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Old 09-15-2004, 09:54 PM   #1
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New MH Lights odd Interference

My new tank is going to be in my home "office". My new coralvue dual 250MH kit arrived today so I mounted the balasts in the stand and ran the lights for a few minutes just to make sure they worked. Odd thing was when they were running my MX700 cordless mouse "died". Well actually it didn't die but its range was cut down to 2-3ft.

Has anyone ran into this before?
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Old 09-16-2004, 12:33 AM   #2
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why type of ballest are they. some things make frequencys like a microwave kill all of my cordless phones.
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A 46 gal bow front (Soft coral) reef tank with a 10 gal sump. And a 30 gal (SPS and Clam) reef tank hooked up to the sump of the 46 so they share water.
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Old 09-16-2004, 12:25 PM   #3
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The ballasts put out a tremendous amount of RFI (Radio Frequency Interference) even thought by FCC regs they are not supposed to (The FCC no longer has the resources to combat it)

Solutions are:
Move the equipment further apart (not always possible)
Apply grounded shielding (not always easy)
Stop the RFI from radiating (easy but involved)

The easiest way is to apply Ferrite Chokes around the cables leading into and out of the ballast. Also do the same thing with the cordless mouse cords (and other's going into and out of the PC)

You can get snap-on chokes at Radio Crap (sorry Radio Shack) but they are quite small and only work for thin gauge wires. Better bets are to search on eBay for Ferrite, that should pop-up a bunch of items.

Ferrite type 43 is good for 0 to about 30MHz. If your cordless mouse is in the 27MHz range, as most are, those would work the best. Type 77 works at higher frequencies.

i.e.

http://cgi.ebay.com/ws/eBayISAPI.dll...839236450&rd=1
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55g Reef
(3) Maxi-Jet 1200's, Wavemaker Pro
AquaC Remora Skimmer
100lbs Live Rock
20g Refugium
(1) Scarlet Cleaner Shrimp
(1) Peppermint Shrimp
(2) False Percs
(1) Orchid Dottyback
(1) Lawnmower Blenny
(1) Flame Angel
(1) Spotted Mandarin
(1) Red Brittle Star
(1) Banded Serpent Star

"But then again, fish do tend to eat one another. I often wonder ... if fish get awfully tired of seafood? What are your thoughts Hobson?"
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Old 09-16-2004, 12:39 PM   #4
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That is excellent advice gear-head. Thanks for posting such valuable information. These are the types of posts we like to see, concise, to the point, and on the mark.
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Old 09-16-2004, 01:44 PM   #5
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I knew my other hobby would come in Handy!

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55g Reef
(3) Maxi-Jet 1200's, Wavemaker Pro
AquaC Remora Skimmer
100lbs Live Rock
20g Refugium
(1) Scarlet Cleaner Shrimp
(1) Peppermint Shrimp
(2) False Percs
(1) Orchid Dottyback
(1) Lawnmower Blenny
(1) Flame Angel
(1) Spotted Mandarin
(1) Red Brittle Star
(1) Banded Serpent Star

"But then again, fish do tend to eat one another. I often wonder ... if fish get awfully tired of seafood? What are your thoughts Hobson?"
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