I think what you are seeing is this.
When you put the 570 in cw mode, the filter button will allow you to set the
bandwidth on the audio filter.  If you have a 500 hz filter installed, the
radio will select it when you narrow the bandwidth below this.  If you put
the radio in ssb mode, the filter will allow you to select the 1800 hz
filter if it isn't there.  If you try to select the filter when there isn't
one installed, you will see a large drop in the volume.  You will also see
this effect if you activate the 500 hz filter and try to select it when it
isn't installed, on cw of course.
I have tried this, and it does behave in this way.
I hope this helps.
Clarence (wd8bah)

----- Original Message -----
From: "Richard Fiorello" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, July 11, 2005 8:04 PM
Subject: Re: ts 570


> Hi John;
> Maybe the problem is simply that I haven't used this filter in quite a
> while.  I tried a full reset and nothing changed.  Since the filter is
> operating just fine I guess I'll be a happy customer.  The manual seems to
> suggest that the radio will select the correct filter which leaves me
> wondering why they put in that set of menu choices.  I very much wish that
> the 570 would let you plug in two if filters but some things can't be
> changed. Thanks for comparing notes.
> Rich
> ----- Original Message -----
> From: "John Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, July 10, 2005 3:25 PM
> Subject: Re: ts 570
>
>
> That's strange because I have no filters in mine and when I hit the filter
> button nothing happens, if I use the multi function knob it just changes
> frequency. maybe you don't need to turn on menu 46? maybe something's up
> with my radio?
> ----- Original Message -----
> From: "Richard Fiorello" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, July 10, 2005 3:07 PM
> Subject: ts 570
>
>
> I am still fiddling with the 570 and I may have to do the unthinkable and
> hunt up the book.  When I go to menu 46 and select no filter I can still
> hit
> the filter button and change the band width.  When I select the filter
> option in menu 46 and hit the dreaded filter button absolutely nothing
> seems
> to change.  Either there is a problem with the cw filter which is doubtful
> or I'm leaving out a very basic step.
> Rich