Posted by
The Smiths on
Oct 26, 2010; 2:24am
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5673171.html
Wes, I think that you're missing the point of what the shift knob does.. Yes, you can use the RIT to tune someone in but the Shift shifts your IF without moving your Transmit or Receive VFO position. This isn't about a tone, this is about the IF passband.
As for the need for separate IF shift and APF tuning, If I can answer for my self... I would want it to be separate to control noise, if it works anything like the Yaesu contour filter (when in peak mode) than it's very nice to be able to peak signals that aren't always exactly in the center of your IF passband. Not only does the Yaesu peak the center of the IF (pitch freq.) but it would also attenuate the noise floor around it. Therefore if I have noise in the center of the IF, and I want to shift away, I may still wish to move the peak to suppress the QRM along with it.
Sometimes you just have to try something to understand it. Being able to take the dial and swing it around with the APF on and hear what peaks and what suppresses will let you determine how you want to separate the IF pass band from the APF. It's not unlike how the manual Notch filter works. As you swing it around you can hear how it suppresses some signals below or above your IF passband.
Wayne, I would like to make my suggestion for where to place these controls. If it were up to me (with out giving it any more thought than I already have) I would like to see the "switch" to turn the APF on and off as a HOLD on the AFX button. If I'm not mistaken this button is un-used when in CW and SSB mode. Therefore if you hold the AFX button down in CW it could activate the "effect" of the APF... As for moving it's position, I was thinking that unless it's going to be used in SSB mode, you could place the centering position on the Comp/PWR knob. Put it in the place of COMP. Even if someone wanted to use it for SSB mode they probably already have their Compressor set up as they use it for their mic. I don't know that most people use their COMP control every time they get on SSB. I would think you set it up for that particular mic and leave it. This would make dual use of the Comp knob while still keeping the Width and Shift knobs operate as they already do. If i
t's possible to change the color of the LED I would switch it to Orange or blink when in the APF mode as an indicator that it's not working the COMP.
> Date: Mon, 25 Oct 2010 19:17:16 -0700
> From:
[hidden email]
> To:
[hidden email]
> CC:
[hidden email]
> Subject: Re: [Elecraft] APF For K3: progress report
>
> There's a button labeled "RIT" and an associated knob especially for that purpose.
>
> --- On Mon, 10/25/10, Wayne Burdick <
[hidden email]> wrote:
>
>
> For the same reason that they want to use SHIFT: because sometimes
> stations call you off-frequency.
>
> Wayne
>
> On Oct 25, 2010, at 6:50 PM, Wes Stewart wrote:
>
> > Wayne,
> >
> > Understood, but why would anyone want to have a filter peaked at
> > other than the nominal sidetone pitch? I realize people are asking
> > for it, but it makes zero sense to me.
> >
> > Wes
>
>
>
>
>
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