Re: [IRCA] Winradio G313-E

["Chuck Hutton" <charlesh3@xxxxxxx>]

Hi John:

The filter in any good radio will have a shape factor of about 2:1 using the
6 dB and 60 dB points. (They're pretty much industry standards.)

Guesstimating the 30 dB points, I'd say a 2.7 kHz filter would land around 4
for the 30 dB points. 

A lot of curves are available at http://www.qth.com/inrad/ and then
following the instructions if you want to see some real life curves.


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of John H. Bryant
Sent: Friday, October 13, 2006 9:00 PM
To: brandon@xxxxxxxx; Mailing list for the International Radio Club of
America
Subject: Re: [IRCA] Winradio G313-E

<CLIP>
Where your main DXing filter may be 2.7 kHz wide at 3 dB down, it may be 15
or more wide at 30 dB down.  The result of that is that you use narrower
filters that you really want to, to conquer adjacent channel QRM
<CLIP>
JHB


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