BLE Spectrum Vs Bluetooth Classic V2.0

RE: BLE Spectrum Vs Bluetooth Classic V2.0

Frederic — Wed, 27 May 2020 13:16:42 GMT

Using Ble_1Mbit in the Radio Mode Register satisfy the certification lab.

RE: BLE Spectrum Vs Bluetooth Classic V2.0

ketiljo — Thu, 14 May 2020 13:25:40 GMT

Hi Fredric

That looks very normal.

cheers,

Ketil

RE: BLE Spectrum Vs Bluetooth Classic V2.0

Frederic — Thu, 14 May 2020 11:53:37 GMT

I did and it look like this:

RE: BLE Spectrum Vs Bluetooth Classic V2.0

ketiljo — Thu, 14 May 2020 11:42:58 GMT

Hi Frederic

3 kHz is too low to capture the modulation envelope. Use 100 kHz for these measurements.

cheers,

Ketil

RE: BLE Spectrum Vs Bluetooth Classic V2.0

Frederic — Thu, 14 May 2020 11:35:34 GMT

By changing Nrf_1Mbit to Ble_1Mbit I get this:

Instead of this:

So it look like the value of the Radio Mode register is changing the spectrum form. What bother me is that I have to set the RBW = 3KHz instead of 100KHz like the lab to get this. Otherwise I get this:

Could it be link to the spectrum analyzer and probe that I use?

RE: BLE Spectrum Vs Bluetooth Classic V2.0

ketiljo — Thu, 14 May 2020 07:15:17 GMT

Hi Frederic

This is how I measure it, 1 Mbps BLE modulation

As you see, it's not as "pointy" as yours. It might be due to the mode you're using, but it's definitively not Classic Bluetooth. If you can send me the code, I can check it.

best regards,

Ketil Aas-Johansen