S6 noise floor?
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Aside from installing ferrite on all cables (not sure why this isn't
integrated somehow if it's that large of an issue) would having the shack walls lined with a grounded screen help reduce/eliminate radio noise? Is the cost/effort worth it? My wife and I are planning to build a house in a few years and I'm planning out my station. Based on the noise issues I have and have researched it sounds like I need a shielded room where all cables in/out are wrapped in ferrite and power is routed through a 1:1 transformer OR true sine wave UPS. Then I still have to deal with computer equipment noise and anything else to get a clean signal where the ground noise is low. Jerry Moore Cell: 803-431-1870 ______________________________________________________________ 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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Hi Jerry
Maybe. You will have to do every piece of copper cable since everyone one of these have the ability to be an antenna. Any switching power supply in your shack would also require choking. I just spent an entire day on Saturday looking for noise up into VHF. It was the wall wart for an outside web cam. I've invested a lot in my hobby. A few hundred dollars on chokes have made it more enjoyable. Mike va3mw On Wed, Feb 26, 2020 at 8:17 AM <[hidden email]> wrote: > Aside from installing ferrite on all cables (not sure why this isn't > integrated somehow if it's that large of an issue) would having the shack > walls lined with a grounded screen help reduce/eliminate radio noise? > > Is the cost/effort worth it? > > My wife and I are planning to build a house in a few years and I'm planning > out my station. > > Based on the noise issues I have and have researched it sounds like I need > a > shielded room where all cables in/out are wrapped in ferrite and power is > routed through a 1:1 transformer OR true sine wave UPS. > > Then I still have to deal with computer equipment noise and anything else > to > get a clean signal where the ground noise is low. > > > > Jerry Moore > > Cell: 803-431-1870 > > > > ______________________________________________________________ > 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] > 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 ae4pb
For this to work, you would have to also put your antenna inside this
RF proof room but then you might not work many stations. John KK9A AE4PB wrote: Aside from installing ferrite on all cables (not sure why this isn't integrated somehow if it's that large of an issue) would having the shack walls lined with a grounded screen help reduce/eliminate radio noise? Is the cost/effort worth it? My wife and I are planning to build a house in a few years and I'm planning out my station. Based on the noise issues I have and have researched it sounds like I need a shielded room where all cables in/out are wrapped in ferrite and power is routed through a 1:1 transformer OR true sine wave UPS. Then I still have to deal with computer equipment noise and anything else to get a clean signal where the ground noise is low. Jerry Moore Cell: 803-431-1870 ______________________________________________________________ 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 ae4pb
Hi,
Start with Jim's, (K9YC), pages, at: http://www.k9yc.com/publish.htm Read most of them, (the titles will direct you), then you will have a far better idea of how to reduce RFI without a shielded room... After that look at: https://www.nk7z.net/rfi-now-house-cleaning/ I cleaned up my shack, with very good results... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/26/20 5:14 AM, [hidden email] wrote: > Aside from installing ferrite on all cables (not sure why this isn't > integrated somehow if it's that large of an issue) would having the shack > walls lined with a grounded screen help reduce/eliminate radio noise? > > Is the cost/effort worth it? > > My wife and I are planning to build a house in a few years and I'm planning > out my station. > > Based on the noise issues I have and have researched it sounds like I need a > shielded room where all cables in/out are wrapped in ferrite and power is > routed through a 1:1 transformer OR true sine wave UPS. > > Then I still have to deal with computer equipment noise and anything else to > get a clean signal where the ground noise is low. > > > > Jerry Moore > > Cell: 803-431-1870 > > > > ______________________________________________________________ > 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] > 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 ae4pb
Hi Jerry.
