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Author Topic: Cable Modem RFI  (Read 9721 times)
K1CJS
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Posts: 5889




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« Reply #15 on: April 24, 2013, 03:27:33 PM »

Keep your eyes open at yard sales.  Sometimes you see older 12 volt 5-7 amp power supplies that were used for CBs in years past.  They're about the best because they're filtered and have plenty of capacity to run the modem.
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KD8TZC
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Posts: 67




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« Reply #16 on: April 25, 2013, 10:17:33 AM »

And how can you tell if one is filtered?
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John - KD8TZC
K1CJS
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Posts: 5889




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« Reply #17 on: April 25, 2013, 10:26:57 AM »

Considering that CB is AM, any decent power supply made for CB will have to be filtered as to not introduce noise on the radio itself.  In any event, they're filtered better than the wall warts are that are so abundant these days!
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K1CJS
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« Reply #18 on: April 26, 2013, 05:04:39 AM »

Sometimes you can get a quieter wall wart from the cable company itself.  Take the old one to the office and talk to a technician there.  Explain what you're looking for and they may be able to get one for you.  You may also try using an old CB power supply--a 12 volt 5 to 7 amp supply.  Simply check the polarity of the connector, cut the wall wart off, and wire up the connector to the supply so the polarity is identical. 
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