The ADG704 has 54pF ON capacitance and it might degrade signal of TCXO (limit of 10pF).
Sorry for repeating my question, I just don’t understand why the signal will be degraded – is the shunt transistors works when the switch is on?
What is the impedance of the shunt transistors? Is it 50 Ohm?
I don’t see it reasonable to have 50 Ohm on the input signal, because if it is activated when switch is on with 50 Ohm to ground then you lose 3dB ?