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Date: Tue, 01 Mar 2011 20:04:26 +0000
From: "qrss@talktalk.net" <qrss@talktalk.net>
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References: <4D6D4542.28569.16DBCA9@mike.dennison.ntlworld.com>
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Subject: Re: LF: Low energy bulbs
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I have one CFL at the moment which gives the same pattern on 24kHz. Over 
the years I have had all makes play up, one decided to wipe out 10MHz, 
that was due to a dry joint on a suppression capacitor. Dry joints have 
also caused other interference and total failure. I  have dismantled 
several CFL's, poor soldered joints are rife in them, some components 
can often be pulled dry from the PCB.
  Some designs are a nice source of a VLF ring core, material / type 
unknown, I have used them for coupling on two 500kHz / 136kHz multi turn 
RX Loops.

As for filament lamps, there is always the classic 'candle bulb effect' 
which wipes out  analogue TV, I did have the pleasure of finding one of 
those in a customers house once.

Eddie G3ZJO

On 01/03/2011 19:13, Mike Dennison wrote:
> Today I noticed QRM on 136kHz that started when my wife switched a
> light on in our spare room. It had a low energy bulb by Status, and
> was marked "11W, 220-240V, 50/60Hz, 100mA". It is described on their
> web site as "stick type" and is bayonet fitting. The QRM consisted of
> rapidly changing noise sweeping back and forth across the band (see
> attached pic).
>
> I replaced it with a Philips Genie WW287 light which did not seem to
> generate any noise.
>
> The other low energy lights in the house are General Electric E27-ES
> 11W bulb types which are very slow to get to full brightness, but are
> low QRM at LF. The rest are ancient filament types which are
> completely QRM-free of course.
>
> So if you have this noise, perhaps it's one of your light bulbs.
>
> Mike, G3XDV
> ==========
>
>
>
>
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    I have one CFL at the moment which gives the same pattern on 24kHz.
    Over the years I have had all makes play up, one decided to wipe out
    10MHz, that was due to a dry joint on a suppression capacitor. Dry
    joints have also caused other interference and total failure. I&nbsp;
    have dismantled several CFL's, poor soldered joints are rife in
    them, some components can often be pulled dry from the PCB.<br>
    &nbsp;Some designs are a nice source of a VLF ring core, material / type
    unknown, I have used them for coupling on two 500kHz / 136kHz multi
    turn RX Loops.<br>
    <br>
    As for filament lamps, there is always the classic 'candle bulb
    effect' which wipes out&nbsp; analogue TV, I did have the pleasure of
    finding one of those in a customers house once.<br>
    <br>
    Eddie G3ZJO<br>
    <br>
    On 01/03/2011 19:13, Mike Dennison wrote:
    <blockquote        cite="mid:4D6D4542.28569.16DBCA9@mike.dennison.ntlworld.com"        type="cite">
      <pre wrap="">Today I noticed QRM on 136kHz that started when my wife switched a 
light on in our spare room. It had a low energy bulb by Status, and 
was marked "11W, 220-240V, 50/60Hz, 100mA". It is described on their 
web site as "stick type" and is bayonet fitting. The QRM consisted of 
rapidly changing noise sweeping back and forth across the band (see 
attached pic).

I replaced it with a Philips Genie WW287 light which did not seem to 
generate any noise.

The other low energy lights in the house are General Electric E27-ES 
11W bulb types which are very slow to get to full brightness, but are 
low QRM at LF. The rest are ancient filament types which are 
completely QRM-free of course.

So if you have this noise, perhaps it's one of your light bulbs.

Mike, G3XDV
==========


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      <pre wrap="">
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