[TenTec] Johnson TR switch

[Jim Lasley]

>Even cooler was the "Johnson Viking TR Switch."
>This was an external device with two vacuum tubes that automatically
>switched the antenna between the RX or TX (instantly) whenever it was
>activated.


Actually, the transmitter was always connected.  The tube saturated and recovered quickly, thereby removing the receiver from the line when transmitting.  No relay involved.  Worked great.  Did QSK with a 500 and Drake R4B.
 
73 de
Jim Lasley, N0JL, A1-Op
Chairman, Central Area Staff, NTS
Assistant Director, Midwest Division, ARRL
Manager Central Area Net Cy4
n0jl<at>yahoo.com
n0jl<at>arrl.org
n0jl<at>arrl.net