There is nothing magical about a front end saver, IMHO. Several years ago I
built my first, a simple unit employing a pair of Panasonic PCB-type relays
which grounded both the RX antenna port on my transceiver and the beverage
antenna input to the preamp/switching system on transmit. As long as you do
not intend to use full break-in this system works very well and costs peanuts
to build; after some 15 years running a KW or better no problems have ever
occurred, and I have duplicated this simple design at other stations.
Of course, you can build a fancier unit which will handle full break-in and
perhaps have a few bells and whistles included, but the basic unit will serve
the purpose for most hams running separate antennas for RX and TX.
Bill VE3CSK/VE3NH
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