[Elecraft] 1N4007 diode question?

[John, KI6WX]

A pin diode can actually block RF voltages that are higher than the reverse
bias.  This is quite true of the 1N4007's used in the KPA100 T-R switch.
They would probably work fine with only 20-30 volts of reverse bias.  With
the 100 volt bias used on them, you have even more margin, especially when
driving non 50 ohm loads.
-John
 KI6WX

----- Original Message -----
From: "Ron D'Eau Claire" <rondec@easystreet.com>


I've used a great many silicon diodes as RF switches. That use goes way back
before PIN diodes. All one needs is sufficient bias to keep the diode either
conducting or not conducting, as you desire.

Isn't the unique feature of a PIN diode its ability to act as a variable
resistor to RF as the bias is varied, rather than rectifying he RF? That
capability isn't used in a simple T/R switch like, say, in the KPA100.