Tag Archives: Active Antennas

Active Antennas, Interference by Power Supplies: A Test


If you don’t have much place, an active antenna is a fine alternative. You have to concentrate just on the signal-to-noise ratio, not so much on the S-Meter.

A recent test of some pre-production and (semi-)professional active antennas did not only had stunning results, but also draw my attention to noise coming from the switching power supplies of SDRs.

I did some investigations on both the performance of two active antenna vs. a quad loop of 20 m circumference and the noise coming from switched power supplies vs. two linear regulated power supplies. Read more