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Image: iperf intervals on each of the adapters.

Transfer Bandwidth for adapter providing 4.75V or less:.Transfer Bandwidth for adapter providing correct voltage.Micro USB to USB cable 3ft from Amazon $4.69.5.2V 2.1A USB Power Adapter from Amazon $5.99.Voltage should be between 4.75 and 5.25 volts.Measure voltage from Pin# 02 DC Power 5V to Pin# 06 Ground.Using a multimeter set to 20 volts DC (or 20v =).The extra 0.2V mitigates the effect of the voltage drops in the cable and on the Raspberry Pi board.” “Raspberry Pi starts operating erratically below 4.75V” So, a USB device, or an HDMI monitor can push the Raspberry Pi into sub-optimal performance. The others do not.Īny device added to the Raspberry Pi uses power.

2 of the 5 adapters provide consistent 5V. I have 5 power adapters, which were included in Raspberry Pi starter kits. Image:power adapter and Raspberry Pi pinsĪ high quality power adapter is fundamental to a properly functioning RPi. I expect this to be a "living" instructable in that more adapters will be added and measured. provide best performing setup for selected adapter.select best adapter based on measurements.all others are in wpa_nf or /etc/network/interfaces.Proper settings on Wireless Access Point.The ones that matter are (in order of most important): I combined duplicate ideas and was left with about 30 unique improvements, and then over a four week span ran multiple measurements on each.Īlmost all of the ideas have no statistically significant effect on WiFi bandwidth. I gathered about 100 web ideas on how to improve WiFi bandwidth. However, the usual maximum bandwidth was 768Kbps, and bandwidth often dipped into sub-kilobit speeds. Using iperf3, an RT5370 and a Raspberry Pi 2 Model B, I measured a peak bandwidth of 1.69Mbps. Image: iperf3 results with a microwave running (red) and two LTE mobile phones making a call (blue). I wrote this instructable because I bought an RT5370 USB WiFi Adapter that was advertised as conforming to 802.11n, but struggled to run at 1Mbps. Get the most bandwidth from your wifi adapter.