If you plan to use CW or narrow data modes -- even a little -- you'll
want at least one narrow filter (our 500-Hz 5-pole filter is a very
cost-effective choice). I'm not trying to sell filters, but I want K3
owners to get the most out of the K3's receiver architecture. It's
based entirely on the use of high-performance 1st IF filtering, just
like the K2. Only better :)
Details:
The DSP itself has excellent dynamic range, but its A to D converter is
protected by a gain-controlled I.F. amplifier that kicks in at high
signal levels. Let's say you're listening to a signal in a 500-Hz DSP
bandwidth but using a much wider crystal filter (say 2.7 kHz), when an
S9+30 signal pops up just 1 kHz away from your center frequency. This
signal would reduce the I.F. gain and thus the noise figure.
But if you had the 500-Hz 5-pole filter installed, you would not even
know that this interfering signal was there. No effect. Nada. Zip!
73,
Wayne
N6KR
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