Re: [Elecraft] [K3] Hum JT65/JT9 and Vox. Resolved.
What's interesting is that all of 60 Hum and it's harmonics are gone. The line out is 2. I have the Mike volume: Balance is all the way over to one channel. Volume in full I adjusted line out to flat top and halved it. The JT65/JT9 display looks good now. -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Revisited-tp7588936p7589325.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: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] [K3] Hum JT65/JT9 and Vox. Resolved.
Thanks Jim & Rick for your help. -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Revisited-tp7588936p7589326.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: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] [K3] Hum JT65/JT9 and Vox. Resolved.
On 5/18/2014 12:42 PM, Larry Lopez wrote: So I set the balance control to kill the "chaff". I then raise the volume in the K3 line out until it flat tops and I back it off by 2. Good method, BUT -- better to drop the level by half the voltage from the "flat top" point. That's because the distortion of many (most?) computer sound cards drops by 10 dB or more at half their maximum output voltage. 73, Jim K9YC __ 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] [K3] Hum JT65/JT9 and Vox. Resolved.
The gain of the sound card (the volume) can be changed by the driver so even if the K3 output doesn't change, the levels can still change. I leave the software (driver) maxed out and the K3 Lin Out at 1 (almost off), but this risks swamping the card AGC so I use the K3 filters to limit what the sound card gets. 73, Rick wa6nhc Tiny iPhone 5 keypad, typos are inevitable > On May 18, 2014, at 12:42 PM, Larry Lopez wrote: > > So I decide to give up and set the audio level right. > So I get the free for private use sound card oscilloscope > http://www.zeitnitz.de/Christian/scope_en. > > I picked this one because it was first when I goggled "sound card > oscilloscope". > > Very nice. > > But gee, there are 2 channels for the mike and a balance control. > One channel has "the signal" one channel has "chaff". > > So I set the balance control to kill the "chaff". > I then raise the volume in the K3 line out until it flat tops > and I back it off by 2. > > next step, get it to sample at 48000. > > obsessive, I am. > > > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Revisited-tp7588936p7589252.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: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 happymooseph...@gmail.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 arch...@mail-archive.com
Re: [Elecraft] [K3] Hum JT65/JT9 and Vox. Resolved.
So I decide to give up and set the audio level right. So I get the free for private use sound card oscilloscope http://www.zeitnitz.de/Christian/scope_en. I picked this one because it was first when I goggled "sound card oscilloscope". Very nice. But gee, there are 2 channels for the mike and a balance control. One channel has "the signal" one channel has "chaff". So I set the balance control to kill the "chaff". I then raise the volume in the K3 line out until it flat tops and I back it off by 2. next step, get it to sample at 48000. obsessive, I am. -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Revisited-tp7588936p7589252.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: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] [K3] Hum JT65/JT9 and Vox. Resolved.
I switched to a Creative Sound Blaster X-Fi Go! USB dongle and that got rid of the hum from the laptop charger. I got this originally because the desktop I use has no sound support at all. It was an extremely cheap server box that runs Linux. -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Resolved-tp7588936p7588949.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: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] [K3] Hum JT65/JT9 and Vox. Resolved.
I was wildly optimistic in this. A second source of "hum" is the switching supply of the laptop. It's similar to the power supply hum. Even though it's clearly a switching supply. Curiosly the laptop need 12 volts. So perhaps I can pick that off of the linear power supply. Or maybe run everything off of a battery. -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-JT65-JT9-and-Vox-Resolved-tp7588936p7588941.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: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
