Common Properties (Bluetooth)
The section appears at the top of the dialog box, above the Demod and Time tabs. It holds the signal-description settings that are shared by both Bluetooth measurements (Bluetooth Demod and Bluetooth Spectrum), so the settings are entered once and apply to every Bluetooth measurement in the analysis.
PHY Physical Layer Family - The Bluetooth physical layer family. Only (Bluetooth low energy) can be selected in this release; and appear in the list but are unavailable.
Default: LE
PHY Rate - The LE PHY of the signal.
Default: LE 1M
Choices: LE 1M, LE 2M, LE Coded
Packet Type - The type of LE packet being transmitted. It selects the access address the burst search correlates against and the whitening rules applied when the PDU (protocol data unit) The data unit exchanged between peer entities of the same protocol layer. On the downward direction, it is the data unit generated for the next lower layer. On the upward direction, it is the data unit received from the previous lower layer. is decoded, so it affects the measurement. The tests measure the spectrum without decoding the packet, so this setting does not affect them.
Default: LE Data
Choices: Auto, LE Advertising, LE Data, LE Test
Channel Index - The Bluetooth channel the transmitter occupies (0–39 for LE, 2 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. spacing). This is the frequency-ordered RF Radio Frequency: A generic term for radio-based technologies, operating between the Low Frequency range (30k Hz) and the Extra High Frequency range (300 GHz). channel: channel 0 is the lowest channel, at 2402 MHz, and each step up is the next 2 MHz channel.
The Core Specification numbers LE channels a second way, reserving the indices 37, 38 and 39 for the advertising channels. Those three are RF channels 0, 12 and 39 in this setting, so the advertising channel at 2402 MHz is entered here as 0, not as 37. When the measurement de-whitens a PDU it derives the Core Specification index from this setting, so the whitening seed follows the channel entered here.
A value past the end of the channel grid is clamped onto it.
Default: 0
Channel Center - A read-only display of the selected channel's center frequency (2402 MHz + 2 MHz × channel index for LE).
When the selected measurement is tuned away from this frequency, that measurement's own center frequency appears beside it, so the channel's center and the center actually in force are both on screen. The second readout is hidden while the two agree, which is the section's confirmation that a retune took effect.
-> Measurement Center - Click this button to tune the measurement center frequency to the selected channel's center. The retune is a one-shot action: the measurement center does not automatically follow later channel changes, so click the button again after changing the channel index.
If the retune reports anything, a message appears at the bottom of the section with an information, warning or error icon. The message row is hidden when the last retune had nothing to report.
See Also
