Quote para 2, both points: Reciprocity still applies with respect to
gain and off axis effects. If the receive antenna is down by 3dB, it
will be down by 3dB EIRP when transmitting; if down by 10dB, the EIRP
will be down 10dB.
Quote para 3: Local noise does make a real difference and will
that it acts NOTHING like the APF with a wider
Q in suppressing noise and improving gain as we're seeing on this current APF.
Again, this is NOT a Yaesu rig...
Date: Sun, 31 Oct 2010 10:27:33 -0400
From: li...@subich.com
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 APF
Subject: Re: [Elecraft] K3 APF Adjustable Q
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
@mailman.qth.net
Subject: Re: [Elecraft] K3 APF Adjustable Q
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
I agree with the comments about the use of the DPB filter who act as a APF
with wider Q.
May be the suggestion is to give more flexibility to the DBP filter in order
to let the K3 user choosing what would be the best in its own suppressing
noise environment.
73's
Philippe A65BI
The Smiths
in suppressing noise and improving gain as we're
seeing on this current APF. Again, this is NOT a Yaesu rig...
Date: Sun, 31 Oct 2010 10:27:33 -0400
From: li...@subich.com
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 APF Adjustable Q
however the fixed Q has a bit of ring and at times I
. Again, this is NOT a Yaesu rig...
Date: Sun, 31 Oct 2010 10:27:33 -0400
From: li...@subich.com
To: elecraft@mailman.qth.net
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
As per Wayne's last email, we've settled on the initial features of the
APF and will be putting up a public Beta of the code this week. Stay tuned!
Let's table the discussion of Adjustable Q, and other APF feature
pro/cons for now in the interest of reducing list email overload for
others :-)
I can't resist this. This weekend I heard a big pileup on 9X0SP but I could
barely hear
the 9X station. With the APF he was solid copy. I worked him on the second call
with my
100w K3, thanks to these two factors:
1) The APF which let me copy him.
2) The P3, which let me see the signal of
I can't resist this. This weekend I heard a big pileup on 9X0SP but
I could barely hear the 9X station. With the APF he was solid copy.
I listened to XV2RZ for quite a while last night on 20 meters. He was
only an occasional ping in the noise without the APF but perfectly
Q5 for well over
This is a real problem. Now I can hear more stations that can't hear me with
my PW signal :.(
Barry W2UP
Joe Subich, W4TV-4 wrote:
I listened to XV2RZ for quite a while last night on 20 meters. He was
only an occasional ping in the noise without the APF but perfectly
Q5 for well over
Barry said
This is a real problem. Now I can hear more stations that can't hear me
with
my PW signal :.(
Barry W2UP
And soon our favorite Toy Store will have a fix for that problem with the
KPA-500 :-)
Yeay!!!
Gary
On Mon, Nov 1, 2010 at 8:06 PM, Barry w...@comcast.net wrote:
This is a
On Nov 1, 2010, at 12:53 AM, David Woolley (E.L) wrote:
Quote para 2, both points: Reciprocity still applies with respect to gain
and off axis effects.
My mistake. David is correct on this point.
Given a constant signal power across the receiving antenna terminals, the SNR
would be
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
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
To: elecraft@mailman.qth.net
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
We already have the peak sweep with the SHIFT control. It would be great to
have variable Q with the WIDTH control. Varying the amount of Q is desirable
so the peak can be adjusted to reduce any ringing that might be present. Roy
Morris W4WFB
: 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
There are also other considerations. In QRQ mode, RIT is N/A. So
other than tuning VFO A to follow the peak, use SHIFT to do it. Also,
SHIFT uses a 10 Hz resolution independent from the VFO tuning rate.
This doesn't leave many of the overloaded controls on the UI for a
PEAK control.
Having a
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
, October 31, 2010 12:25 PM
Subject: Re: [Elecraft] K3 APF Adjustable Q
I agree that we should not give up the tunable APF. For one thing, RIT is
not available if
QRQ CW is on. I like the option to set the DSP bandwidth to say, 1 kHz,
and then use the
APF tune to pick out the guy I want to copy
On Saturday, October 30, 2010, Robert Harmon k...@pacbell.net wrote:
It is a tool to be used in the real tough cases where the signal is right
down in the noise and you need that extra help to pull him out.
