[CQ-Contest] CW keying interface (reed relays)

[Marijan Miletic]

Never ending hamradio love for sharp IF CW filters has now been supported
with return to reed relays although PNP transistors are with us almost 50
years!

 

Please remember to add small serial resistor in order to prevent welding
reed contacts due to inrush current from RF blocking capacitor.

This problem re-occurs regularly with SB-220 standby on 120V.

 

Once upon a time, this hobby was supposed to increase technical knowledge.

 

73 de Mario, S56A, N1YU, happily retired