https://devzone.nordicsemi.com/f/nordic-q-a/73450/ble-advertisement-on-1-particular-channelI am building an application nrf52840 SDK v17.0.2 soft device is S140 with Segger embedded studio. Application is to send advertisement data in one single channel (say channel 39) with property type BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTEDen-USTelligent Community 13Wed, 31 Mar 2021 13:06:31 GMThttps://devzone.nordicsemi.com/thread/302746?ContentTypeID=1Wed, 31 Mar 2021 13:06:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:76540b11-aa61-46e2-a7ee-af2b5c8ca2f6Manjunath S<p>So the device will actually be sending on only 1 channel?</p> <p>I will confirm this by using multiple mobile phones.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/302736?ContentTypeID=1Wed, 31 Mar 2021 12:52:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30a1ecb0-0893-41ae-a720-bea9c2b001c5Simonr<p>Hi</p> <p>This seems to be because your mobile device scans on all the BLE advertising channels (37, 38, and 39) for 4 seconds each. As it only has one antenna it will have to jump between the frequencies, so if your peripheral only advertises on one of these, then the gaps make sense.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>