ssage -
From: "Bob Lanning"
To:
Sent: Tuesday, January 25, 2011 3:11 PM
Subject: [Elecraft] APF effectiveness...
> APF ringing and over powering...
>
> I have had input from two Elecraft support fellows one of which was
> helpful. That being move the receiver off frequency (RI
APF ringing and over powering...
I have had input from two Elecraft support fellows one of which was
helpful. That being move the receiver off frequency (RIT) about 10Hz
then adjust the APF center frequency to match. Some help - yes.
But...
The Elecraft implementation of APF in MCU 4.22 just
Bob, I'm not sure how you are using the APF but I'll make a few general
comments from my experience with it. The APF is intended for occasional use
only on weak signals that aren't much above the noise level. And when used,
it requires careful fine tuning so that the signal is precisely centered
Is there away for the user to adjust the APF? It is over powering and
ringing.
73,
Bob - W6OPO
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraf
Did I see recently that the guys were working on a audio peak filter
for SSB too? I seem to remember a one line post about it a while ago.
If so, any idea when it will be in BETA?
John
K2QY
__
Elecraft mailing list
Home: http://mailman.q
Just wanted to say I had a chance to try out the APF function in the new
firmware release a couple of days ago. I was working a NJ station on 17 m
when the band QSB took him down to the noise level. With APF kicked in,
and fine tuned, he was fully readable. Had another opportunity to do the
same on
It's been a while since the APF has really pulled out a signal for me that
was otherwise impossible to copy. As W4ZV has said, its effectiveness seems
dependent on the band condx (QRN vs signal strengths, etc). This morning
the APF allowed a weak V73QQ to pop out of the noise on 160M. Tuning wit
man.qth.net] On Behalf Of k5nu
Sent: Tuesday, December 07, 2010 3:19 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] APF
Fellow Elecrafters,
Many of you have praised the current version of apf. Since I spend 99%
or more of my time listening for weak signals on 80m, it should be a
very usefu
is is horribleTry
backing down the AF gain just to the point that you hear the desired tone
and not the other junk. 73
Steve N4LQ
- Original Message -
From: "Sam Morgan"
To: "k5nu" ;
Sent: Tuesday, December 07, 2010 3:30 PM
Subject: Re: [Elecraft] APF
> sorry
sorry to fast on the trigger
in my pea brain I had transposed the
"apf quite uneffective with the NR on"
into 'NR was quite ineffective on cw'
my bad
GB & 73
K5OAI
Sam Morgan
On 12/7/2010 2:26 PM, Sam Morgan wrote:
> I remember seeing it said that, using the NR was useless when you were using
>
I remember seeing it said that,
using the NR was useless when you were using narrow cw filters
6) NR is rarely useful if the bandwidth is narrow. If you set your CW width to
400 Hz or less, for example, there is no point in running NR *unless* you want
to use it as a sort-of "smart squelch."
ht
Fellow Elecrafters,
Many of you have praised the current version of apf. Since I spend 99%
or more of my time listening for weak signals on 80m, it should be a
very useful adjunct. How do you utilize the apf - with NR on or off?
My particular preference for listening keeps the NR on - never
Another suggestion: Learn when to tap and when to hold.
Jim K4JAF
- Original Message -
From: "Brian Alsop"
To:
Sent: Monday, December 06, 2010 8:41 AM
Subject: Re: [Elecraft] APF Ergonomics
> Hardily agree with the APF lover's option. Maybe that's b
Hardily agree with the APF lover's option. Maybe that's because I
suggested it first! The XFIL problem is real and can easily be avoided
with such an option.
73 de Brian/K3KO
On 12/6/2010 13:58, Ian White GM3SEK wrote:
> Don Wilhelm wrote:
>
>> On 12/6/2010 7:04 AM, Tom Williams wrote:
>>> Of
On Mon, 6 Dec 2010 13:58:12 +, Ian White GM3SEK wrote:
> Don Wilhelm wrote:
>
>>On 12/6/2010 7:04 AM, Tom Williams wrote:
>>> Of all the available buttons, I'd still like to know why
XFIL-DUAL PB
>>>was chosen and not some other that had no secondary function
that
>>>could be used on CW.
>>
>
Don Wilhelm wrote:
>On 12/6/2010 7:04 AM, Tom Williams wrote:
>> Of all the available buttons, I'd still like to know why XFIL-DUAL PB
>>was chosen and not some other that had no secondary function that
>>could be used on CW.
