Message-ID: <4D6E84C5.6050508@freenet.de>
Date: Wed, 02 Mar 2011 18:56:21 +0100
From: wolf_dl4yhf <dl4yhf@freenet.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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Just my few pennies worth:

If you need a QRM-free energy saving lamp, try a mains powered LED.
I have one here, with a pleasant *warm white* tone, which doesn't cause 
QRM because it cannot:

There is only a full-wave rectifier in it, a small capacitor, a current 
limiting resistor, and -hold your breath- :
About 80 (!) small white LEDs all connect in series, driven directly 
from the rectified mains !

I removed the outer glass dome because imo the LEDs got a little hot 
inside, but no problems with it ever since.
Starts immediately at full intensity, and by theory should not suffer 
from frequently turning it on / off .
Downside: Quite expensive, almost 20 Euros for a single 4 Watt lamp.  
Hope it lasts forever ;-)

Cheaper LED lamps were sold at "Aldi" (german food discounter) about a 
year ago, only 2.5 Watt, 110 lumen, but also warm colour, QRM-free, and 
now serving as 'ambient illumination' for the shack.

Another "huge" LED I tried was a low-voltage powered white "Monster LED" 
by Huey Jann, but I didn't like the colour which is somehow "purplish" :

http://www.hueyjann.com.tw/self_pages/en/hi_power_led_10w_100w.html



Cheers,
    Wolf .


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
>> ==========
>>
>>
>>
>>
>> The following section of this message contains a file attachment
>> prepared for transmission using the Internet MIME message format.
>> If you are using Pegasus Mail, or any other MIME-compliant system,
>> you should be able to save it or view it from within your mailer.
>> If you cannot, please ask your system administrator for assistance.
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>


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    Just my few pennies worth:<br>
    <br>
    If you need a QRM-free energy saving lamp, try a mains powered LED.
    <br>
    I have one here, with a pleasant *warm white* tone, which doesn't
    cause QRM because it cannot:<br>
    <br>
    There is only a full-wave rectifier in it, a small capacitor, a
    current limiting resistor, and -hold your breath- :<br>
    About 80 (!) small white LEDs all connect in series, driven directly
    from the rectified mains !<br>
    <br>
    I removed the outer glass dome because imo the LEDs got a little hot
    inside, but no problems with it ever since.<br>
    Starts immediately at full intensity, and by theory should not
    suffer from frequently turning it on / off .<br>
    Downside: Quite expensive, almost 20 Euros for a single 4 Watt
    lamp.&nbsp; Hope it lasts forever ;-)<br>
    <br>
    Cheaper LED lamps were sold at "Aldi" (german food discounter) about
    a year ago, only 2.5 Watt, 110 lumen, but also warm colour,
    QRM-free, and now serving as 'ambient illumination' for the shack.<br>
    <br>
    Another "huge" LED I tried was a low-voltage powered white "Monster
    LED" by Huey Jann, but I didn't like the colour which is somehow
    "purplish" :<br>
    <br>
    <a class="moz-txt-link-freetext" href="http://www.hueyjann.com.tw/self_pages/en/hi_power_led_10w_100w.html">http://www.hueyjann.com.tw/self_pages/en/hi_power_led_10w_100w.html</a><br>
    <br>
    <br>
    <br>
    Cheers,<br>
    &nbsp;&nbsp; Wolf .<br>
    <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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