Simple Homebrew SSB Base Rig Part 5 - Band-pass Filter

Band-pass filter based off the design in the book ARRL Solid State Design for the Radio Amateur.
Uses LTSpice to evaluate the effect of varying the capacitance across the two inductors on the passband.
Final design uses a split 40-385pF variable capacitor to get a continuously variable filter for the full 80m band.
Works well in the radio.

[billryland]

You are showing a high-oass filter. The inductors need to be in series with the output.

[Ralph-tHein]

Hi Charlie, your new video about the bandpassfilter and your examples was very very interesting for me . For me it was clearly to understand. TNX for that !!! Have a nice and peacefull christmastime !!! Best 73 es 55 de DB 9 FQ C 31 KM

[daviddavidson]

thanks for the videos.love the bandpass filter stuff.and still love how you use the back of the boards to mount your parts.Have a very merry christmas and safe travels...

[Kdbpy]

Cheers!....once again Charlie, Thank You for a very enlightening explanation into the mystery of filter design.

[researchandbuild]

Is there a specific reason you had to use FT68-2? I have some ferrite toriods FT50-43, that are 44uh for 10 turns, you would only need like 4 turns or so and not 38turns