>
>Because it is most like Dual PB, and it cannot be used if Dual PB i
Never used the dual PB button until the APF solution came along.
The name of the button fits the APF. No need to change that imho.
73
Arie PA3A
Op 6-12-2010 13:04, Tom Williams schreef:
> I'm not talking about the primary button function - AFX is still available.
> APF would be the "HOLD" func
Tom,
Because it is most like Dual PB, and it cannot be used if Dual PB is in
effect. The menu permits the choice of either Dual PB or APF when in CW
mode. Dual PB still works the same as before for digital modes.
73,
Don W3FPR
On 12/6/2010 7:04 AM, Tom Williams wrote:
> Of all the availabl
I'm not talking about the primary button function - AFX is still available. APF
would be the "HOLD" function for that button.
Of all the available buttons, I'd still like to know why XFIL-DUAL PB was
chosen and not some other that had no secondary function that could be used on
CW.
73,
Tom N
On 12/5/2010 1:54 PM, n...@roadrunner.com wrote:
> I would have preferred using the AFX button for enabling APF, since it is an
> audio effect and the second function doesn't apply to CW.
>
??
I use my afx in the BIN setting in cw or ssb,
"which provides a constant phase shift between the left
I always have the contest program "WriteLog" open when I'm using my K3. (I
use it for contests and general logging). In WriteLog I set up the multiply
key on my PC keyboard to toggle the APF. Press once to turn it on. Press
again to turn it off. I don't think I've ever used the XFIL button for APF
You certainly can do that. All you have to do is write a macro containing
the command "SWH29;" and assign this macro to one of the programmable keys,
M1-M4 or PF1 or PF2. You can just use a single command in a macro if that's
all you want.
Sometimes I'll assign a macro to both the tap and hold fu
Tom,
I think you can use PF1 or 2 to select the APF. This will still
require a "hold", and an inadvertent tap will interfere with the RIT
setting. Don't know if this will be better. I don't use my RIT so I
like this set up. Maybe a "slight" firmware change would allow each
user to defi
Why was the XFIL button chosen to enable APF? Is it because you can't have APF
and Dual PB at the same time? This weekend I found myself inadvertently
changing the XFIL instead of enabling APF. Pileups get quite interesting when
switching to a 2.7kHz roofer by mistake.
I would have preferred us
APF addition to the K3 is outstanding. Used it for the first time yesterday.
After completing a cw qso, was about to turn off the rig when I thought I
heard "xb" in the noise. So I pushed in the APF button and turned the shift
knob, "Bingo" a good 569 S51WO (Sam) was calling me. Worked him with ea
I finally got to use the APF in reel life, I´m not too
active these days.
Wanted to work the ZL8X boys on 160 so went out to the
radio station and brought the K3 with me and fired the
big rig up.
All I can say is that the APF is excellent. ZL8X was weak
as water but with APF it was possible to copy
Hello Group,
Just thought I would add a comment about the APF. I was ragchewing on cw in
the 40 meter band. After
signing with the station I was about to turn of the K3. I thought I heard xb
in the noise. SoI pushed in the APF button and slightly turned the shift
knob. Bingo! clear as a bell 569 c
I agree. If you want a lower Q APF, just use 50hz dsp selectivity without
APF.
50hz dsp selectivity is an amazing contesting tool to isolate dx from the
calling pileup.
73, Barry N1EU
Robert Harmon wrote:
>
> It is interesting that some of us do not experience "too much
> ringing" with th
Igor, N1YX
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Harper
> Sent: Monday, November 29, 2010 7:25 PM
> To: Elecraft
> Subject: [Elecraft] APF in CQWW; and DXing in general w/K3
>
> The past
adjusted with main VFO in FINE
mode. Just an opinion.
73,
Igor, N1YX
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Harper
Sent: Monday, November 29, 2010 7:25 PM
To: Elecraft
Subject: [Elecraft] APF in CQWW; and DXing
The past weekend's CQWW was the first time I've had the opportunity to use my
new K3 in those types of band conditions and I'd been looking forward to doing
just that. I S&P'ed the whole 'test and used it to tweak and twiddle with the
K3's various functions, notably the NB settings.
I didn't us
On Mon, 8 Nov 2010 21:49:44 -0500, S Sacco wrote:
1. The notch filter only works in MANUAL mode in CW mode. When it is in manual
mode you have to adjust the notch the carrier using the VFO B knob.
