I can recommend http://www.qth.com/inrad/YAE_MENU.htm I have a FT-1000MP Mark-V
with 250 Hz CW filters.
On my Mark-V I only press the narrow II button an then the filter is working. I
can also choose the narrow I button which is the 500 Hz filter.
I hope this can help you with some of your questions.
73 Jørgen, OZ0J
> I just bought a second hand FT990 AC. It came with buillt in 500 Hz
> (10.9MHz) CW filter. This one has been described as a "CW-wide" filter
> in the manuals book. There is also place for optional "CW-narrow"
> filter, the book reffers to 455 kHz 250 Hz filter which, by my
> understanding is activated by pressing "250" button on the front panel
> of the radio.
>
> Since this one is somewhat too narrow for my taste i'm thinking of
> putting another 500Hz,(this being 455 kHz one) in that slot.
>
> The question is how this one will be activated ? Will it be activated
> together with the other 500 Hz filter (10.9 MHz one) by pressing 500
> button or just as the 250 Hz(455 would be activated, by pressing 250
> button ?
>
> Also, are there any 350 Hz (455) filters available as this would be
> ideal bandwidth for me ?
>
> Any help will be appreciated.
>
> 73 Mike
>
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