[Elecraft] KX3 and Data Mode Interface

Sun Mar 18 19:56:39 EDT 2012

All I can echo lance's post. Given my saver antenna restriction, for me, when at home I will be doing digital

As most people rather let the dust settle (the expert voice their experience) so I/we can get the best results

Robert

a 'kosher' ham 
Sent from my BlackBerry device

-----Original Message-----
From: "W7GJ, Lance" <w7gj at q.com>
Sender: elecraft-bounces at mailman.qth.net
Date: Sun, 18 Mar 2012 16:10:37 
To: <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] KX3 and Data Mode Interface

Hi Ed,

I also need the same thing, as I am sure many people do.  I need to figure out a 
solution as small as possible, since my KX3 and whatever additional 
cables/interfaces/6m preamplifier, etc etc. need to all fit in the outside pouch of 
my laptop computer case for airline travel.

Any thoughts would be greatly appreciated.  I would THINK that Elecraft probably 
would provide cables (eventually, anyway) to allow the KX3 to be used on digital 
modes, but maybe it will take some time after the production units are actually going 
out the door.

I would have expected that field testers already would have determined the best way 
to achieve this type of operation, Ed.  So I think it is best to let the dust settle 
first and get their input before rushing off to develop some custom interface that 
may or may not be necessary with the final KX3...

VY 73, Lance

  On 3/18/2012 7:03 PM, Edward R. Cole [via Elecraft] wrote:
> This seems a popular topic on the KX3.
>
> For computer interfacing the KX3 for running various soundcard
> programs a simple interface is needed for PTT, Keying, and transmit
> audio. It is assumed that one side of the IQ baseband will serve for
> connection of Rx audio to the soundcard.
>
> A couple choices are given for PTT:
> 1) using the Mic-PTT
> 2) using GPIO input
>
> Transmit audio from a soundcard will have to be:
> 1) isolated
> 2) reduced in amplitude to drive the mic input properly.
>
> RS232 needs to be isolated from KX3 PTT and KEY.
>
> An external unit is what looks practical and will need the proper connectors:
> 1) Four contact mic connector w/ suitable length cord
> 2) ACC2 connector (if used)
> 3) standard 3.5mm phone jack for soundcard interconnect (get that from RS)
> 4) breakout of serial cable RTS line and DTR line
> 5) connector for KX3 KEY jack.
> 6) transistors to isolate RTS and DTR
> 7) resistive divider (pot) for setting Tx audio level
> 8) miniature pcb isolation transformer for audio
>
> A simple interface can be made "very tiny" using sm components,
> though may be more than will fit the standard DB9 (9-pin subD) jack
> shell. I'm giving some thought to manufacture such an item, but I
> need to receive delivery of my KX3 for development.
>
> What would folks like this to look like? How long should cords be?
>
> 73, Ed
>
> -------------------------
> Date: Sat, 17 Mar 2012 20:29:41 +0100
> From: Frode LA2RL <[hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=0>>
> Subject: [Elecraft] KX3 and Data Mode Interface
> To: [hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=1>
> Message-ID:
> <CADpT02T=Qw5TDWuv=Xev=[hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=2>>
> Content-Type: text/plain; charset=ISO-8859-1
>
> The K3 Manual says clearly that the Line In and Line Out signals are
> isolated with transformers and that these ports therefore can be connected
> directly to a computer sound card.
>
> I have read carefully through the KX3 Preliminary Manual but I have not
> found any information about isolation of the input and output analog
> signals. I therefore suppose that the KX3 does not have any isolation on
> these ports, however on page 18 the manual says that you can connect the
> computer audio to the MIC jack and the KX3 phone jack to the computer's
> audio input. So I am still somewhat confused.
>
> 73
> Frode LA2RL
>
>
>
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ 500 KHz - 10-GHz www.kl7uw.com
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-- 
Lance Collister, W7GJ
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