My votes in this contest, can we win a P3 :-)
wav #1 is K3.
recognized by:
-cleanest overall passband (the others obviously have substantial wideband
gain *after* the CW filter,resulting in surrounding WB noise)
-but K3 has most bumpy-road agc of the 3
73'
Paul
PD0PSB
Delete this message now
Paul,
The K3 bumpy road AGC can be cured by use of the AGC menu Threshold
and Slope parameters, there is no reason for it to be bumpy. Try
Threshold 008 and Slope 002 for an AGC response that behaves much like
the K2. The slope can be increased if you want all signals to sound
closer to the
I find that #1.wav is the most 'quiet' recording because it contains
only low frequency (in-passband) content. I believe that is the K3.
The others have significant response outside the filter passband, and I
would refer to that content outside the passband as noise. I would
not refer to
Clear Don,
I was referring to this particular wav file, where the AGC threshold is
clearly set low and interacting quite strongly with the noisefloor.
But ofcourse, not sure yet if I picked the right file :-)
73'
Paul
PD0PSB
Don Wilhelm-4 wrote:
Paul,
The K3 bumpy road AGC can be
Excuse me, but are all of you guys listening to NOISE ONLY? I
mean...noise WITHOUT a signal? What good is that? Sorry, but I never
listen to noise on purpose.
I cannot see any practical value in such a test.
de Doug KR2Q
__
Elecraft
Doug,
*I* do that all the time - but I have a purpose, to align a K2 filter
passband. In fact, I add noise at the antenna input with an Elecraft N-Gen.
When listening to any band, if the ambient noise level is high, I turn
off the preamp and even turn on the attenuator and in some cases reduce
that distortion, artifacts and
whatever else you want to call stuff that shouldn't be there all contributed to
fatigue and the ear-brain's ability to discern signals.
Wes N7WS
--- On Thu, 1/7/10, DOUGLAS ZWIEBEL doug...@gmail.com wrote:
From: DOUGLAS ZWIEBEL doug...@gmail.com
Subject: [Elecraft] three
, artifacts
and whatever else you want to call stuff that shouldn't be there all
contributed to fatigue and the ear-brain's ability to discern signals.
Wes N7WS
--- On Thu, 1/7/10, DOUGLAS ZWIEBEL doug...@gmail.com wrote:
From: DOUGLAS ZWIEBEL doug...@gmail.com
Subject: [Elecraft] three
Delete this message now if you are sick and tired of hearing about noisy
receivers.
I have made three recordings of three different receivers tuned to 40 meter
band noise, all with CW bandwidth of (nominally) 500 Hz centered near 550 Hz
sidetone, all with the RF gain full up. One of the three
The spectra can be seen at
http://homepage.mac.com/chen/temp/audio1.png
http://homepage.mac.com/chen/temp/audio2.png
http://homepage.mac.com/chen/temp/audio2.png
(Estimated using cocoaModem's spectrum display with 1.5 second exponential
averaging of each FFT bin. Please ignore the red
On Jan 6, 2010, at 9:08 PM, Kok Chen wrote:
The spectra can be seen at
http://homepage.mac.com/chen/temp/audio1.png
http://homepage.mac.com/chen/temp/audio2.png
http://homepage.mac.com/chen/temp/audio2.png
Oops, the last one should be
http://homepage.mac.com/chen/temp/audio3.png
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