1 Khz filter

I still cannot imagine using that wide of a filter on CW during crowded
band conditions however everyone has their preference. I was curious what
the 1khz filter was used for so I posted the question. The popular answer
was CW.  500Hz max is plenty wide for me and in a contest and I often have
other stations running on my filter edges. The same thing occurs on RTTY.
For non-contest expedition style operating I prefer to use the RIT when
too many stations call zero beat.

John KK9A aka P40A, WP2AA etc


Bill Breeden wrote:
Wed Jul 26 12:09:57 EDT 2017

Jim,

I think most K3 owners understand that.  Those who call CQ during
crowded band conditions also understand that their ears will take less
of a beating when using a 1 kHz DSP bandwidth in conjunction with a 1
kHz roofing filter instead of the next wider roofing filter, which, in a
K3 is often a 2.7 or 2.8 kHz filter.  That's the wonderful thing about a
K3, the owner can equip it according to his or her personal preference.
My ears have taking enough beatings over the years from stations outside
of the filter bandwidth pumping the AGC while using lesser receivers to
know that I prefer a tight roofing filter bandwidth so that the stations
outside of my DSP bandwidth have minimal effect on what I am hearing.
I have used my "Field Day" K3 to call CQ during crowd banded conditions
before and after I added the 1 kHz filter and have found the improvement
well worth the price of the filter.  Your mileage may vary.

73,

Bill - NA5DX

On 7/25/2017 10:08 PM, Jim Brown wrote:

> On 7/25/2017 7:11 PM, Bill Breeden wrote:
>> I found that I was missing stations that were calling on the skirts
>> of my 400 Hz filter, so I added a 1 kHz filter.  When I tune the band
>> to answer CQs I still prefer listen through the 400 Hz filter.
>
> It's important to remember that IF bandwidth is determined by DSP, and
> continuously adjustable. The plug-in filters are ROOFING filters --
> their primary function is to protect the DSP from overload by very
> strong stations outside the bandwidth of the DSP IF. They have the
> secondary function of adding the filtering provided by the DSP, and
> when the DSP and the roofing filter are at the same bandwidth, the
> filter skirts become steeper (sharper).
>
> Bottom line -- we don't need to buy a 1 kHz filter to get 1 kHz IF
> bandwidth, because the DSP already provides that. This is not your
> grandfather's radio! :)
>
> 73, Jim K9YC

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