[Elecraft] :K2 Homebrew external digital interface with build-in soundcard device

[Don Wilhelm]

Jean,

You might want to take a look at the K2 Digital Interface Box on my 
website www.w3fpr.com for some ideas.
My K2 digital box switches between the microphone and the digital 
interface, so I can use either mode at a flip of a switch.  I have also 
put a fixed audio output circuit in my K2 and route the audio output to 
an unused pin on the mic configuration header so only one cable is 
required between the K2 mic jack and my interface box.

Most any soundcard will work for digital modes (even the computer 
internal card).  The real difference for digital modes is the noise 
level of the soundcard.  Jim Brown K9YC has recently done some testing 
and has recommended a couple of external soundcards.  You might want to 
look at the reflector archives for his posts over the last 4 months.

73,
Don W3FPR

On 1/24/2015 1:23 AM, Behiels jean-Pierre wrote:
>
>
> Hi Elecraft members;
>
> I already have build a K2/10.
> My next project is to homebrew a digital interface for general purpose with
> external soundcard into a separated Elecraft EC2 project enclosure.
> Is there anyone who could give my some addresses and advise witch kind of
> soundcard is usuable for this purpose ?
> I presume a standard PC soundcard is not really useful for build-in in a
> EC2-box without any PC support(connectors and so on)
> You must now that I must solder my DC transceiver PC isolation circuit to
> this soundcard as well.
> I presume I could not solder on a standard PCI slot of sutch soundcard,not
> talking about supplying this unit and so on
> I will work with some small audio transformer,and some opto couplers for the
> DC isolation between both.
> (transceiver and PC USB port).
> I look forward to receive some idees and any good designs and some usefull
> information (addresses where to buy)around.
> I hope someone could help my with my request.
>
>