Re: Additional BPF's for other Bands
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Thank you for the info. Keep up the good work? I'll build one for mine 73 John
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On Feb 4, 2017, at 7:40 PM, Ken < chase8043@...> wrote: A few weeks ago I uploaded LTSpice plots and schematics for other bands, 80m 60m and 20m.
I finally got some time to build the 20m BPF. Even though the plot was good, the BPF did not work. I double and triple checked connections and components, but no go.
So I pulled out the bible (EMRFD) and read up on TTC, triple tuned circuits. I haven't down this kind of math since the 80's and it was beyond me.
Low and behold on Page 6.77 Figure 6.135 was a chart of L's and C's for different bands. So I built the 20m version and it works great.
Once the UPLOAD button comes back, I will load the plot and schematic to the files.
Meanwhile if anyone is interested, I'm attaching ?a plot and schematic.
73
Ken VA3ABN
<Bitx40-20BPF-Plot.png>
<Bitx40-20BPF-Schem.png>
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KF5GLB John