots the program audio output noise floor against the RF level at the antenna connector. Signal-to-noise performance of the 525N is a direct function of the incoming RF level. The figures shown reference 100% mod- ulation with 10kHz audio bandwidth and NRSC de-emphasis. Figure 1 - Model 525N SNR Performance Figure 2 illustrates the effect of the menu-programmable audio-cut filter in the program audio and headphone outputs of the Model 525N. This filter does not affect modulation measurements, which always follow the FLAT response noted, regardless of the
Inovonics 525N, — — 8 BLOCK DIAGRAM Figure 4 - Block Diagram, Inovonics Model 525N HIGH LEVEL RF INPUT CARRIER RECOVERY LIMITER I O LOOP ANTENNA TUNED RF AMP TUNED RF AMP SYNTHESIZED LOCAL OSC. FIRST IF AMP SECOND IF AMP 15kHz LPF & PHASE COMP. VARIABLE LOW-PASS NRSC DE-EMPH PROGRAM AUDIO OUT CARRIER- LEVEL INTEGRATOR AGC AMP NEGATIVE PEAK DETECTOR POSITIVE PEAK DETECTOR NOISE AMP MCU MICRO- CONTROL
Inovonics 525N, — — 29 entered exactly as shown on the Hostname: line, and followed by a forward slash like this: MODEL525N/ so that the browser won’t default to a DNS search. Using the Hostname obviates having to check the IP address before connecting, and unique names can help identify and manage multiple 525Ns on a net- work. The HTTP Port: has a default value of 80. This is a common as- signment, but one reason it might need to change is if you have more than one 525N on your network. Your IT depart- ment
Inovonics 525N, — — 19 splatter or similar spillover from an adjacent station, or even modulation from a distant station on the same frequency. Noise is quantified on an arbitrary numerical scale of zero to nine with the bargraph scaled proportionally. Anything over a value of 2 gives reason to suspect the accuracy of modulation measurement. Aiming the antenna away from an offending source may help reduce the noise contribution. Metered noise is not the only non-program component that can sabotage modulation readings. Impulse noise
— — 11 mains connector on the rear panel. The inappropriat e voltage and fuse value will have been lined-out at the factory with a felt marker pen. To change the mains voltage, disconnect power and remove the top cover of the unit. A clearly marked slide switch is directly behind the AC mains connector on the circuit board. With the unit unplugged, use a sma
Inovonics 525N, INOVONICS WARRANTY I TERMS OF SALE: Inovonics products are sold with an understand- ing of “full satisfaction”; that is, full credit or refund will be issued for products sold as new if returned to the point of purchase within 30 days following their receipt, provided that they are returned com- plete and in an “as received” condition. II CONDITIONS OF WARRANTY: The following terms apply unless amended in writing by Inovonics, Inc. A. The Warranty Registration Card supplied with this product must be completed and returned to Inovonics, or the Warranty regis- tered online at www.inovon.com, within 10 days of delivery. B. T
Inovonics 525N, — — 1 TABLE OF CONTENTS Section I - INTRODUCTION MODEL 525N PRODUCT DESCRIPTION ......................................... 5 General Features MODEL 525N TECHNICAL SPECIFICATIONS ................................. 6 RECEPTION SNR AND AUDIO RESPONSE GRAPHS .................... 7 BLOCK DIAGRAM .............................................................................. 8 Section II - INSTALLATION UNPACKING AND INSPECTION ...................................................... 9 THE LOOP ANTENNA ...............
Inovonics 525N, — — 5 Section I INTRODUCTION MODEL 525N PRODUCT DESCRIPTION General The Model 525N is a n AM Modulation Mo n itor for monitoring and measuring transmission performance in the medium-wave AM broadcast band. Off-air reception allows measurements to include the antenna and its phasing and tuning circuits. The 525N is a broadband receiver featuring wide audio re- sponse with user-selectable audio-monitor bandwidth charac- teristics. A phase-locked synchronous detector helps reject ad- jacent-channel interference and recovers only the amplitude- modulated component of HD Radio™ ‘hybrid-digital’
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