From my perspective of 20+ years of doing this, I stand firmly by my
statement that having the weak, noisy DX in the "middle of my head"
(both ears) makes it easier for me to copy in conjunction with the
pileup noise than copying with the DX "out to the left" with the pileup
noise to the right. Thats my observation. It works best FOR ME! It
doesn't mean others are the same. Remember that the brain is the
ultimate mixer and filter and mine adapts to pulling out the weak DX
from the noise best when it's in the "middle of my head". Yes, turning
off the sub to copy the main is a better situation for copying the DX.
That's not the issue. */I'm trying to simultaneously listen to the
pileup too! /* This works for me! your theories are fine for the physics
of electronics up to the headphones. It's what happens after the sound
energy goes into the ears that is my issue. My brain halves are still
connected to each other and separate ear feeds probably recombine in the
brain differently for different people! I'm only stating how I, as a
long time dual receiver user, can best use the second receiver in the
split weak DX pile-up situation.. Kenwood, TenTec and apparently Yeasu
realize this too.
Mike
DXCC #1Honor Roll from a noisy city lot
Joe Subich, W4TV wrote:
Jim,
Unless one is using diversity with phase locked signals, adding
the uncorrelated noise from one receiver to the signal from the
other receiver reduces the overall s/n. While you may think my
use of the term "pollution" is unnecessarily negative, it is an
accurate description.
Assuming equal volume settings and equal bandwidths in the two
receivers, the S/N will degrade by 6 dB (twice the noise voltage).
If one is listening to a desired DX station with a low noise
antenna and the pile-up with a wider filter and a noisy transmit
antenna, the S/N will be degraded even more.
The K3 receivers are better isolated that other "dual receiver"
transceivers. It would be a shame to degrade S/N by adding a
mix control when it is relatively easy to do so externally or
those who don't mind the hit in S/N.
73,
... Joe, W4TV
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dr.
James C. Garland
Sent: Sunday, November 16, 2008 12:19 PM
To: [email protected]
Subject: RE: [Elecraft] K3: listening to both rcvrs
Joe,
Your comment strikes me as unnecessarily negative. (Pollute?
Crosstalk?) I thought Fred's suggestion, coming as it does
from a very experienced CW contester, makes a lot of sense.
73,
Jim W8ZR
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:elecraft-
[EMAIL PROTECTED] On Behalf Of Joe Subich, W4TV
Sent: Sunday, November 16, 2008 10:09 AM
To: 'cloud runner'; 'Elecraft Reflector'
Subject: RE: [Elecraft] K3: listening to both rcvrs
If you must pollute the audio from one receiver with audio from the
other receiver, add a 5 to 10K pot between the tip and the ring of
your headphones and adjust it for the level of pollution you need.
There is no need for Wayne (or probably Lyle) to design
crosstalk into
the DSP process.
73,
... Joe, W4TV
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
cloud runner
Sent: Sunday, November 16, 2008 11:03 AM
To: [email protected]
Subject: [Elecraft] K3: listening to both rcvrs
for what it may be worth...
For my pair-of-K2's in SO2R, I have routed the audio in
such a way
that I have a balance control with the audio from the two
radios. I
call it a mixing control. I find that "optimum" is achieved when
the full strength audio is in one ear, and that same audio is
present, but weak in the other ear. I reason that when the audio
goes to one ear only, the content must get to the other
hemisphere
of the brain within brain circuitry. When it is routed to both
ears, now both hemispheres get the information for
interpretation at
the same time. Making it strong in one ear and weak in the
other, reversed for the other channel, lets me know which
rcvr I am hearing, while brain interpretation is at full speed.
and so, Wayne...
I think that there must be a firmware way either by routing to a
panel pot, or probably more simply in a menu, by which
the operator
can select either complete channel isolation, or both channels to
both ears, but with one ear X DB down from the other. (I
can't say
how much down is best,but I find that it is enough when I
can barely
notice it. All of a sudden copy is MUCH easier). Give
it a thought
because of the above, I, at least, am quite convinced
after a lot of
usage with a pair of K2's in SO2R, that is a much better
arrangement for copying CW from the two channels.
with much appreciation for this fine radio,
73, Fd - KT5X
K2 # 0700
K3 # 0144
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