4-way Isolating Antenna Distribution

This is intended to distribute a single 50 ohm antenna connection among up to four receivers. It also can provides some gain control and selectable frequency shaping to accommodate the need for more gain at 30 MHz than lower as needed by  in the context of real propagation and antennas. The goal is to create transparent connections for each receiver so that what it gets is as nearly the same as possible compared to what it would have were it the only device on the antenna.  This means that low noise, low IMD and 0 dB gain, modulo shaping, are the goals.  Of course, this can't be done perfectly.

Because this is all Open Source, the potential builder has the freedom to adapt all of this to suit local requirements. The newest version has added a switches to bypass gain shaping.

Here's one of the outputs taken at maximum gain and also set for 0 dB at LF.

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