I disagree. It's not that you pinpoint exactly which frequencies are usable at any given time, but I believe that you reference the used frequencies (TV, Radio) in the area and see where you have space. I'm almost positive that there is a way to figure this out. In fact, if you check back in my posts, there should be a thread where someone does just that (asks for zip code and gave me three sets of four frequencies that should be good.) Either way, if they aren't perfect, you can always adjust them to find optimal RF signal.the_dude said:
I also disagree. While you are right in that selecting bulletproof frequencies would require being on-site with a spectrum analyzer (which costs thousands of dollars and requires an experienced operator), it is possible to select frequencies that do not conflict with local television stations and which are not likely to have intermodulation problems.the_dude said:
Exactly. If frequencies are not planned out properly, it is possible for them to mix together and generate noise on new frequencies in the mic receiver. For instance, if you have two units running at A:600 MHz and B:602 MHz, you may find interference at 598 (2A-B) and 604 (2B-A) MHz respectively. The number of products increases exponentially based on the number of frequencies in use. This is why any system using more than a few mics should be planned out by an expert or with the aid of computer software. One program that is especially useful is called SIFM by Sennheiser. It runs on Windows only, and is available here:mbandgeek said:What Exactually are BAD Frequencies? I am assuming interference?