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Inovonics 525N Installation & User Manual

Am modulation monitor with networking
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Summary of Contents for Inovonics 525N

  • Page 1 525N...
  • Page 3 525N...

  • Page 5: Table Of Contents

    TABLE OF CONTENTS Section I - INTRODUCTION MODEL 525N PRODUCT DESCRIPTION ......... General Features MODEL 525N TECHNICAL SPECIFICATIONS ......... RECEPTION SNR AND AUDIO RESPONSE GRAPHS ....BLOCK DIAGRAM ................Section II - INSTALLATION UNPACKING AND INSPECTION ............THE LOOP ANTENNA ...............
  • Page 6 AUDIO MONITOR SETTINGS ............Audio Bandwidth Selection NRSC De-Emphasis RECEPTION AND MEASUREMENT CONSIDERATIONS ....Performance Limitations Section IV – NETWORK SETUP CONNECTING WITH THE 525N ............Connect the 525N DHCP Entering a Static IP Address Gateway, Subnet Mask and Primary DNS HOOKING-UP ..................
  • Page 7 Audio Loss and Low Signal Alarms Email Notifications The Alarm Log Alarm Log Capacity Downloading and Clearing the Alarm Log Section VI – UPDATING THE 525N THE FIRMWARE UPDATER ............Warning Firmware Update Files Running the Firmware Updater Updating the Web Interface Pages APPENDIX INOVONICS WARRANTY ........
  • Page 8 — —...

  • Page 9: Section I - Introduction

    Section I INTRODUCTION MODEL 525N PRODUCT DESCRIPTION The Model 525N is an AM Modulation Monitor for monitoring General 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.

  • Page 10: Model 525N Technical Specifications

    Supplied with a weatherproof, large-aperture loop an- tenna. MODEL 525N TECHNICAL SPECIFICATIONS Receiver Topology: between 50% and 100% (negative) and 50% and 140% (positive) modulation, and 2% be- Single-conversion superheterodyne;...

  • Page 11: Reception Snr And Audio Response Graphs

    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 audio cutoff selected.

  • Page 12: Block Diagram

    DE-EMPH COMP. AGC AMP CARRIER- CARRIER LEVEL RECOVERY INTEGRATOR LIMITER POSITIVE PEAK DETECTOR NOISE AMP NEGATIVE PEAK DETECTOR PORT MICRO- CONTROLLER ALARM OUTPUT SECTION TALLIES DRIVERS PANEL CONTROLS AND READOUTS Figure 4 - Block Diagram, Inovonics Model 525N — —...

  • Page 13: Section Ii - Installation

    Your own common sense and experience with wind, ice and other nasties should be factored into location and mounting considerations. Cable to connect the antenna to the Model 525N is not provid- Cable ed. Cabling can be any ready-made RG-6 CATV coax of 100 feet Not Included or less with F connectors on both ends.

  • Page 14: Mounting The 525N

    We recommend rack screws with built-in plastic washers to protect the painted finish around the mounting holes. Consuming far less power than a ‘60s LavaLite®, the 525N gen- Heat Dissipation erates negligible heat itself. The unit is specified for operation within an ambient temperature range extending from freezing to 120°F/50°C.

  • Page 15: Power Cord

    You can remove the factory fuse indication with solvent, and then cross out the inappropriate fuse value with a felt marker. The detachable IEC-type power cord supplied with the 525N is Power Cord fitted with a North-American-standard male plug. If you need to replace the mains plug with another, you will find that the individual cord conductors are color-coded in one of two ways.

  • Page 16: Antenna Input

    If the 525N is co-located with the transmitter, but a direct con- nection to an appropriate tap is not convenient, chances are that a short length of insulated wire stuck into the center of the F connector will bring sufficient signal into the 525N.

  • Page 17: Alarm Closure Polarity

    The local alarm tallies are collectors of NPN transistors that saturate to ground. These outputs can sink up to 100mA at source voltages to 30VDC. +5V and GND (ground) are provided on the terminal strip as well. The +5V source is current- limited to about 50mA, which is sufficient to drive an opto- coupler or a remote LED indicator.

  • Page 18: Section Iii - Basic Setup And Operation

    Instructions in this Section cover initial setup of the 525N us- ing the front-panel buttons and LCD display. Anything that can be done from the front panel of the 525N may also be accomplished using the Web interface. Web setup, offers greater convenience, plus a few additional features and measurement options.

