Category Archives: PCBs

Crystal Ladder filter

in PCBs by DP | 2 comments

Dan Watson writes: Here’s a little board for making a four pole crystal ladder filter. This type of filter has a very high Q and narrow bandwidth, allowing you to select a specific frequency from your signal. Because of the … Read more

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RF probe

in PCBs by DP | 0 comments

m0xpd writes: Today I finally got round to building a nice little RF probe kit from Rex, w1rex, the Tuna King over at QRPme. I took the well-executed PCB which – unusually for Rex – had through hole mounting for the … Read more

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