Line In cabling
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Hi everyone,
I am going to use the Spectrogram software to align my K2. When I build the cable to go from the earphone jack to the Line In on my sound card, do I wire it for mono or stereo? Mono or stereo plugs? Speaker wire or thin coax? Thanks Terry Southern de KC0QZX _______________________________________________ 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 |
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Hi
Although you can use a standard stereo mini plug to mini plug to connect the headphone jack to the sound card, it is not the best choice. The headphone jack has some filtering that will roll off the high end. I built up a little box with a 4 ohm load resistor and a RCA jack so I can connect a cable to the external speaker jack with a RCA plug to mono mini plug. I also built a cable with the little two pin speaker connector like in the K2 on one end and a RCA plug on the other. The 4 ohm resistor is connected to a stereo jack on the other side of the box with two 1K resistors in series with each channel. The stereo jack then connects to the sound card with a standard stereo mini to mini plug. This works with line level inputs on the sound card. If your computer only has mic level inputs then you will need to build two voltage dividers between the 4 ohm resistor and the stereo jack, one for each channel. Something like a 10K and a 1K should work. Don Brown KD5NDB ----- Original Message ----- From: [hidden email]<mailto:[hidden email]> To: [hidden email]<mailto:[hidden email]> Sent: Friday, July 16, 2004 4:22 PM Subject: [Elecraft] Line In cabling Hi everyone, I am going to use the Spectrogram software to align my K2. When I build the cable to go from the earphone jack to the Line In on my sound card, do I wire it for mono or stereo? Mono or stereo plugs? Speaker wire or thin coax? Thanks Terry Southern de KC0QZX _______________________________________________ Elecraft mailing list Post to: [hidden email]<mailto:[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<http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/subscribers.htm<http://mailman.qth.net/subscribershtm> Elecraft web page: http://www.elecraft.com<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 |
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In reply to this post by Wingkeel
'Tis better to use the auxiliary speaker jack on the back of your K2 to your
computer, NOT the headphone jack. That's because there is some frequency shaping done in the phones output that distorts your spectrogram display. And then it's mono-a-mono <G>. Ron AC7AC -----Original Message----- Hi everyone, I am going to use the Spectrogram software to align my K2. When I build the cable to go from the earphone jack to the Line In on my sound card, do I wire it for mono or stereo? Mono or stereo plugs? Speaker wire or thin coax? Thanks Terry Southern de KC0QZX _______________________________________________ _______________________________________________ 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 |
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In reply to this post by Wingkeel
Terry,
You should go from the speaker jack on the K2 to a line in jack on the sound card. The headphone jack audio source rolls-off some of the highs and will make it a little harder to set the filters up. The speaker out is mono, so I would just use one channel. Some systems will treat the the left channel as a mono source, but it really doesn't matter. A shielded cable is better, but as long as it is fairly short anything should be fine. Darrell VE7CLA On Fri, 2004-07-16 at 14:22, [hidden email] wrote: > Hi everyone, > > I am going to use the Spectrogram software to align my K2. When I build > the cable to go from the earphone jack to the Line In on my sound card, do I > wire it for mono or stereo? Mono or stereo plugs? Speaker wire or thin coax? > _______________________________________________ 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 |
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In reply to this post by Don Brown-4
I did something similar as a project:
http://homepage.mac.com/jfmenard/PhotoAlbum21.html Just exclude the PTT control part, the rest is for connecting a line out to the line-in of your computer or stereo system. I use a 600 ohm to 600 ohm transfo to isolate the circuit, etc.. Le 04-07-16, à 17:50, Don Brown a écrit : > Hi > > Although you can use a standard stereo mini plug to mini plug to > connect the headphone jack to the sound card, it is not the best > choice. The headphone jack has some filtering that will roll off the > high end. I built up a little box with a 4 ohm load resistor and a RCA > jack so I can connect a cable to the external speaker jack with a RCA > plug to mono mini plug. I also built a cable with the little two pin > speaker connector like in the K2 on one end and a RCA plug on the > other. The 4 ohm resistor is connected to a stereo jack on the other > side of the box with two 1K resistors in series with each channel. The > stereo jack then connects to the sound card with a standard stereo > mini to mini plug. This works with line level inputs on the sound > card. If your computer only has mic level inputs then you will need to > build two voltage dividers between the 4 ohm resistor and the stereo > jack, one for each channel. Something like a 10K and a 1K should work. > > Don Brown > KD5NDB > > > ----- Original Message ----- > From: [hidden email]<mailto:[hidden email]> > To: [hidden email]<mailto:[hidden email]> > Sent: Friday, July 16, 2004 4:22 PM > Subject: [Elecraft] Line In cabling > > > Hi everyone, > > I am going to use the Spectrogram software to align my K2. > When I build > the cable to go from the earphone jack to the Line In on my sound > card, do I > wire it for mono or stereo? Mono or stereo plugs? Speaker wire or > thin coax? > > Thanks > > Terry Southern de KC0QZX > _______________________________________________ > Elecraft mailing list > Post to: [hidden email]<mailto:[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<http:// > mailman.qth.net/mailman/listinfo/elecraft> Help: > http://mailman.qth.net/subscribers.htm<http://mailman.qth.net/ > subscribershtm> > Elecraft web page: http://www.elecraft.com<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 Jean-François Ménard / VA2VYZ [hidden email] Club d'Astronomie Amateur de Sherbrooke Club Radio Amateur de l'Estrie Mon site web personnel : http://homepage.mac.com/jfmenard =============================================== _______________________________________________ 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 |
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