I just took some photos of my rather poorly shielded 4-1000 amplifier
running key down carrier on 20M with my Nikon D90 and did not notice any
issues at all. Neither have I seen issues with my Android smart phone in
the shack at any time during a contest weekend.
Mike, W1NR
On 03/05/2012 10:08 PM, Charles Harpole wrote:
>
> 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
>>
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