Appropriate FET's can switch low level RF.
But it's usually PIN diodes or relays when switching power at the output of a transmitter.
Google "1n4007 as pin diode TR switch" for ideas on how it gets done using junkbox parts.
Look at all the FET's doing the T/R switching on the Bitx20 on p33? here:
? ?
I count a total of three series 2n7000's and two shunt 2n7000's,
Can't have any signal through that RX path during transmit
or the PA will be?a 10W oscillator at some undetermined frequency.
Same is true of the uBitx, hence the two relays at K1 and K3 both
break the RX signal path during transmit (and K1 shorts it to ground).
Jerry, KE7ER
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On Sun, Dec 30, 2018 at 01:28 PM, Woody wrote:
Have used MOSFETS to switch high current, low voltage lines.? Some of the newer devices offer on resistance of just a couple of milli-ohms.?? A TO-220 can switch well over 20 amps even with no heat sink.
