But if we take a look at the FCC test report, in addition to the ~1.16 GHz wideband signal in the licensed range, we see a huge side peak corresponding to the unmodulated carrier frequency right around ~24.100 GHz! The only requirements here are no spurious emissions in the satellite band <24 GHz, so it still passes certification with this extra peak. I missed it before because it is certified to operate in the 24.476-25.64 GHz range, well outside of police K band. The unit uses an UWB (ultra-wideband) pulse modulated and frequency hopping signal, with a nominal operating frequency of 25.05 GHz.

I looked up the BSM part from a Chrylser Pacifica and eventually found a picture of the BSM unit with the FCC ID clearly visible! WU8MRR25 Only one transmit antenna is employed at a time transmissions alternate between the two every other period. All antenna arrays exhibit a manufacturer declared peak antenna gain of 8.5 dBi individually and emit uniform broadside patterns (e.g. Maximum dwell time occurs at the frequency of the Fixed 28ms pulsed emission. The fixed 28ms transmission consists of encoded pulses with 50 percent duty cycle.

The chirped (frequency swept) encoded transmission consists of 4 frames with variable width pulses repeating every 31.6 us.

For both modes, the device transmits a the same pulse encoded frequency sweep (chirp) from one of its two transmit antennas, followed by a 28 ms encoded pulse transmission (fixed at 24.0596 GHz in the RH mode and 24.0666 GHz in the LH mode), all of which repeats every 80 ms.

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