  • Page 19: The Menu Tree

    MENU/EDIT buttons will again scroll through the screens. Bracketed options that have been changed are transferred into 525N memory when the brackets are removed, or after a 30- second timeout returns the PEAK MODULATION screen. Low signal and audio-loss fault conditions will trigger flashing...

  • Page 20: Tuning

    Up to five stations may be entered into non-volatile memory Tuning Presets for instant recall. Station preset buttons will tune the 525N regardless of what screen is showing. To set the front-panel buttons, simply tune the 525N to the desired frequency and then hold down one of the buttons in the STATION PRESETS group.

  • Page 21: Reading Modulation

    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’...

  • Page 22: Monitoring Interference

    With incoming RF levels below 10dBuV, the LCD displays RSSI:LO. AGC action within the 525N can deal with inputs up to 100dBuV. When the AGC reaches this end of its control range, HI replaces the numerical value and OVERLOAD appears to the right of the bar, as shown here.

  • Page 23: Setting The Peak Flashers

    SETTING THE PEAK FLASHERS The 525N has two sets of front-panel LED peak flashers to show overmodulation. The larger top and bottom red LEDs indicate the absolute US (and some other coutries’) legal limits of –100% and +125% modulation.
  • Page 24 A station is said to overmodulate if negative or positive peaks reach these limits “recurrently,” meaning that every now and then is okay, but don’t make a habit of it. The 525N has a user-programmable provision for ‘weighting’ overmodulation. Excursions to the the legal limits are inte- grated so that an alarm is not generated instantaneously.

  • Page 25: Setting The Low Signal Alarm

    525N and your transmitter site. Also, be sure to keep the TRIP LEVEL: above residual noise at the receive fre- quency when the carrier is off.

  • Page 26: Alarm On/Off Timing

    Settings here pertain to the station that is normally monitored and are probably not the right settings for other stations when the 525N is used to monitor market companions. When surf- ing the band or “DXing,” it may be necessary to temporarily re- set alarms to absurd values to keep them from activating un- necessarily.

  • Page 27: Setting Alarm Tally Closure Polarity

    IF frequency of zero. Overall receiver bandwidth is thus defined in large part by au- dio filtering that follows the detector. The range of 525N audio cutoff characteristics permits listening to the program as it might sound with different transmission audio filtering, or from the perspective of the wide variety of radios that exist in the marketplace.

  • Page 28: Nrsc De-Emphasis

    RF noise. The 525N allows de-emphasis to be selected from the front panel for any of the audio cutoff settings, except for the FLAT position that automatically defeats de-emphasis.

  • Page 29: Performance Limitations

    AM radios, in that it wants to lock onto a strong, clean carrier, even if that carrier is a channel or more away! The principal utility of the 525N is its use as a Modulation Mon- itor, not as a hotshot receiver with razor-sharp tuning. Alt-...

  • Page 30: Section Iv - Network Setup

    Connect with your network. Connect the RJ45 NETWORK PORT jack on the 525N the back of the 525N to a LAN port of your server or router. Use MENU/EDIT buttons to navigate to Menu No. 8, NETWORK: DHCP DHCP. SEL buttons will bracket the status of this menu, which then may be toggled between ON and OFF using MENU/EDIT buttons.

  • Page 31: Gateway, Subnet Mask And Primary Dns

    With both the 525N and a computer connected to a common network (LAN or Internet), bring up a browser window and en- ter the IP address of your 525N as shown in Menu No. 9. In short order you should see the main Now Playing Webpage on...

  • Page 32: Completing The Network Setup

    COMPLETING THE NETWORK SETUP Before we get to the useful aspects of the 525N Web interface, let’s first finish-up with the remaining networking setup items. These are quite simple under Web interface control.

  • Page 33: Accessing The 525N Remotely

    DHCP range. This should be an easy matter with the aid of the router’s Help utility (let your IT department help here). You also need to open a specific port for the 525N on the net- work router. Within the router’s Port Forwarding utility you will be able to enter your static IP address for the unit (Internal IP), followed by a colon and a port number.

