Hi Jim,
I agree, something isn't right with my K3 Line-in. Fortunately the microphone input works perfectly with my Tascam US100 external sound card. Thanks for your recommending that superb device. According the the K3 manual, K3 Line-in is designed for 1 volt p-p and has 10K input impedance. Someday I'll try a different K3... tks 73 Frank W3LPL ----- Original Message ----- From: "Jim Brown" <[email protected]> To: [email protected] Sent: Wednesday, December 6, 2017 4:04:54 AM Subject: Re: [Elecraft] K3 and WSJT-X Split operation. Hi Frank, Something seems not right. The output stage of many (most?) computer sound cards is usually also used to drive headphones, and typically provide at least a volt, which is approximately line level for consumer devices, and output Z is usually fairly low (<500 ohms). In the audio world, inputs are, by convention, high impedance (>10K). Did the radio designer screw up and stick a low value resistor across the line input? My general advice is to run the computer sound card about 6 dB below clip, because it is common for distortion to rise by 10 dB with that 6 dB difference in output level. How much drive does that rear panel Line In need? 73, Jim K9YC On 12/5/2017 5:50 PM, [email protected] wrote: > I have the same problem with inadequate audio from my sound card > when I use the rear panel Line In connector. But it works great if > I use the front panel microphone connector. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