2. The APF does not work when you TAP the XFIL button. That changes the filter.
You have to HOLD
est to
just put it there instead. The N/A reminder would tell people when they need to
turn one or the other off...
> Date: Mon, 8 Nov 2010 21:49:44 -0500
> Subject: Re: [Elecraft] APF suggestion
> From: nn4x.st...@gmail.com
> To: notforc...@hotmail.com
> CC: elecraft@mailman.qth.
t my opinion.
>
>
>
>
>
>> Date: Mon, 8 Nov 2010 21:04:50 -0500
>> From: nn4x.st...@gmail.com
>> To: Elecraft@mailman.qth.net
>> Subject: [Elecraft] APF suggestion
>>
>> I've been enjoying the APF quite a bit.
>>
>> My only sugge
That's the problem dumping too many functions into one box, I think. I have
an Elecraft AF1 Audio Filter between the K3 and my phones. It's an active
filter offering the same bandpass characteristic as the APF using analog
devices except that it also offers two selections of "Q".
I can't decide w
t my opinion.
>
>
>
>
>
>> Date: Mon, 8 Nov 2010 21:04:50 -0500
>> From: nn4x.st...@gmail.com
>> To: Elecraft@mailman.qth.net
>> Subject: [Elecraft] APF suggestion
>>
>> I've been enjoying the APF quite a bit.
>>
>> My only sugge
aft@mailman.qth.net
> Subject: [Elecraft] APF suggestion
>
> I've been enjoying the APF quite a bit.
>
> My only suggestion, mirroring what some other folks have said, would
> be to have it enabled by the "NTCH" button rather than the "XFIL"
> button.
I've been enjoying the APF quite a bit.
My only suggestion, mirroring what some other folks have said, would
be to have it enabled by the "NTCH" button rather than the "XFIL"
button.
I find myself sometimes switching through the different filters when I
really want the APF.
73,
Steve
___
that are trying to be helpful. Now,
this is enough of this topic. Thank you for your input. We'll leave it here.
This doesn't even belong on the reflector.
> Date: Sun, 7 Nov 2010 09:04:35 -0700
> From: xda...@cis-broadband.com
> To: elecraft@mailman.qth.net
> Subject:
Mike,
Don's explanation is good. Remember, AGC does not "bring up" the level
of any signal ... only the audio gain control will do that. AGC simply
*reduces the IF gain for signals above the AGC threshold*.
Although it is intended as an analysis of the K3's AGC behavior, the
study by Jack Smit
those
> that DO try to help others. It would be time better spent. END OF.
>
> Sorry Eric, but I just feel like Joe is out here like a shark circling around
> looking for someone to bite.
>
>
>> Date: Sat, 6 Nov 2010 20:48:14 -0400
>> From: li...@subich.com
>> T
Thanks Don.
No, I wouldn't want all sigs to have the same audio level. I'll play with AGC
off,
and the limiter, and the AGC settings.
Mike
On 11/6/2010 9:20 PM, Don Wilhelm wrote:
> Mike,
>
> The AGC works at the IF level, not the audio level.
> What that means is if you crank the AF gain way
Yes!
And to avoid some potential ear damage as well. Normally I wear phones, and I
think
that blast may have caused bleeding if I'd had them on then >:o
Mike NF4L
On 11/6/2010 11:51 PM, Joe Subich, W4TV wrote:
>>> Since very weak signals (which is what APF is all about) are well below
>>>
l, really
> wasn't!. What
> you were actually hearing is proper Dynamic range you should have. So the
> volume
> control still comes into play.
>
> I'll send you a copy of my AGC tutorial offline. I hope this helps you out
> some.
>
>
> > D
>> Since very weak signals (which is what APF is all about) are well below
>> the level that AGC action starts, when trying to dig out such a weak
>> station, it may be wise to turn off AGC altogether (provided you have
>> set the AF limiter beforehand).
It might be wise to ask Wayne and Lyle to
Well said, Dave. I agree completely and this kind of response is why I
took the K3 plunge. So far I am pleased with both the radio and the
interaction we owners of the Elecraft products recieve from the owners
and staff at Elecraft. Good show, gents.
73, de Nate >>
--
"The optimist proclaims
K3 #4522
-- Original Message --
From: "David Yarnes"
To:
Subject: [Elecraft] APF et al.
Date: Sat, 6 Nov 2010 19:53:49 -0700
I just want to thank Wayne, Eric, and the gang for taking us beyond the
original definition of what a K3 could do. Yes, I know, we're having a
l
Um, Joe, he did not say "bring up" as you quoted. Are you certain that by
saying "bring to the level" he did not mean bring louder signals *down* to
the level of the AF gain? That's how I read it.
