开云体育

Quick question: I have an unbuilt rev 1 QMX board. Assuming I change the LPF toroid windings, is there any reason that a Rev 1 board can't be built for 20 - 10 meters? Thanks. Mitch NK3H

I don't think there is any reason why not, all you need to do is change the LPF and BPF toroids, windings, and their associated capacitors. Maybe also do T501 using the RWTST method.

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Chris, G5CTH

Thanks Chris. Mitch NK3H

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There is a kit of parts for that: ?

73, Don N2VGU

Note that you may need to modify number of inductor turns; it will take some playing with. The circuit around the band pass filter did change from Rev 1 to when the other band versions were introduced, which changes the parasitic component elements. So follow the manual for sure, but be prepared to do some tweaking at the end.?