To: | <tentec@contesting.com> |
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Subject: | [TenTec] INRAD Filter Question |
From: | btippett@alum.mit.edu (Bill Tippett) |
Date: | Sat May 24 07:39:50 2003 |
K0CQ wrote: >Steeper skirts and squarer passband corners mean more ringing, and so the Inrad should ring morethan the TT. Steeper and squarer than what? On May 11 I asked: "Has anyone ever made actual 6/60 dB plots of Ten Tec 217, 218 and 219 filters? Or does anyone know if they can be found anywhere on a webpage? I need the filter plots as standalone devices... ...not measured through the radio. Like these at <http://www.qth.com/inrad/tentec_menu.htm>http://www.qth.com/inrad/tentec_menu.htm if you click "Performance Curve Online" (759, 760, 761)." http://dayton.akorn.net/pipermail/tentec/2003-May/033935.html Since I never received a single response I'm still wondering what the Ten Tec filters look like? What is the factual basis for the comments comparing Ten Tec and Inrad filters? Certainly Inrad's #760 8-pole 250 Hz is sharper than Ten Tec's 6-pole #219 250 Hz, but what about Ten Tec's #217 8-pole 500Hz? Does anyone have a plot comparable to Inrad's #759 here? http://www.qth.com/inrad/graphs/759.gif Just curious to know if anyone has found Ten Tec's actual filter curve plots, especially for the #217? 73, Bill W4ZV |
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