[Elecraft] APF Results at an Old Timer's shack

[Robert Harmon]

Greg,

I agree 100%   It is a tool and is there for the specific use of pulling a weak CW signal up out of the mud 
so you can copy him.  Turn on when needed.  The Yaesu FT1000's, early issues, had great APF 
and had a little ringing but they worked very well, the little ringing goes with the territory with the sharp 
peaking.  You didn't leave them on all the time, really worked well when needed.   Then Yaesu responded
to the issue of the ringing and in later versions the ringing was gone but the peaking was reduced and APF wasn't 
very effective.  Then.............  mods came out to restore the previous peaking effectiveness, (and slight ringing) hi,hi.
I don't know how to best describe it but it is a "sharp"  CW listening experience.
There are other "tools" on the K3, narrow filters, etc that we use for improved copy on CW signals and the APF
is another for really digging in (when needed)

Bob
K6UJ




On Nov 4, 2010, at 8:32 AM, Greg - AB7R wrote:

> I don't see this as something that would be left on ALL the time.  Only used as needed.  It does help make an 
> otherwise unworkable station readable for a contact.  Just another tool in the box.  When you don't need it, turn it off.  I have not tried this yet 
> but you can probably turn it off with a CAT command in the appropriate logger macro in the same way you CLEAR RIT.  Then just turn it on as needed.
> 
> -------------------------
> 73,
> Greg - AB7R
> Whidbey Island WA
> NA-065
> 
> 
> On Thu Nov  4  8:07 , "Jim Cox"  sent:
> 
>> I agree Wes, way too much ringing for my taste.   I have never cared for the 
>> ultra narrow filters myself.
>> I listened using the APF on 80 cw last evening, works well but the 
>> distortion certainly hurts the copy.
>> 
>> Jim K4JAF
>> 
>> 
>> ----- Original Message ----- 
>> From: "Wes Stewart" n7ws at yahoo.com>
>> To: "Elecraft Reflector" elecraft at mailman.qth.net>; "JAMES ROGERS" 
>> w4atk at bellsouth.net>
>> Sent: Thursday, November 04, 2010 9:57 AM
>> Subject: Re: [Elecraft] APF Results at an Old Timer's shack
>> 
>> 
>> To this old dog's ears there is way too much ringing.
>> 
>> Even in my EME days I never felt the need for these super narrow filters. I 
>> used a passive 200 Hz wide filter centered on 600 Hz. A few hours of 
>> listening to noise in a too-narrow filter and you start hearing things that 
>> aren't there, especially with some distortion thrown in, and ringing is 
>> distortion.
>> 
>> Today I prefer a lower beat note (~450 Hz) and a couple of hundred Hz BW is 
>> fine most of the time.
>> 
>> Wes
>> 
>> --- On Thu, 11/4/10, JAMES ROGERS w4atk at bellsouth.net> wrote:
>> 
>> Well, I just wasn't sure I would use it, I had such good results with
>> just the DUAL PB function. So I sought out the weakest signal I could
>> find this morning, R5ZZ, who was not copiable here, but I could hear
>> some Ws working him. I dialed in the APF and there he was, and
>> copiable. So mea culpa. I am now a convert. Old Dogs can learn new
>> tricks.
>> 
>> 73s Jim, W4ATK
>> JIM ROGERS
>> w4atk at bellsouth.net
>> http://web.me.com/jimrogers_w4atk
>> 
>> 
>> 
>> 
>> 
>> 
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