[Elecraft] [K2]PSK31 QRP?

[Don Wilhelm]

Curt,

Most any interface box will work with the K2 if you use the headphone 
output and mic input - even homebrew.  PTT can be derived from a USB to 
serial adapter and a "one transistor keying" circuit.   Take a look at 
my website www.w3fpr.com for the K2 Fixed Audio Output article and the 
Switchbox for Digital Modes article. It may be possible to use the 
laptop soundcard, but external soundcards are easy to use and inexpensive.

You do not need the Compression Disable part of the switchbox article if 
you turn on RTTY mode and set up the filters just like your SSB 
filters.  With RTTY mode, the compression setting is independent of the 
setting used for SSB  -- Compression must be at 1-1 for data modes.

You can find an updated circuit for the Fixed Audio Output at the newly 
mirrored N0SS website 
http://www2.opparc.org/mirrors/n0ss/www.n0ss.net/wsdindex.html. Boards 
are no longer available, but the circuit is simple enough to construct 
on perfboard.

73,
Don W3FPR

On 11/21/2013 7:49 AM, Curt wrote:
> For some reason I've become interested in trying PSK31 with my K2/10. 
> Receive works well, but haven't tried transmitting yet because my 
> laptop has only USB connectors.  Before buying an interface, would 
> appreciate knowing whether others have had success with QRP level 
> PSK31.  Which interfaces play well with the K2?
>
> 73, Curt KB5JO
>
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