Your observation about the best AGC operation is excellent for
communications work. Often people have
I just want to thank Wayne, Eric, and the gang for taking us beyond the
original definition of what a K3 could do. Yes, I know, we're having a
little problem getting the APF right, but does anyone really thing it won't
be right in the end? I don't. And I suspect there may be a few other
"goo
vember 06, 2010 7:13 PM
To: li...@subich.com; Elecraft Reflector
Subject: Re: [Elecraft] APF and audio limiting
If I said black you would say white. What's the difference. Fine, it's not
bringing the level UP to the AF Output, it's setting it TO the AF output
according to the slope set
Mike,
The AGC works at the IF level, not the audio level.
What that means is if you crank the AF gain way up to listen to a very
weak signal, AGC action is probably not even started because the signal
level is at or near the level of the band noise - In other words, the
receiver is operation
Sorry Eric, but I just feel like Joe is out here like a shark circling around
looking for someone to bite.
> Date: Sat, 6 Nov 2010 20:48:14 -0400
> From: li...@subich.com
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] APF and audio limiting
>
>
> >> Remem
't!. What you were actually hearing is
> proper Dynamic range you should have. So the volume control still comes into
> play.
>
> I'll send you a copy of my AGC tutorial offline. I hope this helps you out
> some.
>
>
>> Date: Sat, 6 Nov 2010 19:46:11 -0400
>>
46:11 -0400
> From: n...@nf4l.com
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] APF and audio limiting
>
> Thanks Tom.
>
> Well, I kinda thought it shouldn't blast my ears that hard. Audio *WASN'T* up
> too
> loud for the signal I was after. Maybe I don&#
Thanks Joe.
Well, AN answer is in the manual, I'm not sure it's the only one possible.
Software
(up to a point, but I don't know what that point is in this case) is flexible
:-P .
On 11/6/2010 6:53 PM, Joe Subich, W4TV wrote:
> AF LIM only applies when AGC is off.
> The answer is in the manual
Thanks Tom.
Well, I kinda thought it shouldn't blast my ears that hard. Audio *WASN'T* up
too
loud for the signal I was after. Maybe I don't understand what AGC does. That's
why I
asked the questions I did.
On 11/6/2010 6:21 PM, Amateur Radio Operator N5GE wrote:
> On Sat, 06 Nov 2010 18:04:
AF LIM only applies when AGC is off.
The answer is in the manual.
73,
... Joe, W4TV
On 11/6/2010 6:21 PM, Amateur Radio Operator N5GE wrote:
> On Sat, 06 Nov 2010 18:04:18 -0400, Mike wrote:
>
> Sounds normal to me.
>
> Audio up too loud and APF on, then a strong signal transmits on the f
On Sat, 06 Nov 2010 18:04:18 -0400, Mike wrote:
Sounds normal to me.
Audio up too loud and APF on, then a strong signal transmits on the frequency
you are listening to
What do you think it SHOULD have done? You didn't say.
Tom
Radio Amateur N5GE
>On 11/4/2010 9:48 PM, Mike wrote:
>> I'm
Anybody keeping track of the longest time for an unanswered post? Over over.
;->
On 11/4/2010 9:48 PM, Mike wrote:
> I'm playing with the new APF, and trying to get a REALLY weak QSO to pop. I
> have the
> volume cranked up pretty good, and a REALLY strong station throws in their
> call. I
>
The passband shape is that of an inverted "V" with a sharp tip. While
this can be remarkably useless for tuning around, the regular passband
shapes being better for that, once a real weakie is discovered, tuning
the APF to it creates an immediate signal to noise improvement. It is
so narrow thoug
Why is it that the APF is more effective than a narrow ordinary
DSP filter?
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This
Very nice Barry. Good demo.
Ron AC7AC
-Original Message-
If anyone is interested, I posted a recording of APF in action (on/off)
listening to RA0FF this morning on 160M. I also plotted the passband
spectrum of APF filtering.
http://n1eu.com/k3/k3_apf.htm
(or simply go to n1eu.com and lo
Barry N1EU wrote:
>
> If anyone is interested, I posted a recording of APF in action (on/off)
> listening to RA0FF this morning on 160M. I also plotted the passband
> spectrum of APF filtering.
