On Sun, Feb 23, 2025 at 04:26 PM, ok4rm wrote:
I cannot just take some 5.3 MHz lowpass and put it as-is after the original 7 MHz lowpass because the input shunt capacitor of the appended LPF would add to the output capacitor of the original LPF and that would result in a mess.
Actually, Hans' Ultimate Lowpass Filter kit does just that, puts the highest filter always inline and switches lower-frequency ones in series with it:? "
This relay-switched LPF board kit can have up to five additional LPF's plugged in, permitting the??to sequence between 6 bands (including the LPF on the main U3 board)."
I have successfully cascaded filters and while the result may not have been textbook-perfect due to filter interactions it got the job done.??
It would not be difficult to do an experiment, you will need the filters in any case, just hook 'em up and see.
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73, Don N2VGU
Donald S Brant Jr