"Mark S. Holden" wrote:

Icom does sell a 2.8khz filter for $140 and a 3.3khz filter for $160.

As a follow up, I found a page listing shape factors for Icom filters:

http://www.qsl.net/icom/filters.html

The shape factor on the 2.8khz filters is 1.8 and the 3.3khz one is 1.9

The premium kiwa filters cost less than the Icom ones, and are supposed to have a shape factor of about 1.65.

The crystal filters I installed on my 7030+ have a shape factor of 1.33

So if I was going to add a filter to an R75, I don't think I'd buy it from Icom.