The elliptically-formed high pass filter HP0020 suppresses all frequencies below 2 MHz. Strong or near-by transmitters in the long- or medium wave range can cause interferences and intermodulation in the shortwave range, which can effectively be suppressed with this filter. The HP0020 filter is very steep, so that signals in the upper medium wave range are already suppressed effectively. For the greatest possible effectiveness, the low pass filter should be inserted directly before the receiver input.
Attenuation values (typ.):
>2.5 MHz: -1dB
Input and output are DC-blocked (max. 50V DC)
Dimensons: 88mmx31mmx25mm (3,46 x 1,22 x 0,98 inch)
Successfully tested with: Elad FDM-S1 and FDM-S2, FiFi-SDR1.0 and 2.0, PM-SDR, Winradio Excalibur, RFSpace SDR-IQ
Attention: Only suitable for reception, high HF (>10dbm) will cause permanent damage!
Because the filter is DC-blocked, it has to be inserted between the receiver input and the power inserter.