Ameritron RCS-4X 4-way remote coax switch (SO-239) Switches at £239.95 | Ham Radio
Homebrew
Practical wireless telegraphy; a complete text book for students of radio communication . pA/WWr-j ,:lf| iUm ^> i k>-^ : • I o < 4=^ I ! ; wvvi —€•—1- S.