Hi
I'll try and answer your questions below, with >>>
On Jan 29, 2011, at 5:41 PM, Dale Svetanoff wrote:
> Myles,
>
> Yes, those are very nice lamps, although I do not presently have any in my
> house. (If I am not mistaken, Ottlights are those used by the appraisers
> on "Antiques Roadshow". They have excellent color balance and uniformity
> of illumination.) A few questions:
> >>> saw the show never noticed those lights good trivia catch -- however not
> >>> all are color balanced some are and there is an option for balanced
> >>> replacement bulbs, i've tried both.
both work very nice (rfi not withstanding) placed on the corner of a desk
they do illuminate the knobs of even a large ham rig really nice
> 1. Since it is a desk light, I presume it is plugged into the wall socket.
> Is it the same socket from which your rig draws power?
>no it is not the same socket not the same breaker additionally most of my
>equipment is somewhat isolated by medical grade isolation transformers and
>RFI filters.
>
> 2. What is "walking away"? Do you mean that you take and move the lamp
> further away from the rig?
>>I should have explained that better, when I noticed the interference on my
>>desk lamp I tried my battery powered FT817d walked near the light
>>interference was strong as I moved away it was less, turning off the
>>light =no interference I wanted to see how far/strong the interference was
>>so typically I use my FT817 and or my portable spectrum analyzer to make
>>simple tests.
>
> 3. RFI coupling from an RFI source into the cabinet of a rig is somewhat
> rare (as mentioned on this reflector many times in the past). So, is the
> lamp near an antenna or tuner used with the rig? If so, what's the
> separation distance between the lamp and antenna or tuner?
>>>it has not been all that rare in my personal experience however I do
>>>agree that overall all most of the time that would be true
Yes the lamp was on my desk near the ham rig, no tuners or other gear
just my lamp and the rig separation distance was within 2 feet interf can
be clearly heard for several feet if I put the lamp on the other side of my
room which would be about 18ft away
Coax is hardline or quad shielded cable , my grounds are pretty good.
hope this helps a little
>
> Thanks in advance for your answers. This will help the rest of us get a
> handle on just what might be happening.
>>anything I can do to help, just ask
ml
>
> 73, Dale
> WA9ENA
>
>
>> [Original Message]
>> From: myles landstein <myles.landstein@gmail.com>
>> To: Rfi <rfi@contesting.com>
>> Date: 1/29/2011 3:37:57
>> Subject: [RFI] desklight RFI---FYI
>>
>> Just got a Ottlight desk lamp from Lowes, throws out a lot of rfi.
>>
>>
>> Noisy all over 1-50Mhz a few bands will be s9
>>
>> Seems to taper off as you walk away
>>
>>
>>
>> Haven't had a chance to make a full spectrum sweep yet with instruments,
> but the above was observed while the lamp was on my desk w/my rig, and I
> just quickly tuned around 1-50Mhz
>>
>> They also make a floor standing model, I have not opened the box yet
> , but will test soon....
>>
>> Very nice light if you're NOT a ham.
>>
>>
>>
>>
>>
>>
>>
>>
>> Going to Dayton '11 It will get better with
>> more support!
>>
>> Myles D Landstein
>> N2EHG
>> myles.landstein@gmail.com
>>
>>
>>
>>
>>
>>
>>
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>
>
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