Re: QRP Labs Low Pass Filters
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Steve, I just entered the L and C values that QRP Labs lists for the 20 meter LPF into AADE filter Design.? The analysis shows only a .03 dB loss at 14.5 MHz and doesn¡¯t exceed 1.5 dB until above 15.5 MHz.? I suspect you¡¯ll have to measure and tweek your toroids to get close to the values that QRP Labs calls out for their 20 meter filter. Mike K5ESS ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Steve Hunt
Sent: Friday, March 17, 2017 4:51 PM
To: [email protected]
Subject: Re: [BITX20] QRP Labs Low Pass Filters ? Hans - thanks for that. Maybe I just got unlucky with a combination of capacitor and toroid Al tolerances. I think I've seen the figure of 10% quoted by Micrometals for the Type-6 material. ? Steve G3TXQ
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