Telecommunications is becoming ever more important for vehicles. At TU Wien, a new antenna concept has now been developed for cars.
Driving without communication technology has now become almost unthinkable. It seems quite normal to us that navigation systems regularly update their maps and shows us the way using satellite data, or that we can make phone calls while driving. In the future, data exchange will play an even greater role in road transport, not least to improve road safety.
In this series of pictures, we will show some of the assembly of a 2-element 40-meter yagi originally manufactured by Force 12. The original antenna was a 10.15.20 meter tri-bander model C4SXL, and included an optional EF240S 40-meter add-on, The original tri-band elements were scrapped, leaving only the 40-meter elements left on the boom. The original antenna used linear loading which consisted of a mess of wires everywhere. Mike Staal modified the Force 12 by converting it to coil loading with several adjustments. The end results were outstanding with a measured resonant center frequency of 7.133Mhz, in the SSB portion of the 40-meter band as I requested.
[K5ACL], aka [SignalSearch], recently brought his active receive loop antenna in off the roof to give it a checkup and perform any necessary maintenance. While it was in the shack, he took the opportunity to discuss how well it would perform indoors. The verdict? Not ideal. He’d mount it 50 feet away from the house if the HOA would let him.
The “Flower Pot” antenna is a clever twist on the half-wave, end-fed dipole antenna design that incorporates the coax feedline directly into the construction of the antenna. All credit for the design and instructions goes to John Bishop (VK2ZOI). Learn more about the history and development of the antenna, together with detailed plans and instructions by visiting John’s website:
An Easy-to-Build Tape Measure Yagi for Direction Finding
At the May 6, 2011 Clovis Amateur Radio Pioneers monthly membership meeting, Rob AE6GE demonstrated how easy it was to construct a 2-meter 3-element yagi antenna from a tape measure. Using the WB2HOL plans construction of the antenna is fairly simple and easy.
Using a low power amateur radio transmitter and a simple light bulb receiver circuit, we see how radio waves and electromagnetic induction transmit energy and signals wirelessly through the air. We also see how dipole and Yagi antennas radiate their energy in different patterns.