The Beginner Videographer’s Guide to Frequency BlocksGear Talk
Wireless mics are an essential part of documentary filmmaking. The mics are small and easily hidden from view and the wires are minimal. If you’ve seen a reality show (if so, my condolences), sometimes you get a peek at the metal mound protruding out of the backs of people’s clothes. Those are lavaliers and they are handy. They are used often by wedding videographers since shotgun mics aren’t super awesome at picking up the vows from clear across a church. You don’t see them as often in movies because people have to actually wear them (and that is distracting) but for sit-down interviews, or most TV applications, they’re great. If you’re just starting to get into any of these fields, read up on frequency blocks – you’ll impress (if mildly) your sound tech.
What are Frequency Blocks?
There are a finite number of frequencies that are allowed to be used in different parts of the world. The frequencies are a range of hertz units that are divided into “blocks” and certain countries cover certain blocks and not others. For a quick refresher, hertz measurement is the number of waves that pass/vibrate per second. So different blocks cover different ranges of frequencies. For example, Block 22 is universally understood to cover 563200000Hz - 588700000Hz (or, more commonly denoted in MHz: 563.200 – 588.700). (more…)