The FET source resistor is necessary for the DC bias setting, and the LC drain circuit has little influence in this matter.
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At 14 MHz it makes not too much sense to install a preamplifier next to an antenna. Noise level is quite high from ionosphere and using a preamp may make any improvement only if you use a long and lossy cable to receiver.
Many good simple receivers for 14 MHz band use input mixers only and no preamp is needed.
To make a simple receiver you can use a preamp but almost to no advantage. Such preamp may rather contribute by adding intermoduation by stronger unwanted signals .
Thanks, but this is not about preamplifier. It was about how transceivers switch from receiving to transmitting, and what components are used in both of them. If I sound confused that's because I'm reading a lot from many different sources, including ARRL handbook. But there are some things that are not really explained so I have to ask them here.
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