Gents,
having been with CC112x in EMEA for almost 10 years, I had the "pleasure" of having our modules certified for FCC/IC earlier this year; but we used part90 at 457MHz.
Formal enough, but we got it done.
Now an EMEA customer wants to go to the US market with high bay units using our RF (a handheld transmitter plus receiver); they want to use 915MHz.
In EMEA today, we operate at 434 MHz in the narrow band with no duty cycle restrictions.
But now we are faced with FCC part15. What I have learned so far is that we basically have a choice between
a. Frequency hoppers (DSS) or b. Digital wideband systems (DTS) with an emission bandwidth of more than 500 KHz, measured at the 6dB points.
a. is a nightmare, since the FCC mandates 50 channels of random hopping (yes, we now TI's swra482 - asynchronous hopping, but it's still a nightmare in battery-powered systems with such long preambles).
b. DTS: what do they mean by "measured at 6 dB points"? Do they mean that if I have a non-narrowband transmitter with such a large bandwidth, I can do without hopping? That sounds too easy, where is the downside?
Receiver: as we don't do bidirectional RF, the RX is a pure RX: do we need an FCC for that anyway?
Can you give me some advice on what would be the easiest way around this?
Many thanks