Re: [Elecraft] K3: listening to both rcvrs - Reduced receiver noise floor

2008-11-18 Thread Jim Brown
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 differe

Re: [Elecraft] K3: listening to both rcvrs - Reduced receiver noise floor

2008-11-18 Thread David Woolley (E.L)
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

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Mike Cox
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

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Don Wilhelm
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 amoun

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Brian Alsop
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 prefer

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Greg - AB7R
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 3

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Greg - AB7R
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 o

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread W7TEA
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

Re: [Elecraft] K3: listening to both rcvrs

2008-11-17 Thread Bill W4ZV
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

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Dr. James C. Garland
, November 16, 2008 5:06 PM > To: 'Kok 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 n

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread NZ8J
s are available. -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

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Joe Subich, W4TV
it doesn't impose a S/N penalty otherwise. > -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 > &g

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Dale Putnam
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:&

Re: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Vic K2VCO
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 h

Re: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Mike Cox
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 T

Re: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Kok Chen
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 var

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Joe Subich, 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 comment st

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Arie Kleingeld PA3A
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 w

Re: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Mike Cox
ess. 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... For my

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread NZ8J
PROTECTED] [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 othe

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Dr. James C. Garland
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

RE: [Elecraft] K3: listening to both rcvrs

2008-11-16 Thread Joe Subich, W4TV
. 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 > > &g

[Elecraft] K3: listening to both rcvrs

2008-11-16 Thread cloud runner
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 pre