>Regarding PIN DIODE QSK devices... > >Does anyone have any old articles on how to build such devices? > >I occasionally see that Design Electronics QSK-1500 unit. Are they any good? > >I would like to go QSK on a small ampifier but can't see spending $350.00 >for the privilege (grin!) > € It can be done for c. $60 using high-speed relays and an opto-isolator.