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You made a high pass filter, not low
On 6/10/2018 9:12 PM, Peter Parker wrote:
I've been experimenting with various types of low pass filters
to cure BCI.
My starting point was the VK3IL design. Then I changed the
values to use prewound 2.2 uH RF chokes I had. Increasing the
capacitors by a similar factor (approx 1.5 times) dropped the
cut-off frequency to around 2.5 MHz. This may offer somewhat
less attenuation of the broadcast band but does mean that the
uBitx will tune WWV on 2.5 MHz without too much loss. Also 160m
reception should be possible on stronger signals. The big
benefit (for some) is there's no need to wind your own toroids.
And you can use conventional components on a small circuit board
that can be sawn to make the pads.
I'm pleased with its performance. More in this video.
73, Peter VK3YE