[Premium-Rx] Roofing Filter Question

[Chuck Hutton]

Guy:

I would put the narrow filter first. Its selectivity would reduce (somewhat)
the signal level at every stage past it by eliminating some adjacent
signals, and therefore improve the strong signal handling a bit.

I don't know the 6790 - why does it have two roofing filters at the same
frequency?


Chuck

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Guy Atkins
Sent: Wednesday, March 24, 2004 4:28 PM
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] Roofing Filter Question




I'm replacing one of two 20-kHz, 40.455 MHz roofing filters in the first
I.F. of a RA6790GM with a 10 kHz version for hopefully better dynamic range
on mediumwave.

Should the narrower 10 kHz filter be first in the signal path, or instead be
the 2nd roofing filter in the chain for best performance?

Thanks,

Guy Atkins
Puyallup, WA USA



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