K3 RX Audio
Locked
 
|
Here is a sound sample from the K3. It is best listened to in Stereo. This took place on 160 meters about 20 minutes ago. I am still walking on air. http://www.kkn.net/~tree/160/3b7cQSO.mp3 There is normally an electric fence in the direction I was listening to, but notice you can't hear it. :-) 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
OK, here's what I hear.
A very quiet band, very little noise. A weak nearly subliminal signal. A rough sounding sidetone (hum on the sidetone). Tree, I can copy you just fine, but the 3B7C station I'm catching only a fragment of a letter here and there. I'll assume the rough sound was an issue with your recording setup (RF into the sound card?) or something and is not indicative of the K3's sidetone. How was this recorded? Oh, BTW, congrats on working him on 160 meters!!! - Keith N1AS - - K2 5411.ssb.100 - -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Tree Sent: Thursday, September 20, 2007 10:24 AM To: [hidden email] Subject: [Elecraft] K3 RX Audio Here is a sound sample from the K3. It is best listened to in Stereo. This took place on 160 meters about 20 minutes ago. I am still walking on air. http://www.kkn.net/~tree/160/3b7cQSO.mp3 There is normally an electric fence in the direction I was listening to, but notice you can't hear it. :-) 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
On Thu, Sep 20, 2007 at 07:54:38AM -0700, Darwin, Keith wrote:
> A very quiet band, very little noise. Using a beverage to the SouthWest - and yes - the band was quiet, but part of this is the "context" filter in the K3. It really helps. > A weak nearly subliminal signal. Yup - that's him. I can clearly hear him sending "TR?" once and then "N6TA" but suspect the dit was lost in the rapid QSB. > A rough sounding sidetone (hum on the sidetone). > > Tree, I can copy you just fine, but the 3B7C station I'm catching only a > fragment of a letter here and there. I'll assume the rough sound was an > issue with your recording setup (RF into the sound card?) or something > and is not indicative of the K3's sidetone. That's RF getting into my audio equipment - this was recorded using a computer's sound card and I have some RF issues. What I hear in the headphones has none of that. Here is what the sidetone really sounds like (using the handy TX TEST feature of the K3 that disables output, but lets you oterwise "transmit"): http://www.kkn.net/~tree/160/Sidetone.mp3 > Oh, BTW, congrats on working him on 160 meters!!! THANKS!! Last night, I worked a dozen Europeans as well - so this band is in fine shape very early in the season. 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Darwin, Keith
On Thu, 20 Sep 2007, Darwin, Keith wrote:
> OK, here's what I hear. > > A very quiet band, very little noise. > A weak nearly subliminal signal. > A rough sounding sidetone (hum on the sidetone). I'm glad you posted the above....I listened twice and was going to call the audiologist for a hearning test. But....there was no fence post noise that I could hear. Tree's ability to copy what we can't hear is a testament to wetware. 73 - k3hrn Thom,EIEIO Email, Internet, Electronic Information Officer www.baltimorehon.com/ Home of the Baltimore Lexicon www.tlchost.net/hosting/ Web Hosting as low as 3.49/month _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
Tree,
I'm a little unsure of what I was hearing (except your call!). Maybe it's just me (or my ears or the stereo! hi hi!), but I can just barely make out that there is another station. Regarding the noise: Would it be possible to do an A/B test (with/without noise)? I think that would showcase the K3 filters more effectively. Regards, kurtt Kurt Pawlikowski, WB9FMC The Pinrod Corporation [hidden email] (773) 284-9500 http://pinrod.com Tree wrote: > Here is a sound sample from the K3. It is best listened to in Stereo. > > This took place on 160 meters about 20 minutes ago. I am still walking > on air. > > http://www.kkn.net/~tree/160/3b7cQSO.mp3 > > There is normally an electric fence in the direction I was listening to, > but notice you can't hear it. :-) > > 73 Tree N6TR > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
Oooo, yes, that does sound better. I played it several times just
because it sounded so good! The sidetone does indeed sound better than the K2's sidetone. Thanks! - Keith N1AS - - K2 5411.ssb.100 - -----Original Message----- Here is what the sidetone really sounds like (using the handy TX TEST feature of the K3 that disables output, but lets you oterwise "transmit"): http://www.kkn.net/~tree/160/Sidetone.mp3 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
Tree
