kf1z wrote:Wayne,
So, I've taken to using the butterworth T calculator, dividing the cap value by 2 and adjusting it later if need be.
K9ACT wrote:kf1z wrote:Wayne,
So, I've taken to using the butterworth T calculator, dividing the cap value by 2 and adjusting it later if need be.
Turns out that's sort of what I did but I forgot to quantify it. I put variable across the fixed cap and tuned for cleanest sine wave. As the cap was barely meshed, it didn't seem to be worth the trouble but I might have been surprised if I actually measured it.
>50 ohms impedance, cutoff frequency JUST a little higher than the band edge.
This bothers me a bit as I assume the cut off freq is the 3 db point so there would be a 3 db loss at the band edge which does not seem practical. That would be the point to begin the roll off not to be well into it.
Am I missing something?
js
kf1z wrote:I never found any
The closest thing I can think of is use more, shorter cores.
Like FT-114A-61 those are 1.14 inches long 0.74 ID and 0.545 long
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