Hey everyone!
I'm fairly new to RF coordination and wireless lav setups, and I've been having some frustrating issues on video shoots. I'm trying to figure out whether I'm making beginner mistakes or if the equipment itself might be part of the problem.
Here's the setup:
5 Sennheiser EM3732 Dual channel receiver Racks (470–638 MHz)
10 Sennheiser SK5212 bodypack transmitters
Antenna distribution system with two antennas
Usually 6–10 wireless lavs running simultaneously
Antennas mounted high up, separated by at least 2 meters (circled in red in the attached pictures)
Transmitters generally within 3–20 meters of the antennas
How I've been coordinating frequencies:
I used the built-in frequency scan on the Sennheiser receivers to find available frequencies, then entered those into Shure Wireless Workbench (WWB), with the correct Sennheiser equipment profiles selected, to check compatibility and intermodulation.
Whenever WWB flagged incompatible frequencies, I'd change them until everything appeared compatible.
I wasn't connecting the receivers directly to WWB, so this was all done manually. I know Sennheiser has its own software, but honestly, I found it pretty overwhelming as a beginner.
Here are the frequencies used on this shoot :
546.150 MHz
549.350 MHz
542.075 MHz
547.275 MHz
551.125 MHz
556.825 MHz
The problem:
Despite all this, I kept experiencing random RF dropouts, sometimes causing the receivers to mute completely.
A few things I noticed:
Some RF signals seemed stable, while others would constantly fluctuate up and down for no obvious reason.
Dropouts happened even when transmitters were relatively close to the antennas.
Lowering the squelch didn't really solve anything.
I experienced similar issues with both a 6-transmitter and a 9-transmitter setup.
The dropouts felt unpredictable, which made monitoring everything during a shoot pretty stressful.
For context, these are video shoots with multiple people wearing lavaliers, sometimes moving around. The equipment was lent to us, so I didn't really have a choice regarding the setup.
My questions:
Does anything in my workflow sound fundamentally wrong? Am I missing an important step in RF coordination?
Could the antenna distribution system, antenna placement, cables, or something else be causing these issues?
Is it possible that I did most things correctly but the older equipment is simply starting to show its age? The whole setup feels pretty bulky and outdated, although I know that doesn't necessarily mean it's unreliable.
How would you troubleshoot this systematically before the next shoot?
What modern wireless systems would you recommend for shoots with 6–9 lavaliers? Ideally, I'd love something that can scan the RF environment, automatically coordinate frequencies, and make the whole process more straightforward.
I've heard good things about Wisycom systems. Are they significantly more reliable or easier to manage in situations like this? Are there other systems worth considering?
I'm not expecting a magic plug-and-play solution, but I'd love to have a setup where frequency coordination is less of a headache and I can focus more on the actual recording.
Any advice, even if it's pointing out obvious rookie mistakes, would be hugely appreciated. I'm here to learn!
Thanks!