Originally Posted By: mlord
There's a chap on another forum who's been suggesting PIN diode circuit solutions for this.

Here's the proposed circuit, and his explanation.

That circuit will need some tweaking to get right. The 30uH (which seems high to me, but maybe needed for VHF) look like high impedance to the PIN diodes, so the layout must be done correctly to ensure that the inductor doesn't load down the signal path.

You would be much better getting a single solid state switch and then putting additional SPDT on each signal path to increase the isolation.

The solid state switch is basically the same as this discrete solution but uses FETs instead of PINs. There will be series and shunt FET on each input. The selected path will turn the series FET on while the other paths will be shorted by the shunt FET.