K3 Beta Release: APF for CW; "Fast Monitor" & improved TX gate for voice modes

[Greg Buhyoff]

Thanks so much, Wayne, Lyle and the Elecraft crew who worked on this, and
thanks to the alpha and early beta testers.  I downloaded the beta version
earlier this afternoon and used it for a couple of hours of CW operation.
Fantastic!  Have not had anything like this since my FT-1000 days.  My 7800
APF is a virtual joke.

Again, Elecraft continues to provide continuous improvements and
enhancements to an already great radio.  The K3 continues to morph into the
most flexible and option packed piece of equipment I have owned.

73 and thanks again to all for their work and ideas that went into this
including the many members here who gave input.

Greg K2UM
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[Bill [NS4C]]

I loaded the beta firmware so I could see what all the APF buzz was about.
3D2A was spotted on 18070 so I turned the beam and he was there in and out
of my noise level. I turned on the new APF function and peaked the CW
signal. He was now 100% copy. Turned APF off and he was in and out of my
noise level again. Now I understand how good of a tool APF is for weak
signal CW. BTW The 3D2A is in my log.

Many thanks Elecraft,

73  Bill  NS4C

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[John W2XS]

I would also like to thank the Elecraft crew for another great enhancement.  I updated the firmware a few minutes before a local traffic net here.  During the net, I was asked to receive 6 messages from a weak station.  With both the NR and APF turned on, a marginal situation became solid copy.

BTW, this is my 47th firmware update since Beta 2-1 in June, 2008.  I have never had an issue.

73,

John W2XS

[Jan Erik Holm]

Yes APF came out reel good, very well done! Don´t even know if
it was this good on the FT-1000D, at least not on the units I
did own.

Now if only AM RX was to be fixed I would be happy, as it is
right now AM (not sync AM) RX is more or less useless. It "got
broken" in the DSP code way back. I have written about this
problem before and I´m not going to repeat myself any further.

/ Jim SM2EKM
---------------------------------
On 2010-11-04 00:17, Bill [NS4C] wrote:

>
> I loaded the beta firmware so I could see what all the APF buzz was about.
> 3D2A was spotted on 18070 so I turned the beam and he was there in and out
> of my noise level. I turned on the new APF function and peaked the CW
> signal. He was now 100% copy. Turned APF off and he was in and out of my
> noise level again. Now I understand how good of a tool APF is for weak
> signal CW. BTW The 3D2A is in my log.
>
> Many thanks Elecraft,
>
> 73  Bill  NS4C
>

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[juergen piezo]

Hi Jan


I agree. The K3's APF just blows away the APF on both  the IC7600 and IC7700. The K3s APF is in a league of its own.  

I cant stand using my FT1000D anymore with all its peak clipping and IMD on audio peaks. The might dog is  fast becoming a real boat anchor, but sometimes I need 200 Watts of drive sometimes!

One  other thing is the noise gate. Its now perfect with no artifacts at all. You dont even know that its on with heavy processing and gating. The raspy crackly sound is gone. Even with the gating set on  max its operation is perfect.  



73
John



--- On Wed, 11/3/10, Jan Erik Holm <[hidden email]> wrote:

> From: Jan Erik Holm <[hidden email]>
> Subject: Re: [Elecraft] K3 Beta Release: APF for CW; "Fast Monitor" & improved TX gate for voice modes
> To:
> Cc: [hidden email]
> Date: Wednesday, November 3, 2010, 11:10 PM
> Yes APF came out reel good, very well
> done! Don´t even know if
> it was this good on the FT-1000D, at least not on the units
> I
> did own.
>
> Now if only AM RX was to be fixed I would be happy, as it
> is
> right now AM (not sync AM) RX is more or less useless. It
> "got
> broken" in the DSP code way back. I have written about
> this
> problem before and I´m not going to repeat myself any
> further.
>
> / Jim SM2EKM
> ---------------------------------
> On 2010-11-04 00:17, Bill [NS4C] wrote:
> >
> > I loaded the beta firmware so I could see what all the
> APF buzz was about.
> > 3D2A was spotted on 18070 so I turned the beam and he
> was there in and out
> > of my noise level. I turned on the new APF function
> and peaked the CW
> > signal. He was now 100% copy. Turned APF off and he
> was in and out of my
> > noise level again. Now I understand how good of a tool
> APF is for weak
> > signal CW. BTW The 3D2A is in my log.
> >
> > Many thanks Elecraft,
> >
> > 73  Bill  NS4C
> >
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

     
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[P.B. Christensen]

> I agree. The K3's APF just blows away the APF on both  the IC7600 and
> IC7700. The K3s APF is in a league of its own.
Icom doesn't use a peaking filter.  Their implementation of APF is really an
"Audio Passband filter," rather than an "Audio Peaking Filter."   When
engaged, their APF filter skirt is really no different than selecting a
narrow DSP setting where there's a flat top and sharp skirts.  The response
curve does not resemble that of an audio peaking filter.  I found the APF to
be of limited value on the 7800 and 7700 transceivers.

Paul, W9AC

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