[Elecraft] Digital Mode Interface for the KX3 for WSJT modes

[Gary K9GS]

Or just buy one of these:

http://www.unifiedmicro.com/sci6.htm

Hard to beat for $25.00.

BTW....I have a brand new one for sale, already assembled, never used.  
Will sell for $20.00 including shipping to the lower 48 states.  Note 
this is NOT set up for the KX3...strictly stock using the supplied 
connectors/cables.




On 7/12/2012 7:50 PM, Edward R. Cole wrote:
> Don,
>
> After making several sound-card interfaces (never have used a
> commercially made one),  I deduced the "surest way" to avoid audio
> problems was by total isolation of computer ground and radio
> ground.  East to accomplish using isolation transformers for audio
> and opto-isolators for dc controls.
>
> I guess there are applications for a "VOX-like" PTT control, but I
> use RTL or DTR lines for this with the sw I run.  Opto-isolator like
> the 4N36 work well in this path.
>
> I am going to go ahead making up an I/F with tiny pcb transformers,
> but probably not try installing all inside a sub-D
> connector  (commonly called DB-9 or DB-25).  I will use a tiny
> plastic box and small pc board with mini-phone connectors for audio
> and DB-9 for RS-232 interface.  I have in mind that it will attach on
> the back of the KX3 with a velcro-patch (so one can remove it at will).
>
> I am just stacked up at present so this will not be worked on
> right-away (assuming Lance has one for his eme dxpedition).
>
> I am writing a power-point presentation to demo the KX3 this
> weekend.  I'll add it to my website afterward.
>
> 73, Ed - KL7UW
>
> At 02:49 PM 7/12/2012, Don Wilhelm wrote:
>> Thanks, yes that is the one that produces the PTT from the audio stream.
>> I note that Skip no longer has kits and boards, but he has supplied
>> a complete parts list and the circuit is simple enough to wire on
>> perfboard.  The photos provide a nice layout guide.
>>
>> Contrary to K9YC's statements, I believe the transformers are
>> necessary for use with a laptop.
>> Jim's "bond everything together" is a great solution (and it works)
>> for the home station using a desktop computer, but bonding the
>> computer becomes more difficult when using laptops with all plastic
>> cases.  I cannot find a good place to connect to the computer ground
>> of my IBM Thinkpad.unless it just happens to be the jackscrews on
>> the VGA connector - but those are there to prevent connector
>> pullout, and may or may not be grounded.  (I use a desktop at the
>> home station).
>>
>> 73,
>> Don W3FPR
>
> 73, Ed - KL7UW, WD2XSH/45
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-- 


73,

Gary K9GS

Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
CW Ops #1032   http://www.cwops.org

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