> The APF function on my KX3 makes the signal jump out of the noise
>
> Hope the feature remains in the K4 line
It does. There are now two bandwidth settings, too.
Wayne
>
> Regards, Jan K1ND ~ stay-safe ~
>
>
> --
> This email has been checked for viruses by AVG.
> https://www.avg.com
>
January is SKCC K3Y month ~ come join us for some straight key (or bug)
CW fun~
The APF function on my KX3 makes the signal jump out of the noise
Hope the feature remains in the K4 line
Regards, Jan K1ND ~ stay-safe ~
--
This email has been checked for viruses by AVG.
https://www.avg.com
_
The K3 APF has a very sharp peak (about 30 Hz @ 3 dB) but broader
shoulders (about 300 Hz wide). It is not in the AGC loop, so any signals
inside the bandwidth set by the bandwidth control may activate the AGC.
Therefore, if you have nearby strong signals, you should reduce the
bandwidth to ke
to figure this out. Have fun!
73,
Brian, K0DTJ
-Original Message-
From: "kevinr"
Sent: Monday, August 24, 2020 19:33
To: "Elecraft Reflector"
Subject: [Elecraft] APF Primer?
1) What are the best band conditions to try APF? Does it work under
medium QSB against
Kevin:
1) For a K3, APF seems to be very dependent on current AGC action. If
there are very strong signals close in and the AGC is doing its thing,
APF doesn't seem to work. You can adjust the AGC parameters, however my
experience is that I use APF infrequently enough that it's better to
ad
I have used APF a number of times. Sometimes it worked, but often the
ringing makes it hard to hear anything intelligible.
I have a two families of questions to hopefully remedy my problem.
1) What are the best band conditions to try APF? Does it work under
medium QSB against medium to high
Hi!
I have tried to solve the problem when using TrueTTY and K3s APF.
Everything works fine without APF (using rev data) but if I turn APF on
I lose all the tracks on the waterfall. I have tried all mark and shift
combination. APF works ok with MMTTY but it is too clumsy program for me
so tha
Thanks for all the discussion on the APF. I've got a technique now and I think
I can refine it into something useful.
vy 73,Dave N4KD
On Saturday, February 6, 2016 8:02 AM, Chuck Guenther
wrote:
I've been using APF in my K3 since it was in Beta testing. I love it!
I've found it nece
I have heard people using voice synthesizers on voice modes. I
believe they have had issues which keep them for speaking and
this is their way of being able to get on the air. It is
certainly my way of doing 25+ wpm DX contacts, but I keep trying
to learn. I also QSOed with a guy on PSK31 who c
Stand by, that will come, Hi!)
>
> 73, Ron AC7AC
>
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
> F5vjc
> Sent: Sunday, February 7, 2016 4:56 AM
> To: Bill W4ZV
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] APF (audi
will come, Hi!)
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of F5vjc
Sent: Sunday, February 7, 2016 4:56 AM
To: Bill W4ZV
Cc: Elecraft Reflector
Subject: Re: [Elecraft] APF (audio peaking filter) on the K3/K3S/KX3
Well actually I pr
Well actually I prefer copying CW with a certain amount of noise present.
Pure tone, no noise CW, as from a practice oscillator or an S9++ signal
quickly becomes boring and I loose concentration(or something).
It's perhaps why I prefer to dig out weak signals (ESP) from the noise on
the band.
Howe
I've been using APF in my K3 since it was in Beta testing. I love it!
I've found it necessary to use both the shift and Fine tuning-- these
are not optional for effective use of APF. I've been using macros to
engage and dis-engage the APF.
One reason I keep combing through the Elecraft Refl
N1EU wrote
> I suspect that when the K3 APF was first engineered, the Yaesu FT-1000D
> APF
> (original hi-Q version) was used as the model because many prominent
> dx'ers/topbanders always raved about it.
I lifted the "original" FT-1000D APF from the schematic in 2009 and Al W6LX
did a circuit sim
I followed my interpretation of Wayne's instructions when trying
to copy VP8SGI on 80M. I have an inverted V antenna with the
peak at about 12 meters (44').
