Message-ID: <4D6D5477.3050909@iup.uni-heidelberg.de>
Date: Tue, 01 Mar 2011 21:17:59 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <4D6D4542.28569.16DBCA9@mike.dennison.ntlworld.com> <4D6D514A.4040602@talktalk.net>
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Subject: Re: LF: Low energy bulbs
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Regarding energy bulbs, maybe it is an idea to put a well designed EMI 
filter <http://www.amateurfunkbasteln.de/netzfilter/Netzfilter.gif> into 
the bulb cable, as close as possible?

73, Stefan/DK7FC

Am 01.03.2011 21:04, schrieb qrss@talktalk.net:
> 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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Regarding energy bulbs, maybe it is an idea to put a well designed <a   href="http://www.amateurfunkbasteln.de/netzfilter/Netzfilter.gif">EMI
filter</a> into the bulb cable, as close as possible?<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 01.03.2011 21:04, schrieb <a class="moz-txt-link-abbreviated" href="mailto:qrss@talktalk.net:">qrss@talktalk.net:</a>
<blockquote cite="mid:4D6D514A.4040602@talktalk.net" type="cite">
  <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
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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