Tayloe Dan-P26412 wrote:
single composite receiver with a lower noise floor. If you
added just enough RF pre-amplification to overcome the signal
splitting loss to N receivers, adding more and more receivers
Only if the pre-amplifiers are noiseless, or at least contribute
equivalent input
On Tue, 18 Nov 2008 08:03:53 +, David Woolley (E.L) wrote:
In this case, there is no splitting loss, and the noise is uncorrelated
because it is being received at different locations.
It's a risky to assume that ALL RX noise is uncorrelated after being
detected. While there may be
Vic K2VCO wrote:
Joe Subich, W4TV wrote:
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.
I just tested
I mentioned this just the other day. By ability to copy the DX station is
much reduced when only hearing him/her in one ear. I either have to crank
up the main rx AF gain considerably or go back to one rx and use REV. I've
used a variety of audio filters over the years--none is necessary with
I had the same problem and its due to the 3db drop when dual is on.
I believe Dunestar has such a device on their website.
http://www.dunestar.com/model842.htm
-
73,
Greg - AB7R
Whidbey Island WA
NA-065
On Mon Nov 17 7:10 , W7TEA sent:
I mentioned this just the
And of course it just came to me that the problem will still be there when DUAL
is on regardless of
using the external mixer box or not. :)
-
73,
Greg - AB7R
Whidbey Island WA
NA-065
On Mon Nov 17 7:41 , Greg - AB7R sent:
I had the same problem and its due to the
Greg - AB7R wrote:
And of course it just came to me that the problem will still be there when DUAL is on regardless of
using the external mixer box or not. :)
Greg - AB7R
And of course, it is still another external box one has to add just to
get any mixing. Mixing that I'd much
Sorry, but I posted to the wrong thread last time. My comments belong here!
The Behringer 802 mixer is inexpensive and will do that for you (plus a
lot of other stuff)
Feed each receiver's audio into the Line IN jack below the microphone
jacks. The PAN control will be used to adjust the
I think the questions regarding addition of noise from one Rx to the
other Rx are interesting but not entirely relevant to my own use of the
dual receivers for split frequency DXing.
Here's the way I normally deal with a split frequency pileup (using a CW
pileup as an example). Remember that
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
.
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: elecraft@mailman.qth.net
Subject: [Elecraft] K3: listening to both rcvrs
for what it may be worth
] 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
]
[mailto:[EMAIL PROTECTED] On Behalf Of Joe Subich, W4TV
Sent: Sunday, November 16, 2008 12:09 PM
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
PROTECTED] On Behalf Of cloud runner
Sent: Sunday, November 16, 2008 11:03 AM
To: elecraft@mailman.qth.net
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
All,
Cross-over audio between the Main and Sub receiver is part of the menu
in a FT1000MP from 1996. (as a lot of you people probably know)
You can choose it in the menu how you want the audio: seperate,
mono-mixed or bit of stereo cross-over.
Absolutely wonderful.
There have been several other
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dr.
James C. Garland
Sent: Sunday, November 16, 2008 12:19 PM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3: listening to both rcvrs
Joe,
Your comment strikes me as unnecessarily negative. (Pollute?
Crosstalk?) I thought
On Nov 16, 2008, at 1:52 PM, Joe Subich, W4TV wrote:
Assuming equal volume settings and equal bandwidths in the two
receivers, the S/N will degrade by 6 dB (twice the noise voltage).
Unless the noise is correlated, the probability density function from
summing two random variables causes
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: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3: listening to both rcvrs
Joe,
Your
Joe Subich, W4TV wrote:
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.
I just tested an experimental feature (I
That feature would be desireable for me... --... ...-- Dale - WC7S in Wy Date:
Sun, 16 Nov 2008 15:57:19 -0800 From: [EMAIL PROTECTED] To: [EMAIL
PROTECTED] Subject: Re: [Elecraft] K3: listening to both rcvrs CC:
elecraft@mailman.qth.net Joe Subich, W4TV wrote: The K3 receivers are
better
.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kok Chen
Sent: Sunday, November 16, 2008 5:10 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] K3: listening to both rcvrs
On Nov 16, 2008, at 1:52 PM, Joe Subich, W4TV wrote:
Assuming
.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Joe Subich, W4TV
Sent: Sunday, November 16, 2008 7:06 PM
To: 'Kok Chen'; 'Elecraft Reflector'
Subject: RE: [Elecraft] K3: listening to both rcvrs
So the reduction in SNR (assuming equal noise power
Chen'; 'Elecraft Reflector'
Subject: RE: [Elecraft] K3: listening to both rcvrs
So the reduction in SNR (assuming equal noise power) is
3.01 dB, not 6 dB.
That's the best case if the noise power is equal. If the
other receiver has higher noise power (wider bandwidth,
more interfering
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