On Thu, 7 Oct 2010 13:49:12 -0700 (PDT), "
wrote:

I really doubt they are using reed relays because of the open
capacitance of the contacts,

Measuring in at 0.1pF? the 1N914 (UHF switching diode) is easily 10
times this and more.

plus, reed relays often stick shut

Ma Bell used them in the millions with 99.999% up-time.

because of fatigue,

We are talking about a switch rated in the 100 Millions to Billions of
operations.

static electricity, and if left closed for a long
time, metal migration will stick them closed.

That is true with issues compounding this, but as the receiver has its
own spectral display, problems will be shown to you directly.

Bet they are using regular relays, but in miniature form.

Which would suffer the same issues you offer above.

Reed relay usage design is not for the faint of heart, but when
properly matched (an ugly word here) to the load, then they can
provide service beyond your (and your children's) lifetime in this
application.

73's
Richard Clark, KB7QHC