[Elecraft] K3 and WSJT-X Split operation.

[donovanf at starpower.net]

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" <jim at audiosystemsgroup.com> 
To: elecraft at mailman.qth.net 
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, donovanf at starpower.net 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. 


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