Trends in Technology: Monitoring HD Radio


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Multiple monitoring

Figure 4. Selecting parameters with the Goldeneagle. Click image to enlarge.

Figure 4. Selecting parameters with the Goldeneagle. Click image to enlarge.


Now if you have a cluster of stations in your market (and thus many IBOC streams) you may want to consider a different tack with respect to monitoring the digital transmissions such as Audemat's GoldenEagle HD. The company makes one for AM and one for FM, but we'll consider just the FM one in this case. Their operation is similar.

The GoldenEagle is definitely meant to go at a studio location. The primary means of communication with the unit is via IP. Here are some of its salient features:

  • Can be configured to scan and monitor up to 10 different stations
  • Can be configured to generate alarms based on attributes such as low RF level, low modulation level, excessive time differential (analog vs. IBOC)
  • Alarms can be sent via SMTP
  • Spectrum analysis (optional)
  • Supports SNMP, thus the unit can be queried by any SNMP manager
  • Will stream analog and digital streams
  • Real-time measurements of PSD, SIS, time delay

    Figure 5. Checking the time alignment on the Goldeneagle. Click image to enlarge.

    Figure 5. Checking the time alignment on the Goldeneagle. Click image to enlarge.


    Again, the GoldenEagle HD is really designed to monitor multiple stations and would be ideal for an operation needing to monitor a geographically large area. From one central location, any number of GoldenEagle HD units receiving stations in a statewide network (for example) could be monitored via IP on a real-time, proactive basis. (In other words, you log in to a unit and listen to any station via the unit's audio streaming capability.) Alternatively, they could be monitored 24/7/365, in the background, via SNMP. (Want to know more about SNMP? See the March 2011 Trends in Technology article.)

    To configure the Goldeneagle, use Audemat's GUI. Following are some of the more common pages used to monitor IBOC stations. Figure 4 shows one particular view where you can see among the tabs along the top that I've picked AM/FM HD Radio and the tabs near the lower left that I've selected PSD. Note the title and artist are shown. (When transmitting PSD data with digital streams this is something you will need to look at occasionally.) In Figure 5, I've moved one tab over to alignment, which will also need to be viewed periodically. There are two speeds at which you can measure the time delay. If you can rough the time delay in to what you think is less than 300ms, then you use short. If not, then you use long.

    Figure 6. Selecting the streamed audio feed. Click image to enlarge.

    Figure 6. Selecting the streamed audio feed. Click image to enlarge.


    The GoldenEagle also offers streaming audio capability. From Figure 6 you can see (again going across the top of the display) that I've selected the audio streaming tab. You can compare analog vs. digital (handy for roughing in the time delay) or you can listen to analog only, or the digital streams (up to eight).

    -- continued on page 3



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