It looks like you're new here. If you want to get involved, click one of these buttons!
More30/60KHz spurious signals.
Ihave a KiwiSDR with BBG that was purchased as a set. It is supplied from a 5V3.5A linear psu. After sorting out the interfacing to the network, it worked. I have a choice of two antennae, a 12m longwire, or a PA0DRT copy activemini-whip. There were a few unwanted signals to clear up with ferrite rings butas I go down towards the noise floor there are spurious signals that DON'T goaway with application of ferrites or screening.
AlsoI can see similar unwanted signals on a selection of already wired and active KiwiSDRweb receivers.
Ichose one of the stronger spurii showing on my RX, at 23127KHz +/-3-500Hz, as aworking point, and Itried and tried to reduce its level in the receiver, the spurs are about 30dBabove the noise floor. Very similar spurii can be seen on several other KiwiSDR RXs accessed via the SDR.hulist and I can post the screen dumps when I’ve worked how to do that.
Forthe moment I have given up as I can't get rid of these signals. They are even still there, at reduced levels, when I have removed the antennaand all my peripheral circuitry, leaving just the power cable (with largeferrite ring), and the CAT6 cable (with FT240-31 rings at either end) with theantenna input shorted out. In fact I surmise that the unwanted signals come directly from the IP networkcommunication.
Hasanyone else seen this? And better still has anyone found a way around the situation/problem??
Thenetwork switch is a Netgear Prosafe GB switch, model GS105 that is suppliedfrom a linear psu; and the connecting CAT5e cable is about 5m long. I am trying to find someone to lend me analternative switch.