KRX3 Filter

[Roy Morris-6]

Does a 2.7Khz filter come as a standard filter with the KRX3 receiver?  Roy  W4WFB
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[Ed Muns, W0YK]

> Does a 2.7Khz filter come as a standard filter with the KRX3
> receiver?

Yes.  See the K3 order web page.

73,
Ed - W0YK

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[Thom LaCosta]

On Fri, 14 Sep 2007, Ed Muns wrote:

>> Does a 2.7Khz filter come as a standard filter with the KRX3
>> receiver?
>
> Yes.  See the K3 order web page.

My understanding is that with that filter and the DSP, if one is not
heavily into contests and isn't in an area with 30 + over 9 sigs, the other
filters may not be a requirement, even though a nicety.

I'd love some feedback form any of the beta testers who may have operated
with the minimal kind of filtering.

Thanks....

73 - k3hrn
Thom,EIEIO
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[Ed Muns, W0YK]

> >> Does a 2.7Khz filter come as a standard filter with the KRX3
> >> receiver?
> >
> > Yes.  See the K3 order web page.
>
> My understanding is that with that filter and the DSP, if one
> is not heavily into contests and isn't in an area with 30 +
> over 9 sigs, the other filters may not be a requirement, even
> though a nicety.
>
> I'd love some feedback form any of the beta testers who may
> have operated with the minimal kind of filtering.

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.

73,
Ed - W0YK

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[Thom LaCosta]

On Fri, 14 Sep 2007, Ed Muns wrote:

>>>> Does a 2.7Khz filter come as a standard filter with the KRX3
>>>> receiver?
>>>
>>> Yes.  See the K3 order web page.
>>
>> My understanding is that with that filter and the DSP, if one
>> is not heavily into contests and isn't in an area with 30 +
>> over 9 sigs, the other filters may not be a requirement, even
>> though a nicety.
>>
>> I'd love some feedback form any of the beta testers who may
>> have operated with the minimal kind of filtering.
>
> 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.

Thanks....once the K3s show up, I have a suspicion that folks will be comparing
notes with nearby neighbors who did get extra filters.  Might be real
interesting if someone could record some weak signals using different filters
and make them available.

73 - k3hrn
Thom,EIEIO
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[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 <[hidden email]> 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.

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