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Original Message -----
Subject: [softrock40] Crystals in Softrock LTE combined kit

>I really don't understand what is happening with the crystals for 20 meters operation. I understand that the counter needs a
>frequency that is four times that of the received signal to produce the two out of phase signals needed to produce the I an Q
>outputs.and I read that sampling is done at the 3rd overtone. Without a scope or spectrum analyzer I am having trouble trying to
>picture what the freq. is at the detector produced by the counter.
> The crystal supplied for 20 Meters is 18.73 megahertz.
>
>
> Is the crystal operating at the third overtone to create the 56 Mhz signal or is something else going on? I think I better buy
> a scope to really see what is happening.
>
>

A scope will not help:)
and other messages referring to "Subharmonic"

73 Alan G4ZFQ