: Re: [Elecraft] Variable bandwidth crystal filter
Joe Subich, W4TV-4 wrote:
>
>
> Where the capability becomes noticeable is on SSB due to the
> wide steps between 2.8 KHz and 1.5 KHz and in digital modes
> with the step between 2.8 KHz and 400 Hz.
>
In digital modes it sho
Joe Subich, W4TV-4 wrote:
>
>
> Where the capability becomes noticeable is on SSB due to the
> wide steps between 2.8 KHz and 1.5 KHz and in digital modes
> with the step between 2.8 KHz and 400 Hz.
>
In digital modes it shouldn't be an issue because you don't, in theory, need
narrow filter
Joe Subich, W4TV wrote:
>
> The beta firmware does not allow setting width in 10 Hz steps. Only
> the center frequency (FC) is adjustable in 10 Hz steps.
>
>
Joe, thanks for this information. Now I get it (I think).
Just to review, about a year ago, we got 10 Hz CW pitch increments with
@mailman.qth.net; joachim.groe...@ewetel.net
> Subject: Re: [Elecraft] Variable bandwidth crystal filter
>
>
> Good review of the flexibility of the K3, Don!
>
> My K3 filter slots are all filled: 2.7, 2.1, 400, 250, and
> 200. Using
> the K3 Utility, I can set the 250 Hz fi
Good review of the flexibility of the K3, Don!
My K3 filter slots are all filled: 2.7, 2.1, 400, 250, and 200. Using
the K3 Utility, I can set the 250 Hz filter to kick in at a DSP
bandwidth of 300 Hz, 250 Hz, or 200 Hz. But with the upcoming firmware
upgrades, the flexibility will be enhance
Chuck,
True, true *BUT* the roofing filter can suppress signals before they get
to the hardware AGC. If one is happy with only the DSP filtering alone,
then do not purchase any roofing filters at all, just go with the stock
2.7 kHz roofing filter. Different strokes for different folks, some
I simply meant that if folks were looking for a more or less
continuously variable selectivity in the K3, then the 10 Hz increment
DSP filters would provide that, for all practical purposes.
73,
Chuck NI0C
Ed K1EP wrote:
> At 8/5/2009 07:51 PM, Chuck Guenther wrote:
>
>> With the upoming 10 H
r.com
- Original Message -
From: "HowardZ"
To:
Sent: Thursday, August 06, 2009 5:47 PM
Subject: Re: [Elecraft] Variable bandwidth crystal filter
>
> It appears that the only way the K3 achieves its high test scores in
> dynamic
> range is when the noise is outside th
It's always a good idea to have the selectivity as early as possible in a
receiver. At the antenna input would be ideal, but no one yet has invented a
truly wide-range tunable filter with the performance of a fixed-frequency
filter at a suitable intermediate frequency (I.F.).
That's why Armstrong
At 8/5/2009 07:51 PM, Chuck Guenther wrote:
> With the upoming 10 Hz resolution DSP upgrade (Firmware 3.23 being
>talked about), I certainly wouldn't see much need for a variable BW
>roofing filter.
Can you explain that relationship?
>73,
>Chuck NI0C
>K2, K3
_
It appears that the only way the K3 achieves its high test scores in dynamic
range is when the noise is outside the roofing filter's bandwidth. Only the
roofing filter yields this high performance.
For example, if your roofing filter is 2.8Khz, but you hear an unwanted
nearby signal, and you use
nesday, August 05, 2009 7:51 PM
>> To: elecraft@mailman.qth.net
>> Cc: joachim.groe...@ewetel.net
>> Subject: Re: [Elecraft] Variable bandwidth crystal filter
>>
>>
>> J.R. Groeger wrote:
>>
>> "I seem to remember talk some time ago about a v
her
> Sent: Wednesday, August 05, 2009 7:51 PM
> To: elecraft@mailman.qth.net
> Cc: joachim.groe...@ewetel.net
> Subject: Re: [Elecraft] Variable bandwidth crystal filter
>
>
> J.R. Groeger wrote:
>
> "I seem to remember talk some time ago about a variable bandwid
J.R. Groeger wrote:
"I seem to remember talk some time ago about a variable bandwidth
crystal filter becoming available for the K3 at some stage. Anyone know
the status of its development?"
With the upoming 10 Hz resolution DSP upgrade (Firmware 3.23 being
talked about), I certainly wouldn't
I seem to remember talk some time ago about a variable bandwidth crystal
filter becoming available for the K3 at some stage. Anyone know the
status of its development?
J R Groeger
DK3NG, G4XXW, EL0AA/MM
K1, K2, K3
__
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