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I am trying to scale an existing front end receiver (butterworth
bandpass) filter to a different frequency range. Unfortunately, it has a transformer in the original design, so I'm stuck. I also don't know how to handle the load presented by the active front end component other than it's probably not significantly reactive. The existing filter is for a 7 Mhz receiver, I'd like to have a similar filter design for 50 to 200 Khz. =========================== If you are happy with the HF receiver as is, would it not be easier and more effective to build an LF (50 - 200 kHz) to HF converter. This should be an easy project and you can select a quiet "HF band" for the conversion. I have seen designs with a SBL-1 mixer but also a number with the NE612 osc/mixer. Perhaps others frequenting this NG have built such a converter. Frank GMØCSZ / KN6WH |
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