Naieve newbie question, because im missing something here: if the
signal you want is
Pretty good, if the other station is QRP and you are not, if the other station
is DX and
you are a high-power DXer, or if the other station has a K3 too!
On 10/31/2010 10:05 AM, Byron Servies wrote:
On Saturday, October 30, 2010, Robert Harmonk...@pacbell.net wrote:
It is a tool to be used
If he's running 5 watts to a coat hanger antenna on a remote island, and you're
using a 1500-watt amplifier and 3-element beam to go with your beautiful K3,
the chances are quite good:-)
Besides...the APF feature will help us all be able to copy the /QRP at the
end of his call.
Bud, W2RU
Even domestic run-of-the mill contacts with people using a limited antenna
such as a short whip sitting on the patio or a random wire in the attic in
an antenna-restricted neighborhood often produce a much weaker than expected
signal.
Personally, I try to work the weakest signals I can read
On Oct 31, 2010, at 10/3110:05 AM, Byron Servies wrote:
Naieve newbie question, because im missing something here: if the
signal you want is that hard to receive, what are the chances the
other station will be able to hear your reply?
Since I use simple antennas, and even though I
than personal
pride in operating skills. And some of these guys' skills are just amazing.
Bill W5WVO
-Original Message-
From: Kok Chen
Sent: Sunday, October 31, 2010 18:44
To: Elecraft Reflector
Subject: Re: [Elecraft] K3 APF Adjustable Q
On Oct 31, 2010, at 10/3110:05 AM, Byron
advantage of some extra peaking
capability.
N4LQ
Steve
- Original Message -
From: Joe Subich, W4TVli...@subich.com
To:elecraft@mailman.qth.net
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
Joe
What you describe is not 'variable'.
N4LQ
Steve
- Original Message -
From: Joe Subich, W4TV li...@subich.com
To: Guy Olinger K2AV olin...@bellsouth.net
Cc: elecraft@mailman.qth.net
Sent: Sunday, October 31, 2010 4:47 PM
Subject: Re: [Elecraft] K3 APF Adjustable Q
What I have been
peaking
capability.
N4LQ
Steve
- Original Message -
From: Joe Subich, W4TVli...@subich.com
To:elecraft@mailman.qth.net
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
As one who has had his ears pounded for hundred (thousands?) of hours by DX
contest stations whilst trying to listen to a deep weak layer among the
cacophony of strong stations, I am very excited by what I'm hearing
regarding the field test of APF.
While tinkering with the details, Elecraft,
-boun...@mailman.qth.net] On Behalf Of Paul Christensen
Sent: Sunday, October 31, 2010 4:50 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 APF Adjustable Q
I suspect the moment variable Q were to become available, soon thereafter,
the next request would be for variable peaking amplitude
Subich, W4TVli...@subich.com
To:elecraft@mailman.qth.net
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
On 10/31/2010 11:44 AM, Kok Chen wrote:
The same SNR argument applies to how noisy his local RF environment is
compared to your environment
This is often the dominant factor. When I lived in a Chicago
residential neighborhood, my S-meter rarely got below S7 on band noise
with narrow CW
This was exactly my point the other day. The simpler it is, the more useful it
will be in a variety of circumstances. The more tweaking it requires, the less
useful it will be in a pressure situation.
Al W6LX
Juergen said:
APF has to be an instantaneous control that does not require a
I have a different opinion my ham friends.
I don't mind at all an extra knob turning / button pushing to utilize APF.
You don't need the APF functionality all the time.
It is a tool to be used in the real tough cases where the signal is right down
in the noise and you need that extra help to
An adjustable Q would be a desirable APF feature. Also the SHIFT control needs
to be more responsive. It sometimes doesn't keep up with changes while
sweeping the peak frequency. I hope these tweeks can be added in future
firmware. Thanks, Roy Morris W4WFB
John
--- On Fri, 10/29/10, Roy Morris w4...@carolina.rr.com wrote:
From: Roy Morris w4...@carolina.rr.com
Subject: [Elecraft] K3 APF Adjustable Q
To: elecraft@mailman.qth.net
Date: Friday, October 29, 2010, 8:08 PM
An adjustable Q would be a desirable
APF feature. Also the SHIFT control
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