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Author Topic: Transmitter restarting my Airport Extreme router..  (Read 4266 times)
N0WY
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Posts: 6




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« on: April 24, 2012, 03:36:05 PM »

All,

My Airport Extreme router restarts occasionally (not with every transmission - but 30 - 40% of the time) when I transmit on my FT-857.  It happens even at times when my LDG tuner does a simple tune to a band. 

I have turned off the wireless feature of the router (so everything was hard wired with cat-5) and it stilled happened.

Any suggestions?  I have checked the coax cables inside / outside of the house - no problems.  Will Ferrite cores on my router help?  Installed on the power or on the ethernet cable or both?

Thanks,

Michael


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K3AN
Member

Posts: 787




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« Reply #1 on: April 25, 2012, 04:02:58 PM »

How far is your antenna from the router (direct distance)? What kind of antenna feedline are you using- coax or ladder line? On what band(s) does this problem occur?

I have no problem with RFI using a Netgear router. Only two Ethernet cables- one from cable modem to router and one from router to the desktop computer. Neither Ethernet cable is shielded. I bundle up the extra cable length to minimize pickup and radiation.
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N0WY
Member

Posts: 6




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« Reply #2 on: April 25, 2012, 04:38:12 PM »

My antenna is about 50 feet away.  Utilizing LMR400 from the antenna to the mfj pass thru (tested without and still had this problem).  This is happening on all bands from 80 - 10m.

Thanks for any assistance you can give.

Michael
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K5LXP
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Posts: 4507


WWW

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« Reply #3 on: April 25, 2012, 08:22:59 PM »

Have you done an RF sweep to see what power levels on which bands have this effect?  Once you do that, then you can take isolation measures (like ferrites, cable relocation, antenna common mode mitigation) then retest to see if what you're doing is having a positive effect.


Mark K5LXP
Albuquerque, NM
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N2QLT
Member

Posts: 27




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« Reply #4 on: April 26, 2012, 01:17:38 PM »

A bead on every lead makes a happy ham.
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W0FM
Member

Posts: 2056




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« Reply #5 on: May 09, 2012, 01:41:50 PM »

I would also consider replacing the CAT-5 cable with shielded CAT-5 or 6.
The ferrite cores might help also, but RFI hunting is a lot of trial and error. 

And, a transmission is a transmission.  RF is being transmitted. It doesn't matter if it is keyed by the LDG tuner or by your PTT key.
 
Good luck..

73,

Terry, WØFM
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KF7CG
Member

Posts: 840




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« Reply #6 on: May 10, 2012, 09:37:02 AM »

When going to sheilded twisted pair cables for your network, be sure to check your maximum reliable data distances, Your maximum cable run without an intervening router or other signal reconstruction device is decreased significantly by the cable sheild. The maxmimum usable distance reduction can be as high as a factor of 10, even in high quality cable.

KF7CG
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NN4F
Member

Posts: 51




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« Reply #7 on: May 10, 2012, 12:22:09 PM »

I had the same issue with a brand new cicso when running anothing over 200watts, it turned out to be the cheap power supply, plugged in the original (larger in size) from a Linksys and the reboots went away.... if it's a newer airport, perhaps the PS isn't as robust...

 
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K1CJS
Member

Posts: 6045




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« Reply #8 on: May 20, 2012, 04:32:08 PM »

Wall warts are notorious for being the culprits when RFI is involved--either they generate it or they pick it up and introduce it to the router.  If the unit uses 12 VDC, try running it off a battery.  If the problem goes away, you've found the cause.  Good luck and 73!
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