[Yaesu] FT990 upgrades
Fri, 15 Dec 2000 12:56:44 -0500 (EST)
When you select the 250Hz filter, 500Hz filter is cascaded.
I didn't want 250Hz bandwidth, so I got a 500Hz filter for the FT-1000 and
put it in the 250Hz filter location. I now can have much steeper skirts
with the cascded 500Hz filters.
dave - n8it
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.
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