[Elecraft] Line In cabling

[Don Brown]

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: Wingkeel at aol.com<mailto:Wingkeel at aol.com> 
  To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net> 
  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
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