KA7OEI published a new build:
One of the issues common with using a broad-band, direct-sampling SDR (software-defined radio) like the KiwiSDR is that of overload by strong, low-frequency signals, such as those on the AM (mediumwave) broadcast band – but there’s another problem that should be considered as well: The high generally-high signal levels at lower HF frequencies. If one looks at an spectrum analyzer connected to a broad-band receive antenna during the evening, one will immediately note that the lower the frequency, the higher the signals seem – particularly the background noise.
See the full post on KA7OEI’s blog.
from Dangerous Prototypes https://ift.tt/2Ll5ANm