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Re: Help Testing a Low Pass Filter

 

I modeled your 40-Meter LPF using your values on ELSIE. Please see
attachment for the results of what you should measure for pass
characteristics (S21).

Dave - W?LEV

On Thu, Jun 4, 2020 at 12:05 PM GM7 <geeemmseven@...> wrote:

Hi, thanks for the replies.

It's a QRP Labs filter which uses the 7 element design shown in the
attached schematic.

I attached the wrong image in the first post. That's the response of the
40m filter, not the 30m (which was very similar). The values of the 40 m
filter are:

------ 1.3uH ------- 1.7uH ------- 1.3uH ------
| | | |
270pF 680pF 680pF 270pF
| | | |

I'll re-test the 40m filter following David's suggestions and post the
results.






--
*Dave - W?LEV*
*Just Let Darwin Work*

40-METER LPF for EMAIL - 04 JUNE 2020.jpg

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