https://devzone.nordicsemi.com/f/nordic-q-a/17340/what-s-access-address-and-channelRegarding the radio peripheral, I stumbled upon these 2 properties and have no idea what they are for. What&#39;s access address? And what is a channel? Shouldn&#39;t there be &quot;channels&quot; since the radio peripheral of nrf51 devices works by frequency-hoppingen-USTelligent Community 13Wed, 26 Oct 2016 09:48:46 GMThttps://devzone.nordicsemi.com/thread/66635?ContentTypeID=1Wed, 26 Oct 2016 09:48:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dcb4b367-f695-49ac-b895-a110334b1ce1J&#248;rgen Holmefjord<p>Hi,</p> <p>With access address I guess you refer to the on-air radio address. The radio can be configured to listen for certain addresses, where only address matches will be accepted. For instance, when the radio is in BLE mode, you only care about data sent from other BLE devices. BLE use the <em>&quot;access address&quot;</em> 0x8e89bed6, so the radio only have to listen for packets that match this address. Configuration of on-air radio address is described in chapter 17.1.4 of the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/pdflinks/ref_manual.html?cp=3_2">nRF51 Reference Manual v3.0</a>.</p> <p>A channel is a specified frequency that the radio transmitts/receives at. The nRF51 radio does not use <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.gs/dita/gs/avail_protocols.html?cp=1_0">frequency-hopping by default</a>. BLE use FHSS, while ANT use fixed-frequency. Proprietary radio protocols can implement both FHSS and fized-frequency.</p> <p>Yes, you can transmitt <em>RAW</em> data. Look at the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.0.0/nrf_dev_radio_tx_example.html?cp=4_0_0_4_5_22">Radio Transmitt</a>/<a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.0.0/nrf_dev_radio_rx_example.html?cp=4_0_0_4_5_21">Radio Receive</a> examples.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>