Joe Subich, W4TV-4 wrote:
Here is the genesis of the complaint that the K3 is more
fatiguing than other receivers. The out of band noise
(noise above 5 KHz) in the K3 is, as you say, at least 60 dB
below the peak audio level (actually, I measure it at more
than 90dB down above 5
If the K3 is being used by a contest group or dxpedition, for instance, you
will have a wider range of hearing sensitivities and these activities force
us to concentrate a lot more and use a radio for long periods. On this
basis, fatigue due to these artefacts should be eliminated for the
Sorry, I don't buy the theory that the low-level stopband artifacts are
responsible for the perception of the K3 being noisy. To my ears and
tests I've conducted multiple times, the artifacts are audibly masked in
listening, even without the LPF.
On spectrum analysis, I see artifacts in
Message
From: Joe Subich, W4TV li...@subich.com
To: d...@w3fpr.com; Al Lorona alor...@sbcglobal.net
Cc: Elecraft Reflector elecraft@mailman.qth.net
Sent: Fri, January 8, 2010 8:46:21 PM
Subject: RE: [Elecraft] RX Test (long)
However, the stopband also has
many leakage products (DAC
] RX Test (long)
If the K3 is being used by a contest group or dxpedition, for instance,
you
will have a wider range of hearing sensitivities and these activities
force
us to concentrate a lot more and use a radio for long periods. On this
basis, fatigue due to these artefacts should
Subich, W4TV li...@subich.com
To: d...@w3fpr.com; Al Lorona alor...@sbcglobal.net
Cc: Elecraft Reflector elecraft@mailman.qth.net
Sent: Fri, January 8, 2010 8:46:21 PM
Subject: RE: [Elecraft] RX Test (long)
However, the stopband also has
many leakage products (DAC artifacts) in the stopband
Sent: Fri, January 8, 2010 8:46:21 PM
Subject: RE: [Elecraft] RX Test (long)
However, the stopband also has
many leakage products (DAC artifacts) in the stopband some
of which are as much as 50 dB ABOVE the noise floor.
While these products are well below the desired audio
headphones and/or speaker.
73,
... Joe, W4TV
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Julian, G4ILO
Sent: Saturday, January 09, 2010 5:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] RX Test
; elecraft@mailman.qth.net
Sent: Saturday, January 09, 2010 8:55 AM
Subject: Re: [Elecraft] RX Test (long)
H
I suppose I am in the category where my hearing is impaired. At least
my
wife informs me near daily that such is the case.
I was the oldest of the 13 operators blessed
I agree. These artificacts have sidebands that increase and
decrease with content in the normal passband, but their separation and
frequency span is as if the frequency content (not the amplitude) of
the normal passband were divided by 2 or 4. They are way down, and do
not exceed the amplitude
As I recall it was RCA at the dawn of HI-FI who did a test using a
live orchestra and a physical passband filter to garner listener
response. The audience did not know whether the filter was in or not
The results were that people found the orchestra without the filter
sounded unnatural.
Hi, Everybody,
What great comments I got from you in private e-mail messages. It's highly
interesting getting your perspectives on receivers and listening.
Due to day job and family I can't respond to every observation and
objection but in particular Doug KR2Q-- who has some of the best ears
Al,
From the tests I have done, I discovered that the K3 has a flat
passband and very sharp filter skirts - in fact, very close to the
ideal filter sought by many in past years. Other receivers tested
(K2, Yaesu FT-900, FT-817) showed that their passband was not flat, but
tapered smoothly
I might add - perception is 99% of reality. I write of theoretical
terms, but how the human ear/brain combination perceives things of this
nature is indeed a subject for reflection and discussion.
I expect that there will be many on both 'sides of the fence'.
73,
Don W3FPR
Al,
From the
I've also considered that theory. It would be interesting (and easy
with an external audio mixer) to add a little pink noise to the audio
output to see if that mellows the sound a bit.
73
--
Joe KB8AP
On Jan 8, 2010, at 6:05 PM, Don Wilhelm wrote:
So my supposition is that we are not
Why would you not want to look at the noise footprints with a spectrum
analyzer? Your ear may tell you that there is something there that you
don't like, but the spectrum analyzer will tell you what it is. If you
are making audio files, send me a copy and I'll take a look at them for
you
,
... Joe, W4TV
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Friday, January 08, 2010 9:06 PM
To: Al Lorona
Cc: Elecraft Reflector
Subject: Re: [Elecraft] RX Test (long)
Al
8:46:21 PM
Subject: RE: [Elecraft] RX Test (long)
However, the stopband also has
many leakage products (DAC artifacts) in the stopband some
of which are as much as 50 dB ABOVE the noise floor.
While these products are well below the desired audio in the
passband, they are in the clear
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