[Elecraft] Connecting a KX2 to a Laptop--RESOLVED

[ke1b at richseifert.com]

> On Sep 14, 2018, at 9:57 AM, Brad Noblet <bnoblet at gmail.com> wrote:
> 
> Rich - For older iPhones with an 1/8” headset jack, you needed to put a 2k resistor to ground on the mic pin for the iPhone to enable audio input.  This may be true for Mac laptops mic inputs as well.  So if your KX2 has audio out with nothing connected, you might try that.  As the mic jack has DC on it to power the microphone it assumes you’re plugging in, you’ll obviously need to capacitively couple your audio source.  The 2k resistor draws the DC current to fake out the Mac into believing you plugged in a mic.  I shot 2 days trying to track this down when it happened to me.  
> 

Now that I have a *working* configuration (with a simple mono cable), I may optimize it by making a cable that takes the two stereo outputs from the KX2, puts a series R-C combination on each (a few hundred ohms and a microfarad or more, to block the DC), and then ties them together to a mono plug. That should work and keep everyone (the computer and the KX2) happy.

Rich KE1B