We’re currently testing a 5-element DF antenna array using KrakenSDR, targeting various frequencies including 145 MHz and 850 MHz. Our system initially performs well: when a known RF signal is transmitted (from a handheld radio), the direction of arrival (DoA) is correctly estimated, and the azimuth arrow on the app responds accurately.
However, after one second, the directional estimation becomes unstable, fades, or disappears entirely, even though the input signal strength remains the same. We’ve verified that the transmitting signal is constant, and we’ve tried multiple frequencies and antennas.
Can you explain a little more about what you see exactly when it fades or disappears? I don’t know what you could mean by it fading? For disappearing, do you mean that the lobe entirely disappears?
If you turn the transmitter off, then on again, does it show the correct DoA for 1 second again, or do you need to reset the entire system?
Our antenna is positioned in a fixed location. I check the DoA estimation compass, and my friend is signaling on the radio. When he starts pressing the radio, it points in the direction of the first lobe, but then it immediately starts pointing elsewhere.
On what type of storage device is the operating system installed?
What gain setting are you using? If it’s on auto gain, can you try a fixed gain setting?
How close are you transmitting to the Kraken? The Kraken is super senesitive and if your gain isnt at 0.0 while you are close to the kraken this is a normal outcome. You are overpowering it