[Elecraft] KRX3 Filter

[Julian G4ILO]

Great post. That has just validated my decision not to order *any*
narrower filters with my K3. Just the FM filter (for 10 FM) and the AM
filter (for SWL). Narrower filters can go on my Christmas list, if the
experience of other more demanding operators shows that I might
actually get some benefit from them.

-- 
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Ham-Directory: www.ham-directory.com


On 9/15/07, Ed Muns <w0yk at msn.com> wrote:
>
> My advice is "yes", the 2.7 kHz roofing filter is all anyone needs.  The
> narrower roofing filters add nothing the vast majority of time.  Only in
> extreme situations where very strong adjacent signals are present, outside
> the passband but inside the wider roofing filter, will a narrower roofer
> help the DSP do its final filtering job.  I keep reminding people that other
> radios, e.g., the Icom 756 Pro series, have a 15 kHz roofing filter and rely
> on DSP for the final IF filtering, as does the K3.  Only a very few, more
> expensive, radios (Orion, Orion II, Icom 7800, etc.) offer switchable,
> narrower roofers.  And, very few operating situations require the narrower
> filters.
>
> Moreover, adding filters to the K3 in the future is trivial.  They simply
> plug in and a screw is inserted for comprehensive grounding.  Get some
> experience with the radio in your operation scenarios before committing to
> additional filters.