Re: [Elecraft] KX3 and Data Mode Interface

[ik1bxn]

Hi guys!I think I will use the interface I built for ft817 by modifying
cabling. It comes from G4ILO (thanks a lot Julian) and I added a couple of
insulation transformers 600/600 Ohm.It works fine and it's really cheap as
for Usb soundcard I payed 5 $. This way I have a Vox actuated PTT and I
leave the notebook (a MacBook in my case) internal soundcard to its job. In
addition by pressing buttons on the card I can regulate volume without
opening any window.
No problem for driver as system uses it immediately without any answer even
in OSx or in Win7 virtualized there.
You can find this interface here :http://www.g4ilo.com/usblink.html
73 de Giorgio IK1BXN

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Re: [Elecraft] KX3 and Data Mode Interface

[va3bxg]

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" 
Sender: elecraft-boun...@mailman.qth.net
Date: Sun, 18 Mar 2012 16:10:37 
To: 
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] 
> >
> Subject: [Elecraft] KX3 and Data Mode Interface
> To: [hidden email] 
> Message-ID:
>  >
> 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
> EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
> DUBUS Magazine USA Rep [hidden email] 
> 
> "Kits made by KL7UW" http://www.kl7uw.com/kits.htm
> ==
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> ml-node+s365791n365791...@n2.nabble

Re: [Elecraft] KX3 and Data Mode Interface

[W7GJ, Lance]

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] 
> >
> Subject: [Elecraft] KX3 and Data Mode Interface
> To: [hidden email] 
> Message-ID:
>  >
> 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
> EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
> DUBUS Magazine USA Rep [hidden email] 
> 
> "Kits made by KL7UW" http://www.kl7uw.com/kits.htm
> ==
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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Re: [Elecraft] KX3 and Data Mode Interface

[Edward R. Cole]

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 
Subject: [Elecraft] KX3 and Data Mode Interface
To: Elecraft@mailman.qth.net
Message-ID:
 
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
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep dubus...@gmail.com
"Kits made by KL7UW" http://www.kl7uw.com/kits.htm
==
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Re: [Elecraft] KX3 and Data Mode Interface

[Jim Brown]

On 3/17/2012 2:37 PM, KU7Y wrote:
> Those little 1:1 audio isolation transformers come in several flavors
> 600 Ohm and 10K Ohm if memory serves me right.

No transformer is needed if simple chassis-to-chassis bonding is done 
between computer and rig.  I am finding though that a good USB audio 
interface can improve decoding capability, and that would be a better 
use of money than a transformer.  I posted a couple of suggestions last 
week, and W0YK came up with another good one.

73, Jim K9YC
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Re: [Elecraft] KX3 and Data Mode Interface

[KU7Y]

I should have mentioned in my last post that I have not used one of these 
transformers yet.

I just connected the audio out on the FT-1000 MP right to the sound card in 
the computer.  That was to give a RTTY contest a try.  There was no 
problems, so I guess my grounding was working OK.

But I have them "just in case"!  :-)

OK, back in my hole,

Ron, KU7Y
SOWP 5545M
Arizona Outlaws Contest Club
Brenda, AZ (Winter)
Caldwell, ID (Summer)
k...@qsl.net
http://www.hatpinsandmore.com 

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Re: [Elecraft] KX3 and Data Mode Interface

[Greg]

It will.  I ordered those transformers from digikey ($17 each) and built 
my own soldered directly to the cables.  Works very well.

73
Greg
AB7R


On 3/17/2012 2:59 PM, Jussi Eloranta wrote:
> On 03/17/2012 02:37 PM, KU7Y wrote:
>> Those little 1:1 audio isolation transformers come in several flavors
>> 600 Ohm and 10K Ohm if memory serves me right.
>>
>> Which would be needed if we had to resort to using them?
>>
>> OK, back in my hole,
>>
> I wonder if the following would do?
>
> http://www.rfsystem.it/shop/product_info.php?products_id=43&osCsid=ef8d5ca5252b53e3b2b103b8b75d942c
> 
>
> It appears to be 600 ohm to 600 ohm with a frequency response up to 100 kHz.
>
> Jussi Eloranta
>
> ps. I have not tried the above - I am actually looking for a suitable
> solution as well.
>
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Re: [Elecraft] KX3 and Data Mode Interface

[Jussi Eloranta]

On 03/17/2012 02:37 PM, KU7Y wrote:
> Those little 1:1 audio isolation transformers come in several flavors
> 600 Ohm and 10K Ohm if memory serves me right.
>
> Which would be needed if we had to resort to using them?
>
> OK, back in my hole,
>
I wonder if the following would do?

http://www.rfsystem.it/shop/product_info.php?products_id=43&osCsid=ef8d5ca5252b53e3b2b103b8b75d942c
 


It appears to be 600 ohm to 600 ohm with a frequency response up to 100 kHz.

Jussi Eloranta

ps. I have not tried the above - I am actually looking for a suitable 
solution as well.

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Re: [Elecraft] KX3 and Data Mode Interface

[KU7Y]

Those little 1:1 audio isolation transformers come in several flavors 
600 Ohm and 10K Ohm if memory serves me right.

Which would be needed if we had to resort to using them?

OK, back in my hole,

Ron, KU7Y
SOWP 5545M
Arizona Outlaws Contest Club
Brenda, AZ (Winter)
Caldwell, ID (Summer)
k...@qsl.net
http://www.hatpinsandmore.com 

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Re: [Elecraft] KX3 and Data Mode Interface

[Frode LA2RL]

Don,

Many thanks for the quick reply. I think I will play safe and get an
interface box from the very beginning. I also suspected that there would be
no room for isolation transformers in the KX3. It is nevertheless amazing
what the box contains. I am looking forward to play with this beauty.

73,
Frode LA2RL
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Re: [Elecraft] KX3 and Data Mode Interface

[Don Wilhelm]

Frode,

The KX3 does not contain isolation transformers - there is not adequate 
room inside.
Yes, you may connect to the mic and phone jacks directly, and that can 
sometimes be done if the computer and the KX3 are properly bonded 
together (see K9YC's papers).  If the bonding does not cure hum and 
noise pickup, you will probably have to add isolation transformers 
outside the KX3 (or use an interface box).

73,
Don W3FPR

On 3/17/2012 3:29 PM, Frode LA2RL wrote:
> 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
>
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[Elecraft] KX3 and Data Mode Interface

[Frode LA2RL]

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
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