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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