[Amps] Cell phones, digital cameras and RF

[Charles Harpole]

High RF fields ... like being in a shack with two KWs running, puts lines in the video of a SONY PD -100 model camera.  Tested.  

Charles Harpole
k4vud at hotmail.com   
 > Date: Mon, 5 Mar 2012 15:43:06 -0500
> From: k8ri at rogerhalstead.com
> To: amps at contesting.com
> Subject: Re: [Amps] Cell phones, digital cameras and RF
> 
> On 3/5/2012 12:40 PM, Fuqua, Bill L wrote:
> >    How many times have you taken a picture of an amplifier tube glowing very red with the cover removed and with a cell phone or digital camera?
> > I have done it a number of times and yet the relatively intense RF electric fields seem to have no effect. I have taken photos of my 4-1000A amp with
> > bright red plate and probably 6 or 7kV p-p rf only a foot away or so.
> > They must be very well shielded!
> 
> They are poorly shielded, but their operating frequencies and physical 
> construction makes them pretty much immune to HF.
> I've never used the camera in the cell phone because no matter how many 
> pixels they brag about they are limited by the laws of physics and that 
> tiny lens.
> Even the digital SLRs are limited by the lens but with those you can get 
> the equivalent of a good 35mm film.
> 
> The camera in the cell phone is "handy" for some things but not for 
> images you wish to make full screen on the computer or prints that are 8 
> X 10 or larger.  At least I've never seen one. Some smart phones have 
> promised to take multiple images and  combine them for resolution.
> 
> 73
> 
> Roger (K8RI)
> 
> 
> >    73
> > Bill wa4lav
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> 
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