Apr 022015

This antenna was posted in 2012 on FPVLAB, obviously never made it into the blog…solved. 😉

Just in case someone needs a simple and easy to build ground station antenna, usable with any 433MHz TX, here is a solution:

Beer-CanTenna measurement setup:
Return loss at 433MHz:
Inside the can:
On a tripod, extended to ~3m height:

What you need:
1x Beer can, height 170mm, outer diameter 66mm, top opening diameter 52mm
1x Steel welding rod, 500mm length, diameter 1.5mm
1x BNC or SMA panel mount socket with front side nut

How to build:
– First, enjoy the beer, thats a mandatory step. 😉
– Remove the top cover of the can. In a way, that you keep the outer folded ring.
-Drill a hole in the bottom center to insert the BNC/SMA socket.
– Solder the welding rod to the BNC/SMA center contact.
– Measure the length of the rod including the center contact and cut the overall length to 490mm.
– Insert the socket through the bottom hole and fix with the nut.
– Cover the top opening with some non-conductive material. I used some EPS foam.
– That’s all.

I made a extension pipe with a BNC socket on one end and some tripod adapter on the other. This way I can raise the antenna up to 3m on the tripod.
Extention Ext_Socket Ext_Cable
The antenna connects with a 5m BNC cable to the transmitter.

I have tested the antenna during my 11km flight with excellent results.

A fellow pilot uses a second antenna with 433MHz 3DR radio modes to control his APM2.5 plane. He was 3km out already then chickened.

Note, a different size beer can may require a different length of the welding rod.

Mar 252015

Comparing these two is an excellent example of western values, their hypocrisy, their ethics and the interests of government controlled media.

Cockpit voice recorder initial evaluation started just the next day and first results are already available. What about MH17?  Where are evaluation results from cockpit voice and flight data recorders? I bet on the first anniversary of the 4U9525 crash the truth about MH17 will be still in the dark. Obviously it doesn’t fit the scenario… western values my ass.

Mar 142015


English subtitles:

All informations: www.lauffeuer-film.de

A movie about the fire attack on the union building in Odessa at the beginning of the Ukrainian civil war, the role of ultra nationalists, the police and politics in the post soviet area. It’s a documentation of key events of the Ukrainian civil war and a city that was split.

A movie by Ulrich Heyden & Marco Benson, produced by leftvision.de