SNR improvement on CW signals
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SNR improvement on CW signals
 
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Hi all,
there is an interesting article about the improving perceived loudness by 6dB and that of the background noise by 3dB, resulting in a net 3dB improvement in the signal's SNR on CW... https://plus.google.com/100312042524727617304/posts/gtNciqaFQk5 BTW: be careful as there are a little mistakes in frequencies difference for fourth chord etc. 1) CQ Jan 18, page 17, Fig.1. (b): 697Hz-523Hz=174Hz (almost fourth chord) and NOT 80Hz as described 2) CQ Jan 18, page 18, Tab.1: eg. E4-F4=19.6Hz NOT 19.55Hz, F#/Gb-F5=41.533Hz NOT 42.53Hz etc. Is there somebody who configured his K3 for that and tested it already? 73 - Petr, OK1RP ----- http://ok1rp.blogspot.com -- Sent from: http://elecraft.365791.n2.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 lists+1215531472858-365791@n2.nabble.com
73 - Petr, OK1RP
"Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt |
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Taking the headphones off and laying them on the desk seems to boost the
SNR of a CW signal significantly. Helps with closely spaced QRM too. It's been known to RO's since the "olden days." 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 1/12/2018 2:13 AM, Petr, OK1RP/M0SIS wrote: > Hi all, > > there is an interesting article about the improving perceived loudness by > 6dB and that of the background noise by 3dB, resulting in a net 3dB > improvement in the signal's SNR on CW... > > https://plus.google.com/100312042524727617304/posts/gtNciqaFQk5 > > BTW: be careful as there are a little mistakes in frequencies difference for > fourth chord etc. > 1) CQ Jan 18, page 17, Fig.1. (b): 697Hz-523Hz=174Hz (almost fourth chord) > and NOT 80Hz as described > 2) CQ Jan 18, page 18, Tab.1: eg. E4-F4=19.6Hz NOT 19.55Hz, > F#/Gb-F5=41.533Hz NOT 42.53Hz etc. > > Is there somebody who configured his K3 for that and tested it already? > > 73 - Petr, OK1RP > > > > > ----- > http://ok1rp.blogspot.com > -- > Sent from: http://elecraft.365791.n2.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 > Message delivered to [hidden email] > > > -- > This message has been scanned by E.F.A. Project and is believed to be clean. > > > ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by Petr, OK1RP/M0SIS
I want to setup an audio mixer facility so that I can have at least on
stereo headphone output and/or a stereo speaker output. That's the easy end. :-) I want to feed it with inputs from the K3S, IC7100, SDR output from a PC and possibly a Wouxun multi-band VHF. So a device with at least 4 stereo inputs and appropriate level controls. Has anyone else done this and can recommend a unit that's as RF proof as possible. I'm not averse to using a few ferrites, but the system has to be clean with 400W HF near it, as I need to listen to the SDR whilst transmitting. Thoughts on how to connect it would also be appreciated, bearing in mind that AFAICR the Wouxun only has a low impedance speaker outlet and all others must be stereo. 73, Alan. G4GNX ______________________________________________________________ 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 Message delivered to [hidden email] |
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Alan
I will be installing a Rolls MX28 mixer today for monitoring SO2R with a second Rx - a JRC NRD 525. Ill let the group know how it goes Russ KD4JO Sent from my T-Mobile 4G LTE Device -------- Original message -------- From: G4GNX <[hidden email]> Date: 1/13/18 7:20 AM (GMT-05:00) To: [hidden email] Subject: [Elecraft] Mixer for audio I want to setup an audio mixer facility so that I can have at least on stereo headphone output and/or a stereo speaker output. That's the easy end. :-) I want to feed it with inputs from the K3S, IC7100, SDR output from a PC and possibly a Wouxun multi-band VHF. So a device with at least 4 stereo inputs and appropriate level controls. Has anyone else done this and can recommend a unit that's as RF proof as possible. I'm not averse to using a few ferrites, but the system has to be clean with 400W HF near it, as I need to listen to the SDR whilst transmitting. Thoughts on how to connect it would also be appreciated, bearing in mind that AFAICR the Wouxun only has a low impedance speaker outlet and all others must be stereo. 