>
> http://n1eu.com/k3/k3_apf.htm
> (or simply go to n1eu.com and look under "K3")
>
> 73, Barry N1
Hi
I cannot use my APF due to a loud howl, it's sounds like a gale blowing through
a pipe.
It's impossible to copy weak signals in the Ukrainian dx contest.
I've make a short video of it on my iPhone if anyone wants to hear it.
I'm just wondering if I have anything else set which is interacting wi
If anyone is interested, I posted a recording of APF in action (on/off)
listening to RA0FF this morning on 160M. I also plotted the passband
spectrum of APF filtering.
http://n1eu.com/k3/k3_apf.htm
(or simply go to n1eu.com and look under "K3")
73, Barry N1EU
> From: li...@subich.com
> To: notforc...@hotmail.com
> CC: pkir...@fuse.net; elecraft@mailman.qth.net; n...@elecraft.com
> Subject: Re: [Elecraft] APF and Normalized Filter Passband Display
>
>
> > After all, this is supposed to be a representation icon of the APF,
&
> Width and the APF width separately and properly.. they shouldn't just be
> combined together, that's a misrepresentation of the feature. And I know how
> Wayne is set on having correlation to all his designs and their respective
> displays and or keys they're placed on.
04 -0400
> From: li...@subich.com
> To: notforc...@hotmail.com
> CC: pkir...@fuse.net; elecraft@mailman.qth.net; n...@elecraft.com
> Subject: Re: [Elecraft] APF and Normalized Filter Passband Display
>
>
> The "wings" are already set at maximum width and the "cente
me that the
> OUTTER "WINGS" move to show the Width of the filter being used around the
> APF. That's all.
>
>
>
>
>> Date: Fri, 5 Nov 2010 12:45:30 -0400
>> From: li...@subich.com
>> To: pkir...@fuse.net
>> CC: elecraft@mailman.qth.net
>>
f the filter being used around the APF.
That's all.
> Date: Fri, 5 Nov 2010 12:45:30 -0400
> From: li...@subich.com
> To: pkir...@fuse.net
> CC: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] APF and Normalized Filter Passband Display
>
>
> > Recall
> Recalling NORM2 changes the APF shift back to its normalized setting.
> But the "wings" don't change when that happens.
The "Wings" don't change as long as APF is on. If you saved NORM2 with
APF on, recalling NORM2 turns APF on (and displays the wings).
73,
... Joe, W4TV
On 11/5/2010
Recalling NORM2 changes the APF shift back to its normalized setting.
But the "wings" don't change when that happens.
73, Paul W8TM
At 11:57 AM 11/5/10 -0400, Joe Subich, W4TV wrote:
>
>When APF is engaged, the shift knob no longer shifts the IF/DSP -
>it moves (shifts) the audio peak within the
When APF is engaged, the shift knob no longer shifts the IF/DSP -
it moves (shifts) the audio peak within the IF passband. Thus,
the IF/DSP response display does not change. Note - adjusting
the WIDTH control will change the width of the "center" portion
of the display as the IF/DSP width change
I SAVed CW NORM2 to include APF. Now rotating the SHIFT control doesn't
remove the "wings" from the filter passband graphic, as it would without APF.
Thus it isn't possible to tell from the display if the filter is still
normalized to NORM2.
Is this intended?
73, Paul W8TM
I'm playing with the new APF, and trying to get a REALLY weak QSO to pop. I
have the
volume cranked up pretty good, and a REALLY strong station throws in their
call. I
thought my speakers had blown. Glad I wasn't wearing cans.
My CONFIG:AF is 18, AGC = F.
Was I doing something wrong? Anybody
Regarding my previous message on APF macros--
I had to change the name of APF SHFT to APF SHF (discovered the
character limit when saving the macros to M4T and M4H on my K3.)
Since the APF function seems to save the last shift used, it seems
less important to include an APF shift in the macro.
7
I received some helpful suggestions from "The Smiths" regarding APF,
specifically using RIT to shift the received signal down 20 Hz or so and
using
APF Shift to peak the signal. The purpose is to make the tone of the
received signal 20 Hz lower than the faint ringing noise induced by APF.
This s
on 80 cw last evening, works well but the
>> distortion certainly hurts the copy.
>>
>> Jim K4JAF
>>
>>
>> - Original Message -
>> From: "Wes Stewart" n...@yahoo.com>
>> To: "Elecraft Reflector" elecraft@mailman.qth
better." I love the new APF! It
reminds me of how the "peak" function in the old Heathkit QF-1 Q-Multiplier
used to work and sound, except it's even better.
