This article explains how to measure G/T using the Sun. Continue reading Measuring G/T
Checkout of EMRCalc quiet solar flux report
EMRCalc v9.09 contains a facility to fetch a current report of quiet solar flux from an online source.
Above is a sample report. Continue reading Checkout of EMRCalc quiet solar flux report
EME path calculation based on G/T
A correspondent asked if it was possible to calculate the link budget for an JT65 EME path using the G/T worksheet at (Duffy 2014). Continue reading EME path calculation based on G/T
Comparison of SimonK and BLHeli on an Afro30 ESC
This article documents some comparison tests of:
- SimonK commit 1f75da384e5c83f83916aa752819ca6eed712565 afro_nfet.hex with COMP_PWM; and
- BLHeli v11.2 commit baaa4db600b5cd78752c9b4f580fd08d15f1f1f1 for Hobbyking Afro 30A.
Continue reading Comparison of SimonK and BLHeli on an Afro30 ESC
BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3
Following on from BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003… and BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2…
This article documents some comparison tests of:
- SimonK commit 1f75da384e5c83f83916aa752819ca6eed712565 bs.hex; and
- BLHeli v11.2 commit baaa4db600b5cd78752c9b4f580fd08d15f1f1f1 for Hobbyking 40A ESC 4A UBEC.
Continue reading BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3
G/T spreadsheet update (v1.09)
For those who may have used or want to use my G/T spreadsheet tool I have discovered a defect in one cell’s formula. Continue reading G/T spreadsheet update (v1.09)
Galvanised steel wire OCF dipole
I was chatting on the weekend with a new ham who was inspired by an article in Amateur Radio to build an OCF dipole using galvanised fence wire.
I have not seen the article, but he recalled that it recommended single core 1.25mm galvanised wire as quite suited to the task of an 80m OCF dipole. The wire consists of a mild steel core with a thin layer of zinc. Continue reading Galvanised steel wire OCF dipole
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
PIK and auto-space
It is more than 10 years since I designed the PIK (PIC Iambic Keyer), a semi automatic Morse keyer (Duffy 2000).
This article looks at the operation of the auto-space feature of PIK. Continue reading PIK and auto-space
BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003
The recent release 11.2 of BLHeli supports some popular Atmel based ESCs.
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