>"Here in Europe on large antennas at night on the low bands, especially 40m,
>PIN diodes can partially forward bias and create IMD products. All the strong
>arguments you hear from engineers in favor of PIN diodes are coming from the
>states, not from the engineers in Europe. A reed relay is a better option."
I believe the concern relates to the type of switching diode and bias levels
used in a *Receiver's* BPF, not a PIN T/R system. Ulrich Rhode made this a
popular topic in the early 1990s with his QST article titled: "Key Components
of Modern Receiver Design: A Second Look." See his discussion concerning PIN
diode biasing with comparisons to other forms of band switching diodes.
QST subscribers can read it here:
http://p1k.arrl.org/pubs_archive/90957
Paul, W9AC
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