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[Yaesu] FT990 upgrades

To: <yaesu@contesting.com>
Subject: [Yaesu] FT990 upgrades
From: dgmaley@soli.inav.net (David G. Maley)
Date: Fri, 15 Dec 2000 12:51:41 -0600 (CST)
What problems are you having?  I'm using the standard 8-pole 500hz
filter along with an audio dsp.
Dave   WA0ZZG


On Fri, 15 Dec 2000, Ron Feutz wrote:

> 
> I want to get better CW front end selectivity for my 990.  I am
> currently using the stock 500 hz filter.  Are there any options or mods
> other than the Inrad 250 hz filter for the 990, which I have on order.
> Also, is the 10.94 IF 500hz stock filter cascaded with the 250hz 455 IF
> filter? The manual doesn't say and the QST review is contradictory, with
> one mention saying they work together and another saying they are
> independent.  I'm not smart enough to figure it out from the schematic.
> 
> Ron - WA9IRV
> 
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