[Elecraft] Elecraft Digest, Vol 117, Issue 19 Interfaces for K2

[Dave Barr]

For about a decade or more, I have been using a homebrew interface 
between my K2 and laptop that consists of three wires wrapped together 
and terminating at the mic connection, with transmit audio and ptt to 
the appropriate mic connector pins, and RX audio coming thru an unused 
pin (I think an up down pin or another not usually needed) with a rather 
easy mod involving the internal mic jumper plug, and one short wire to 
an audio source near the audio volume control on the K2.  The only 
additional parts needed are a very simple pull down transistor circuit 
in the ptt circuit and an 600/600 ohm isolation transformer with two rf 
bypass caps, and a simple two resistor transmit audio level pad.  This 
"interface" costs less than $15 and a few hours work.  With this set up, 
I have worked over 260 rtty countries at 5 or fewer watts with my K2 and 
MMTTY, RITTY (by K6STI-no longer supported) and N1MM sofytware. There is 
absolutely no need for any fancy interfaces, but of course you must be 
willing to disconnect your interface from the K2 mic connector if you 
want to work SSB.

73. Dave, K2YG
On 1/14/2014 12:00 PM, elecraft-request at mailman.qth.net wrote:
> Message: 4
> Date: Tue, 14 Jan 2014 09:07:09 -0500
> From: Don Wilhelm<w3fpr at embarqmail.com>
> To: Vince Santis<vinsantis at sbcglobal.net>,elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K2 and Ten Tec  USB digital interface
> Message-ID:<52D5448D.2030406 at embarqmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Vince,
>
> I can't say for certain because there is very little information on the
> website - no schematic or wiring information.
>
> Any interface that provides audio in and out and keying can be made to work.
>
> One thing for certain is that you would have to make an adapter(s) for
> the audio in and out and keying to connect to the K2 mic jack, headphone
> jack and key jack (although PTT could be applied through the mic jack).
>
> 73,
> Don W3FPR
> On 1/14/2014 7:32 AM, Vince Santis wrote:
>> >Can the TT digital interface be used with the K2?
>> >
>> >Thanks,
>> >Vince Santis, N1VS
>> >