[Elecraft] Filter question

[Mark Bayern]

>From the K3 FAQs (see <http://www.elecraft.com/K3/K3FAQ.htm>)

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Q: I'm still not clear on the general-coverage (GC) receive option --
if it is indeed "optional" or available by default in a minimally
configured radio.

The basic radio, as well as the subreceiver, has a full array of
ham-band-only filters at the front end. This is to ensure excellent
performance in the ham bands. These filters are switched in by means
of relays.

The KBPF3 option is a small plug-in module that sits above the
ham-band filters. It, too, has a number of filters switched in by
relays. The difference is that these are wider filters, covering all
of the area between the ham bands. But they share the same
input/output path as the ham-band filters. When not selected, the GC
filters have absolutely no effect on performance, thanks to a very
careful layout that minimizes trace lengths.  When you tune the radio
well outside the ham bands, an appropriate GC filter is automatically
selected by firmware.

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Hopes this helps -- at least with your KBPF3 question.


Mark   AD5SS