BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2

Following on from BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003

I was sent some further info on the bootloader firmware and adapter hardware.

Initial experiments using an adapter that I use for a range of this type of application were unsuccessful. On examining the waveforms with a ‘scope, it was apparent that a lower value of pull-up resistor was required. Continue reading BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2

BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003

The recent release 11.2 of BLHeli supports some popular Atmel based ESCs.

ESC01

This article is a review of HK_UBEC_40A_MULTI_REV11_2 on that ESC (http://www.hobbyking.com/hobbyking/s…arehouse_.html) at 4S with a Hobbyking 4822-690Kv 22 pole motor and 1045 SF propeller.  This ESC was chosen as it is an inexpensive ESC that rates well in features (fast N FETs, support for bootloader and fully damped mode) in BLHelis documented compatibility list. Continue reading BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003

Trying to make sense of the VE7BQH Yagi performance tables

VE7BQH publishes a table of Yagi performance data derived from a number of modelling programmes. The table is often used as a definitive reference of the overall merit of an antenna by buyers, makers and students for their own situation.

This article is mainly motivated at better understanding the G/T column of the tables. Continue reading Trying to make sense of the VE7BQH Yagi performance tables

High performance 144MHz transverter design workup – noise and gain analysis

A correspondent is designing a high performance transverter from 144MHz to 28MHz to be used with a Elecraft K3 transceiver.

A question that arises is just how good should the performance of the transverter be, what Noise Figure and Gain should it have without having performance that cannot be fully realised due to external noise. Continue reading High performance 144MHz transverter design workup – noise and gain analysis

SimonK ESC FW – test of commit 1f75da – #2

X450

SimonK commit 1f75da: (20140313) with COMP_PWM was loaded on the F-30A ESCs on this X450 quad with APM FC, 3S, Hobbyking D2836-8 1000kv motors and 11×4.5 SF propellers.

Performed rapid acceleration under WOT, motor idle, recovery, maneuvers and no issues, no hint of sync problems, works fine.