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4wd: Nothing to Worry About?
Oh, WOW! I can forward copies of my post from my Sent folder right back
to the newsgroup again. How annoying. -------- Forwarded Message -------- From: 52 2017 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00800000 X-Mozilla-Keys: Subject: 4wd: OT: Nothing to Worry About? References: md5:ZBXxoIvW5/tfjqCd80T8Kw== Newsgroups: alt.comp.os.windows-10 From: Brantly X-Forwarded-Message-Id: md5:ZBXxoIvW5/tfjqCd80T8Kw== Date: Fri, 2 Jun 2017 17:03:51 -0700 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: md5:ZBXxoIvW5/tfjqCd80T8Kw== Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit -------- Forwarded Message -------- From: 21 2017 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00800000 X-Mozilla-Keys: Subject: OT: Nothing to Worry About? References: Newsgroups: alt.comp.os.windows-10 From: Brantly Date: Fri, 2 Jun 2017 16:59:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit On 06/02/2017 12:55 PM, rickman wrote: As long as you aren't a corral reef. https://xkcd.com/1379/ Or a COREL reef. I bought Adobe Illustrator a long time ago, shoulda bought Corel Draw. But the Student Bookstore didn't have it on the shelf. Here's some copy/paste from a different post. I know he has bought a LPF for his application, but this is for kicks. He had done a 4 resonator BPF design. It had a high spread of inductor values. It was canonical and had over 80 dB of suppression at the 2nd harmonic (ignoring loss). What I have here is a 4 resonator tubular design where all inductors are 10 uH. (Keeping them equal, it is possible for the 50 ohm filter "class" I made to have the inductors anywhere between 6.8 and 27 uH, using the Norton transformer and R-scaling.) Tubular filters are not canonical. The design theoretically has over 90 dB of attenuation at the 2nd harmonic for the Q values given in the ASC file. It is physically symmetrical. The heavy bias of poles at infinity was intentional because the main purpose is harmonic filtering. |
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