73, Alan. G4GNX ______________________________________________________________ Elecraft mailing list Home: https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Cfc3add58b9694da7e13c08d55a7ffaa3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514428063145584&sdata=A%2BKLQIOXvuq%2BDSD5a731yqRXFCOONMnLwPx8OGmuqKk%3D&reserved=0 Help: https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7Cfc3add58b9694da7e13c08d55a7ffaa3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514428063145584&sdata=SVAzlM6SF7OLHK2vr%2F79QGp8wbQEstHcIIQ5xo6QYww%3D&reserved=0 Post: mailto:[hidden email] This list hosted by: https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net&data=02%7C01%7C%7Cfc3add58b9694da7e13c08d55a7ffaa3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514428063145584&sdata=cN1gNs4hB7qrT7rYrp8YYBIWU9l3CVrZ%2BnODttWZ%2Fu0%3D&reserved=0 Please help support this email list: https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=02%7C01%7C%7Cfc3add58b9694da7e13c08d55a7ffaa3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514428063145584&sdata=63%2BgmxLmdACkMx8W0Irs%2BiJUxaDLsPQKaAP4IY%2BMO38%3D&reserved=0 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by Alan - G4GNX
On 1/13/2018 4:19 AM, G4GNX wrote:
> Has anyone else done this and can recommend a unit that's as RF proof > as possible. I would start with any model of Rane or Mackie manufactured AFTER about 1998. That's around the time that both companies acknowledged their Pin One Problems and corrected them. I'm recommending these companies because their products don't have this problem. Most other products DO. 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 Message delivered to [hidden email] |
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All:
I did some testing with a $75 Rolls MX-28 three channel stereo mixer yesterday. Here are my thoughts using it to split the audio from my K3 and JRC NRD 525 for SO2R monitoring: You get what you pay for - At 100W, there is no RFI evident At 1500Wm I needed to add a number of #31 mix beads on the Power & audio I/O's to choke out RFI which manifested itself as a hum/buzz on CW and modulated junk on SSB. The pots @ full CCW are not infinite attenuation That being said - with the proper RF choking, the little mixer is OK for monitor use, but I would not put it in the airchain. For my airchain, I use a AirCorp 500 PH Pro Announcer Mike Processor which, as a pro device, has internal RFI mitigation. Most processors used for broadcast have this LF RFI mitigation so they can be used at a co-located AT tx/studio site. Russ KD4JO ________________________________ From: [hidden email] <[hidden email]> on behalf of Jim Brown <[hidden email]> Sent: Saturday, January 13, 2018 12:29 PM To: [hidden email] Subject: Re: [Elecraft] Mixer for audio On 1/13/2018 4:19 AM, G4GNX wrote: > Has anyone else done this and can recommend a unit that's as RF proof > as possible. I would start with any model of Rane or Mackie manufactured AFTER about 1998. That's around the time that both companies acknowledged their Pin One Problems and corrected them. I'm recommending these companies because their products don't have this problem. Most other products DO. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7C9d79ba621496409fadda08d55aab496f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514614066907921&sdata=soZ8bd37020B3AX9Je14DxeCto7n%2FGjm0huxFtpOa2c%3D&reserved=0 Help: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7C9d79ba621496409fadda08d55aab496f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514614066907921&sdata=DyLCMPidy5qvJUG6uyto19MuWMv1zc7ZaLDHh3eIIQs%3D&reserved=0 Post: mailto:[hidden email] This list hosted by: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net&data=02%7C01%7C%7C9d79ba621496409fadda08d55aab496f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514614066907921&sdata=YGbUUWR6zrDRctRdbZnwAW81%2BdNOKk1HwQlvaP08vII%3D&reserved=0 Please help support this email list: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=02%7C01%7C%7C9d79ba621496409fadda08d55aab496f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636514614066907921&sdata=FRIutySs4MV3ufkWSPAqn2HzydioDO5oO6xEq78TWM8%3D&reserved=0 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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