The LG LCD television failed after less than 10 years, the LCD backlight would not always start and it became a bigger problem each winter.
|AWG||Cond dia (mm)||CSA (mm^2)||R/km (Ω)||Imax|
Derived in part from data published by Wiremax.
A set of four Skywalker 40A ESCs were purchased for trial on a tricopter (3 on bird, one spare for testing). They cost about $15 ea incl shipping on eBay, and they appear to be genuine Hobbywing product.
Speaker cable and similar Figure-8 twin in various sizes is popular as RF transmission line, particularly with QRP operators, especially those operating portable in the field (eg SOTA activators). Indeed, SOTA seems to have triggered a revival in the use of these cables. With the large number of online recommendations, one could be forgiven for thinking that a dipole and feed line formed entirely from #24 speaker wire is the antenna of choice.
With that in mind, this article looks at the performance of Jaycar WB1702 speaker cable, 14×0.14mm conductors (#24) with PVC insulation, cost $0.50/m.
Matched Line Loss (MLL) is the loss or attenuation of a transmission line terminated in its actual characteristic impedance, and usually give for some length, eg dB/100′, dB/100m, dB/m.
One method that occurs in ham radio articles is to measure the input resistance of a resonant s/c or o/c stub, and to calculate MLL as 8.686*Rin/Zo/length dB/unitlength. (This is not the only method, or even a good one, but it is commonly used.)
Bench tested a DT750 on 3S, Afro30 with 2013-10-29_8c2cf42_comp_pwm, 11×4.5SF and Eagle datalogger. This motor is reported by some to be incompatible with SimonK.
G3TXQ has published (undated) a set of measurements on commercial windowed ladder line at Wet ladderline (accessed 10/01/14).
His measurements are of interest as there is a dearth of credible measurement data for these types of lines below 50MHz. Continue reading Windowed ladder line loss – G3TXQ
A new Hakko FG-100 arrived from China this week, the meter and pack of 5 sensors cost less than A$12 including post.
This article describes a driver for flashing LEDs using a repurposed ESC.
I measured 6 different ESCs (all different types) at 25° with a 16MHz ceramic resonator, and standard deviation was 1200ppm, or 0.12%.