One of the variable-passband filters we've been considering is one
for SSB, with a range of about 1.4 to 2.2 kHz. It would have 5 poles
rather than 8, but I'm sure it would work well in combination with
the I.F. DSP. The MCU would automatically dial in the crystal filter
bandwidth to match the DSP.
This would be a slot-saver for those want multiple SSB RX
bandwidths. Once the CW variable-passband filter was also ready, you
might have:
FL1 6.0 kHz
FL2 2.7 or 2.8 kHz
FL3 1.4-2.2 kHz (SSB variable passband crystal filter)
FL4 0.4-0.8 kHz (CW variable passband crystal filter)
FL5 200 Hz
Wayne,
Can you give me a rough projected price range that these two variable
roofing filters might sell for so that I can decide whether to buy
fixed filters now or wait for the variables...
73,
Paul
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