When I started, I could barely hear him. When I got the APF
tuned in, I could hear him clearly, and actually managed to work
him with 10
Also, you can move the "peak" left/right by rotating the SHIFT knob. You will
see APF setting appear in the VFO B area and the ref point is denoted by an "*"
next to 45.
Sent from my iPhone
...nr4c. bill
> On Feb 5, 2016, at 10:27 AM, David Kuechenmeister wrote:
>
> Thanks. I'll try again a
Stephen is correct.
Several of us lobbied for an APF feature shortly after the K3 debuted in
2007, drawing on our experiences with the FT-1000D. There /were/ two
firmware versions that Wayne developed, and the consensus among some of
us was that the first one was better than the second. As I
I suspect that when the K3 APF was first engineered, the Yaesu FT-1000D APF
(original hi-Q version) was used as the model because many prominent
dx'ers/topbanders always raved about it.
73, Barry N1EU
On Fri, Feb 5, 2016 at 12:37 PM, Scott via Elecraft <
elecraft@mailman.qth.net> wrote:
>
> In t
In the last month of listening to really weak signals here in 9 land I've
found it helpful but not radical.
Just for fun I tried tuning some of the same VP8SGI signals on a Drake
2B/2BQ and found adding the 2BQ in the mix more user friendly and making a
bigger difference, but hey, the 2B
Lightning has dramatic effect on the AGC system of many to most
receivers. Rob Sherwood has had a lot to say about this. Elecraft has
taken steps to minimize the effect.
Yes different types of noise clearly have different characteristics and
thus the reason for suggesting reducing the RF Ga
The technique I'm using with the APF also involves NR like so:
On an uncrowded band, set the DSP BW to 700 to 1000 Hz. If you have a roofing
filter in that range stay within it.
Turn on NR set to mF5-3 or there about. The wide BW helps the NR work well. The
"mix" mode lets a little unprocessed
one must also discover the
artful use of the RF Gain control as well
Adjustment of the RF gain control is not mentioned in Wayne's note on
using APF.
When I tried it here, the RF gain might have made some small
difference but it still did not allow un-copyable signals to be
copied. When t
While I find the APF works really nice, one must also discover the
artful use of the RF Gain control as well. Most hams seem to use
excessive RF Gain which will force noise through the filter and all of
those undesirable artifacts will be heard. If in doubt, reduce the RF Gain.
Using this t
I went from a TenTec Orion to my K3 ( whose box I opened almost the very day
the K3S was announced which is total BS) and I really mis the SAF feature in
the Orion. The APF in my K3 doesn't touch it.
W5SUM
Sent from Ronnie's IPhone
> On Feb 5, 2016, at 09:56, dave wrote:
>
>
> I'd agree. My
I've seen it written that it helps to offset the IF slightly, although to
be honest I have never myself got the APF to work to my satisfaction.
Oddly, and I communicated with Wayne about this at the time, the first beta
(I think) implementation of it was stunning, but a later release lost it
for me
I'd agree. My experience with APF is that it will indeed pop a signal
that is already copyable, if a bit weak, out of the noise. Makes for
easier copy. However the ringing is so bad on a really weak signal
that it is of no help. I guess it depends on what you view as 'weak'
and your noise lev
Thanks. I'll try again and be very careful this time.
vy 73,Dave N4KD
On Friday, February 5, 2016 10:08 AM, Barry N1EU
wrote:
The receiver has to be tuned precisely to the signal in question for APF to
work.
73, Barry N1EU
On Fri, Feb 5, 2016 at 9:53 AM, David Kuechenmeister
wrote:
The receiver has to be tuned precisely to the signal in question for APF to
work.
73, Barry N1EU
On Fri, Feb 5, 2016 at 9:53 AM, David Kuechenmeister
wrote:
> I tried this the other day with no success. That is, the weak signal that
> was barely detectable, became so buried in ringing that I co
I tried this the other day with no success. That is, the weak signal that was
barely detectable, became so buried in ringing that I couldn't detect it at
all. I think I followed the procedure outlined in Wayne's email below...
