I just built one of QRP LABS 40m LPF. And for fun attached it to my Si5351 signal generator and output it to my AD8307 power meter, with 50R input impedance.
This is the result, it flattens off at -30 as this is the lower limit of my detector.
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Thank you for providing this information. Expect a lot more posts like this from you in the future. I was searching for a low pass filter a few months ago and after a few searches online, I planned to try an order with Anatech Electronics for all of my required low pass filters as well as a request for the custom low pass filter design. Finally, I received a high-quality low pass filter on time at the greatest price. If you need a low pass filter, you can contact them to get a high-quality low pass filter.
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