[Elecraft] Elecraft KX3 Owner's Manual now available

[Don Wilhelm]

Ed,

For digital modes, you must provide audio input to the microphone 
connector - just use a stereo plug and connect the audio to the tip - 
the PTT is on the ring, so you only need 3 plugs, one for the headphone 
jack and one for the microphone jack, and the other for the ACC1 (data) 
jack.

It might prove useful to construct a variation the interface Skip Teller 
KH6TY published in QST for July 2010.  The "variation" is to add wires 
from RXD and TXD (plus Signal Ground) to a 3.5mm stereo plug 
(effectively adding your own version of the KX3SER cable) I believe it 
provides exactly what is needed for the PTT Data mode operation - plug 
it into a real serial port or the K3USB cable (or similar USB to serial 
cable).

At least, that is how I would do it if I wanted everything to be in one 
package.

73,
Don W3FPR

On 3/6/2012 4:01 AM, Edward R. Cole wrote:
> Following this thread with Lance, carefully.  I'm not sure I will run
> eme with my KX3 but will probably run WSJT on the 600m band.  My 600m
> transmitter uses a P&B dc relay for TR so need more delay.  Can I not
> use my K3USB cable and tap out the RTS line (DB9 pin7) to control the
> GPIO line to accomplish PTT with sw control?  Will use of the GPIO
> line require special changes to the firmware to accomplish PTT?
>
> Most soundcard sw utilize RTS for PTT, so this issue is not limited
> to just WSJT.
>
> 73, Ed - KL7UW
> ------------------------------
>
> Message: 14
> Date: Mon, 05 Mar 2012 14:13:32 -0500
> From: Don Wilhelm<w3fpr at embarqmail.com>
> Subject: Re: [Elecraft] Elecraft KX3 Owner's Manual now available
>           (*preliminary*)
> To: w7gj at q.com
> Cc: Elecraft Mailing List<elecraft at mailman.qth.net>
> Message-ID:<4F55105C.6040206 at embarqmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Lance,
>
> You should not need another USB cable, but use the KXSER cable (and a
> USB to serial adapter if needed) which will give you access to the RTS
> and DTR pins of the serial port.
> Yes, you will have to add the wires to the existing KXSER cable.
>
> 73,
> Don W3FPR
>
>
>
>
> 73, Ed - KL7UW, WD2XSH/45
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