Noise was around S5 on 40m and the K3 was configured with APF active.
Dang.tnx for the reminder about APF, Wayne --- still getting
"comfortable" with my KX3 so forgot about its value while engaged in
self-flagellation i.e., operating in the CQ 160 contest last weekend.
72 de Jim Rodenkirch K9JWV
--
View this message in context:
http://elecraft.365791.n
As a new K3S owner {since last August}, I agree. The APF seems to lift
signals out of the noise when otherwise, one would not know they are
present. I've used it successfully many times on weak signal QSO's.
Thanks for designing a great radio for the ham market.
73
Bob, K4TAX
K3S, s/n 10163
Hi all,
This morning I was hearing lots of very weak signals in the 40-meter CW band,
right at today's noise floor of about S-5. (Among others, I copied BG4GOV in
Shanghai.)
Many of the signals were not copyable until I turned on APF (audio peaking
filter). This filter's center peak is very na
Whatever happened to the plan to provide adjustable or stepped values of
selectivity for the APF function? I rigged up a kluge consisting of an old
Autek QF-1A but would much rather have it's function built-in.
73 Roger
__
Elecraft mail
*/I agree I always liked to adjust my ft1000d APF a bit off center as well.
Regards
Art
ka9zap
/*
On 2/14/2015 9:42 PM, Guy Olinger K2AV wrote:
One thing I like about it is that a "hold" on the SUB button now puts
you back in diversity immediately. Quick way to get it back when a
split spot ha
Thanks, Don. My choice of 700-1000 Hz is more for the NR than for the APF. The
idea is to get the noise going into the NR routine as uncorrelated as
practical. The knee of that curve seems to be around 700 Hz. Any lower and the
NR doesn't work as well. It's a bit subjective. Also using the "mi
Brian,
Yes, using APF with a wider bandwidth helps, but a width more narrow
than 700 Hz should be usable - 400 Hz and more narrow may be "iffy".
FINE tuning with APF turned on is a necessity.
73,
Don W3FPR
On 3/16/2014 8:44 PM, Brian Hunt wrote:
My "formula" for tuning very weak signals - a
My "formula" for tuning very weak signals - almost can't see them on the P3 -
is as follows:
- Set the WIDTH to 700 Hz to 1 KHz QRM permitting.
- Turn on NR and set to 5m3 or there about.
- Turn on APF and tune for best audio. Setting the rate to FINE sometimes
helps.
This almost completel
Todd,
I am not going to "weigh in" on anything you said. In the case of APF,
the instructions by your very Zen instructor may the best appropriate
answer.
Before you need to use it, give it a try on some weak signals and play
with the width and shift controls until you get a feel for it. It
I have received 2 inquiries about how to use the APF. Well, I’ll put it to you
this way. I used to be a photographer and used a 5X7 view camera. The image on
the viewing glass was upside down, both the front (lens board) and rear (view
glass) board swiveled from side to side and up and down. It
Dear List Readers
Eureka moment! I finally figured out how to use the APF effectively, and it
really does work on digging out weak sigs. XZ1Z was virtually indecipherable
until I started messing with the APF. All of a sudden, I heard him Q5 (enough)
to hear him come back to me distinctly. Thank
Hi all, and Sam;
>
>
>Message: 7
>Date:
Sat, 07 Dec 2013 19:38:20 -0600
>From: Sam Morgan
>To: "elecraft@mailman.qth.net"
>Subject: Re: [Elecraft] APF
>Message-ID: <52a3cd8c.2090...@gmail.com>
>Content-Type: te
I agree with Bill. There's no need to fiddle with the RIT control. I think
Dusty's original suggestion implies that he found the APF to be more
effective at a slightly lower frequency (20Hz lower) than his nominal CW
pitch setting. This may be true but it can be more easily accomplished by
tuning t
I too often use APF on both the K3 and KX3. I prefer tuning APF with 1
Hz steps.
The KX3 enables 1 HZ steps when APF is enabled. I miss that feature with
the K3.
