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@hotmail.com
> Date: Mon, 5 Mar 2012 15:43:06 -0500
> From: k8ri@rogerhalstead.com
> To: amps@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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