This is a simple low pass filter design intended to  be placed in front of SDRs which are being sampled at 60Msps  and do not have sufficient stop band provided by their internal filtering to keep aliased responsesd >30 MHz from degrading performance below 30 MHz. This includes RX888 SDRs being sampled at 64 Msps instead of 129 Msps, as well as many other, narrower band SDRs such as the KiwiSDR which although it has some internal filtering may not have enough to prevent SNR degradation, particularly in the upper HF region.

This design is a frequency-scaled version of the previous LPF60 intended to further reduce large FM BCB aliasing in the RX888. Original architecture is from Paul, WB6CXC but this version has had common component values that are readily available at JLCPCB selectd.  This filter also effectively removes strong FM BCB but, of course, it also eliminates 50 MHz operation if used with a 129 Msps RX888. A QUCS model for this design is HERE. 

This design was assembled from similar parts on hand rather than the JLCPCB parts specified in the files below.  The resulting performance has been measured:

The PCB looks the same as the 60 MHz LPF but has different component values:

Of most importance in maintaining performance is the Q, the series resistance of the inductors. If different components are selected, either due to availability problems or to move the corner frequency of the filter, be sure to use quality RF inductors rather than lower Q 'power supply' parts.  Series resistance of less than one ohm is desirable to maintain low insertion loss and sharp corner.