I just ordered two 6-packs of 60w LED bulbs on a special deal from the power
companies, $10/6-pack. I'll test them the same way when they get here.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of W0MU Mike
Fatchett
Sent: Wednesday, November 09, 2016 18:01
To: rfi@contesting.com
Subject: Re: [RFI] led bulb test
I have been using 60w led bulbs for a while. Have not noticed any new
noise. They are pretty inexpensive with the power companies kicking in on
the costs.
W0MU
On 11/9/2016 10:22 AM, David Robbins wrote:
> Bought a relatively expensive single 100w replacement GE LED bulb
> today just to try a new one out after my disappointment years ago with
> an early product that trashed everything. The part numbers and stuff off
the box are:
>
>
>
> PC: 65935
>
> Desc: LED15DA21/BX
>
> Res. # 1517294
>
> Sku: 0 43168 65935 2
>
> String under sku: CNTLEDA211DM15GE65935ASCH-02
>
>
>
> It cost $15.29 at PriceChopper/Market32 in Pittsfield.
>
>
>
> 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.
>
>
>
>
>
>
>
> David Robbins K1TTT
> e-mail: <mailto:k1ttt@arrl.net> mailto:k1ttt@arrl.net
> web: <http://wiki.k1ttt.net/> http://wiki.k1ttt.net AR-Cluster node:
> 145.69MHz or <telnet://k1ttt.net:7373>
> telnet://k1ttt.net:7373
>
>
>
>
>
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