Cool Stuff: DB4004 FM Monitoring Receiver
This week we’re
highlighting winners of the Radio World “Cool Stuff” Award:
Broadcast, based in Bulgaria, is a relatively recent discovery for
many U.S. engineers, but the DB4004 is actually its second-generation
digital FM Radio Modulation Analyzer. It is a feature-rich, DSP-heavy
include dual antenna ports with RF attenuator; up to 100 dBµV
direct RF antenna input; selectable wide-range IF filter
bandwidth; bright bargraph LED metering of modulation and pilot
levels; total and independent Positive and Negative deviation bar
graph; and Left, Right, L+R, L–R bar graph LED audio level meters.
A built-in oscilloscope represents observed signal change over time
and helps you visualize what’s going on; a complementary spectrum
analyzer allows further useful analysis.
box also offers levels measurement with data history; selectable
e-emphasis (off, 50 µs and
75 µs); stereo decoder;
real-time audio program streaming; 50-channel data logger; and a
bunch more including Apple and Android device support. The OLED
display is easy to read; the menu is simple to navigate.