Agreed.
73
Bob, K4TAX
On 1/22/2016 2:13 PM, Al Lorona wrote:
Okay, I see what you're looking at... I believe that's a plot of the
output of a simulation, whereas in practice he's seeing about 2.5 dB
[re: the original technical article in QEX Nov/Dec 2014].
Al W6LX
Re: QST February 2015, page 30, Figure 1 "Conventional SSB (blue)
compared to CESSB (red) have the same PEP, but the average power of
CESSB is 2.28 times greater."
I amend my statement from 2.5 to 2.28.
73
Bob, K4TAX
On 1/22/2016 1:47 PM, Al Lorona wrote:
Slight correction: not a factor
Okay, I see what you're looking at... I believe that's a plot of the output of
a simulation, whereas in practice he's seeing about 2.5 dB [re: the original
technical article in QEX Nov/Dec 2014].
Al W6LX
__
Elecraft mailing
OOPs that should be 2016 on the QST date. Sorry.
73
Bob, K4TAX
On 1/22/2016 1:57 PM, Bob McGraw K4TAX wrote:
Re: QST February 2015, page 30, Figure 1 "Conventional SSB (blue)
compared to CESSB (red) have the same PEP, but the average power of
CESSB is 2.28 times greater."
I amend my
On Fri,1/22/2016 9:27 AM, Guy Olinger K2AV wrote:
The method is proprietary.
I'm quite assured Wayne is reading up on CESSB. But I could hardly blame
him for not wanting to engage in an open discussion on a proprietary
process that is embedded in a proprietary SDR radio operating system. It's
Slight correction: not a factor of 2.5, but 2.5 dB, which is a factor of about
1.8.
Al W6LX
>>> It is interesting note that the CESSB methodology
>>>increases the average power by a factor of some 2.5.
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Elecraft mailing list
I have studied and measured both the Compression algorithm and, as a
separate project, the ALC operation using my K3S. It is clear the ALC
system is very different as implemented in the K3S from other radios in
as much as there is some gain ranging which occurs below the 5th bar of
ALC
Given the recent article in QST explaining CESSB I looked for some detail
about the compression algorithm of the K3 but found nothing explaining how
it works.It is the most effective processing I have ever used and appears
to double the transmit power. So perhaps it is a version of CESSB or
The method is proprietary.
I'm quite assured Wayne is reading up on CESSB. But I could hardly blame
him for not wanting to engage in an open discussion on a proprietary
process that is embedded in a proprietary SDR radio operating system. It's
called protecting one's commercial advantage.
There
I wouldn't expect there to be.
Firmware is the holy grail of SDR and is really the only thing that
differentiates one rig from another.
As such it should be protected and proprietary.
On 1/22/2016 9:47 AM, Robert Sands wrote:
Is there a published explanation of the compression algorithm? (not
Yes I agree. And I find the compression algorithm and ALC tables are
really difficult to figure out from the outside world too.
73
Bob, K4TAX
On 1/22/2016 7:35 PM, Kevin Stover wrote:
I wouldn't expect there to be.
Firmware is the holy grail of SDR and is really the only thing that
I have my CMP at 25 which for my K3 is the max before the audio is degraded. My
MIC at 28. The microphone is a Shure Dynamic with relatively low output. I get
reports of fantastic audio and powerful audio and almost always break
through pileups. The K3 has proven to be a great sideband rig in
Snip
I opened by first time my compressor up to 30 which I believe is
compressing a lot but still TX audio is clean, not distorded but very
powerful, with the use of the 8 bands EQ I have today and tomorrow
a very punchy high speech audio.
End snip
Well I would have thought depending on the mic
Hello all,
Does the compression setting directly correlate to the scale on the LCD?
For example if turn compression to 10, the actual compression amount is more
like 2-3 dB instead of 10 as I would expect. The meter deflects to the 2nd
or 3rd line between 0 and 10. If I turn it to 20, the
Does the compression setting directly correlate to the scale on the LCD?
No.
The CMP reading is the instantaneous amount of compression, with a bit
of decay time so you can see the peak if it is changing rapidly.
The value displayed in the VFO B area is just a relative number relating
to the
I believe compression and equalization are both automatically
disabled when in a data mode (including DATA A).
Tx EQ is currently set for the radio, not the mode. Likewise Rx EQ.
Compression is disabled for DATA modes that use audio input (DATA A,
AFSK) and restored for USB/LSB operation.
Yes, the noise gate is also disabled in data modes.
73, Eric WA6HHQ
---
Bill W5WVO wrote:
I believe compression and equalization are both automatically
disabled when in a data mode (including DATA A). Not sure about
the new noise gating feature, but I would think for consistency,
it would be
I am curious about this, but not sure...
I understand that the input gain on transmit is separately settable for
front panel vs. rear audio in.
But, it would make sense to me if the compression and gating were also
separately adjustable, front and rear.
Why? Because when I operate phone, I
Ron,
as it turns out, I am using Line in to connect the sound card output,
but I am still seeing compression on the meter.
What gives?
Thanks 73 de Dave, W5SV
Ron Kenwood wrote:
Hi Dave:
The usual practice for sound card digital modes is to use line in
instead of the rear panel mic.
Dave,
According to the manual (pg 31, Data Mode Selection):
If you prefer to use LSB or USB, you'll need to manually set CMP to 0
to prevent data signal distortion.
I believe if you use DATA mode instead of USB/LSB, compression is
automatically disabled.
73
--
Joe KB8AP
On Dec 8, 2008,
[EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Monday, December 08, 2008 10:54 AM
Subject: [Elecraft] K3 compression settings
I am curious about this, but not sure...
I understand that the input gain on transmit is separately
settable for
front panel vs. rear audio in.
But, it would
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