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2016-11-10 9:08 GMT+09:00 Jim Brown <jim@audiosystemsgroup.com>:
> On Wed,11/9/2016 9:22 AM, David Robbins wrote:
>
>> I ran some un-reproducible tests to see if it was acceptable for use near
>> my
>> station. my basic conclusion is that it is adequately quiet, I can not
>> hear
>> anything from it on my outside antennas. To try to find discrete signals
>> or
>> overall noise I ran a couple tests with an sdr connected to a test lead
>> wrapped around the fixture and the bulb itself to find conducted signals
>> or
>> those radiated in the near field. First, the fundamental frequency of the
>> switching supply is about 85khz with a rather wide noise band up to about
>> 135khz. The wide noise band spreads out the energy of the harmonics over
>> a
>> fairly wide bandwidth so individual frequencies of harmonics can't be seen
>> like a more stable source like monitors or computer clocks can. With my
>> test lead loop around the fixture (an incandescent track light) I could
>> see
>> noise about 3db above the noise floor above about 25MHz, below that I saw
>> no
>> change in the noise floor and no discrete frequencies. I could not hear
>> any
>> increase in the noise floor with my 10m antennas aimed at the shack from
>> about 200' away or on 15m from about 100' away.
>>
>
> Thanks for posting this work. Several comments. First, the use of an SDR
> to look at spectra of the noise is a really good idea. I'm currently
> working on updates to the ARRL Handbook, and this is something I'm
> suggesting. The SDRPlay ($130) is a particularly good choice, because it
> has a very wide tuning range and can display a large chunk of spectrum at
> one time.
>
> Second, while this lamp is acceptable for your station with antennas
> spaced 100-200 ft from the fixture, it might not be for hams with antennas
> much closer to these lamps. Repeating your tests with closer spacing would
> be useful. So would the SDR looking at the spectrum at the antenna.
>
> Third, it would be interesting to explore the effect of the lighting track
> on radiated noise, if any. The tracks I've seen are parallel wires in a
> metallic tray that is open on one side, and the tray should be bonded to
> the green wire. Was that true for the track in which you tested? The SMPS
> is, of course, inside the base of the bulb, with connection only to phase
> and neutral.
>
> Another great alternative for shack lighting are strips of LEDs sold by
> vendors at ham flea markets. Many of them self-regulate to a wide range of
> DC and AC voltages.Wired Communications is a good vendor who exhibits at
> Pacificon and Visalia, and has an online presence. But don't use their SMPS
> to run the lights -- use your own linear wall wart. I'm lighting my shack
> with five strips that draw a combined 1.25A from my 12V system.
>
> 73, Jim K9YC
>
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