http://elecraft.85.s1.nabble.com/K3-APF-Adjustable-Q-tp5688670p5692850.html
> You've brought that up several times, Joe, but that is not the sound,
> and how do you use it in CW with Shift increment at .01, particularly
> with DUAL PB turning APF on and off? 73, Guy.
>
> On Sun, Oct 31, 2010 at 4:47 PM, Joe Subich, W4TV <
[hidden email]> wrote:
>>
>>>> What I have been trying to point out is that there is a general
>>>> benefit for a milder shape, that one MAY leave on all the time,
>>>> and tweak to tight as needed.
>>
>> If you want a "milder" shape, use Dual PB filter with a 400 - 500 Hz
>> background and 100 Hz foreground. That can certainly be left on
>> all the time and the APF switched on when needed ... at least once
>> all of the controls have been programmed.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 10/31/2010 12:03 PM, Guy Olinger K2AV wrote:
>>>
>>> I'd say for variable Q, the tightest setting should be just what is
>>> there now. So no one is losing anything.
>>>
>>> What I have been trying to point out is that there is a general
>>> benefit for a milder shape, that one MAY leave on all the time, and
>>> tweak to tight as needed. MP's EDSP, 450 Hz sidetone, NR=D, Contour=
>>> 11 oclock as an example of a mild contour that is really helpful.
>>>
>>> Being able to tune the APF tight setting around allows me to match the
>>> "tone" of the almost ring to the remembered tone of the weak station
>>> and have it come up when I hit it.
>>>
>>> If the choice is sharp or no APF and no APF tune, I have to RIT the
>>> station to sidetone. This has a couple of disadvantages.
>>>
>>> First, if running in a contest, and there are very loud stations up
>>> and down (aren't there always?), RIT up and down is going to let the
>>> co-channel guys in under the roofing filter and into pre-APF digital
>>> space. That can't be useful. Second, continuing to tune the station
>>> in becomes hard if the station stops or fades out because there is
>>> nothing to "calibrate" the completion of RIT twiddle other than
>>> hearing the tone from the station move to sidetone, and now it's
>>> stopped or faded.
>>>
>>> The presence of APF tune, or variable Q does not disadvantage anyone
>>> who doesn't need them, the same way all the really neat digital stuff
>>> does not disadvantage the straight CW operators. The current setting
>>> and shape of APF is definitely the right max Q setting, and does very
>>> well for me.
>>>
>>> I just want a mild Q setting to imitate the shape I had with the MP
>>> all those years. Those who hear it will get it, just like those that
>>> hear the sharp APF for the first time and try it, get it. I think a
>>> lot of people will leave a mild Q on ALL THE TIME for general
>>> operating. It lowers the level of the stuff up and down a little
>>> without any ringing, but still allows one to hear up and down for off
>>> frequency callers. For me it's an EASIER listen for hours on end.
>>>
>>> 73, Guy.
>>>
>>> On Sun, Oct 31, 2010 at 10:47 AM, Steve Ellington<
[hidden email]>
>>> wrote:
>>>>
>>>> If the caller is off frequency I would just use RIT to center him in my
>>>> passband as usual and let APF do it's thing.
>>>> Having used outboard APFs for years, the ability to adjust it's
>>>> selectivity
>>>> is very important. If the band is quiet and the signal is very weak, I
>>>> would
>>>> adjust the APF nearly to the point of oscillation then back it off a tad.
>>>> If
>>>> the signal is weak but there is a lot of QRN, I would back off the
>>>> selectivity a bit further but still take advantage of some extra peaking
>>>> capability.
>>>>
>>>> N4LQ
>>>> Steve
>>>>
>>>> ----- Original Message -----
>>>> From: "Joe Subich, W4TV"<
[hidden email]>
>>>> To:<
[hidden email]>
>>>> Sent: Sunday, October 31, 2010 10:27 AM
>>>> Subject: Re: [Elecraft] K3 APF Adjustable Q
>>>>
>>>>
>>>>>
>>>>>>> however the fixed Q has a bit of ring and at times I would like to
>>>>>>> back it off (widen) it just a tad.
>>>>>
>>>>> This is the same mistake Yaesu made in the FT-1000D; de-Qing the
>>>>> original APF made it useless in later radios. This is the very
>>>>> reason not to add adjustable Q or reduce the Q of the APF currently
>>>>> in field test. If you want a less aggressive filter that is centered
>>>>> on the sidetone, use Dual PB ... that's exactly what it is designed
>>>>> to do (and it does a very good job when used as designed).
>>>>>
>>>>> Adjustable center frequency is very important ... particularly when
>>>>> PB CTRL is set for Shift=.05 (to allow LO-CUT-HI to function) as
>>>>> the 50 Hz increments too course to tune APF using the VFO. The user
>>>>> also needs the ability to adjust the peak independently in order to
>>>>> peak up an off frequency caller and not "chase them up the band."
>>>>>
>>>>> 73,
>>>>>
>>>>> ... Joe, W4TV
>>>>>
>>>>>
>>>>> On 10/31/2010 8:58 AM, Steve Ellington wrote:
>>>>>>
>>>>>> If I had a choice between variable center frequency and adjustable Q, I
>>>>>> would choose adjustable Q.
>>>>>>
>>>>>> My logic is: The center frequency automatically follows the sidetone
>>>>>> frequency so I have no need to adjust it however the fixed Q has a bit
>>>>>> of
>>>>>> ring and at times I would like to back it off (widen) it just a tad.
>>>>>>
>>>>>> Otherwise it's a HUGE improvement, sounds great and I wish to thank
>>>>>> those
>>>>>> who made it possible.
>>>>>>
>>>>>> 73
>>>>>> N4LQ
>>>>>> Steve
>>>>>>
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>>>>> ______________________________________________________________
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>>
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