And one more time we can offer you two little helpers, which can make life easier: The Low Pass Filter LP060 and the High Pass Filter HP0020.
During our tests of the Elad FDM-S2 at the DX-Camp together with the RMRC in March 2015, we repeatedly noticed phantom stations and overloads caused by nearby FM-stations. This also occurred with other radios, and since it is a well-known problem, NTi developed these two filters. They are exclusively offered by Bonito at € 59.00.
We tested these filters successfully with the following transceivers: Elad FDM-S1 and FDM-S2, FiFi-SDR 1.0 and 2.0, PM-SDR, Winradio Excalibur, RFSpace SDR-IQ.
Simply place your order online at our Hamradioshop or call us at +49 5052 6052.
LP060 Low Pass Filter
The elliptically-formed low pass filter LP060 from NTi suppresses all frequencies above 60 MHz. Highly effective antennas combined with near-by strong FM stations often overburden the input of the radio and cause interference and phantom signals.
The LP060 was developed aiming at the highest possible suppression in the 88MHz – 108 MHz FM band, whereas as the 6m amateur radio band at 50MHz is still totally within the pass band. For the greatest possible effectiveness, the low pass filter should be inserted directly before the receiver input.
Attenuation values (typ.):
52MHz: -1dB
60MHz: -3dB
80 MHz: -55dB
88-110 MHz: -90dB
110-150MHz: -75dB
150-200MHz: -70dB
200-400MHz: -65 dB
Dimension: 88mm x 31mm x 25mm (3,46 x 1,22 x 0,98 inch)
Input and output are DC-blocked (max. 50V DC)
Attention: Only suitable for reception, high HF (>10dbm) will cause permanent damage! When using end-fed active antennas: Because the filter is DC-blocked, it has to be inserted between the receiver input and the power inserter.
Successfully tested with: Elad FDM-S1 and FDM-S2, FiFi-SDR1.0 and 2.0, PM-SDR, Winradio Excalibur, RFSpace SDR-IQ
Made in Germany
Example of use:
Output spectrum of a MegaLoop ML200 loop antenna in the range of 0-150 MHz with 5 m (16ft 4.9in) litz wires radiator.
In the area of 88-108MHz you recognize the dominant FM band, which even surpasses the shortwave range.
After inserting the LP060 all frequencies above 60MHz are effectively suppressed:
You can buy the LP060 now at Hamradioshop.net
HP0020 High Pass Filter
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.):
<0.50 MHz:-55dB
1.0MHz: -45dB
1.6 MHz:-35dB
2.0MHz: -3dB
>2.5 MHz: -1dB
Input and output are DC-blocked (max. 50V DC)
Dimensons: 88mmx31mmx25mm (3,46 x 1,22 x 0,98 inch)
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.
Attenuation curve of the HP0020:
You can buy the HP0020 now at Hamradioshop.net