The first thing to check, is if the "noise" is from your own stuff, or outside you immediate control. You can do that easily, by running the rig from batteries (internal or external) and turning the house off at the main incoming switch. If the noise level drop's significantly, then you're in with a fighting chance of tracking down the source(s). Go arround unplugging/turning off "Everything" you can find. Note the noise level, then turn one at a time back on, and see what is the main source. Don't forget anything that is not on a plug-lead. If there is no change when you turn your house off, then it's something outside. A screened room won't help, as of course your antennas need to be out in the open. You might want to take a radio and antenna /P to wherever you are thinking of building a new house, and do a background RFI survey, before you commit yourself.. 73. Dave G0WBX. On 26/02/2020 16:04, [hidden email] wrote: > Subject: [Elecraft] S6 noise floor? > Message-ID: <015a01d5eca6$ade59c10$09b0d430$@carolinaheli.com> > Content-Type: text/plain; charset="US-ASCII" > > Aside from installing ferrite on all cables (not sure why this isn't > integrated somehow if it's that large of an issue) would having the shack > walls lined with a grounded screen help reduce/eliminate radio noise? > > Is the cost/effort worth it? > > My wife and I are planning to build a house in a few years and I'm planning > out my station. > > Based on the noise issues I have and have researched it sounds like I need a > shielded room where all cables in/out are wrapped in ferrite and power is > routed through a 1:1 transformer OR true sine wave UPS. > > Then I still have to deal with computer equipment noise and anything else to > get a clean signal where the ground noise is low. > > > > Jerry Moore -- Created on and sent from a Unix like PC running and using free and open source software: ______________________________________________________________ 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 ae4pb
During my employed life, I worked on classified projects for the
military and we often worked in SCIF's [shielded rooms] to keep the computer emissions confined. Double doors with phosphor bronze fingers on each, copper shielding in the walls, floor, and ceiling, etc. Generally speaking, a test radio was pretty much silent inside on any frequency. However, all of the noise I see on my P3 and hear comes in on the antenna coax. If it is disconnected from the K3, I hear only circuit hiss. I doubt shielding your shack will be worth the cost and effort. You can't beat K9YC's dissertation on chokes [ http://audiosystemsgroup.com/RFI-Ham.pdf] and proper choking and bonding WILL have a profound effect on common mode noise. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 2/26/2020 5:14 AM, [hidden email] wrote: > Aside from installing ferrite on all cables (not sure why this isn't > integrated somehow if it's that large of an issue) would having the shack > walls lined with a grounded screen help reduce/eliminate radio noise? > > Is the cost/effort worth it? > > My wife and I are planning to build a house in a few years and I'm planning > out my station. > > Based on the noise issues I have and have researched it sounds like I need a > shielded room where all cables in/out are wrapped in ferrite and power is > routed through a 1:1 transformer OR true sine wave UPS. > > Then I still have to deal with computer equipment noise and anything else to > get a clean signal where the ground noise is low. > > > > Jerry Moore > > Cell: 803-431-1870 > ______________________________________________________________ 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 ae4pb
As others have noted, ferrites will help attenuate RFI ** IF ** you own the
offending source and can choke it for radiation or choke your own wiring against common-mode pickup. However, I find that RFI generators over which I have no control are the predominant sources at my QTH after all the local offenders are quenched, e.g. arcs on tie wires or transformer connections in the electricity distribution wiring in my neighborhood and beyond, and RF egress from defected coax sheaths in the cable distribution network. Interestingly, the local power company RFI hunter told me that he works hand in glove with the cable companies because the cable customers report TV, internet and telephone interference that is traced to power line arc generators making ingress to the cable network - both utilities find the weak points in their respective systems. Mike, K8CN -- 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] |
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In reply to this post by ae4pb
On 2/26/2020 5:14 AM, [hidden email] wrote:
> Aside from installing ferrite on all cables (not sure why this isn't > integrated somehow if it's that large of an issue) would having the shack > walls lined with a grounded screen help reduce/eliminate radio noise? > > Is the cost/effort worth it? Of course not. RFI is received by ANTENNAS, not wiring in the station. The things that ARE important are 1) proper bonding of all equipment in the station; 2) bonding of the station to all grounds in the home; 3) elimination of all noise sources in your home, and 4) application of effective ferrite chokes to those sources you can't elimnate. http://k9yc.com/KillingReceiveNoise.pdf http://k9yc.com/GroundingAndAudio.pdf 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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In reply to this post by Elecraft mailing list
I have a handy flow chart for RFI location at:
https://www.nk7z.net/i-have-rfi-now-what-locating-it/ This may help... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/26/20 8:54 AM, Dave B via Elecraft wrote: > Hi Jerry. > > The first thing to check, is if the "noise" is from your own stuff, or > outside you immediate control. > > You can do that easily, by running the rig from batteries (internal or > external) and turning the house off at the main incoming switch. > > If the noise level drop's significantly, then you're in with a fighting > chance of tracking down the source(s). Go arround unplugging/turning > off "Everything" you can find. > > Note the noise level, then turn one at a time back on, and see what is > the main source. > > Don't forget anything that is not on a plug-lead. > > If there is no change when you turn your house off, then it's something > outside. A screened room won't help, as of course your antennas need to > be out in the open. > > You might want to take a radio and antenna /P to wherever you are > thinking of building a new house, and do a background RFI survey, before > you commit yourself.. > > 73. > > Dave G0WBX. > > On 26/02/2020 16:04, [hidden email] wrote: >> Subject: [Elecraft] S6 noise floor? >> Message-ID: <015a01d5eca6$ade59c10$09b0d430$@carolinaheli.com> >> Content-Type: text/plain; charset="US-ASCII" >> >> Aside from installing ferrite on all cables (not sure why this isn't >> integrated somehow if it's that large of an issue) would having the shack >> walls lined with a grounded screen help reduce/eliminate radio noise? >> >> Is the cost/effort worth it? >> >> My wife and I are planning to build a house in a few years and I'm planning >> out my station. >> >> Based on the noise issues I have and have researched it sounds like I need a >> shielded room where all cables in/out are wrapped in ferrite and power is >> routed through a 1:1 transformer OR true sine wave UPS. >> >> Then I still have to deal with computer equipment noise and anything else to >> get a clean signal where the ground noise is low. >> >> >> >> Jerry Moore > 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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