Qrp project – filters

Figure 2: The extra harmonic filter is ready for action in this photo.

I’d used a kit for the PA output LPF in the TX box, but when I added an additional filter between the Progrock and the BS170 driver, I just put it on perf board.

I also cobbled together a little coffin for the filter.  using double sided copper clad board pieces, and a lot of solder.  Note the solder does the most good when it’s used on the inside seams, where there is copper-to-copper contact.

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About ronaldscheckelhoff

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