[Elecraft] APF in 4.16/2.63 works well!

Fri Oct 29 14:53:30 EDT 2010

>> I'm sorry but I'm not going to sit idly by while some other ham
>> who'sin love with his 1980's FT-1000 dictates why I can't have a
 >> Q setting on my rig. The Q is a necessary part of this feature in
 >> my mind.

If you want a low Q peaking filter, it's already present in the Dual PB
filter.  Select it and use the Width control to set the Q you want.

A low Q peaking filter is not what those who originally proposed the
feature and have advocated regularly for it are after.  As has already
been said, de-Qing the filter currently in Field Test will render it
useless just like Yaesu did when they tried to eliminate the ringing
in the FT-1000D (and like the poor imitation "contour" filter in the
FT-2000/FT-5000/FT-9000).

The K3 Dual PB filter performs better than the "contour" filter in
the FT-2000 that is gathering dust in my closet.  The new APF is
light years ahead of that when used *for the intended purpose.*

Thanks to Lyle and Wayne, K3 users will soon have two tools - each
designed for a different set of operating conditions.  Please do not
dull the scalpel by trying to make it cut lumber.

73,

    ... Joe, W4TV

On 10/29/2010 2:39 PM, The Smiths wrote:
>
> I'm sorry but I'm not going to sit idly by while some other ham who's in love with his 1980's FT-1000 dictates why I can't have a Q setting on my rig.  The Q is a necessary part of this feature in my mind.  This is NOT an FT-1000 this is a K3.  Just because your old rig used to work well for you without a Q has nothing to do with my new rig.
>
> And if you must make comparisons, than you can use the FT-2000 and it's contour filter (APF) which does have it's variable Q and boost level... Both living in the menus... Sorry but times move on, and you should too.  Only the IDEA of the APF was conceived from the FT-1000, not the entire design and implementation... Please don't limit the rest of us.
>
>
>
>
>> Date: Fri, 29 Oct 2010 13:29:12 -0400
>> From: lists at subich.com
>> To: elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] APF in 4.16/2.63 works well!
>>
>>
>>> I would like to be able to ***VARY THE Q*** with the width control and
>>> LEAVE IT ON with a mild Q, and sharpen it as required.
>>
>> The design goal was to duplicate the FT-1000D APF. The FT-1000D has
>> no variable Q function. What you are proposing is completely different
>> than the design parameters ... you want an Autek QF1 not the FT-1000D APF.
>>
>>>> When APF is in there is no moderate setting, it takes over the
>>>> passband and makes copy of a signal up band difficult.
>>
>> That's the goal of the FT-1000D APF ... single signal reception in
>> noise and QRM. If you want a context filter, the original Dual PB
>> filter with it's variable with and shift fill that role.
>>
>>>> ONLY when APF is on could we have the WIDTH tap toggle between APF
>>>> Q displaying APF Q=3 in lower display and between Roofing/DSP
>>>> bandwidth displaying BW 0.40??? You could do the same thing with
>>>> SHIFT to go back and forth between adjusting Roofing/DSP SHIFT
>>>> displaying FC *0.45 and APF *0.45.
>>
>> Width/shift taps are already "taken" if the user has not chosen PB
>> Shift=.01. There is no current requirement to select PB Shift=.01
>> in order to use APF and I hope that *someday* Wayne will give us the
>> ability to use LO-CUT-HI with PB Shift=.01.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>> On 10/29/2010 12:58 PM, Guy Olinger K2AV wrote:
>>> APF has a very significant improvement on weak signals in the noise.
>>> I completely agree with prior posters. HOWEVER...
>>>
>>> I would like to be able to ***VARY THE Q*** with the width control and
>>> LEAVE IT ON with a mild Q, and sharpen it as required. If I can back
>>> it out to 2 dB with a width function I would probably leave that on
>>> all the time and grind in as needed. I already do that with Width in
>>> weak cases that are on frequency. ONLY when APF is on could we have
>>> the WIDTH tap toggle between APF Q displaying APF Q=3 in lower display
>>> and between Roofing/DSP bandwidth displaying BW 0.40??? You could do
>>> the same thing with SHIFT to go back and forth between adjusting
>>> Roofing/DSP SHIFT displaying FC *0.45 and APF *0.45. Using WIDTH to
>>> control Q is intuitive.
>>>
>>> When APF is in there is no moderate setting, it takes over the
>>> passband and makes copy of a signal up band difficult. It will
>>> require repeated use of DUAL PB to go in and out for weak signals and
>>> back out for normal use. Use of a HOLD function as a frequent change
>>> is a problem. In trying to get used to the HOLD on DUAL PB to go in
>>> and out of APF to hear in the rest of the channel, I repeatedly hit
>>> NTCH instead. HOLD's are only good for settings that persist for a
>>> while during operation.
>>>
>>> E.g. I don't need APF ONLY as a better substitute for 50 Hz. I need
>>> it to work ALSO as a milder center emphasis inside the 400 Hz roofer,
>>> and be able to twist a knob somewhere to move between mild and sharp.
>>> Even with what appears to be only a 2 dB peaking around 450, the MP
>>> was improved inside its excellent dual INRAD 400 selectivity.
>>>
>>> If this is not done, it will be very difficult to use it well in a
>>> contest. No easy-to-use variable Q is a deal-breaker for me. In the
>>> end for contests it will cost Q's and will have to tell people to
>>> leave it off, just like NR. Only turn it on for a really weak one if
>>> you can remember how, and then turn it right back off. Then when I
>>> get home chasing weak DX I'll turn it all back on again, and work some
>>> stuff I couldn't hear before.
>>>
>>> 73, Guy.
>>>
>>> On Fri, Oct 29, 2010 at 11:01 AM, drewko<drewko1 at verizon.net>  wrote:
>>>> Yes, I realize that. I would like to compare what is heard using the
>>>> APF filter to what is displayed by BeaconSee with its sub-noise signal
>>>> recovery algorithms.
>>>>
>>>> 73,
>>>> Drew
>>>> AF2Z
>>>>
>>>>
>>>> On Fri, 29 Oct 2010 10:55:38 -0400, you wrote:
>>>>
>>>>>
>>>>> I think you may be confused about what APF is. It is NOT a waterfall or any
>>>>> kind of visual indicator. It IS an Audio Peaking Filter (APF) meant to
>>>>> enhance weak signal audio using the processor between your ears. It will
>>>>> not automatically show you where weak signals are in a spectrum, but if you
>>>>> know approximately where to look (either from a Packet spot or waterfall
>>>>> trace) it can help your ear/brain decode the CW audio buried in noise.
>>>>>
>>>>> 73, Bill
>>>>
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