Thanks Ken but I don't understand your last paragraph. What makes the IC7700
more capable in SSB mode than the K3?
Shane, VK5ABQ.
Ken-99 wrote:
>
> The K3 has a different receiver design. Its first IF is 8,215 Mhz while
> the IC-7700, IC7800 has an IF that is near 75 Mhz. The result is that
> roofing filters can be built for 8,215 Mhz that have smaller and pass,
> since trying to build a 200-500 cycle filter for the higher freq is
> impossible or extremely expensive using current technology. SO... the
> design of the K3 and Orion allow the roofing filters that are key to their
> performance.
>
> The higher first IF used in the Icom rigs has an advantage of fewer
> images. That is their key disign criteria, rather than a sharp roofing
> filter. As a result, I would say the K3 is the performance choice for CW
> and digital, where as the Icom rigs with all the bells and whistles are
> the SSB operator's dream. It "sure is pretty'!
>
> Ken K5WK
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