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Re: [RFI] FW: Low Band Interference Report (non-ham radio reports)

To: rfi@contesting.com
Subject: Re: [RFI] FW: Low Band Interference Report (non-ham radio reports)
From: David Robbins <k1ttt@verizon.net>
Reply-to: k1ttt@arrl.net
Date: Tue, 08 Jul 2014 11:34:13 -0500 (CDT)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
that may not only occur in fluorescent ballasts.  I bought 2 LED bulbs, no-name 
Chinese made, one was marked 90-240v, the other marked just 120v.  the wide 
voltage one threw hash everywhere, the 120v one I can't hear on anything.

Jul 8, 2014 12:07:12 PM, eedwards@oppd.com wrote:

From: PrivateWirelessForum@yahoogroups.com
Subject: (PWF) Low Band Interference Report

NY DOT reports they have been experiencing severe interference issues with 
their low band radios and have found the culprit to be high efficiency 
fluorescent ballasts. They have narrowed it down to the ballasts that are 
commercial grade and that operate at multiple voltages (120-277V). The ballasts 
that had that operated strictly on 120V did not cause issues. They believe it 
comes from the switching power supply that allows for multi-voltage use and 
they have tested ballasts that are single voltage (120V) and they do not cause 
harmful interference. NTDOT has contacted a few manufacturers (Sylvania, 
Philips, GE) and they have stated that they have heard of very few interference 
issues and they are trying to consolidate product and stop manufacturing single 
voltage ballasts. The noise can be as high as -80 dbm from 30-80Mhz. The 
manufacturers state that these ballasts meet FCC Part 18 rules (Industrial and 
commercial). NYDOT would like the other low band users out there to be 
aware of this.

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