[Elecraft] K2 SSB digital modes

[Peter Wollan]

(Brian WB6RQN asks for an easy way to do digital modes on a K2, for  
his Montessori school rig:)

If you have a Mac, the soundcard SSB modes can be done easily.  I use  
CocoaModem.  Receive needs only a stereo cable from the K2, either  
the headphones jack or the aux speaker, to the mic input on the  
computer.  On recent Macs, at least, the mic input is isolated and  
needs no transformer -- just straight stereo plug to stereo plug.   
Vox works very well for transmitting;  it needs a cable with stereo  
plug on the computer end (into the headphones socket) and a voltage  
divider on the K2's mic plug (two resistors soldered into an 8-pin  
plug).   Specifications are on the Elecraft web site, in Builder  
Resources, "PSK31with the K2" by WA7SPY.  Setting the vox level takes  
some fiddling, but just in the computer output volume, not in the  
K2.  If you don't want to use vox, you need more hardware to get the  
PTT line out a USB port.

CocoaModem is exceptionally good software, by Kok Chen, W7AY <http:// 
homepage.mac.com/chen/index.html>.   His CocoaNec is great, too.   
Both are free.  There are a couple of modes that CocoaModem doesn't  
do -- SSTV is available in MacRobot, but some modes just aren't  
available on a mac.

	Peter N8MHD