> On Sep 14, 2018, at 9:57 AM, Brad Noblet <[email protected]> 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 ______________________________________________________________ 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]