Bill W5WVO
-Original Message-
From: drewko
Sent: Thursday, November 04, 2010 16:10
To: Elecraft@mailman.q
For this old dog it is great !
I very much like the peak, works very well at pulling the weak signal up
for much better copy. Congratulations Elecraft this is a super tool for CW !
Now the bad news.
My Yaesu FT1000 was switched in when needed on CW receive just for the APF to
pull
a bor
There was a suggestion posted within the last few days to reduce the
ring by adjusting the APF SHIFT along with RIT by 20 Hz. This might
make a nice one--push macro but I don't think there is a APF SHIFT
command available yet (The IF SHIFT command does not work in APF.)
Also, for for those who wa
quot;Elecraft Reflector" elecraft@mailman.qth.net>; "JAMES ROGERS"
>w4...@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 rin
"Elecraft Reflector" ; "JAMES ROGERS"
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
us
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,
espe
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 cu
I hardly ever post anything, anywhere. I'm just too busy at work. I do read
the emails everyday from Nabble.
I'm really not a good CW operator. But the newest APF is truly amazing. I
successfully loaded the update. Clicked on a CW station using HRD's cluster
listing. Turned on the APF and
or at least an audio-only comparison...
Anyone? Anyone?
Bueller?
John Harper
http://www.ae5x.com/blog
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto
mini-module kit.
So I dug out the AF-1 and hooked it to the K3 phones output, tuned in some
stations and switched between the outboard AF1 and the Elecraft APF.
I find very little difference in the sound. The AF1 provides the peaking
gain with a shape peak and wide skirts and in BP2 po
Hi,
As mentioned elsewhere very narrow bandwidth using the filedtest APF firmware
causes some ringing (expected) which really causing problems when receiveing
VERY, VERY weak CW signals (where it's most needed) at or below the noise
level. If the signals are just a tiny bit stronger the APF wo
If having a "mild Q" available will allow it to be used full-time without
ringing, and reduce background noise, I would love to have that feature!
73,
Dick- K9OM
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 li
Too bad I didn't get it installed in time for the QRP Zombie Shuffle --
lots of signals needing help there.
It's not easy to find just the right signal that might benefit when you
want to test one, but I've found several in the past couple days. I
think the APF is going to be a useful addition
elecraft@mailman.qth.net
> Subject: [Elecraft] APF preview: very nice
>
> I was able to try the new APF firmware last night. It is very dramatic,
> and I find it helpful in extremely weak signal situations. It's great
> to have this
> available at the push of a button. I would no
I was able to try the new APF firmware last night. It is very dramatic,
and I find it helpful in extremely weak signal situations. It's great
to have this
available at the push of a button. I would not use it every situation,
nor would
I tune around the band with it because the ringing in the
I had an opportunity to test the APF last night during the 1296MHz ARRL EME
contest.
This application is interesting because of the very uniform background noise
and the lack of QSB- at least as we know it on the HF bands. There is a very
short term QSB that is a result of the apparent rocking m
Thanks for you ob's Richard.
Well perhaps the powers to be can secretly have a look-see at the variable Q
and IF they collectively think it's well worth the mod then, 'make it so'!!!
Ken..G0ORH K2, K3, P3.
CW4EVER
Sent from my iPhone
On 30 Oct 2010, at 18:18, Richard Squire - HB9ANM w
After extensive tests with the new APF feature, I can say the results in
digging out weak CW signals are impressive. I was so enthusiastic that I
forgot about the SSB contest this weekend and concentrated on CW! The fact
that it is independent for the main and sub receivers is a very useful
featur
>> 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: F
Please lets not dumb it down for contesting. Let's optimize it. !
You can choose to use the extra peaking it provides with a little more knob
turning
or choose to not use it. Ask how many 160 meter contesters will use it !!!
If you are a CW contester I guarantee you will choose to use !!
Bob
Thank you very much for that small favor :-)
Grant/NQ5T
On Oct 29, 2010, at 2:12 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> Folks - It is inappropriate to reply pro or con on this thread. That is
> outside of the list guidelines and only serves to inflame the issue and
> clog the list with c
Variable Q might be nice, it seems a pretty good compromise as is though.
the issue I would have with putting the Q on the width control is that
this then prevents the user altering the IF filter bandwidth when the
APF is selected
Currently I am finding that I am still playing with the IF width
101 - 200 of 337 matches
Mail list logo
