[Elecraft] Amplifier

[Mike Harris]

I had the opportunity to borrow an R&S professional field strength meter 
from the local telco when there were concerns over the installation of 
mobile phone towers in town. The worriers obsessed over the towers but 
completely ignored the little transmitters they and their kids would be 
clamping to the side of their brains.

My HF beam is 12.5 metres high on a tower. With 1kW from the amp, 
standing directly at the base of the tower the field strength measured 
was well below the guidlines for RF exposure.

Living at the base of a steep sloping ridge to the south it was easy to 
elevate myself to the plane of the antenna beaming at me from about 35 
to 40 metres. When the TX at 1kW was keyed there was no indicated 
increase in field strength over the background reading. Also duty cycle 
comes into play.

There are a couple of FCC bulletins, OET65 and specifically for radio 
amateurs OET65B which go into a lot of detail on this subject. They are 
dated late 1997 and I've not check to see if there are more recent 
revisions.

Regards,

Mike VP8NO



On 07/04/2017 09:50, Wes Stewart wrote:
> I assume you're commenting on the 1KW 20' away, although failed to say
> so.  Turn this scenario around: pretend that you were trying to do
> medical treatment or research by heating your body to a biologically
> significant temperature. How much power to a transducer 20' away would
> it take?
>
>
> On 4/7/2017 3:10 AM, Bill wrote:
>> That proximity would scare me - I'd feel like I was on a skewer in a
>> microwave oven.