OT Apple Airport Extreme RFI
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Just replaced an older circa 2012 Apple Time Capsule with a new Airport Extreme in my home gigabit network. And in the category of “it’s always something,” I discover that the AEX powers down with my K3S/KPA500 at 500 watts. Just shits off. Admittedly, they sit just feet away from each other, but care is taken to separate RF lines from audio lines and network lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses?
David A., KK6DA, LA David Ahrendts [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] |
Re: OT Apple Airport Extreme RFI
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I have the same problem, 50-100 watts would shut mine down. Never did solve
it, but have only been operating QRP since a recent move. Jim KA2RVO On Sun, Feb 28, 2016 at 1:24 PM, David Ahrendts <[hidden email]> wrote: > Just replaced an older circa 2012 Apple Time Capsule with a new Airport > Extreme in my home gigabit network. And in the category of “it’s always > something,” I discover that the AEX powers down with my K3S/KPA500 at 500 > watts. Just shits off. Admittedly, they sit just feet away from each > other, but care is taken to separate RF lines from audio lines and network > lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? > > David A., KK6DA, LA > > > David Ahrendts [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] 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] |
Re: OT Apple Airport Extreme RFI
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James,
I have an Airport Extreme, with no issues. Mine is plugged into a separate AC power outlet through a filter/surge protector. Also I have the Airport Extreme power lead looped through a snap-on ferrite core. You might want to review Jim Brown’s (K9YC) tutorial on RFI: http://www.k9yc.com/RFI-Ham.pdf 73, Bob Nobis - N7RJN [hidden email] > On Feb 28, 2016, at 12:38, James Austin <[hidden email]> wrote: > > I have the same problem, 50-100 watts would shut mine down. Never did solve > it, but have only been operating QRP since a recent move. > > Jim KA2RVO > > On Sun, Feb 28, 2016 at 1:24 PM, David Ahrendts <[hidden email]> > wrote: > >> Just replaced an older circa 2012 Apple Time Capsule with a new Airport >> Extreme in my home gigabit network. And in the category of “it’s always >> something,” I discover that the AEX powers down with my K3S/KPA500 at 500 >> watts. Just shits off. Admittedly, they sit just feet away from each >> other, but care is taken to separate RF lines from audio lines and network >> lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? >> >> David A., KK6DA, LA >> >> >> David Ahrendts [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] > ______________________________________________________________ > 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 James Austin
I have one but only use the wifi network... No issues with RFI.
On Sunday, February 28, 2016, James Austin <[hidden email]> wrote: > I have the same problem, 50-100 watts would shut mine down. Never did solve > it, but have only been operating QRP since a recent move. > > Jim KA2RVO > > On Sun, Feb 28, 2016 at 1:24 PM, David Ahrendts <[hidden email] > <javascript:;>> > wrote: > > > Just replaced an older circa 2012 Apple Time Capsule with a new Airport > > Extreme in my home gigabit network. And in the category of “it’s always > > something,” I discover that the AEX powers down with my K3S/KPA500 at 500 > > watts. Just shits off. Admittedly, they sit just feet away from each > > other, but care is taken to separate RF lines from audio lines and > network > > lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? > > > > David A., KK6DA, LA > > > > > > David Ahrendts [hidden email] <javascript:;> > > > > > > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[hidden email] <javascript:;> > > > > 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] <javascript:;> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] <javascript:;> > > 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] <javascript:;> 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] |
Re: OT Apple Airport Extreme RFI
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In reply to this post by David Ahrendts
That did it. Many thanks, Steve. I took it a couple of steps further also. Got out a bunch of snap on ferrites and made a couple of one turn wraps on the AEX power cable. Further, I had intended on installing the MFJ 1164B AC Line RFI Filter (a 4-plug rugged RFI filter with a separate external ground), so I plugged it into a separate AC circuit and that combination made the AEX happy. 500 watts no problem.
Like so many people, I have several Mac computers, two printers, an audio system, lamps, misc. gear all in proximity to the K3S and KPA500, and even though I do run a separate AC line for the ham gear, the non-ham gear is powered with a hodgepodge of power strips and extension cords. Clearly I need to get those in order also. So, case closed — happy to advise anyone who might have the same issue on my steps to resolve it. Back to my Oscar party. :—) David A., KK6DA, LA > On Feb 28, 2016, at 11:39 AM, [hidden email] wrote: > > Hi David - Can you try putting all of the non-radio gear on a separted AC circuit? > > GL - Steve WB6RSE > > > > On Feb 28, 2016, at 11:24 AM, David Ahrendts <[hidden email] <mailto:[hidden email]>> wrote: > > Just replaced an older circa 2012 Apple Time Capsule with a new Airport Extreme in my home gigabit network. And in the category of “it’s always something,” I discover that the AEX powers down with my K3S/KPA500 at 500 watts. Just shits off. Admittedly, they sit just feet away from each other, but care is taken to separate RF lines from audio lines and network lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? > > David A., KK6DA, LA > David Ahrendts [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] |
Re: OT Apple Airport Extreme RFI
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In reply to this post by David Ahrendts
On Sun,2/28/2016 11:24 AM, David Ahrendts wrote:
> Just replaced an older circa 2012 Apple Time Capsule with a new Airport Extreme in my home gigabit network. And in the category of “it’s always something,” I discover that the AEX powers down with my K3S/KPA500 at 500 watts. Just shits off. Admittedly, they sit just feet away from each other, but care is taken to separate RF lines from audio lines and network lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? First, take it back and get your money, and tell them why. Second, if you decide not to do that, carefully choke all of the cables connected to it, following the guidelines in k9yc.com/RFI-Ham.pdf for ferrite common mode chokes for the ham bands where there is a problem. Proximity between transmitter and the box doesn't matter -- transmitters themselves don't radiate. What matters is proximity to ANTENNAS -- that's what radiates. The cables connected to the Apple box can act as both TX and RX antennas, including the power supply, which itself can be a powerful noise source. Also, be sure to listen for RF trash. The good news is that the chokes you install to protect the unit will also reduce trash radiated by those cables from the unit (and from the power supply). 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] |
Re: OT Apple Airport Extreme RFI
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You are MUST READ, Jim. Thank you for your contributing your wisdom on this topic.
David A., KK6DA, LA > On Feb 28, 2016, at 2:03 PM, Jim Brown <[hidden email]> wrote: > > On Sun,2/28/2016 11:24 AM, David Ahrendts wrote: >> Just replaced an older circa 2012 Apple Time Capsule with a new Airport Extreme in my home gigabit network. And in the category of “it’s always something,” I discover that the AEX powers down with my K3S/KPA500 at 500 watts. Just shits off. Admittedly, they sit just feet away from each other, but care is taken to separate RF lines from audio lines and network lines. The newer AEX introduces Apple’s 802.11ac protocol. Any guesses? > > First, take it back and get your money, and tell them why. > > Second, if you decide not to do that, carefully choke all of the cables connected to it, following the guidelines in k9yc.com/RFI-Ham.pdf for ferrite common mode chokes for the ham bands where there is a problem. > > Proximity between transmitter and the box doesn't matter -- transmitters themselves don't radiate. What matters is proximity to ANTENNAS -- that's what radiates. The cables connected to the Apple box can act as both TX and RX antennas, including the power supply, which itself can be a powerful noise source. > > Also, be sure to listen for RF trash. The good news is that the chokes you install to protect the unit will also reduce trash radiated by those cables from the unit (and from the power supply). > > 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] David Ahrendts [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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