KX3 and Data Mode Interface
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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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KX3 and Data Mode Interface
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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 > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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) [hidden email] http://www.hatpinsandmore.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KX3 and Data Mode Interface
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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 <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. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 > <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. > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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) [hidden email] http://www.hatpinsandmore.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by KU7Y
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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KX3 and Data Mode Interface
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In reply to this post by Frode LA2RL
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: <CADpT02T=Qw5TDWuv=Xev=[hidden email]> 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 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 > EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? > DUBUS Magazine USA Rep [hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=3> > "Kits made by KL7UW" http://www.kl7uw.com/kits.htm > ====================================== > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=4> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------------------------------------------------------------- > If you reply to this email, your message will be added to the discussion below: > http://elecraft.365791.n2.nabble.com/KX3-and-Data-Mode-Interface-tp7382234p7383963.html > To start a new topic under Elecraft, email [hidden email] > To unsubscribe from Elecraft, click here > < > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: [hidden email] Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! |
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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" <[hidden email]> Sender: [hidden email] Date: Sun, 18 Mar 2012 16:10:37 To: <[hidden email]> 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 > EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? > DUBUS Magazine USA Rep [hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=3> > "Kits made by KL7UW" http://www.kl7uw.com/kits.htm > ====================================== > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] </user/SendEmail.jtp?type=node&node=7383963&i=4> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------------------------------------------------------------- > If you reply to this email, your message will be added to the discussion below: > http://elecraft.365791.n2.nabble.com/KX3-and-Data-Mode-Interface-tp7382234p7383963.html > To start a new topic under Elecraft, email [hidden email] > To unsubscribe from Elecraft, click here > < > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: [hidden email] Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-and-Data-Mode-Interface-tp7382234p7384318.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by W7GJ, Lance
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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