[hornychz]

Hello,

in the last two days I measured the antenna gain in the band of 433MHz. The results are quite interesting and maybe answer a range of questions:



What is certain and substantial:

1) As already stated Werk AG, arguably the best antenna is a small 5 cm antenna with a gain of 2 dBi dictated.
2) The ideal supply voltage is around 9V.
3) Critically important is the quality of the supply voltage - its publication.
4) Critically important is the same polarization of both antennas - the transmitter and receiver and their proper orientation to each other.
5) And very important is the environment in which the RF signal propagates.

The photo of this antenna and measurement:


And the others photos:
   

Another photos in the next contribution ...
Regards