Very good, Mike and Dan!
Dan I watched your video. And Mike, I see a lot on the NearFest site that you wrote up. Instead of thinking about it for the next two years, I decided to do it
now and get it out of the way.
The ARRL site has a good RF calculator link that I included below. It uses dBi for antenna radiation calculations. I did all of my antennas in less than 30 minutes, made some full report copies and placed one at the operating position next to the FCC rulebook in case of a visit.... Find below a sample of my 75M antenna/radiation description and calculations included in the report to get the general idea of how to do each band...
Easy as pie.
ARRL site calculator link: (Lake Washington Ham Club)
http://www.lakewashingtonhamclub.org/resources/rf-exposure-calculator/My own description and field strength calculations for 75M taken from the report:75MThe antenna is a pair of wire delta loops (2 elements) on a 40' boom at 190' high. (12 dBi) I also have a flat dipole (6 dBi) at 90' high. I used 1500W average power at the antenna to be conservative since the duty cycle of CW, SSB and AM is less than 1500W. Antenna gain was calculated using NEC4 software.
Both of these antennas are at least 230' from the operating position fed with underground 3/4" CATV hardline. The public street is about 300' away from any antenna. The nearest neighbor's house is ¼ mile away. This is a safe installation since the minimum uncontrolled environment
safe distance is calculated to be 20.4' away from the antenna.Average Power at Antenna (watts): 1500W
Antenna Gain (dBi):12
Operating Frequency (Mhz):3.8
Include Effects of Ground Reflections - Yes
Calculate
Results for a controlled environment:
Maximum Allowed Power Density (mw/cm2): 62.3269
Minimum Safe Distance (feet): 9.1455'
For an uncontrolled environment:
Maximum Allowed Power Density (mw/cm2):12.4654
Minimum Safe Distance (feet): 20.4500' SAFEAll finished and put to bed. Like the feeling you get after finishing your taxes...
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