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Date: Wed, 03 May 2006 01:14:22 +0200
From: Marek SQ5BPM <sq5bpm@wp.pl>
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Subject: Re: LF: EMF sensitivity?
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Hello Rik and all,

Now I am nearly sure this was the UVB, the result is almost like 
spending too much time at the sun, with the skin dry etc. This happened 
only on the side of my face directly exposed to the loading coil. 
Sincerely, I had no idea the coronal effect might be something to care 
about due to possible health injuries (excluding direct touching of a HV 
wire).

Anyway, I will take an old plastic trash bin, wind some 100 turns and 
put it up on the roof, between the vertical antenna part and the top 
load. This will hopefully reduce the voltage and power losses inside the 
club room. The loading coil inside the club will then act only as the PA 
output matching network and a variometer.

All in all, this is something to add in descriptions of loading coils: 
(invisible) coronal effects may cause UVB radiation that might be 
harmful for the skin after longer exposure.

BTW I checked that the UV radiation level is not enough for the coil to 
act as a banknote checker ;)

73! Marek SQ5BPM

Rik Strobbe wrote:
> Marek,
>
> UV-light can cause irritation (or "burning") of the skin at 
> intensities far below what can be detected by UV-sensitive markers. 
> It's just a matter of how long you are exposed to it.
> Maybe you could try a good "sun-block" cream (the ones you use when 
> going to the beach in summer) on you face.
> If it is UV that causes the rash: glass blocks UV rather effective. It 
> would stop teh UV while still allowing visual control of the coil.
>
> 73, 
> Rik   ON7YD & OR7T
>
> Citeren Marek SQ5BPM <sq5bpm@wp.pl>:
>
>   
>> Hello Peter,
>>
>> Peter Martinez wrote:
>>     
>>>> From Peter G3PLX:
>>>>         
>>> Marek:
>>>
>>> The 'rash' or 'burning' effect makes me think of sunburn or
>>>       
>> exposure 
>>     
>>> to ultra-violet light.
>>>
>>> Could it be that there is some ionisation, perhaps due to high 
>>> voltages, which gives off UV radiation which could affect the skin
>>>       
>> of 
>>     
>>> the face if it's directly in front of the operator?  It would be
>>>       
>> easy 
>>     
>>> to test this idea by operating the equipment in a low light level
>>>       
>> and 
>>     
>>> probing the area with a some object that was known to be
>>>       
>> fluorescent, 
>>     
>>> like a UV-sensitive marker pen.
>>>       
>> I thought about something connected with the high voltage as well - 
>> maybe high electrostatic field etc. I didn't know that ionisation may
>>
>> cause UV radiation. I will check the idea, placing a banknote near
>> the 
>> coil output ;)
>>
>> The UV idea makes sense, the rash appeared on the side of  my face
>> being 
>> in direct 'exposure' to the coil, not at the side of the
>> transmitter.
>>
>> 73! Marek SQ5BPM
>>
>>
>>     
>
>
>
>
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