Mod Monitors Special Report: Day
David Day is president of
DaySequerra Corp. He comments
as part of Radio World’s special series on tech trends in modulation monitor
how have mod monitors and station signal test gear changed in recent years?
Day: Faster digital signal processors (DSPs) and
advances in software-defined radios (SDRs) give us the ability to deliver very
precise measurements at a lower cost than at any time in the past. And
engineers can use these monitors remotely, in some cases even from their cell
what direction is this business segment heading next?
Day: Customers want more automated monitoring systems that
provide email and other methods for notification and correction of problems
before the listeners are aware of them. Corporate groups want
quality-of-service reporting to the headquarters to manage the issues in the
field. Coupled with the advances in system integration, this means more
autonomous interaction with the transmission chain.
been active in HD Radio monitoring and measurement. What’s the most common
problem or misperception in this area?
Day: From an engineering perspective, I think maybe the
most frustrating problem is maintaining HD Radio MPS and HD-1 time alignment.
In the beginning, we all believed that you set the time alignment once and the
streams stayed aligned. Experience has shown that once either stream drops a
packet (or packets), the streams come unglued and drift. And then the PD calls
— again …
the next big challenge in this sector?
Day: Technology changes mean that radio monitors are much
more software-based network appliances than they were even five years ago. This
drives systems design much more towards software programmers than hardware
designers, changing the very makeup of our workforce.
newest or most notable product?
At NAB 2013, we’ll introduce
our new line of DSP-based AM-FM analog and HD Radio modulation monitors, and
our breakthrough HD Radio M4DDC TimeLock, a single box solution that
automatically maintains MPS and HD-1 time and level alignment. The M4DDC is the
first solution like this and solves a nagging, real-world problem for HD Radio
else we need to know?
Day: Scarce and thinning engineering resources truly have
their hands full today. Imagine you have an FM
HD Radio station that depends on a repeater, translator or synchronous
transmitter to fill in a few holes in the main station’s coverage area. If you
maintain these facilities — particularly in the case of synchronous
transmitters — it is critical to the HD Radio signal that the signals are in
perfect synchronization. This is just one more crucial aspect to keeping a
quality signal on-the-air that keep engineers focused in 2013.