[Elecraft] K3 / SLUSB / CocoaModem

[Bill Frantz]

On 12/11/12 at 9:14 PM, k6limaecho at gmail.com (Rick Prather) wrote:

>Not sure why you feel the need for the SL [SignaLink] with your K3 but that's up to you.

The MacBook Air has only a single audio port. The Apple web site 
is a bit light on technical information (no surprise there), but 
it says the MacBook Air includes:

   Headphone port
   Support for Apple iPhone headset with remote and microphone

If indeed it will take a 4 conductor plug (with a tip, 2 rings, 
and a sleeve), then it may be possible to skip the SignaLink by 
wiring a plug correctly. A friend who has done so for connecting 
a iPhone to a wired phone system says that the resistance value 
of the microphone connection is what is used to determine 
whether the plug is a 3 conductor stereo plug or a 4 conductor 
stereo + microphone plug.

In any case, having the SignaLink lets you use the cocoaModem 
"monitor" feature to listen to the incoming signal. Not a great 
advantage with the K3 since you can just turn up the audio 
volume on the K3, but sometimes useful to hear what the computer hears.

Cheers - Bill, AE6JV

---------------------------------------------------------------------------
Bill Frantz        |"We used to quip that "password" is the most common
408-356-8506       | password. Now it's 'password1.' Who said 
users haven't
www.pwpconsult.com | learned anything about security?" -- Bruce Schneier