Yes but those sources doesn´t speak.

/ Jim
------------
On 2010-01-26 17:16, Doug Faunt N6TQS +1-510-655-8604 wrote:
> Early versions of the firmware did, in fact, allow transmission
> through the 2.1kHz filter, and that capability was removed.  I suggest
> that speculation is futile, since there are authoritative sources
> available.
>
> 73, doug
>
>     Date: Tue, 26 Jan 2010 08:41:18 +0000
>     From: "David Woolley (E.L)"<for...@david-woolley.me.uk>
>
>     One possibility is that the rig has only been type approval tested in
>     that configuration, so anyone wanting to operate it with a different
>     filter would require a professional RF spectrum analyzer.
>
>     Top posted through policy, not belief.
>
>     Brian Machesney wrote:
>     >  reflector. The only "authoritative" information I found information 
> was this
>     >  from July 2008:
>     >
>     >  "Until further information to the contrary is available from Elecraft, 
> you
>     >  must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM
>     >  transmit filter must be 6 kHz and the FM transmit filter must be 13 
> kHz. Any
>     >  other settings will result in failure and a ERR TXF (Error TX Filter)
>     >  message.
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