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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+\[500\]\s+Low\s+pass\s+filtering\s*$/: 2 ]

Total 2 documents matching your query.

1. LF: [500] Low pass filtering (score: 1)
Date: Mon, 16 Apr 2007 00:14:49 +0200
Hi David, I built that Chebyshev low pass filter. the attenuation here is 36dB at the second and 63dB at the third harmonic ? that?s what I expected. now my class D PA can be switched to the 137kHz L
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-04/msg00011.html (10,348 bytes)

2. LF: [500] Low pass filtering (score: 1)
Date: Thu, 5 Apr 2007 19:02:21 EDT
Hi all. I've had a couple of mails asking about harmonic filters for 500kHz transmitters. I sat down today and built a 7 element Chebyshev low pass. It seems quite forgiving on components and gives -
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-04/msg00326.html (8,115 bytes)

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