[Elecraft] [K3] Variable filters? And what filter is best for AM broadcast reception?

[Thomas Horsten]

Hi,

I read somewhere, some time ago, that there was a plan to introduce variable
filters to the K3.

Do any such filters exist, either as 3rd party mods or official by
Elecraft/Inrad? And is there any firmware support for this?

I already have 2*2.7kHz and 2*500Hz in my K3, plus a 2.1kHz in the main
receiver only, but I would like a wider filter for AM-broadcast SWL and AM
TX/RX.

Also, I would like to listen to shortwave broadcast stations so I was
planning to get the KBPF3 and additional filters. As far as I can tell the
best filter for this would be KFL3B-FM, to capture the wide signals of the
broadcast stations in the highest possible quality, is that correct or is
the KFL3A-6K more useful? And can I transmit 6kHz AM with the 13kHz FM
filter or must I have the 6kHz one as well?

73, Thomas M0TRN