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VHF TX/RX switch w/ pin diodes
I am trying to design a solid state TX/RX switch for VHF (2-meter).
DC (when TX) | | pin diode TX-------|---------- Antenna | delay line | |-------- RX V (pin diode) GND (I am not good at ASCII drwaings !) My problem is the design of the 1/4 wave line that allows the RX input to be grounded while showing an open circuit at the antenna. One possible implementation would be a length of coax but at VHF frequencies that will be messy. Commercial equipments just use an LC circuit. I am looking for a pointer to the design of this cicuit. Thanks, Bernard |
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