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Re: [IRCA] Winradio G313-E
- Subject: Re: [IRCA] Winradio G313-E
- From: "Chuck Hutton" <charlesh3@xxxxxxx>
- Date: Fri, 13 Oct 2006 22:09:10 -0700
- Thread-index: AcbvRedcoGRp0/qhSx+xrqNfL5NbyAAB7zsw
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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