A limited attenuation high-pass filter for the KiwiSDR

limited_10MHz_HPF_inside_1a-600

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

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