Map Calibration using Affine techniques -Has anyone out there done any work on map calibration using 3 or more known points on a paper scanned map, or a Google Earth map? As you know, you cannot use…Continue
I posted a blog on a Ball turret Gimbal design and build It appeared in DIYDrones with only 2 of the nine photos, and the text all garbled in between!! The preview before posting it was fine .Was…Continue
Good Day all,I have been spending a lot of time analyzing many different aerofoil profiles to optimize said profiles for a very specific flight regime. If there are any experts with good knowledge on…Continue
Hi Chris, maybe Bill (P) and other sensor boffins..Is there any temperature compensation and sensor orthogonality offset ( measured on a rate table maybe) done on the APM series autopilots? Has any…Continue
Seeing Andrew Tridgell's post on the SF02 LRF used for landings on APM, I thought I would post some flight logs of our landings using the same rangefinder.…Continue
This is a reasonably compact, linearly polarised and well behaved antenna, with a gain , when well made, of around 1dBD ( 1dB more than a dipole). It is smaller than the Big wheel and the Skew Planar wheel, and I have used it very successfully on 868MHz on our SurVoyeur UAV.
It is derived from a 1/2wave ring, located some distance above a large conducting ground plane. The ring is at a point on its circumference shorted to…Continue
Hugues and a few other folk have been looking at using dipoles on 433MHz, I presume this to be the telemetry or RCS radio frequencies used by them.
I have been playing with some concepts here to try come up with a repeatable implementation with reasonable performance.…Continue
The purpose of a Balun is to allow the connection of a coaxial feed line ( unbalanced feedline) to a balanced antenna , such as a dipole.
Picture at left is a Circularly polarised…Continue