| To: | <tentec@contesting.com> | 
|---|---|
| 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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