[RFI] led bulb test

[David Robbins]

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 at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373



-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of W0MU Mike
Fatchett
Sent: Wednesday, November 09, 2016 18:01
To: rfi at 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 at arrl.net> mailto:k1ttt at 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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