What were your filter settings? Sounds like a couple of hundred hertz. I give 599 in contests just as an "acknowledgement of reception", as I would call it. Do dx stations prefer "real" reports or is 599 adequate? On the rare occasions I have been dx, I preferred real reports, but it's a matter of personal preference I guess. David G3UNA ----- Original Message ----- From: "Tree" <[hidden email]> To: <[hidden email]> Sent: Thursday, September 20, 2007 3:23 PM Subject: [Elecraft] K3 RX Audio > > Here is a sound sample from the K3. It is best listened to in Stereo. > > This took place on 160 meters about 20 minutes ago. I am still walking > on air. > > http://www.kkn.net/~tree/160/3b7cQSO.mp3 > > There is normally an electric fence in the direction I was listening to, > but notice you can't hear it. :-) > > 73 Tree N6TR > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
Tree wrote:
> Here is a sound sample from the K3. It is best listened to in Stereo. > > This took place on 160 meters about 20 minutes ago. I am still walking > on air. > > http://www.kkn.net/~tree/160/3b7cQSO.mp3 Well, I listened to it several times and it sure does sound like he came back to someone whose call ended in UA or TA. I couldn't tell at the end if he corrected it. But I'm sure he was hearing you, by the timing. Guess you'll know when the online log gets updated! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
On Thu, Sep 20, 2007 at 07:28:31PM +0100, David Cutter wrote:
> What were your filter settings? Sounds like a couple of hundred hertz. So - the filter I was using is something like this: 150 hertz in the center of the passband. This has a rather sharp cutout, but only goes down something like 10 or 15 db to the second filter. The second filter is wider - 400 hz. Which matches the roofing filter. This is the context filter I keep talking about. It really seems to help my ears cut down on the noise - but still leaving some of the energy outside the passband which I believe is useful in weak signal work (ask a moonbouncer what filter they prefer to use - and most of them will tell you an SSB filter). Also - if you are listening in stereo - your are experiencing one of the audio effects that have been programmed into the DSP. It is delaying the sound in one ear slightly to the other ear - and to my ear, this makes copying signals easier. This feature is going to be improved with some fancy work to spread the frequencies across the stereo spectrum (binaural audio) - and of course, if you get the second RX board, you can use it for diversity reception which will really help get those missing dits at the end of your callsign as the signal experiences QSB. :-) > I give 599 in contests just as an "acknowledgement of reception", as I > would call it. Do dx stations prefer "real" reports or is 599 adequate? > On the rare occasions I have been dx, I preferred real reports, but it's a > matter of personal preference I guess. Ah - I knew this would get asked as some point. DX-pedition stations prefer a 599 report as they don't have to do anything to change the entry in their computer. They get tired after many hours of operating field day style and anything to conserve energy is a good thing. This includes only sending 599 so they don't expend the mental energy of computing a signal report and trying to get it logged correctly. I am sure there are those on this list who feel this is not what Hiram had in mind - but it is the way the game is played, for better or worse. The point of this recording wasn't to provide a spark for a debate about DX-pedition operating technique - but rather to give a sample of what the K3 sounds like. I'll try to post some more sound files from an upcoming European opening on 160 for y'all. 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Vic K2VCO
On Thu, Sep 20, 2007 at 01:20:11PM -0700, Vic K2VCO wrote:
> Tree wrote: > >Here is a sound sample from the K3. It is best listened to in Stereo. > > > >This took place on 160 meters about 20 minutes ago. I am still walking > >on air. > > > >http://www.kkn.net/~tree/160/3b7cQSO.mp3 > > Well, I listened to it several times and it sure does sound like he came > back to someone whose call ended in UA or TA. I couldn't tell at the end > if he corrected it. But I'm sure he was hearing you, by the timing. > Guess you'll know when the online log gets updated! Well - you have to realize that rapid QSB is the name of the game here. He had TR obviously at the start - and filled in the N6 part clearly. Another station who was listening to this QSO from a better vantage point said that he had my call right the whole time. There was no doubt he was working me (in my mind). I hope he logged the call correctly - I will see on the online log page. 73 Tree _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
I agree in contesting, perhaps the only exception I make is those one or two