A new feature request; when in SPLIT and VFO A at 1 Hz, leave VFO B at
10 Hz.
John KN5L
On 12/08/2013 04:48 AM, Bill W4ZV wrote:
> I
IMHO K3WC's APF suggestion is WAY TOO COMPLICATED. I use APF virtually all
the time and never use RIT, SHIFT, etc. Just HOLD DUAL PB to actuate APF
and use the VFO to zero beat. COARSE (10 Hz) VFO steps is usually close
enough but you can switch to FINE (1 Hz) if necessary for ultra weak
signals
1st of all let me be clear, I was merely quoting from my notes that I
had copied from a post (or web site?) that Dusty K3WC wrote
that said
yes it was the Shift knob Dusty was speaking of
calling it the Shift Fc (frequency) knob
when I turn mine it says (in the VFO B window)
APF *0.48 (my pi
Sam;
Your explanation is really good Sam, but it seems that something doesn't
follow for me.
cut...
>Turn on the RIT control (tap the RIT button). Next, lower the RIT
>frequency -20 Hz. (You must have CONFIG:PB CTRL in the config menu set
>to .01 to move in 10 Hz s
The subject line should read APF of course, sorry!
Sam, thank you for the tips on APF. One remark though:
"Switching between the two filters is as easy as HOLDING the SHIFT knob in."
I suppose you mean the WIDTH knob...
73
Richard - HB9ANM
__
one more fyi on the [XFIL/DUALPB] button
when in RTTY, both AFSK A and FSK D, it's a Dual Passband Filter
when in CW mode it acts like the single peak APF
there's an image of the APF in use on N1EU site:
http://n1eu.com/K3/K3_apf.htm
On 11/30/2013 11:56 AM, Sam Morgan wrote:
I'll copy and past
I'll copy and paste from my notes, hope it helps clear it up for you.
sm
APF on the K3
The APF is an easy tool to use. However, one of the main concerns people
are talking about now is the fact that the filter seems to be a bit
tight, and tends to ring. This, of course,
Can someone explain how to engage and use the Audio Peak Filter on the K3?
thanks in advance
todd
WB2ZAB
__
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto
Hello all and Happy Thanksgiving:
I am trying to create a macro to do the following:
1. Set radio to Fine tuning mode (1 hz increments)
2. Turn on APF
Then with another push of a button
1. Turn off APF
2. Return radio to "regular tuning speed" (in my case 10 hz increments)
I realize this would
Hello Mike,
The APF, because of the high "Q" will naturally produce ringing with a
strong signal. Just back down the RF Gain control until you can clearly
hear the keying elements. However, I'd suggest that if the signal is
that strong to begin with, you probably don't need to use the APF
func
VE3WDM wrote:
>
> When using the APF function on my K3 I am getting a real tinny sound to
> the point were it is difficult to understand the code. I was wondering if
> settings were ok.
> Here is what I do.
> 1. Zero beat the CW signal with the spot feature and tuning is set to
> fine.
> 2. The
When using the APF function on my K3 I am getting a real tinny sound to the
point were it is difficult to understand the code. I was wondering if settings
were ok.
Here is what I do.
1. Zero beat the CW signal with the spot feature and tuning is set to fine.
2. The filter is set at either 400hz
Well even really old dogs can learn new stuff. Tuning around on 30m,
with AFP enabled, something I have never done before -- I just forgot to
turn it off, I found signals ... and worked one I did not hear with AFP
turned off.
I'm becoming convinced that my K3 [and K2 for that matter], are radi
PM
To: Ron D'Eau Claire
Cc:
Subject: Re: [Elecraft] APF Macro
There are some samples in K3 Utility help, look for command macros in the
index. I'm open to adding and annotating more samples. This isn't to
discourage use of other repositories, however.
73 de Dick, K6KR
On Feb 12,
I reported a macro for turning on APF, RIT, and FINE and shifting RIT
down 20 Hz in a
reflector message dated November 4, 2010. I also included a macro for
clearing all these
functions, since I could not seem to come up with a toggleable version.
Since I wrote that, I revised my macro's to the f
y what you want, it's often a lot easier to make
> a small change than to start from scratch.
>
> Ron AC7AC
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of n...@aol.com
> Sent: Saturday, F
t there isn't a
command to simply say, "Turn on (or off) the APF". So it seems to me that
trying to assign a function to macro key assignment just moves the toggle
requirement from one key to another. Hardly seems like progress.
Wes N7WS
--- On Sat, 2/12/11, n...@aol.com w
The help file of the K3 Utility program has lots of useful macros as well as
the information on how to send them to the radio and assign them to radio
buttons using the CONFIG menu.
For anyone using DXLab's Commander rig control program, that program offers
an alternative to macros in the K3. Comm
11 4:14 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] APF Macro
>
> Age notwithstanding, many of us find messing with macros or other
> 'programming' activities right up there in desirability with
> hauling out the
> trash.
>
> Perhaps it would
s often a lot easier to make
a small change than to start from scratch.
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of n...@aol.com
Sent: Saturday, February 12, 2011 2:56 PM
To: elecraft@mailman.qth.net
Subject:
It is tough to get old and find most of your electronics know-how is out
of date- so much so that creating a macro from scratch seems beyond my ken.
APF is a very useful function, and I use it along with RIT as the fine
tuning mechanism. How would one generate and execute as either a macro
Bill, the K3s dBv and AF Mv meters are true RMS. We added that feature for
automated MDS testing in K3 production.
73,
Eric
www.elecraft.com
_..._
On Jan 27, 2011, at 11:17 AM, Bill W4ZV wrote:
>
>
> Arie Kleingeld PA3A-2 wrote:
>>
>> I have no lab equipment but I have a K3 with dBV meas
Thank goodness (and Elecraft) most of the DXpeditions these days are packing
K3s. That means I stand a chance that they'll hear little pistols like me!
73,
Ken Alexander
VE3HLS
--- On Fri, 1/28/11, Elliott Lawrence wrote:
> Just worked VP8ORK on 12cw. No copy without the APF. Workable wit
Elliott,
Congratulations on working VP8ORK !
I hope to work them also, armed with my
K3 APF battle gear.
73,
Bob
K6UJ
On Jan 28, 2011, at 12:46 PM, Elliott Lawrence wrote:
> Just worked VP8ORK on 12cw. No copy without the APF. Workable with it
> Other spots saying only esp. Guess they w
Just worked VP8ORK on 12cw. No copy without the APF. Workable with it
Other spots saying only esp. Guess they weren't using a K3!!!
Thanks again to Wayne and Eric for an outstanding radio.
73
Elliott WA6TLA
__
Elecraft mailing l
I am not smart enough to comment regarding the real stuff going on
behind the sceines in the code.
However, since the new update the NR and NB pretty much take care of my
Plasma TV noise.
So there is something that changed in the combination and I say thanks
for this improvement.
Don
KD8NNU
Lyle (KK7P), our DSP engineer--a very meticulous guy--just did a very
careful re-test of the two versions of code referred to in this
thread. He found no difference between 4.17 and 4.25.
I see that Arie (PA3A) also confirmed no difference when he repeated
his own test. (Thanks for doing thi
PA3A wrote:
> Measured the two FW's 4.17 and 4.25 with APF on S+N/N ratio at MDS
again, and again.
Question was: if the filter plots are exactly the same, where does the
measured (marginal) difference of 2 dB come from?
> Found no difference this time. Seems that the XG2 drifted a bit in
yest
All,
Measured the two FW's 4.17 and 4.25 with APF on S+N/N ratio at MDS
again, and again.
Question was: if the filter plots are exactly the same, where does the
measured (marginal) difference of 2 dB come from?
Found no difference this time. Seems that the XG2 drifted a bit in
yesterdays measu
Bill,
I am not suggesting Elecraft do anything other than the explanations
that have already transpired.
Yet even with such dialog and tests that say "Q. E. D.", there will be
many who remain unconvinced, and will want to stick with the old version
"because it is better". They will not be co
Don Wilhelm-4 wrote:
>
> I had a sage manager many years ago who often stated "Perception is 99%
> of reality". Being of a scientific mind, I had my doubts at the time
> thinking "people will be convinced by the facts of science".
> In later years, I have mellowed and now agree with that man
But Bill,
I had a sage manager many years ago who often stated "Perception is 99%
of reality". Being of a scientific mind, I had my doubts at the time
thinking "people will be convinced by the facts of science".
In later years, I have mellowed and now agree with that manager.
Perception IS
Barry N1EU wrote:
>
> 4.16 APF has the same response curve as all the other versions.
>
Q.E.D. If it has an identical response curve it has identical S/N
performance. Anything else is either differences in noise conditions or
human imagination.
73, Bill
--
View this message in context:
hidden
>> email]<http://user/SendEmail.jtp?type=node&node=5967599&i=0>>
>>
>> To: <[hidden email]<http://user/SendEmail.jtp?type=node&node=5967599&i=1>>
>>
>> Sent: Thursday, January 27, 2011 6:44 AM
>> Subject: [Elecraft] APF
Within the band-limited audio passband of the K3, the RMS metering is
very accurate. The algorithm is:
1) measure and square each reading
2) sum with the previous readings (accumulate)
3) do this for 500 ms or 1 sec
4) divide the sum by the number of samples taken
5) compute the square root
6) c
Hi,
Doing true RMS over the selected passband is very easy to do with DSP and I
have no reason to doubt that the K3 dBV meter is a very close approximation
to true RMS even on signals that are far from sinusoidal (such as noise).
Analog is a different story and I agree that there are many false c
Bill,
Thanks for your added comments.
As I said, I do not have the lab equipment to do this. But there are
people in this group that have and can measure far better than I.
The APF (for me) is not about selectivity. I use it when digging into
the noise and get a better copy of weak signals.
Tha
Scott Ellington wrote:
>
> Page 36 of the K3 owner's manual:
>
> "AFV shows the true RMS value of receiver AF output (mVp-p), unaffected by
> AF GAIN control. "
>
While that may be true for sinusoidal signals I doubt it holds for noise
measurements. Accurate noise measurements require a "tru
- Original Message -
> From: "Arie Kleingeld PA3A" <[hidden
> email]<http://user/SendEmail.jtp?type=node&node=5967599&i=0>>
>
> To: <[hidden email] <http://user/SendEmail.jtp?type=node&node=5967599&i=1>>
>
> Sent: Thursday, J
ngeld PA3A"
To:
Sent: Thursday, January 27, 2011 6:44 AM
Subject: [Elecraft] APF measurements: FW 4.17 better results by 2 dB
> Hello all,
>
> Did some measurements on the different frimware versions. This time not
> a BW-plot but I measured S+N/N ratio's.
>
>
> I h
Page 36 of the K3 owner's manual:
"AFV shows the true RMS value of receiver AF output (mVp-p), unaffected by AF
GAIN control. "
73,
Scott K9MA
On Jan 27, 2011, at 1:17 PM, Bill W4ZV wrote:
> I'm sure you know that
> noise can only be measured correctly with a True RMS responding
> meter.
Arie Kleingeld PA3A-2 wrote:
>
> I have no lab equipment but I have a K3 with dBV measurements, XG2 and
> the stepped attenuator from elecraft.
>
Arie I believe you may have some measurement error. I'm sure you know that
noise can only be measured correctly with a True RMS responding
meter..
All,
where I mentioned Dual PB, I mean ofcourse the APF, because that the
discussion here.
Sorry If that is not clear.
73
Arie PA3A
Op 27-1-2011 12:44, Arie Kleingeld PA3A schreef:
> Hello all,
>
> Did some measurements on the different frimware versions. This time not
> a BW-plot but I measure
Good advice from N1EU and K2AV here, folks!
Also, see Wayne's posting: "Tips for using APF."
I'm a junkie for trying out new firmware, and I can attest that the APF
is as good
as it ever was-- in fact you need the latest version of it to be sure
you have the
5 Hz resolution in the APF shift cont
Hello all,
Did some measurements on the different frimware versions. This time not
a BW-plot but I measured S+N/N ratio's.
