The most obvious factor when choosing an oscilliscope is bandwidth. 50MHz is better than 20MHz, and 100MHz is definitely better than 50MHz, etc., but what does that number really mean, and how fast is fast enough for your needs? They're both capturing the 3.3V 40MHz pixel clock of a large (800×480) TFT LCD, and the frequency is the same 20MHz is the most common Wi-Fi bandwidth as most users still opt to use 2.4GHz radios. In an environment with less congestion where a higher data throughput is required, using the 40MHz channel can be a good idea as it still offers 12 non-overlapping channels on 5GHz. 80MHz is available on many 802.11ac routers. A non-AP HT station may switch between 20/40 MHz capable and 20 MHz capable operation by disassociation and association or reassociation. 20/40 MHz capable and 20 MHz capable HT stations must use the 20 MHz primary channel to transmit and receive 20 MHz HT frames. The Notify Channel Width action frame may be used by a non-AP station to notify In addition, the speed can be set to 20Mhz or both 20Mhz/40Mhz. It will use 40Mhz if available or fall back to 20Mhz otherwise. There is no 40Mhz only option. So just because the network offers 40Mhz, doesn't mean it stops support for the 20Mhz also. It all matters what standards have been enabled. Not all client devices support 40MHz channels, so don't enable 40MHz-only mode. Devices that support only 20MHz channels can't connect to a Wi-Fi router in 40MHz-only mode. Similarly, don't enable 80MHz-only mode, or only clients capable of 802.11ac will be able to connect. Routers that don't support 40MHz or 80MHz channels do support 20MHz MLr3.

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