[TowerTalk] RF Safety Worksheet

[David O. Hachadorian]

Here is a little worksheet that I made for RF Safety
Evaluation. It may look strange on your email
reader because of the longish line length, but save it
to a file, and then you can edit it. It contains sample
data that you can overwrite with your own data.

I Just filled out one of these for every band/antenna and
used the data as input to the University of Texas
Internet RF Safety Calculator. I printed the worksheet and the
UTex output sheet for each band/antenna, put them
in a binder, and the evaluation is done.

Use this worksheet at your own risk. If anyone spots something
wrong in this worksheet or method, please let me know.

Dave Hachadorian, K6LL
K6LL@juno.com
Yuma, AZ





	A. Callsign: AA7AAA

	B. Frequency, MHz: 21.45
	
	C. Maximum PEP transmitter output, watts: 1500

	D. Type of feedline: RG-213

	E. Length of feedline, feet: 80

	F. Feedline loss, negative dB:  -.8

	G. Line F divided by 10. (It will be a negative number).  -.08

	H. PEP power delivered to the antenna: line C antilog line G 
		1500 ALOG -.08 = 1248
	
	I. Worst case (highest) Emission mode duty factor: .4
		FSK, RTTY, AFSK SSB, FM Voice: 1.0
		Conversational SSB, heavy speech processing: 0.5
		Conversational CW: 0.4
		Conversational SSB, no speech processing: 0.2

	J. Transmit/Receive duty cycle over six minutes: .5
		Longest conceivable percent transmit time in six minutes,
		expressed as a decimal.

	K. Transmit/Receive duty cycle over 30 minutes: .5
		Longest conceivable percent transmit time in thirty
minutes,
		expressed as a decimal.
 
	L. AVERAGE power to antenna, controlled case: H x I x J = 250

	M. AVERAGE power to antenna, uncontrolled case: H x I x K = 250

	N. Antenna Gain, dBi: 9.5

	O. Closest CONTROLLED human proximity to antenna, feet: 46

	P. Closest UNCONTROLLED human proximity to antenna, feet: 51


	Proceed to the University of Texas World Wide Web Site:
	http://www.cs.texas.edu/users/kharker/rfsafety

	Input items L, N, O, B (controlled case). Print the output sheet.
	Input items M, N, P, B (uncontrolled case). Print the output
sheet 

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