I have no lab equipment but I have a K3 with dBV measurements, XG2 and
the stepped attenuator from elecraft.
I measured the difference of the K3 dBV-reading in signal off
Hi Barry,
I'm curious too. This has come up before. I'd be interested in what you
see.
73,
Bob
K6UJ
On Jan 26, 2011, at 3:12 PM, Barry N1EU wrote:
>
> Okay, what version of firmware has the "original" APF that worked better for
> you guys? I'll try and run a spectral comparison of the two
t; factors at play. I dont really have the answer. I am keeping the original
> firmware just for contests.
>
> 73
> John
>
>
>
> --- On Wed, 1/26/11, David Lear wrote:
>
>> From: David Lear
>> Subject: [Elecraft] APF
>> To: Elecraft@mailma
May I suggest that one of the necessities of using APF is to throttle back
the RF gain so that the AGC is not pushing up the noise to the level of
forcing what sounds like ringing. When I'm hearing what sounds like
ringing, moving back the RF gain (or removing PRE, or using ATT) will
usually clear
Forget it - full stop!
I just ran a spectral analysis of the current firmware versus the very first
APF implementation (mcu 4.17 dsp 2.65) from 11/3/10 AND THE PLOTS ARE
ABSOLUTELY CONGRUOUS! The APF implementation hasn't changed a bit (or a
byte).
Have a look: http://n1eu.com/k3apf.gif
magen
ocks can only be blown off once?
Steve
N4LQ
- Original Message -
From: "Barry N1EU"
To:
Sent: Wednesday, January 26, 2011 6:12 PM
Subject: Re: [Elecraft] APF
>
> Okay, what version of firmware has the "original" APF that worked better
> for
> you guys? I
inal firmware just for contests.
>
> 73
> John
>
>
>
> --- On Wed, 1/26/11, David Lear wrote:
>
>> From: David Lear
>> Subject: [Elecraft] APF
>> To: Elecraft@mailman.qth.net
>> Date: Wednesday, January 26, 2011, 11:27 AM
>> Did anything change
Okay, what version of firmware has the "original" APF that worked better for
you guys? I'll try and run a spectral comparison of the two and post the
results. I'm skeptical that there's a difference but I'm willing to give it
a go.
Barry N1EU
juergen piezo wrote:
>
> I like you cant get the
>
>
>
> --- On Wed, 1/26/11, David Lear wrote:
>
>> From: David Lear
>> Subject: [Elecraft] APF
>> To: Elecraft@mailman.qth.net
>> Date: Wednesday, January 26, 2011, 11:27 AM
>> Did anything change with APF in the
>> latest releas
other
factors at play. I dont really have the answer. I am keeping the original
firmware just for contests.
73
John
--- On Wed, 1/26/11, David Lear wrote:
> From: David Lear
> Subject: [Elecraft] APF
> To: Elecraft@mailman.qth.net
> Date: Wednesday, January 26, 2011, 11
Did anything change with APF in the latest release ? Seemed to perform
better before rev 2.45. Maybe I 'm just loosing my touch.
73 Dave Lear NE5DL
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Bob,
I would recommend you review the forum discussions on this subject last year
from September thru
November. This was discussed extensively. The K3 APF has been optimized. To
reduce the sharp high Q audio sound would entail reducing the Q and flattening
out the response. In essence
reducin
I find the APF to be very effective when preceded by a relatively wider
filter
as suggested by K9ZTV, and offsetting the receive a little as mentioned
by W6OPO.
I generally use the 250 Hz crystal filter, followed by a DSP bandwidth
between
200-300 Hz. I use a macro to turn on APF and FINE and
I've found that using the APF with the 400 filter (or wider) dialed-in
provides less ringing than using APF with the 50 filter (DSP) dialed-in.
Either way, it's effectiveness is excellent, and that from a twelve-year
FT-1000D owner.
73,
Kent K9ZTV
Jefferson City, MO
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