  • Page 34: Snmp Operation

    Go back to the box above and click on the provider you have chosen. Then type the setup information right onto the screen and click Save. This will allow you to access your 525N operat- ing under a dynamic IP address.

  • Page 35: Network: Ip

    On the 525N Menu tree, click SNMP to bring up the window shown here. The default mode for SNMP is Disabled, which inhibits commu- nication between the 525N and the SNMP Manager. Clicking in the dark Disabled area drops-down the operating choices shown in the inset.

  • Page 36: Snmp Security

    SNMP Manag- er monitoring device. When the 525N initiates an alarm, rather than being queried or SNMP Traps polled for one, the alarm is known as a ‘trap.’ You may enter...

  • Page 37: Saving And Testing

    TIMEKEEPING Open the Time & Time Zone Web screen to set up the internal timekeeping function of the 525N. Correct timekeeping is es- sential for tagging alarm notifications and for useful Alarm Log listings. Select your offset from Universal Coordinated Time using the Time Zone (Hours): slider.

  • Page 38: Administrative Settings

    If you lose or forget your password, you must perform a ‘hard Lost Password reset’ on the 525N. A hard reset purges all setup and other in- formation from memory. To obviate the inconvenience of ever having to do a complete setup all over again, we recommend periodically downloading and saving a Hardware Profile.

  • Page 39: The Hardware Profile

    ‘save to’ location. The file has a default name of 525Nsettings.ini. To upload a saved Hardware Profile to your 525N, bring up the Admin page and click: Browse… to locate the saved profile on your computer.

  • Page 40: Section V - Using The Web Interface

    USING THE WEB INTERFACE This section introduces the Web interface pages used in every- day operation of the 525N monitor. Operational details of the product that were covered in Section III, dealing with front- panel setup of the unit, will not be repeated here in depth. In- stead, page numbers from the earlier discussions will be cited in lieu of presenting the detailed information redundantly.

  • Page 41: The Web Screen Header

    Keep in mind that the audio will lag the total-mod metering. You can listen to the streaming audio from your 525N without Listen-Only bringing Web pages up onto a screen. This involves entering...

  • Page 42: Now Playing

    (see Pages 19 – 23). These alarms trigger tally outputs, text-message/email alerts and SNMP traps, and are logged by the 525N. These indi- cators respond identically to the front-panel flashing alarms. The balance of this Web screen is used for receiver tuning and Receiver station presets.

  • Page 43: Graphs And Metering

    ‘held’ peak values. They display the highest peak for about one second unless a higher peak replaces it. The 525N Meter History utility graphs the positive and negative Meter History modulation over a given period of time. An example of this screen is shown at the top of the following page.

  • Page 44: Alarms And Notifications

    The Overmod alarm reflects the trigger criteria described under its local, front-panel setup beginning on Page 19. Closure: re- lates solely to the 525N rear-panel tally output, assigning it ei- ther to follow the ‘integrated’ Alarm function or the instanta- neous maximum-limit (+125% or –100%) Peak Flash trigger...
  • Page 45 Web interface page for the automatic message dispatch Notifications utility of the 525N to function. Refer back to Page 32 for in- structions on entering personnel into the Recipient: list. In the Email Notifications section of the Web screen, click the ar- row at the right of the Recipient: box.
  • Page 46 The 525N logs all alarms. Pull-up the Alarm Log by clicking the The Alarm Log + next to Alarm Log at the bottom of the screen. A sample log is shown on the next page.

  • Page 47: The Alarm Log

    Status: is a notation of how full the log is at the moment. Alt- Alarm Log hough the log is capable of containing a couple of thousand Capacity 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.

  • Page 48: Section Vi - Updating The 525N

    IV, Page 26, for specifics on assuring a connection between the 525N and your computer. This must be a wired, LAN connec- tion for both the PC and for the 525N. Attempts to use a Wi-Fi link are doomed to failure.
  • Page 49 [NO] to [YES] as shown below. When [YES] is bracketed, press a SEL button to remove the bracket. The LCD display will then tell you that the 525N is in the bootloader mode and ready for a firmware update. —...

  • Page 50: Firmware Update Files

    Webpage Uploader.exe file. The utility will have you confirm or enter the IP address of your 525N. Next click: Update and the existing Webpages will quickly be replaced with updated ones. —...
  • Page 51 INOVONICS WARRANTY 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”...

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