[Elecraft] K3: SSB generation

Larry Lopez lawlopez3 at gmail.com
Sun May 11 10:06:56 EDT 2014


The 15 K Hz signal from the DSP is a SSB signal.
This is the second IF frequency (from the antenna side).

When this is mixed with the 8.230 Mhz in you
end up with the sum and difference with the 15KHz:

Namely 8.215 and 8.245 MHz.

The 8.215 MHz filter is used to remove the
unwanted 8.245 MHz component
leaving the desired first IF frequency



K1LI [via Elecraft] wrote:
> Thanks for writing, Lyle.
>
> I am curious, then, why the (K3) SSB signal is routed through a 
> crystal filter. Is it purely a "belt and suspenders" approach to 
> enforcing a limit on the bandwidth of the transmitted signal?
>
> Brian K1LI
>
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