Example implementations relate to partitioning a radio into chains to scan channels. In some examples, a network device may comprise a processing resource and a memory resource storing machine-readable instructions to partition a default radio of the network device into a service chain and a scan chain in response to a scan request, scan a particular channel with the scan chain to discover devices operating on the particular channel of a network, and combine the service chain and the scan chain into the default radio.

A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. The controller receives a feedback voltage and adjusts the feedback voltage to adjust a blanking frequency, which is an inverse of a blanking time during which the transistor is prevented from being turned on. The controller turns on the transistor after expiration of the blanking time based on a level of a resonant ring.

Example implementations relate to partitioning a radio into chains to scan channels. In some examples, a network device may comprise a processing resource and a memory resource storing machine-readable instructions to partition a default radio of the network device into a service chain and a scan chain in response to a scan request, scan a particular channel with the scan chain to discover devices operating on the particular channel of a network, and combine the service chain and the scan chain into the default radio.

Methods and systems for substantially simultaneously scan of two or more frequencies using one transceiver are discussed herein. For example, a listening device can include a controller configured to control its transceiver to alternate between two or more frequencies from two or more sets of frequencies. The controller is also configured to capture a portion of a preamble of a received signal to determine whether the received signal is intended for the listening device.

Methods and systems for substantially simultaneously scan of two or more frequencies using one transceiver are discussed herein. For example, a listening device can include a controller configured to control its transceiver to alternate between two or more frequencies from two or more sets of frequencies. The controller is also configured to capture a portion of a preamble of a received signal to determine whether the received signal is intended for the listening device.

One heuristic for tuning a wireless power transfer device includes monitoring a circuit parameter while sweeping a power source frequency; identifying two frequencies related to local maxima of the circuit parameter values; estimating self-resonant frequency of an electromagnetically coupled device based on the two frequencies; determining a value for a tuning component of the wireless power transfer device such that the device self-resonant frequency equals the estimated coupled device self-resonant frequency; and adjusting the tuning component to the determined value. Another tuning heuristic includes monitoring a circuit parameter while sweeping the power source frequency; identifying two frequencies related to two local maximum for the values of the circuit parameter; determining a desired resonance frequency for the wireless power transfer device based on stored information; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.

A system for radio transmission, arranged in a single signal chain and including a direct digital synthesis (DDS) signal generator providing a signal within a first bandwidth; a frequency multiplier in signal communication with said DDS signal generator; said frequency multiplier adapted to convert said signal within said first bandwidth to a multiplied signal within a second bandwidth, wherein said second bandwidth encompasses a wider frequency range than said first bandwidth; a processor in communication with said DDS signal generator for programming said DDS signal generator to provide said signal within said first bandwidth; said processor further adapted to reprogram said DDS signal generator to alter said first bandwidth; a radio frequency (RF) port for transmitting said signal as a wideband signal; and, a radio frequency (RF) mixer for mixing an intermediate frequency signal with said multiplied signal to generate an RF signal; said RF port transmitting said RF signal as said wideband signal.

A system for radio scanning and signal generation including a direct digital synthesis (DDS) signal generator providing a signal within a first bandwidth; a frequency multiplier in signal communication with the DDS signal generator; the frequency multiplier adapted to convert the signal within the first bandwidth to a multiplied signal within a second bandwidth, wherein the second bandwidth encompasses a wider frequency range than the first bandwidth; a processor in communication with the DDS signal generator for programming the DDS signal generator to provide the signal within the first bandwidth; the processor further adapted to reprogram the DDS signal generator to alter the first bandwidth; a radio frequency (RF) port for transmitting the signal as a wideband signal.

A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. The controller receives a feedback voltage and adjusts the feedback voltage to adjust a blanking frequency, which is an inverse of a blanking time during which the transistor is prevented from being turned on. The controller turns on the transistor after expiration of the blanking time based on a level of a resonant ring.

A single complex calculation for locating a dominant frequency, such as an interfering signal in a frequency range, is replaced by several much easier ones. A signal is analyzed over a first frequency range to locate at least one comparatively significant frequency component therein. This can involve analyzing, using electronic hardware, a test range of frequencies to identify a potentially significant component within the test range; and determining, using electronic hardware, if a condition for finishing the analysis has been met. If the condition has not been met, the test range is modified as a result of the analysis and the operations of analyzing and determining are repeated.