Re: Some BCI Filter Notes
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Your photos didn't come across.
73 Mike KG0P
On Sat, Oct 14, 2023 at 5:45?PM David Deitrick < dhdeitrick@...> wrote: Please Change my email from dhdeitrick@...?to dhdeitrick@...
Thank You On Apr 11, 2023, at 3:57 PM, Chuck Carpenter < w5usj@...> wrote:
The filter being considered was from N4ELS, Nelson, using readily available parts
and no toroids to wind. Chokes aren't really all that good so best to use toroids.
The Elsie design plot looks like this:
<dummyfile.0.part>
The important marker data are Transmission Loss, Return Loss/VSWR and Real R values.
The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet.
I may have one around someplace to do a VNA check with.
K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one.
I believe I figured out the Elsie design and the plot looks like this:
<dummyfile.1.part>
Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other.
The marker data show just how good the can be. I won't disclose the design values used for the plot.?
Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.?
Fun Stuff...
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