stations with <<T9 note, but when I have been a dxp station I wanted to know how my portable antennas fair, tho I must say I routinely give the callers 599. Yes, after several hours operating in the tropics at high temp and humidity, it gets somewhat tiring and automated responses help a lot. Thanks for info on the filter settings, I look forward to trying this. David G3UNA ----- Original Message ----- From: "Tree" <[hidden email]> To: "David Cutter" <[hidden email]> Cc: <[hidden email]> Sent: Thursday, September 20, 2007 9:31 PM Subject: Re: [Elecraft] K3 RX Audio > On Thu, Sep 20, 2007 at 07:28:31PM +0100, David Cutter wrote: > >> What were your filter settings? Sounds like a couple of hundred hertz. > > So - the filter I was using is something like this: > > 150 hertz in the center of the passband. This has a rather sharp cutout, > but > only goes down something like 10 or 15 db to the second filter. > > The second filter is wider - 400 hz. Which matches the roofing filter. > > This is the context filter I keep talking about. It really seems to > help my ears cut down on the noise - but still leaving some of the > energy outside the passband which I believe is useful in weak signal > work (ask a moonbouncer what filter they prefer to use - and most of > them will tell you an SSB filter). > > Also - if you are listening in stereo - your are experiencing one of > the audio effects that have been programmed into the DSP. It is delaying > the sound in one ear slightly to the other ear - and to my ear, this > makes copying signals easier. This feature is going to be improved > with some fancy work to spread the frequencies across the stereo > spectrum (binaural audio) - and of course, if you get the second RX > board, you can use it for diversity reception which will really help > get those missing dits at the end of your callsign as the signal > experiences QSB. :-) > >> I give 599 in contests just as an "acknowledgement of reception", as I >> would call it. Do dx stations prefer "real" reports or is 599 adequate? >> On the rare occasions I have been dx, I preferred real reports, but it's >> a >> matter of personal preference I guess. > > Ah - I knew this would get asked as some point. DX-pedition stations > prefer a 599 report as they don't have to do anything to change the > entry in their computer. They get tired after many hours of operating > field day style and anything to conserve energy is a good thing. This > includes only sending 599 so they don't expend the mental energy > of computing a signal report and trying to get it logged correctly. > > I am sure there are those on this list who feel this is not what > Hiram had in mind - but it is the way the game is played, for better > or worse. The point of this recording wasn't to provide a spark for > a debate about DX-pedition operating technique - but rather to give > a sample of what the K3 sounds like. > > I'll try to post some more sound files from an upcoming European opening > on 160 for y'all. > > 73 Tree N6TR _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Darwin, Keith
> Here is what the sidetone really sounds like (using the handy TX TEST
> feature of the K3 that disables output, but lets you oterwise > "transmit"): > > http://www.kkn.net/~tree/160/Sidetone.mp3 It does sound good -- and different. It almost sounds like there's some kind of phase difference between right and left ears when using headphones. Is the K3 doing any kind of stereo processing to the sidetone signal to make it sounds so "good" (or different)? I had to admit, I didn't even copy the call sign in the .mp3 sample because I was so distracted by the different sounding sidetone. Not sure if that's a good thing. I'm just curious... is it a deliberate design decision or just some side effect of converting it to the .mp3 file or what? .. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by N6TR
Tree wrote:
> http://www.kkn.net/~tree/160/3b7cQSO.mp3 MP3 is probably not a good choice for critical evaluation of the audio of a DSP based system, as it involves heavy additional DSP to produce it. In particular, MP3 works by limiting close in dynamic range (because the ear cannot hear weaker sounds close to a strong one), so weak signals which are close to strong ones will be reproduced with worse resolution, or lost. (It's a bit more complex than that as it is done on frequency blocks.) It's also a block based encoder and, although I'm not sure, it is possible that it loses phase information and fakes wideband noise. (I presume it must retain low frequency phase information, for stereo to work, but I don't know if it encodes I and Q in all frequency bands or whether it falls back to just power at the higher ones.) Even if it retains phase, I wouldn't expect it to reproduce multi-tone or, in particular, noise like digital modes well, and if you can hear subtle DSP artefacts in the K3 you can probably hear those resulting from MP3 encoding. Unfortunately, doing an extra A to D / D to A pair is inevitable, given there is no digital output, but it needs to be done at a carefully chosen sample rate. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |