Re: [Elecraft] KX3 to computer connection.
Several thoughts. There's a detailed tutorial on setting audio levels for digital modes at http://k9yc.com/USB_Interfaces.pdf It also includes advice about making suitable attenuators. I've found adapters on amazon to split a TRRS jack into mic in and line out connectors. I seem to recall the brand was Star. They're pretty light weight, and I haven't used them (wanted them for the ready box), so I have no idea how well they will hold up. But they're cheap enough to buy two. :) Based on my testing, that good, low cost Numark listed is a very good unit for our purposes, and can significantly improve decoding as compared to internal sound cards. BTW -- the noise you describe is often caused by failure to bond the computer to the radio. 73, Jim K9YC On Wed,4/5/2017 10:02 AM, Dave B via Elecraft wrote: Run the PC's output at a relatively high level, but not into distortion (test with headphones, so as to swamp any spurious PC related noises.) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 to computer connection.
On 05/04/17 17:08, David Deitrick wrote: > I have a KX3, the KX3-PCKT Cable set and a computer that does not have > separate mic & headphone jacks, but a single combination jack for both mic & > phones. Any hints as to how to connect the mic & phone cables from the KX3 to > the computer? > > Thanks > > Dave > KB8XG > dhdeitr...@mac.com Hi. Take care with the levels... The I/Q output from the KX3 is a stereo feed at "Line" level. (But is still useful as a mono feed at times, especially if you want the speaker to be active too, else you'll need to make a "Y" cable from the phones jack, to serve both the PC's input, and an external speaker or phones.) The 'phones' output from the KX3 is even higher level, and is also a stereo feed. The "Mic" input of a PC is very low level. So, you'll need at least a simple two resistor attenuator between rig and PC, so as not to overload the PC, and keep the RX noise level down (as seen by the PC) I use a rough value of some 20 to 30dB, depending what parts I have about. The source impedance of the KX3 is fairly low (Ohms) and the load impedance of the PC will be fairly high (kOhms) making the needed calculations easier. Similarly, the 'headphone' output from the PC will be a fairly high level, while the Mic input to the KX3 again is a very low level, so again you'll need a simple resistive attenuator between the two. And again, the PC output is a LowZ and the input to the KX3 is a High(ish)Z, again, simple calculations. Also turn OFF the Mic Bias option in the KX3 menu. Just make sure the resistor values used swamp the actual source and load impedances, this is audio frequency signals, so no need to "match" the source to the cable to the load etc. Run the PC's output at a relatively high level, but not into distortion (test with headphones, so as to swamp any spurious PC related noises.) Use the rig's mic gain control to get an ALC level of 4 bars, with the 5th flickering when transmitting, and use the RF Power control to set the TX power level. (Use "Data A" mode, so the rig turns off any TX EQ you may have set for your voice.) If you find you have to have a very low mic gain, and it's a very coarse adjustment, then you need more attenuation between the PC and Radio. Turning down the PC's output level can help, but then any spurious noises become significant elsewhere in the audio passband, hence it's best to run the PC at a high(ish) level, and attenuate it all down to suit the mic input, but in a way that gives you decent and fine control of the mic gain. Likewise, you should see a more or less flat frequency response in your digimode (or whatever) software when just RX noise is present. Similarly, if you find you have the PC's mic gain set very low, AND the Radio's output (volume) set low, you need more attenuation between radio and PC. A request please. Check your PC is not set to make bings and burp etc noises by default from the internal sound card if that is what you use.Most external (USB type) sound cards are "quieter" (noise wise) than most PC internal cards, and also allow you to keep whatever OS related noises you want on the internal system, keeping them away from the radio. It takes a little juggling of levels etc, but you can get a very good results this way. 73. Dave G0WBX. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 to computer connection
I use this one. Chep. But it works.https://smile.amazon.com/Splitter-Earphone-separate-headphone-microphone/dp/B01J9RXQKK/ref=sr_1_20?ie=UTF8&qid=1491356475&sr=8-20&keywords=trrs+male++to+trs+female+splitter 73Gil, W1RG From: David Deitrick To: elecraft@mailman.qth.net Sent: Tuesday, April 4, 2017 9:06 PM Subject: [Elecraft] KX3 to computer connection I have a KX3, the KX3-PCKT Cable set and a computer that does not have separate mic & headphone jacks, but a single combination jack for both mic & phones. Any hints as to how to connect the mic & phone cables from the KX3 to the computer? Thanks Dave KB8XG dhdeitr...@mac.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmoo...@bellsouth.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 to computer connection
Not a recommendation... never used one, but I think that is what these types of adapters are used for. Somewhat popular for cell phones. https://www.amazon.com/FolioGadgets-Headphone-Splitter-Separate-Microphone/dp/B01LRXI668/ref=sr_1_5?ie=UTF8&qid=1491356396&sr=8-5&keywords=microphone+to+headphone+adapter On Tue, Apr 4, 2017 at 9:06 PM, David Deitrick wrote: > I have a KX3, the KX3-PCKT Cable set and a computer that does not have > separate mic & headphone jacks, but a single combination jack for both mic > & phones. Any hints as to how to connect the mic & phone cables from the > KX3 to the computer? > > Thanks > > Dave > KB8XG > dhdeitr...@mac.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ke...@k4vd.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 to computer connection
Would this work, I wonder? https://www.amazon.com/slp/headphone-mic-splitter/ceuun2nq7wpk4e9 On Tue, Apr 4, 2017 at 9:06 PM, David Deitrick wrote: > I have a KX3, the KX3-PCKT Cable set and a computer that does not have > separate mic & headphone jacks, but a single combination jack for both mic > & phones. Any hints as to how to connect the mic & phone cables from the > KX3 to the computer? > > Thanks > > Dave > KB8XG > dhdeitr...@mac.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to r...@wc3t.us > -- 73 (or 72 for the QRP folks), Rich Hurd / WC3T Northampton County RACES EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 Grid: *FN20is* 40°45.68' N 75°17.33' W __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
