[RFI] Thumper & not the rabbit

[Pete Smith N4ZR]

I remember very well when the FCC first adopted these rules.  I did a 
lot of homework at the time and, to my mind at least, it was junk 
science.  I don't blame the FCC (much) for adopting a standard, and for 
most of us their exposure limits are not an issue. This unfortunately is 
the exception.

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 3/30/2014 12:19 PM, qrv at kd4e.com wrote:
> I missed the low roof-mounted beam detail - that increases the
> likelihood of indoors resonances!
>
> Most low-level RF-exposure fear-mongering, other than at SHF/Microwave
> frequencies, is likely junk science.
>
> "Typical diagnostic sonographic scanners operate in the frequency range
> of 2 to 18 megahertz, though frequencies up to 50–100 megahertz have
> been used experimentally in a technique known as biomicroscopy in
> special regions, such as the anterior chamber of the eye.[3] The choice
> of frequency is a trade-off between spatial resolution of the image and
> imaging depth: lower frequencies produce less resolution but image
> deeper into the body. Higher frequency sound waves have a smaller
> wavelength and thus are capable of reflecting or scattering from smaller
> structures. Higher frequency sound waves also have a larger attenuation
> coefficient and thus are more readily absorbed in tissue, limiting the
> depth of penetration of the sound wave into the body (for details, see
> Acoustic attenuation.)
>
> "Sonography (ultrasonography) is widely used in medicine. It is possible
> to perform both diagnosis and therapeutic procedures, using ultrasound
> to guide interventional procedures (for instance biopsies or drainage of
> fluid collections). Sonographers are medical professionals who perform
> scans which are then typically interpreted by radiologists, physicians
> who specialize in the application and interpretation of a wide variety
> of medical imaging modalities, or by cardiologists in the case of
> cardiac ultrasonography (echocardiography). Sonographers typically use a
> hand-held probe (called a transducer) that is placed directly on and
> moved over the patient. Increasingly, clinicians (physicians and other
> healthcare professionals who provide direct patient care) are using
> ultrasound in their office and hospital practices, for efficient,
> low-cost, dynamic diagnostic imaging that facilitates treatment planning
> while avoiding any ionising radiation exposure.
>
> "Sonography is effective for imaging soft tissues of the body.
> Superficial structures such as muscles, tendons, testes, breast, thyroid
> and parathyroid glands, and the neonatal brain are imaged at a higher
> frequency (7–18 MHz), which provides better axial and lateral
> resolution. Deeper structures such as liver and kidney are imaged at a
> lower frequency 1–6 MHz with lower axial and lateral resolution but
> greater penetration."
>
> Wikipedia
>
>> Can you share the results of the RF Exposure evaluation you are
>> required to perform by the FCC regulations affecting your license?
>> Your description of your antenna placement and your earlier comments
>> about QRO makes it sound like you have a much more serious problem
>> than "Thumper."
>>
>> QRO to a low roof mounted tribander presents serious RF safety
>> issues every inhabitant of your home. FCC regulations that affect
>> your license require that you inform every inhabitant and guest in
>> your home about RF exposure safety of the risks they face.
>> Furthermore, every inhabitant and guest must agree to accept their RF
>> exposure risks.
>>
>> http://www.arrl.org/fcc-rf-exposure-regulations-the-station-evaluation
>>
>>  73 Frank W3LPL
>
>