The spectrum analyser solves this. Most Land Mobile Radio / Two Way Radio shops own one, if your ever in doubt and have a quick need to see if your being jammed. Hand the tech 40$ to shoot a spectrum for you. Solves the problems instantly. Since the DTV switchover occurred, I've found a lot of mics setting in the middle of a DTV channel, too. What is channel three in the past might advertise and show up on your set as a channel three, but is actually broadcasting on old RF channel 49 etc. The FCC and NAB did that so no one lost branding, its actually built in the set and transmitter hardware. So finding out what freqs are clear requires some skill, or a 250 to 6,000$ box to see who is using what.
Recently a new UHF band was set aside for wireless mics in the US, but my bet is that gets congested fast, and the hardware is just coming on the market.
This is not just a Norte Americano problem folks, cell companies are sucking up spectrum all around the world, and have lobbyists. 2.4 Ghz mics are not always a great choice, in a auditorium or stadium full of phones blaring out BlueTooth and WiFI in the same spectral band.
I had problems convincing leadership, too. One good cell phone photo of a SA screen, and argument won. Them (cell site, DTV station , 6 Mhz wide glob of RF crap) looks huge on a SA screen, compared to US (tiny, narrow spike).
Steve
Steve
Last edited by mixedgas; 04-13-2017 at 05:39.
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...